54 files changed, 4401 insertions, 0 deletions
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/ASNObject.php b/vendor/fgrosse/phpasn1/lib/ASN1/ASNObject.php
new file mode 100644
index 0000000..3b7f162
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/ASNObject.php
@@ -0,0 +1,355 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\Universal\BitString;
+use FG\ASN1\Universal\Boolean;
+use FG\ASN1\Universal\Enumerated;
+use FG\ASN1\Universal\GeneralizedTime;
+use FG\ASN1\Universal\Integer;
+use FG\ASN1\Universal\NullObject;
+use FG\ASN1\Universal\ObjectIdentifier;
+use FG\ASN1\Universal\RelativeObjectIdentifier;
+use FG\ASN1\Universal\OctetString;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\Set;
+use FG\ASN1\Universal\UTCTime;
+use FG\ASN1\Universal\IA5String;
+use FG\ASN1\Universal\PrintableString;
+use FG\ASN1\Universal\NumericString;
+use FG\ASN1\Universal\UTF8String;
+use FG\ASN1\Universal\UniversalString;
+use FG\ASN1\Universal\CharacterString;
+use FG\ASN1\Universal\GeneralString;
+use FG\ASN1\Universal\VisibleString;
+use FG\ASN1\Universal\GraphicString;
+use FG\ASN1\Universal\BMPString;
+use FG\ASN1\Universal\T61String;
+use FG\ASN1\Universal\ObjectDescriptor;
+use FG\Utility\BigInteger;
+use LogicException;
+
+/**
+ * Class ASNObject is the base class for all concrete ASN.1 objects.
+ */
+abstract class ASNObject implements Parsable
+{
+    private $contentLength;
+    private $nrOfLengthOctets;
+
+    /**
+     * Must return the number of octets of the content part.
+     *
+     * @return int
+     */
+    abstract protected function calculateContentLength();
+
+    /**
+     * Encode the object using DER encoding.
+     *
+     * @see http://en.wikipedia.org/wiki/X.690#DER_encoding
+     *
+     * @return string the binary representation of an objects value
+     */
+    abstract protected function getEncodedValue();
+
+    /**
+     * Return the content of this object in a non encoded form.
+     * This can be used to print the value in human readable form.
+     *
+     * @return mixed
+     */
+    abstract public function getContent();
+
+    /**
+     * Return the object type octet.
+     * This should use the class constants of Identifier.
+     *
+     * @see Identifier
+     *
+     * @return int
+     */
+    abstract public function getType();
+
+    /**
+     * Returns all identifier octets. If an inheriting class models a tag with
+     * the long form identifier format, it MUST reimplement this method to
+     * return all octets of the identifier.
+     *
+     * @throws LogicException If the identifier format is long form
+     *
+     * @return string Identifier as a set of octets
+     */
+    public function getIdentifier()
+    {
+        $firstOctet = $this->getType();
+
+        if (Identifier::isLongForm($firstOctet)) {
+            throw new LogicException(sprintf('Identifier of %s uses the long form and must therefor override "ASNObject::getIdentifier()".', get_class($this)));
+        }
+
+        return chr($firstOctet);
+    }
+
+    /**
+     * Encode this object using DER encoding.
+     *
+     * @return string the full binary representation of the complete object
+     */
+    public function getBinary()
+    {
+        $result  = $this->getIdentifier();
+        $result .= $this->createLengthPart();
+        $result .= $this->getEncodedValue();
+
+        return $result;
+    }
+
+    private function createLengthPart()
+    {
+        $contentLength = $this->getContentLength();
+        $nrOfLengthOctets = $this->getNumberOfLengthOctets($contentLength);
+
+        if ($nrOfLengthOctets == 1) {
+            return chr($contentLength);
+        } else {
+            // the first length octet determines the number subsequent length octets
+            $lengthOctets = chr(0x80 | ($nrOfLengthOctets - 1));
+            for ($shiftLength = 8 * ($nrOfLengthOctets - 2); $shiftLength >= 0; $shiftLength -= 8) {
+                $lengthOctets .= chr($contentLength >> $shiftLength);
+            }
+
+            return $lengthOctets;
+        }
+    }
+
+    protected function getNumberOfLengthOctets($contentLength = null)
+    {
+        if (!isset($this->nrOfLengthOctets)) {
+            if ($contentLength == null) {
+                $contentLength = $this->getContentLength();
+            }
+
+            $this->nrOfLengthOctets = 1;
+            if ($contentLength > 127) {
+                do { // long form
+                    $this->nrOfLengthOctets++;
+                    $contentLength = $contentLength >> 8;
+                } while ($contentLength > 0);
+            }
+        }
+
+        return $this->nrOfLengthOctets;
+    }
+
+    protected function getContentLength()
+    {
+        if (!isset($this->contentLength)) {
+            $this->contentLength = $this->calculateContentLength();
+        }
+
+        return $this->contentLength;
+    }
+
+    protected function setContentLength($newContentLength)
+    {
+        $this->contentLength = $newContentLength;
+        $this->getNumberOfLengthOctets($newContentLength);
+    }
+
+    /**
+     * Returns the length of the whole object (including the identifier and length octets).
+     */
+    public function getObjectLength()
+    {
+        $nrOfIdentifierOctets = strlen($this->getIdentifier());
+        $contentLength = $this->getContentLength();
+        $nrOfLengthOctets = $this->getNumberOfLengthOctets($contentLength);
+
+        return $nrOfIdentifierOctets + $nrOfLengthOctets + $contentLength;
+    }
+
+    public function __toString()
+    {
+        return $this->getContent();
+    }
+
+    /**
+     * Returns the name of the ASN.1 Type of this object.
+     *
+     * @see Identifier::getName()
+     */
+    public function getTypeName()
+    {
+        return Identifier::getName($this->getType());
+    }
+
+    /**
+     * @param string $binaryData
+     * @param int $offsetIndex
+     *
+     * @throws ParserException
+     *
+     * @return \FG\ASN1\ASNObject
+     */
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        if (strlen($binaryData) <= $offsetIndex) {
+            throw new ParserException('Can not parse binary from data: Offset index larger than input size', $offsetIndex);
+        }
+
+        $identifierOctet = ord($binaryData[$offsetIndex]);
+        if (Identifier::isContextSpecificClass($identifierOctet) && Identifier::isConstructed($identifierOctet)) {
+            return ExplicitlyTaggedObject::fromBinary($binaryData, $offsetIndex);
+        }
+
+        switch ($identifierOctet) {
+            case Identifier::BITSTRING:
+                return BitString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::BOOLEAN:
+                return Boolean::fromBinary($binaryData, $offsetIndex);
+            case Identifier::ENUMERATED:
+                return Enumerated::fromBinary($binaryData, $offsetIndex);
+            case Identifier::INTEGER:
+                return Integer::fromBinary($binaryData, $offsetIndex);
+            case Identifier::NULL:
+                return NullObject::fromBinary($binaryData, $offsetIndex);
+            case Identifier::OBJECT_IDENTIFIER:
+                return ObjectIdentifier::fromBinary($binaryData, $offsetIndex);
+            case Identifier::RELATIVE_OID:
+                return RelativeObjectIdentifier::fromBinary($binaryData, $offsetIndex);
+            case Identifier::OCTETSTRING:
+                return OctetString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::SEQUENCE:
+                return Sequence::fromBinary($binaryData, $offsetIndex);
+            case Identifier::SET:
+                return Set::fromBinary($binaryData, $offsetIndex);
+            case Identifier::UTC_TIME:
+                return UTCTime::fromBinary($binaryData, $offsetIndex);
+            case Identifier::GENERALIZED_TIME:
+                return GeneralizedTime::fromBinary($binaryData, $offsetIndex);
+            case Identifier::IA5_STRING:
+                return IA5String::fromBinary($binaryData, $offsetIndex);
+            case Identifier::PRINTABLE_STRING:
+                return PrintableString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::NUMERIC_STRING:
+                return NumericString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::UTF8_STRING:
+                return UTF8String::fromBinary($binaryData, $offsetIndex);
+            case Identifier::UNIVERSAL_STRING:
+                return UniversalString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::CHARACTER_STRING:
+                return CharacterString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::GENERAL_STRING:
+                return GeneralString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::VISIBLE_STRING:
+                return VisibleString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::GRAPHIC_STRING:
+                return GraphicString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::BMP_STRING:
+                return BMPString::fromBinary($binaryData, $offsetIndex);
+            case Identifier::T61_STRING:
+                return T61String::fromBinary($binaryData, $offsetIndex);
+            case Identifier::OBJECT_DESCRIPTOR:
+                return ObjectDescriptor::fromBinary($binaryData, $offsetIndex);
+            default:
+                // At this point the identifier may be >1 byte.
+                if (Identifier::isConstructed($identifierOctet)) {
+                    return new UnknownConstructedObject($binaryData, $offsetIndex);
+                } else {
+                    $identifier = self::parseBinaryIdentifier($binaryData, $offsetIndex);
+                    $lengthOfUnknownObject = self::parseContentLength($binaryData, $offsetIndex);
+                    $offsetIndex += $lengthOfUnknownObject;
+
+                    return new UnknownObject($identifier, $lengthOfUnknownObject);
+                }
+        }
+    }
+
+    protected static function parseIdentifier($identifierOctet, $expectedIdentifier, $offsetForExceptionHandling)
+    {
+        if (is_string($identifierOctet) || is_numeric($identifierOctet) == false) {
+            $identifierOctet = ord($identifierOctet);
+        }
+
+        if ($identifierOctet != $expectedIdentifier) {
+            $message = 'Can not create an '.Identifier::getName($expectedIdentifier).' from an '.Identifier::getName($identifierOctet);
+            throw new ParserException($message, $offsetForExceptionHandling);
+        }
+    }
+
+    protected static function parseBinaryIdentifier($binaryData, &$offsetIndex)
+    {
+        if (strlen($binaryData) <= $offsetIndex) {
+            throw new ParserException('Can not parse identifier from data: Offset index larger than input size', $offsetIndex);
+        }
+
+        $identifier = $binaryData[$offsetIndex++];
+
+        if (Identifier::isLongForm(ord($identifier)) == false) {
+            return $identifier;
+        }
+
+        while (true) {
+            if (strlen($binaryData) <= $offsetIndex) {
+                throw new ParserException('Can not parse identifier (long form) from data: Offset index larger than input size', $offsetIndex);
+            }
+            $nextOctet = $binaryData[$offsetIndex++];
+            $identifier .= $nextOctet;
+
+            if ((ord($nextOctet) & 0x80) === 0) {
+                // the most significant bit is 0 to we have reached the end of the identifier
+                break;
+            }
+        }
+
+        return $identifier;
+    }
+
+    protected static function parseContentLength(&$binaryData, &$offsetIndex, $minimumLength = 0)
+    {
+        if (strlen($binaryData) <= $offsetIndex) {
+            throw new ParserException('Can not parse content length from data: Offset index larger than input size', $offsetIndex);
+        }
+
+        $contentLength = ord($binaryData[$offsetIndex++]);
+        if (($contentLength & 0x80) != 0) {
+            // bit 8 is set -> this is the long form
+            $nrOfLengthOctets = $contentLength & 0x7F;
+            $contentLength = BigInteger::create(0x00);
+            for ($i = 0; $i < $nrOfLengthOctets; $i++) {
+                if (strlen($binaryData) <= $offsetIndex) {
+                    throw new ParserException('Can not parse content length (long form) from data: Offset index larger than input size', $offsetIndex);
+                }
+                $contentLength = $contentLength->shiftLeft(8)->add(ord($binaryData[$offsetIndex++]));
+            }
+
+            if ($contentLength->compare(PHP_INT_MAX) > 0) {
+                throw new ParserException("Can not parse content length from data: length > maximum integer", $offsetIndex);
+            }
+
+            $contentLength = $contentLength->toInteger();
+        }
+
+        if ($contentLength < $minimumLength) {
+            throw new ParserException('A '.get_called_class()." should have a content length of at least {$minimumLength}. Extracted length was {$contentLength}", $offsetIndex);
+        }
+
+        $lenDataRemaining = strlen($binaryData) - $offsetIndex;
+
+        if ($lenDataRemaining < $contentLength) {
+            throw new ParserException("Content length {$contentLength} exceeds remaining data length {$lenDataRemaining}", $offsetIndex);
+        }
+
+        return $contentLength;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/AbstractString.php b/vendor/fgrosse/phpasn1/lib/ASN1/AbstractString.php
new file mode 100644
index 0000000..7e0d7dd
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/AbstractString.php
@@ -0,0 +1,136 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use Exception;
+
+abstract class AbstractString extends ASNObject implements Parsable
+{
+    /** @var string */
+    protected $value;
+    private $checkStringForIllegalChars = true;
+    private $allowedCharacters = [];
+
+    /**
+     * The abstract base class for ASN.1 classes which represent some string of character.
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+    }
+
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    protected function allowCharacter($character)
+    {
+        $this->allowedCharacters[] = $character;
+    }
+
+    protected function allowCharacters(...$characters)
+    {
+        foreach ($characters as $character) {
+            $this->allowedCharacters[] = $character;
+        }
+    }
+
+    protected function allowNumbers()
+    {
+        foreach (range('0', '9') as $char) {
+            $this->allowedCharacters[] = (string) $char;
+        }
+    }
+
+    protected function allowAllLetters()
+    {
+        $this->allowSmallLetters();
+        $this->allowCapitalLetters();
+    }
+
+    protected function allowSmallLetters()
+    {
+        foreach (range('a', 'z') as $char) {
+            $this->allowedCharacters[] = $char;
+        }
+    }
+
+    protected function allowCapitalLetters()
+    {
+        foreach (range('A', 'Z') as $char) {
+            $this->allowedCharacters[] = $char;
+        }
+    }
+
+    protected function allowSpaces()
+    {
+        $this->allowedCharacters[] = ' ';
+    }
+
+    protected function allowAll()
+    {
+        $this->checkStringForIllegalChars = false;
+    }
+
+    protected function calculateContentLength()
+    {
+        return strlen($this->value);
+    }
+
+    protected function getEncodedValue()
+    {
+        if ($this->checkStringForIllegalChars) {
+            $this->checkString();
+        }
+
+        return $this->value;
+    }
+
+    protected function checkString()
+    {
+        $stringLength = $this->getContentLength();
+        for ($i = 0; $i < $stringLength; $i++) {
+            if (in_array($this->value[$i], $this->allowedCharacters) == false) {
+                $typeName = Identifier::getName($this->getType());
+                throw new Exception("Could not create a {$typeName} from the character sequence '{$this->value}'.");
+            }
+        }
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        $parsedObject = new static('');
+
+        self::parseIdentifier($binaryData[$offsetIndex], $parsedObject->getType(), $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+        $string = substr($binaryData, $offsetIndex, $contentLength);
+        $offsetIndex += $contentLength;
+
+        $parsedObject->value = $string;
+        $parsedObject->setContentLength($contentLength);
+        return $parsedObject;
+    }
+
+    public static function isValid($string)
+    {
+        $testObject = new static($string);
+        try {
+            $testObject->checkString();
+
+            return true;
+        } catch (Exception $exception) {
+            return false;
+        }
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/AbstractTime.php b/vendor/fgrosse/phpasn1/lib/ASN1/AbstractTime.php
new file mode 100644
index 0000000..9fad505
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/AbstractTime.php
@@ -0,0 +1,78 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use DateInterval;
+use DateTime;
+use DateTimeZone;
+use Exception;
+
+abstract class AbstractTime extends ASNObject
+{
+    /** @var DateTime */
+    protected $value;
+
+    public function __construct($dateTime = null, $dateTimeZone = 'UTC')
+    {
+        if ($dateTime == null || is_string($dateTime)) {
+            $timeZone = new DateTimeZone($dateTimeZone);
+            $dateTimeObject = new DateTime($dateTime, $timeZone);
+            if ($dateTimeObject == false) {
+                $errorMessage = $this->getLastDateTimeErrors();
+                $className = Identifier::getName($this->getType());
+                throw new Exception(sprintf("Could not create %s from date time string '%s': %s", $className, $dateTime, $errorMessage));
+            }
+            $dateTime = $dateTimeObject;
+        } elseif (!$dateTime instanceof DateTime) {
+            throw new Exception('Invalid first argument for some instance of AbstractTime constructor');
+        }
+
+        $this->value = $dateTime;
+    }
+
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    protected function getLastDateTimeErrors()
+    {
+        $messages = '';
+        $lastErrors = DateTime::getLastErrors();
+        foreach ($lastErrors['errors'] as $errorMessage) {
+            $messages .= "{$errorMessage}, ";
+        }
+
+        return substr($messages, 0, -2);
+    }
+
+    public function __toString()
+    {
+        return $this->value->format("Y-m-d\tH:i:s");
+    }
+
+    protected static function extractTimeZoneData(&$binaryData, &$offsetIndex, DateTime $dateTime)
+    {
+        $sign = $binaryData[$offsetIndex++];
+        $timeOffsetHours   = intval(substr($binaryData, $offsetIndex, 2));
+        $timeOffsetMinutes = intval(substr($binaryData, $offsetIndex + 2, 2));
+        $offsetIndex += 4;
+
+        $interval = new DateInterval("PT{$timeOffsetHours}H{$timeOffsetMinutes}M");
+        if ($sign == '+') {
+            $dateTime->sub($interval);
+        } else {
+            $dateTime->add($interval);
+        }
+
+        return $dateTime;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Base128.php b/vendor/fgrosse/phpasn1/lib/ASN1/Base128.php
new file mode 100644
index 0000000..119ee7b
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Base128.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace FG\ASN1;
+
+use FG\Utility\BigInteger;
+use InvalidArgumentException;
+
+/**
+ * A base-128 decoder.
+ */
+class Base128
+{
+    /**
+     * @param int $value
+     *
+     * @return string
+     */
+    public static function encode($value)
+    {
+        $value = BigInteger::create($value);
+        $octets = chr($value->modulus(0x80)->toInteger());
+
+        $value = $value->shiftRight(7);
+        while ($value->compare(0) > 0) {
+            $octets .= chr(0x80 | $value->modulus(0x80)->toInteger());
+            $value = $value->shiftRight(7);
+        }
+
+        return strrev($octets);
+    }
+
+    /**
+     * @param string $octets
+     *
+     * @throws InvalidArgumentException if the given octets represent a malformed base-128 value or the decoded value would exceed the the maximum integer length
+     *
+     * @return int
+     */
+    public static function decode($octets)
+    {
+        $bitsPerOctet = 7;
+        $value = BigInteger::create(0);
+        $i = 0;
+
+        while (true) {
+            if (!isset($octets[$i])) {
+                throw new InvalidArgumentException(sprintf('Malformed base-128 encoded value (0x%s).', strtoupper(bin2hex($octets)) ?: '0'));
+            }
+
+            $octet = ord($octets[$i++]);
+
+            $l1 = $value->shiftLeft($bitsPerOctet);
+            $r1 = $octet & 0x7f;
+            $value = $l1->add($r1);
+
+            if (0 === ($octet & 0x80)) {
+                break;
+            }
+        }
+
+        return (string)$value;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Composite/AttributeTypeAndValue.php b/vendor/fgrosse/phpasn1/lib/ASN1/Composite/AttributeTypeAndValue.php
new file mode 100644
index 0000000..3f4027c
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Composite/AttributeTypeAndValue.php
@@ -0,0 +1,35 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Composite;
+
+use FG\ASN1\ASNObject;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\ObjectIdentifier;
+
+class AttributeTypeAndValue extends Sequence
+{
+    /**
+     * @param ObjectIdentifier|string $objIdentifier
+     * @param \FG\ASN1\ASNObject $value
+     */
+    public function __construct($objIdentifier, ASNObject $value)
+    {
+        if ($objIdentifier instanceof ObjectIdentifier == false) {
+            $objIdentifier = new ObjectIdentifier($objIdentifier);
+        }
+        parent::__construct($objIdentifier, $value);
+    }
+
+    public function __toString()
+    {
+        return $this->children[0].': '.$this->children[1];
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Composite/RDNString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Composite/RDNString.php
new file mode 100644
index 0000000..e95e7ac
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Composite/RDNString.php
@@ -0,0 +1,37 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Composite;
+
+use FG\ASN1\Universal\PrintableString;
+use FG\ASN1\Universal\IA5String;
+use FG\ASN1\Universal\UTF8String;
+
+class RDNString extends RelativeDistinguishedName
+{
+    /**
+     * @param string|\FG\ASN1\Universal\ObjectIdentifier $objectIdentifierString
+     * @param string|\FG\ASN1\ASNObject $value
+     */
+    public function __construct($objectIdentifierString, $value)
+    {
+        if (PrintableString::isValid($value)) {
+            $value = new PrintableString($value);
+        } else {
+            if (IA5String::isValid($value)) {
+                $value = new IA5String($value);
+            } else {
+                $value = new UTF8String($value);
+            }
+        }
+
+        parent::__construct($objectIdentifierString, $value);
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Composite/RelativeDistinguishedName.php b/vendor/fgrosse/phpasn1/lib/ASN1/Composite/RelativeDistinguishedName.php
new file mode 100644
index 0000000..4185f41
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Composite/RelativeDistinguishedName.php
@@ -0,0 +1,50 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Composite;
+
+use FG\ASN1\Exception\NotImplementedException;
+use FG\ASN1\ASNObject;
+use FG\ASN1\Universal\Set;
+
+class RelativeDistinguishedName extends Set
+{
+    /**
+     * @param string|\FG\ASN1\Universal\ObjectIdentifier $objIdentifierString
+     * @param \FG\ASN1\ASNObject $value
+     */
+    public function __construct($objIdentifierString, ASNObject $value)
+    {
+        // TODO: This does only support one element in the RelativeDistinguishedName Set but it it is defined as follows:
+        // RelativeDistinguishedName ::= SET SIZE (1..MAX) OF AttributeTypeAndValue
+        parent::__construct(new AttributeTypeAndValue($objIdentifierString, $value));
+    }
+
+    public function getContent()
+    {
+        /** @var \FG\ASN1\ASNObject $firstObject */
+        $firstObject = $this->children[0];
+        return $firstObject->__toString();
+    }
+
+    /**
+     * At the current version this code can not work since the implementation of Construct requires
+     * the class to support a constructor without arguments.
+     *
+     * @deprecated this function is not yet implemented! Feel free to submit a pull request on github
+     * @param string $binaryData
+     * @param int $offsetIndex
+     * @throws NotImplementedException
+     */
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        throw new NotImplementedException();
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Construct.php b/vendor/fgrosse/phpasn1/lib/ASN1/Construct.php
new file mode 100644
index 0000000..58f9613
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Construct.php
@@ -0,0 +1,191 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use ArrayAccess;
+use ArrayIterator;
+use Countable;
+use FG\ASN1\Exception\ParserException;
+use Iterator;
+
+abstract class Construct extends ASNObject implements Countable, ArrayAccess, Iterator, Parsable
+{
+    /** @var \FG\ASN1\ASNObject[] */
+    protected $children;
+    private $iteratorPosition;
+
+    /**
+     * @param \FG\ASN1\ASNObject[] $children the variadic type hint is commented due to https://github.com/facebook/hhvm/issues/4858
+     */
+    public function __construct(/* HH_FIXME[4858]: variadic + strict */ ...$children)
+    {
+        $this->children = $children;
+        $this->iteratorPosition = 0;
+    }
+
+    public function getContent()
+    {
+        return $this->children;
+    }
+
+    public function rewind()
+    {
+        $this->iteratorPosition = 0;
+    }
+
+    public function current()
+    {
+        return $this->children[$this->iteratorPosition];
+    }
+
+    public function key()
+    {
+        return $this->iteratorPosition;
+    }
+
+    public function next()
+    {
+        $this->iteratorPosition++;
+    }
+
+    public function valid()
+    {
+        return isset($this->children[$this->iteratorPosition]);
+    }
+
+    public function offsetExists($offset)
+    {
+        return array_key_exists($offset, $this->children);
+    }
+
+    public function offsetGet($offset)
+    {
+        return $this->children[$offset];
+    }
+
+    public function offsetSet($offset, $value)
+    {
+        if ($offset === null) {
+            $offset = count($this->children);
+        }
+
+        $this->children[$offset] = $value;
+    }
+
+    public function offsetUnset($offset)
+    {
+        unset($this->children[$offset]);
+    }
+
+    protected function calculateContentLength()
+    {
+        $length = 0;
+        foreach ($this->children as $component) {
+            $length += $component->getObjectLength();
+        }
+
+        return $length;
+    }
+
+    protected function getEncodedValue()
+    {
+        $result = '';
+        foreach ($this->children as $component) {
+            $result .= $component->getBinary();
+        }
+
+        return $result;
+    }
+
+    public function addChild(ASNObject $child)
+    {
+        $this->children[] = $child;
+    }
+
+    public function addChildren(array $children)
+    {
+        foreach ($children as $child) {
+            $this->addChild($child);
+        }
+    }
+
+    public function __toString()
+    {
+        $nrOfChildren = $this->getNumberOfChildren();
+        $childString = $nrOfChildren == 1 ? 'child' : 'children';
+
+        return "[{$nrOfChildren} {$childString}]";
+    }
+
+    public function getNumberOfChildren()
+    {
+        return count($this->children);
+    }
+
+    /**
+     * @return \FG\ASN1\ASNObject[]
+     */
+    public function getChildren()
+    {
+        return $this->children;
+    }
+
+    /**
+     * @return \FG\ASN1\ASNObject
+     */
+    public function getFirstChild()
+    {
+        return $this->children[0];
+    }
+
+    /**
+     * @param string $binaryData
+     * @param int $offsetIndex
+     *
+     * @throws Exception\ParserException
+     *
+     * @return Construct|static
+     */
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        $parsedObject = new static();
+        self::parseIdentifier($binaryData[$offsetIndex], $parsedObject->getType(), $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+        $startIndex = $offsetIndex;
+
+        $children = [];
+        $octetsToRead = $contentLength;
+        while ($octetsToRead > 0) {
+            $newChild = ASNObject::fromBinary($binaryData, $offsetIndex);
+            $octetsToRead -= $newChild->getObjectLength();
+            $children[] = $newChild;
+        }
+
+        if ($octetsToRead !== 0) {
+            throw new ParserException("Sequence length incorrect", $startIndex);
+        }
+
+        $parsedObject->addChildren($children);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+
+    public function count($mode = COUNT_NORMAL)
+    {
+        return count($this->children, $mode);
+    }
+
+    public function getIterator()
+    {
+        return new ArrayIterator($this->children);
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Exception/NotImplementedException.php b/vendor/fgrosse/phpasn1/lib/ASN1/Exception/NotImplementedException.php
new file mode 100644
index 0000000..c9f8e82
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Exception/NotImplementedException.php
@@ -0,0 +1,15 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Exception;
+
+class NotImplementedException extends \Exception
+{
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Exception/ParserException.php b/vendor/fgrosse/phpasn1/lib/ASN1/Exception/ParserException.php
new file mode 100644
index 0000000..4bda4e8
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Exception/ParserException.php
@@ -0,0 +1,29 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Exception;
+
+class ParserException extends \Exception
+{
+    private $errorMessage;
+    private $offset;
+
+    public function __construct($errorMessage, $offset)
+    {
+        $this->errorMessage = $errorMessage;
+        $this->offset = $offset;
+        parent::__construct("ASN.1 Parser Exception at offset {$this->offset}: {$this->errorMessage}");
+    }
+
+    public function getOffset()
+    {
+        return $this->offset;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/ExplicitlyTaggedObject.php b/vendor/fgrosse/phpasn1/lib/ASN1/ExplicitlyTaggedObject.php
new file mode 100644
index 0000000..b947a95
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/ExplicitlyTaggedObject.php
@@ -0,0 +1,131 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use FG\ASN1\Exception\ParserException;
+
+/**
+ * Class ExplicitlyTaggedObject decorate an inner object with an additional tag that gives information about
+ * its context specific meaning.
+ *
+ * Explanation taken from A Layman's Guide to a Subset of ASN.1, BER, and DER:
+ * >>> An RSA Laboratories Technical Note
+ * >>> Burton S. Kaliski Jr.
+ * >>> Revised November 1, 1993
+ *
+ * [...]
+ * Explicitly tagged types are derived from other types by adding an outer tag to the underlying type.
+ * In effect, explicitly tagged types are structured types consisting of one component, the underlying type.
+ * Explicit tagging is denoted by the ASN.1 keywords [class number] EXPLICIT (see Section 5.2).
+ * [...]
+ *
+ * @see http://luca.ntop.org/Teaching/Appunti/asn1.html
+ */
+class ExplicitlyTaggedObject extends ASNObject
+{
+    /** @var \FG\ASN1\ASNObject[] */
+    private $decoratedObjects;
+    private $tag;
+
+    /**
+     * @param int $tag
+     * @param \FG\ASN1\ASNObject $objects,...
+     */
+    public function __construct($tag, /* HH_FIXME[4858]: variadic + strict */ ...$objects)
+    {
+        $this->tag = $tag;
+        $this->decoratedObjects = $objects;
+    }
+
+    protected function calculateContentLength()
+    {
+        $length = 0;
+        foreach ($this->decoratedObjects as $object) {
+            $length += $object->getObjectLength();
+        }
+
+        return $length;
+    }
+
+    protected function getEncodedValue()
+    {
+        $encoded = '';
+        foreach ($this->decoratedObjects as $object) {
+            $encoded .= $object->getBinary();
+        }
+
+        return $encoded;
+    }
+
+    public function getContent()
+    {
+        return $this->decoratedObjects;
+    }
+
+    public function __toString()
+    {
+        switch ($length = count($this->decoratedObjects)) {
+        case 0:
+            return "Context specific empty object with tag [{$this->tag}]";
+        case 1:
+            $decoratedType = Identifier::getShortName($this->decoratedObjects[0]->getType());
+            return "Context specific $decoratedType with tag [{$this->tag}]";
+        default:
+            return "$length context specific objects with tag [{$this->tag}]";
+        }
+    }
+
+    public function getType()
+    {
+        return ord($this->getIdentifier());
+    }
+
+    public function getIdentifier()
+    {
+        $identifier = Identifier::create(Identifier::CLASS_CONTEXT_SPECIFIC, true, $this->tag);
+
+        return is_int($identifier) ? chr($identifier) : $identifier;
+    }
+
+    public function getTag()
+    {
+        return $this->tag;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        $identifier = self::parseBinaryIdentifier($binaryData, $offsetIndex);
+        $firstIdentifierOctet = ord($identifier);
+        assert(Identifier::isContextSpecificClass($firstIdentifierOctet), 'identifier octet should indicate context specific class');
+        assert(Identifier::isConstructed($firstIdentifierOctet), 'identifier octet should indicate constructed object');
+        $tag = Identifier::getTagNumber($identifier);
+
+        $totalContentLength = self::parseContentLength($binaryData, $offsetIndex);
+        $remainingContentLength = $totalContentLength;
+
+        $offsetIndexOfDecoratedObject = $offsetIndex;
+        $decoratedObjects = [];
+
+        while ($remainingContentLength > 0) {
+            $nextObject = ASNObject::fromBinary($binaryData, $offsetIndex);
+            $remainingContentLength -= $nextObject->getObjectLength();
+            $decoratedObjects[] = $nextObject;
+        }
+
+        if ($remainingContentLength != 0) {
+            throw new ParserException("Context-Specific explicitly tagged object [$tag] starting at offset $offsetIndexOfDecoratedObject specifies a length of $totalContentLength octets but $remainingContentLength remain after parsing the content", $offsetIndexOfDecoratedObject);
+        }
+
+        $parsedObject = new self($tag, ...$decoratedObjects);
+        $parsedObject->setContentLength($totalContentLength);
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Identifier.php b/vendor/fgrosse/phpasn1/lib/ASN1/Identifier.php
new file mode 100644
index 0000000..b21caa3
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Identifier.php
@@ -0,0 +1,339 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use Exception;
+
+/**
+ * The Identifier encodes the ASN.1 tag (class and number) of the type of a data value.
+ *
+ * Every identifier whose number is in the range 0 to 30 has the following structure:
+ *
+ * Bits:    8  7    6    5  4  3  2  1
+ *       | Class | P/C |   Tag number  |
+ *       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * Bits 8 and 7 define the class of this type ( Universal, Application, Context-specific or Private).
+ * Bit 6 encoded whether this type is primitive or constructed
+ * The remaining bits 5 - 1 encode the tag number
+ */
+class Identifier
+{
+    const CLASS_UNIVERSAL        = 0x00;
+    const CLASS_APPLICATION      = 0x01;
+    const CLASS_CONTEXT_SPECIFIC = 0x02;
+    const CLASS_PRIVATE          = 0x03;
+
+    const EOC               = 0x00; // unsupported for now
+    const BOOLEAN           = 0x01;
+    const INTEGER           = 0x02;
+    const BITSTRING         = 0x03;
+    const OCTETSTRING       = 0x04;
+    const NULL              = 0x05;
+    const OBJECT_IDENTIFIER = 0x06;
+    const OBJECT_DESCRIPTOR = 0x07;
+    const EXTERNAL          = 0x08; // unsupported for now
+    const REAL              = 0x09; // unsupported for now
+    const ENUMERATED        = 0x0A;
+    const EMBEDDED_PDV      = 0x0B; // unsupported for now
+    const UTF8_STRING       = 0x0C;
+    const RELATIVE_OID      = 0x0D;
+    // value 0x0E and 0x0F are reserved for future use
+
+    const SEQUENCE          = 0x30;
+    const SET               = 0x31;
+    const NUMERIC_STRING    = 0x12;
+    const PRINTABLE_STRING  = 0x13;
+    const T61_STRING        = 0x14; // sometimes referred to as TeletextString
+    const VIDEOTEXT_STRING  = 0x15;
+    const IA5_STRING        = 0x16;
+    const UTC_TIME          = 0x17;
+    const GENERALIZED_TIME  = 0x18;
+    const GRAPHIC_STRING    = 0x19;
+    const VISIBLE_STRING    = 0x1A;
+    const GENERAL_STRING    = 0x1B;
+    const UNIVERSAL_STRING  = 0x1C;
+    const CHARACTER_STRING  = 0x1D; // Unrestricted character type
+    const BMP_STRING        = 0x1E;
+
+    const LONG_FORM         = 0x1F;
+    const IS_CONSTRUCTED    = 0x20;
+
+    /**
+     * Creates an identifier. Short form identifiers are returned as integers
+     * for BC, long form identifiers will be returned as a string of octets.
+     *
+     * @param int $class
+     * @param bool $isConstructed
+     * @param int $tagNumber
+     *
+     * @throws Exception if the given arguments are invalid
+     *
+     * @return int|string
+     */
+    public static function create($class, $isConstructed, $tagNumber)
+    {
+        if (!is_numeric($class) || $class < self::CLASS_UNIVERSAL || $class > self::CLASS_PRIVATE) {
+            throw new Exception(sprintf('Invalid class %d given', $class));
+        }
+
+        if (!is_bool($isConstructed)) {
+            throw new Exception("\$isConstructed must be a boolean value ($isConstructed given)");
+        }
+
+        $tagNumber = self::makeNumeric($tagNumber);
+        if ($tagNumber < 0) {
+            throw new Exception(sprintf('Invalid $tagNumber %d given. You can only use positive integers.', $tagNumber));
+        }
+
+        if ($tagNumber < self::LONG_FORM) {
+            return ($class << 6) | ($isConstructed << 5) | $tagNumber;
+        }
+
+        $firstOctet = ($class << 6) | ($isConstructed << 5) | self::LONG_FORM;
+
+        // Tag numbers formatted in long form are base-128 encoded. See X.609#8.1.2.4
+        return chr($firstOctet).Base128::encode($tagNumber);
+    }
+
+    public static function isConstructed($identifierOctet)
+    {
+        return ($identifierOctet & self::IS_CONSTRUCTED) === self::IS_CONSTRUCTED;
+    }
+
+    public static function isLongForm($identifierOctet)
+    {
+        return ($identifierOctet & self::LONG_FORM) === self::LONG_FORM;
+    }
+
+    /**
+     * Return the name of the mapped ASN.1 type with a preceding "ASN.1 ".
+     *
+     * Example: ASN.1 Octet String
+     *
+     * @see Identifier::getShortName()
+     *
+     * @param int|string $identifier
+     *
+     * @return string
+     */
+    public static function getName($identifier)
+    {
+        $identifierOctet = self::makeNumeric($identifier);
+
+        $typeName = static::getShortName($identifier);
+
+        if (($identifierOctet & self::LONG_FORM) < self::LONG_FORM) {
+            $typeName = "ASN.1 {$typeName}";
+        }
+
+        return $typeName;
+    }
+
+    /**
+     * Return the short version of the type name.
+     *
+     * If the given identifier octet can be mapped to a known universal type this will
+     * return its name. Else Identifier::getClassDescription() is used to retrieve
+     * information about the identifier.
+     *
+     * @see Identifier::getName()
+     * @see Identifier::getClassDescription()
+     *
+     * @param int|string $identifier
+     *
+     * @return string
+     */
+    public static function getShortName($identifier)
+    {
+        $identifierOctet = self::makeNumeric($identifier);
+
+        switch ($identifierOctet) {
+            case self::EOC:
+                return 'End-of-contents octet';
+            case self::BOOLEAN:
+                return 'Boolean';
+            case self::INTEGER:
+                return 'Integer';
+            case self::BITSTRING:
+                return 'Bit String';
+            case self::OCTETSTRING:
+                return 'Octet String';
+            case self::NULL:
+                return 'NULL';
+            case self::OBJECT_IDENTIFIER:
+                return 'Object Identifier';
+            case self::OBJECT_DESCRIPTOR:
+                return 'Object Descriptor';
+            case self::EXTERNAL:
+                return 'External Type';
+            case self::REAL:
+                return 'Real';
+            case self::ENUMERATED:
+                return 'Enumerated';
+            case self::EMBEDDED_PDV:
+                return 'Embedded PDV';
+            case self::UTF8_STRING:
+                return 'UTF8 String';
+            case self::RELATIVE_OID:
+                return 'Relative OID';
+            case self::SEQUENCE:
+                return 'Sequence';
+            case self::SET:
+                return 'Set';
+            case self::NUMERIC_STRING:
+                return 'Numeric String';
+            case self::PRINTABLE_STRING:
+                return 'Printable String';
+            case self::T61_STRING:
+                return 'T61 String';
+            case self::VIDEOTEXT_STRING:
+                return 'Videotext String';
+            case self::IA5_STRING:
+                return 'IA5 String';
+            case self::UTC_TIME:
+                return 'UTC Time';
+            case self::GENERALIZED_TIME:
+                return 'Generalized Time';
+            case self::GRAPHIC_STRING:
+                return 'Graphic String';
+            case self::VISIBLE_STRING:
+                return 'Visible String';
+            case self::GENERAL_STRING:
+                return 'General String';
+            case self::UNIVERSAL_STRING:
+                return 'Universal String';
+            case self::CHARACTER_STRING:
+                return 'Character String';
+            case self::BMP_STRING:
+                return 'BMP String';
+
+            case 0x0E:
+                return 'RESERVED (0x0E)';
+            case 0x0F:
+                return 'RESERVED (0x0F)';
+
+            case self::LONG_FORM:
+            default:
+                $classDescription = self::getClassDescription($identifier);
+
+                if (is_int($identifier)) {
+                    $identifier = chr($identifier);
+                }
+
+                return "$classDescription (0x".strtoupper(bin2hex($identifier)).')';
+        }
+    }
+
+    /**
+     * Returns a textual description of the information encoded in a given identifier octet.
+     *
+     * The first three (most significant) bytes are evaluated to determine if this is a
+     * constructed or primitive type and if it is either universal, application, context-specific or
+     * private.
+     *
+     * Example:
+     *     Constructed context-specific
+     *     Primitive universal
+     *
+     * @param int|string $identifier
+     *
+     * @return string
+     */
+    public static function getClassDescription($identifier)
+    {
+        $identifierOctet = self::makeNumeric($identifier);
+
+        if (self::isConstructed($identifierOctet)) {
+            $classDescription = 'Constructed ';
+        } else {
+            $classDescription = 'Primitive ';
+        }
+        $classBits = $identifierOctet >> 6;
+        switch ($classBits) {
+            case self::CLASS_UNIVERSAL:
+                $classDescription .= 'universal';
+                break;
+            case self::CLASS_APPLICATION:
+                $classDescription .= 'application';
+                break;
+            case self::CLASS_CONTEXT_SPECIFIC:
+                $tagNumber = self::getTagNumber($identifier);
+                $classDescription = "[$tagNumber] Context-specific";
+                break;
+            case self::CLASS_PRIVATE:
+                $classDescription .= 'private';
+                break;
+
+            default:
+                return "INVALID IDENTIFIER OCTET: {$identifierOctet}";
+        }
+
+        return $classDescription;
+    }
+
+    /**
+     * @param int|string $identifier
+     *
+     * @return int
+     */
+    public static function getTagNumber($identifier)
+    {
+        $firstOctet = self::makeNumeric($identifier);
+        $tagNumber = $firstOctet & self::LONG_FORM;
+
+        if ($tagNumber < self::LONG_FORM) {
+            return $tagNumber;
+        }
+
+        if (is_numeric($identifier)) {
+            $identifier = chr($identifier);
+        }
+        return Base128::decode(substr($identifier, 1));
+    }
+
+    public static function isUniversalClass($identifier)
+    {
+        $identifier = self::makeNumeric($identifier);
+
+        return $identifier >> 6 == self::CLASS_UNIVERSAL;
+    }
+
+    public static function isApplicationClass($identifier)
+    {
+        $identifier = self::makeNumeric($identifier);
+
+        return $identifier >> 6 == self::CLASS_APPLICATION;
+    }
+
+    public static function isContextSpecificClass($identifier)
+    {
+        $identifier = self::makeNumeric($identifier);
+
+        return $identifier >> 6 == self::CLASS_CONTEXT_SPECIFIC;
+    }
+
+    public static function isPrivateClass($identifier)
+    {
+        $identifier = self::makeNumeric($identifier);
+
+        return $identifier >> 6 == self::CLASS_PRIVATE;
+    }
+
+    private static function makeNumeric($identifierOctet)
+    {
+        if (!is_numeric($identifierOctet)) {
+            return ord($identifierOctet);
+        } else {
+            return $identifierOctet;
+        }
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/OID.php b/vendor/fgrosse/phpasn1/lib/ASN1/OID.php
new file mode 100644
index 0000000..d4875c7
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/OID.php
@@ -0,0 +1,199 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+class OID
+{
+    const RSA_ENCRYPTION                    = '1.2.840.113549.1.1.1';
+    const MD5_WITH_RSA_ENCRYPTION           = '1.2.840.113549.1.1.4';
+    const SHA1_WITH_RSA_SIGNATURE           = '1.2.840.113549.1.1.5';
+    const SHA256_WITH_RSA_SIGNATURE         = '1.2.840.113549.1.1.11';
+    const PKCS9_EMAIL                       = '1.2.840.113549.1.9.1';
+    const PKCS9_UNSTRUCTURED_NAME           = '1.2.840.113549.1.9.2';
+    const PKCS9_CONTENT_TYPE                = '1.2.840.113549.1.9.3';
+    const PKCS9_MESSAGE_DIGEST              = '1.2.840.113549.1.9.4';
+    const PKCS9_SIGNING_TIME                = '1.2.840.113549.1.9.5';
+    const PKCS9_EXTENSION_REQUEST           = '1.2.840.113549.1.9.14';
+
+    // certificate extension identifier
+    const CERT_EXT_SUBJECT_DIRECTORY_ATTR   = '2.5.29.9';
+    const CERT_EXT_SUBJECT_KEY_IDENTIFIER   = '2.5.29.14';
+    const CERT_EXT_KEY_USAGE                = '2.5.29.15';
+    const CERT_EXT_PRIVATE_KEY_USAGE_PERIOD = '2.5.29.16';
+    const CERT_EXT_SUBJECT_ALT_NAME         = '2.5.29.17';
+    const CERT_EXT_ISSUER_ALT_NAME          = '2.5.29.18';
+    const CERT_EXT_BASIC_CONSTRAINTS        = '2.5.29.19';
+    const CERT_EXT_CRL_NUMBER               = '2.5.29.20';
+    const CERT_EXT_REASON_CODE              = '2.5.29.21';
+    const CERT_EXT_INVALIDITY_DATE          = '2.5.29.24';
+    const CERT_EXT_DELTA_CRL_INDICATOR      = '2.5.29.27';
+    const CERT_EXT_ISSUING_DIST_POINT       = '2.5.29.28';
+    const CERT_EXT_CERT_ISSUER              = '2.5.29.29';
+    const CERT_EXT_NAME_CONSTRAINTS         = '2.5.29.30';
+    const CERT_EXT_CRL_DISTRIBUTION_POINTS  = '2.5.29.31';
+    const CERT_EXT_CERT_POLICIES            = '2.5.29.32';
+    const CERT_EXT_AUTHORITY_KEY_IDENTIFIER = '2.5.29.35';
+    const CERT_EXT_EXTENDED_KEY_USAGE       = '2.5.29.37';
+
+    // standard certificate files
+    const COMMON_NAME                       = '2.5.4.3';
+    const SURNAME                           = '2.5.4.4';
+    const SERIAL_NUMBER                     = '2.5.4.5';
+    const COUNTRY_NAME                      = '2.5.4.6';
+    const LOCALITY_NAME                     = '2.5.4.7';
+    const STATE_OR_PROVINCE_NAME            = '2.5.4.8';
+    const STREET_ADDRESS                    = '2.5.4.9';
+    const ORGANIZATION_NAME                 = '2.5.4.10';
+    const OU_NAME                           = '2.5.4.11';
+    const TITLE                             = '2.5.4.12';
+    const DESCRIPTION                       = '2.5.4.13';
+    const POSTAL_ADDRESS                    = '2.5.4.16';
+    const POSTAL_CODE                       = '2.5.4.17';
+    const AUTHORITY_REVOCATION_LIST         = '2.5.4.38';
+
+    const AUTHORITY_INFORMATION_ACCESS      = '1.3.6.1.5.5.7.1.1';
+
+    /**
+     * Returns the name of the given object identifier.
+     *
+     * Some OIDs are saved as class constants in this class.
+     * If the wanted oidString is not among them, this method will
+     * query http://oid-info.com for the right name.
+     * This behavior can be suppressed by setting the second method parameter to false.
+     *
+     * @param string $oidString
+     * @param bool $loadFromWeb
+     *
+     * @see self::loadFromWeb($oidString)
+     *
+     * @return string
+     */
+    public static function getName($oidString, $loadFromWeb = true)
+    {
+        switch ($oidString) {
+            case self::RSA_ENCRYPTION:
+                return 'RSA Encryption';
+            case self::MD5_WITH_RSA_ENCRYPTION:
+                return 'MD5 with RSA Encryption';
+            case self::SHA1_WITH_RSA_SIGNATURE:
+                return 'SHA-1 with RSA Signature';
+
+            case self::PKCS9_EMAIL:
+                return 'PKCS #9 Email Address';
+            case self::PKCS9_UNSTRUCTURED_NAME:
+                return 'PKCS #9 Unstructured Name';
+            case self::PKCS9_CONTENT_TYPE:
+                return 'PKCS #9 Content Type';
+            case self::PKCS9_MESSAGE_DIGEST:
+                return 'PKCS #9 Message Digest';
+            case self::PKCS9_SIGNING_TIME:
+                return 'PKCS #9 Signing Time';
+
+            case self::COMMON_NAME:
+                return 'Common Name';
+            case self::SURNAME:
+                return 'Surname';
+            case self::SERIAL_NUMBER:
+                return 'Serial Number';
+            case self::COUNTRY_NAME:
+                return 'Country Name';
+            case self::LOCALITY_NAME:
+                return 'Locality Name';
+            case self::STATE_OR_PROVINCE_NAME:
+                return 'State or Province Name';
+            case self::STREET_ADDRESS:
+                return 'Street Address';
+            case self::ORGANIZATION_NAME:
+                return 'Organization Name';
+            case self::OU_NAME:
+                return 'Organization Unit Name';
+            case self::TITLE:
+                return 'Title';
+            case self::DESCRIPTION:
+                return 'Description';
+            case self::POSTAL_ADDRESS:
+                return 'Postal Address';
+            case self::POSTAL_CODE:
+                return 'Postal Code';
+            case self::AUTHORITY_REVOCATION_LIST:
+                return 'Authority Revocation List';
+
+            case self::CERT_EXT_SUBJECT_DIRECTORY_ATTR:
+                return 'Subject directory attributes';
+            case self::CERT_EXT_SUBJECT_KEY_IDENTIFIER:
+                return 'Subject key identifier';
+            case self::CERT_EXT_KEY_USAGE:
+                return 'Key usage certificate extension';
+            case self::CERT_EXT_PRIVATE_KEY_USAGE_PERIOD:
+                return 'Private key usage';
+            case self::CERT_EXT_SUBJECT_ALT_NAME:
+                return 'Subject alternative name (SAN)';
+            case self::CERT_EXT_ISSUER_ALT_NAME:
+                return 'Issuer alternative name';
+            case self::CERT_EXT_BASIC_CONSTRAINTS:
+                return 'Basic constraints';
+            case self::CERT_EXT_CRL_NUMBER:
+                return 'CRL number';
+            case self::CERT_EXT_REASON_CODE:
+                return 'Reason code';
+            case self::CERT_EXT_INVALIDITY_DATE:
+                return 'Invalidity code';
+            case self::CERT_EXT_DELTA_CRL_INDICATOR:
+                return 'Delta CRL indicator';
+            case self::CERT_EXT_ISSUING_DIST_POINT:
+                return 'Issuing distribution point';
+            case self::CERT_EXT_CERT_ISSUER:
+                return 'Certificate issuer';
+            case self::CERT_EXT_NAME_CONSTRAINTS:
+                return 'Name constraints';
+            case self::CERT_EXT_CRL_DISTRIBUTION_POINTS:
+                return 'CRL distribution points';
+            case self::CERT_EXT_CERT_POLICIES:
+                return 'Certificate policies ';
+            case self::CERT_EXT_AUTHORITY_KEY_IDENTIFIER:
+                return 'Authority key identifier';
+            case self::CERT_EXT_EXTENDED_KEY_USAGE:
+                return 'Extended key usage';
+            case self::AUTHORITY_INFORMATION_ACCESS:
+                return 'Certificate Authority Information Access (AIA)';
+
+            default:
+                if ($loadFromWeb) {
+                    return self::loadFromWeb($oidString);
+                } else {
+                    return $oidString;
+                }
+        }
+    }
+
+    public static function loadFromWeb($oidString)
+    {
+        $ch = curl_init("http://oid-info.com/get/{$oidString}");
+
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
+        curl_setopt($ch, CURLOPT_HEADER, 0);
+
+        $contents = curl_exec($ch);
+        curl_close($ch);
+
+        // This pattern needs to be updated as soon as the website layout of oid-info.com changes
+        preg_match_all('#<tt>(.+)\(\d+\)</tt>#si', $contents, $oidName);
+
+        if (empty($oidName[1])) {
+            return "{$oidString} (unknown)";
+        }
+
+        $oidName = ucfirst(strtolower(preg_replace('/([A-Z][a-z])/', ' $1', $oidName[1][0])));
+        $oidName = str_replace('-', ' ', $oidName);
+
+        return "{$oidName} ({$oidString})";
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Parsable.php b/vendor/fgrosse/phpasn1/lib/ASN1/Parsable.php
new file mode 100644
index 0000000..fa66b55
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Parsable.php
@@ -0,0 +1,32 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use FG\ASN1\Exception\ParserException;
+
+/**
+ * The Parsable interface describes classes that can be parsed from their binary DER representation.
+ */
+interface Parsable
+{
+    /**
+     * Parse an instance of this class from its binary DER encoded representation.
+     *
+     * @param string $binaryData
+     * @param int $offsetIndex the offset at which parsing of the $binaryData is started. This parameter ill be modified
+     *            to contain the offset index of the next object after this object has been parsed
+     *
+     * @throws ParserException if the given binary data is either invalid or not currently supported
+     *
+     * @return static
+     */
+    public static function fromBinary(&$binaryData, &$offsetIndex = null);
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/TemplateParser.php b/vendor/fgrosse/phpasn1/lib/ASN1/TemplateParser.php
new file mode 100644
index 0000000..90a40b0
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/TemplateParser.php
@@ -0,0 +1,70 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+use Exception;
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\Universal\Sequence;
+
+class TemplateParser
+{
+    /**
+     * @param string $data
+     * @param array $template
+     * @return \FG\ASN1\ASNObject|Sequence
+     * @throws ParserException if there was an issue parsing
+     */
+    public function parseBase64($data, array $template)
+    {
+        // TODO test with invalid data
+        return $this->parseBinary(base64_decode($data), $template);
+    }
+
+    /**
+     * @param string $binary
+     * @param array $template
+     * @return \FG\ASN1\ASNObject|Sequence
+     * @throws ParserException if there was an issue parsing
+     */
+    public function parseBinary($binary, array $template)
+    {
+        $parsedObject = ASNObject::fromBinary($binary);
+
+        foreach ($template as $key => $value) {
+            $this->validate($parsedObject, $key, $value);
+        }
+
+        return $parsedObject;
+    }
+
+    private function validate(ASNObject $object, $key, $value)
+    {
+        if (is_array($value)) {
+            $this->assertTypeId($key, $object);
+
+            /* @var Construct $object */
+            foreach ($value as $key => $child) {
+                $this->validate($object->current(), $key, $child);
+                $object->next();
+            }
+        } else {
+            $this->assertTypeId($value, $object);
+        }
+    }
+
+    private function assertTypeId($expectedTypeId, ASNObject $object)
+    {
+        $actualType = $object->getType();
+        if ($expectedTypeId != $actualType) {
+            throw new Exception("Expected type ($expectedTypeId) does not match actual type ($actualType");
+        }
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BMPString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BMPString.php
new file mode 100644
index 0000000..83ec6a9
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BMPString.php
@@ -0,0 +1,41 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class BMPString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 BMP String.
+     *
+     * BMPString is a subtype of UniversalString that has its own
+     * unique tag and contains only the characters in the
+     * Basic Multilingual Plane (those corresponding to the first
+     * 64K-2 cells, less cells whose encoding is used to address
+     * characters outside the Basic Multilingual Plane) of ISO/IEC 10646-1.
+     *
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::BMP_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BitString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BitString.php
new file mode 100644
index 0000000..226695c
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/BitString.php
@@ -0,0 +1,88 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use Exception;
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+
+class BitString extends OctetString implements Parsable
+{
+    private $nrOfUnusedBits;
+
+    /**
+     * Creates a new ASN.1 BitString object.
+     *
+     * @param string|int $value Either the hexadecimal value as a string (spaces are allowed - leading 0x is optional) or a numeric value
+     * @param int $nrOfUnusedBits the number of unused bits in the last octet [optional].
+     *
+     * @throws Exception if the second parameter is no positive numeric value
+     */
+    public function __construct($value, $nrOfUnusedBits = 0)
+    {
+        parent::__construct($value);
+
+        if (!is_numeric($nrOfUnusedBits) || $nrOfUnusedBits < 0) {
+            throw new Exception('BitString: second parameter needs to be a positive number (or zero)!');
+        }
+
+        $this->nrOfUnusedBits = $nrOfUnusedBits;
+    }
+
+    public function getType()
+    {
+        return Identifier::BITSTRING;
+    }
+
+    protected function calculateContentLength()
+    {
+        // add one to the length for the first octet which encodes the number of unused bits in the last octet
+        return parent::calculateContentLength() + 1;
+    }
+
+    protected function getEncodedValue()
+    {
+        // the first octet determines the number of unused bits
+        $nrOfUnusedBitsOctet = chr($this->nrOfUnusedBits);
+        $actualContent = parent::getEncodedValue();
+
+        return $nrOfUnusedBitsOctet.$actualContent;
+    }
+
+    public function getNumberOfUnusedBits()
+    {
+        return $this->nrOfUnusedBits;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::BITSTRING, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, 2);
+
+        $nrOfUnusedBits = ord($binaryData[$offsetIndex]);
+        $value = substr($binaryData, $offsetIndex + 1, $contentLength - 1);
+
+        if ($nrOfUnusedBits > 7 || // no less than 1 used, otherwise non-minimal
+            ($contentLength - 1) == 1 && $nrOfUnusedBits > 0 || // content length only 1, no
+            (ord($value[strlen($value)-1])&((1<<$nrOfUnusedBits)-1)) != 0 // unused bits set
+        ) {
+            throw new ParserException("Can not parse bit string with invalid padding", $offsetIndex);
+        }
+
+        $offsetIndex += $contentLength;
+
+        $parsedObject = new self(bin2hex($value), $nrOfUnusedBits);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Boolean.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Boolean.php
new file mode 100644
index 0000000..b73c99f
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Boolean.php
@@ -0,0 +1,75 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Exception\ParserException;
+
+class Boolean extends ASNObject implements Parsable
+{
+    private $value;
+
+    /**
+     * @param bool $value
+     */
+    public function __construct($value)
+    {
+        $this->value = $value;
+    }
+
+    public function getType()
+    {
+        return Identifier::BOOLEAN;
+    }
+
+    protected function calculateContentLength()
+    {
+        return 1;
+    }
+
+    protected function getEncodedValue()
+    {
+        if ($this->value == false) {
+            return chr(0x00);
+        } else {
+            return chr(0xFF);
+        }
+    }
+
+    public function getContent()
+    {
+        if ($this->value == true) {
+            return 'TRUE';
+        } else {
+            return 'FALSE';
+        }
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::BOOLEAN, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+
+        if ($contentLength != 1) {
+            throw new ParserException("An ASN.1 Boolean should not have a length other than one. Extracted length was {$contentLength}", $offsetIndex);
+        }
+
+        $value = ord($binaryData[$offsetIndex++]);
+        $booleanValue = $value == 0xFF ? true : false;
+
+        $parsedObject = new self($booleanValue);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/CharacterString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/CharacterString.php
new file mode 100644
index 0000000..bfc170d
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/CharacterString.php
@@ -0,0 +1,28 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class CharacterString extends AbstractString
+{
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::CHARACTER_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Enumerated.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Enumerated.php
new file mode 100644
index 0000000..06d04a3
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Enumerated.php
@@ -0,0 +1,21 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\Identifier;
+
+class Enumerated extends Integer
+{
+    public function getType()
+    {
+        return Identifier::ENUMERATED;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GeneralString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GeneralString.php
new file mode 100644
index 0000000..fb0346f
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GeneralString.php
@@ -0,0 +1,34 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class GeneralString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 GeneralString.
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::GENERAL_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GeneralizedTime.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GeneralizedTime.php
new file mode 100644
index 0000000..ca92209
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GeneralizedTime.php
@@ -0,0 +1,134 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractTime;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Exception\ParserException;
+
+/**
+ * This ASN.1 universal type contains date and time information according to ISO 8601.
+ *
+ * The type consists of values representing:
+ * a) a calendar date, as defined in ISO 8601; and
+ * b) a time of day, to any of the precisions defined in ISO 8601, except for the hours value 24 which shall not be used; and
+ * c) the local time differential factor as defined in ISO 8601.
+ *
+ * Decoding of this type will accept the Basic Encoding Rules (BER)
+ * The encoding will comply with the Distinguished Encoding Rules (DER).
+ */
+class GeneralizedTime extends AbstractTime implements Parsable
+{
+    private $microseconds;
+
+    public function __construct($dateTime = null, $dateTimeZone = 'UTC')
+    {
+        parent::__construct($dateTime, $dateTimeZone);
+        $this->microseconds = $this->value->format('u');
+        if ($this->containsFractionalSecondsElement()) {
+            // DER requires us to remove trailing zeros
+            $this->microseconds = preg_replace('/([1-9]+)0+$/', '$1', $this->microseconds);
+        }
+    }
+
+    public function getType()
+    {
+        return Identifier::GENERALIZED_TIME;
+    }
+
+    protected function calculateContentLength()
+    {
+        $contentSize = 15; // YYYYMMDDHHmmSSZ
+
+        if ($this->containsFractionalSecondsElement()) {
+            $contentSize += 1 + strlen($this->microseconds);
+        }
+
+        return $contentSize;
+    }
+
+    public function containsFractionalSecondsElement()
+    {
+        return intval($this->microseconds) > 0;
+    }
+
+    protected function getEncodedValue()
+    {
+        $encodedContent = $this->value->format('YmdHis');
+        if ($this->containsFractionalSecondsElement()) {
+            $encodedContent .= ".{$this->microseconds}";
+        }
+
+        return $encodedContent.'Z';
+    }
+
+    public function __toString()
+    {
+        if ($this->containsFractionalSecondsElement()) {
+            return $this->value->format("Y-m-d\tH:i:s.uP");
+        } else {
+            return $this->value->format("Y-m-d\tH:i:sP");
+        }
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::GENERALIZED_TIME, $offsetIndex++);
+        $lengthOfMinimumTimeString = 14; // YYYYMMDDHHmmSS
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, $lengthOfMinimumTimeString);
+        $maximumBytesToRead = $contentLength;
+
+        $format = 'YmdGis';
+        $content = substr($binaryData, $offsetIndex, $contentLength);
+        $dateTimeString = substr($content, 0, $lengthOfMinimumTimeString);
+        $offsetIndex += $lengthOfMinimumTimeString;
+        $maximumBytesToRead -= $lengthOfMinimumTimeString;
+
+        if ($contentLength == $lengthOfMinimumTimeString) {
+            $localTimeZone = new \DateTimeZone(date_default_timezone_get());
+            $dateTime = \DateTime::createFromFormat($format, $dateTimeString, $localTimeZone);
+        } else {
+            if ($binaryData[$offsetIndex] == '.') {
+                $maximumBytesToRead--; // account for the '.'
+                $nrOfFractionalSecondElements = 1; // account for the '.'
+
+                while ($maximumBytesToRead > 0
+                      && $binaryData[$offsetIndex + $nrOfFractionalSecondElements] != '+'
+                      && $binaryData[$offsetIndex + $nrOfFractionalSecondElements] != '-'
+                      && $binaryData[$offsetIndex + $nrOfFractionalSecondElements] != 'Z') {
+                    $nrOfFractionalSecondElements++;
+                    $maximumBytesToRead--;
+                }
+
+                $dateTimeString .= substr($binaryData, $offsetIndex, $nrOfFractionalSecondElements);
+                $offsetIndex += $nrOfFractionalSecondElements;
+                $format .= '.u';
+            }
+
+            $dateTime = \DateTime::createFromFormat($format, $dateTimeString, new \DateTimeZone('UTC'));
+
+            if ($maximumBytesToRead > 0) {
+                if ($binaryData[$offsetIndex] == '+'
+                || $binaryData[$offsetIndex] == '-') {
+                    $dateTime = static::extractTimeZoneData($binaryData, $offsetIndex, $dateTime);
+                } elseif ($binaryData[$offsetIndex++] != 'Z') {
+                    throw new ParserException('Invalid ISO 8601 Time String', $offsetIndex);
+                }
+            }
+        }
+
+        $parsedObject = new self($dateTime);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GraphicString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GraphicString.php
new file mode 100644
index 0000000..4a01d67
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/GraphicString.php
@@ -0,0 +1,34 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class GraphicString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 Graphic String.
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::GRAPHIC_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/IA5String.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/IA5String.php
new file mode 100644
index 0000000..33a8067
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/IA5String.php
@@ -0,0 +1,35 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+/**
+ * The International Alphabet No.5 (IA5) references the encoding of the ASCII characters.
+ *
+ * Each character in the data is encoded as 1 byte.
+ */
+class IA5String extends AbstractString
+{
+    public function __construct($string)
+    {
+        parent::__construct($string);
+        for ($i = 1; $i < 128; $i++) {
+            $this->allowCharacter(chr($i));
+        }
+    }
+
+    public function getType()
+    {
+        return Identifier::IA5_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Integer.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Integer.php
new file mode 100644
index 0000000..fe3806b
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Integer.php
@@ -0,0 +1,130 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use Exception;
+use FG\Utility\BigInteger;
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+
+class Integer extends ASNObject implements Parsable
+{
+    /** @var int */
+    private $value;
+
+    /**
+     * @param int $value
+     *
+     * @throws Exception if the value is not numeric
+     */
+    public function __construct($value)
+    {
+        if (is_numeric($value) == false) {
+            throw new Exception("Invalid VALUE [{$value}] for ASN1_INTEGER");
+        }
+        $this->value = $value;
+    }
+
+    public function getType()
+    {
+        return Identifier::INTEGER;
+    }
+
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    protected function calculateContentLength()
+    {
+        return strlen($this->getEncodedValue());
+    }
+
+    protected function getEncodedValue()
+    {
+        $value = BigInteger::create($this->value, 10);
+        $negative = $value->compare(0) < 0;
+        if ($negative) {
+             $value = $value->absoluteValue();
+             $limit = 0x80;
+        } else {
+             $limit = 0x7f;
+        }
+
+        $mod = 0xff+1;
+        $values = [];
+        while($value->compare($limit) > 0) {
+            $values[] = $value->modulus($mod)->toInteger();
+            $value = $value->shiftRight(8);
+        }
+
+        $values[] = $value->modulus($mod)->toInteger();
+        $numValues = count($values);
+
+        if ($negative) {
+            for ($i = 0; $i < $numValues; $i++) {
+                $values[$i] = 0xff - $values[$i];
+            }
+            for ($i = 0; $i < $numValues; $i++) {
+                $values[$i] += 1;
+                if ($values[$i] <= 0xff) {
+                    break;
+                }
+                assert($i != $numValues - 1);
+                $values[$i] = 0;
+            }
+            if ($values[$numValues - 1] == 0x7f) {
+                $values[] = 0xff;
+            }
+        }
+        $values = array_reverse($values);
+        $r = pack("C*", ...$values);
+        return $r;
+    }
+
+    private static function ensureMinimalEncoding($binaryData, $offsetIndex)
+    {
+        // All the first nine bits cannot equal 0 or 1, which would
+        // be non-minimal encoding for positive and negative integers respectively
+        if ((ord($binaryData[$offsetIndex]) == 0x00 && (ord($binaryData[$offsetIndex+1]) & 0x80) == 0) ||
+            (ord($binaryData[$offsetIndex]) == 0xff && (ord($binaryData[$offsetIndex+1]) & 0x80) == 0x80)) {
+            throw new ParserException("Integer not minimally encoded", $offsetIndex);
+        }
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        $parsedObject = new static(0);
+        self::parseIdentifier($binaryData[$offsetIndex], $parsedObject->getType(), $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, 1);
+
+        if ($contentLength > 1) {
+            self::ensureMinimalEncoding($binaryData, $offsetIndex);
+        }
+        $isNegative = (ord($binaryData[$offsetIndex]) & 0x80) != 0x00;
+        $number = BigInteger::create(ord($binaryData[$offsetIndex++]) & 0x7F);
+
+        for ($i = 0; $i < $contentLength - 1; $i++) {
+            $number = $number->multiply(0x100)->add(ord($binaryData[$offsetIndex++]));
+        }
+
+        if ($isNegative) {
+            $number = $number->subtract(BigInteger::create(2)->toPower(8 * $contentLength - 1));
+        }
+
+        $parsedObject = new static((string)$number);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/NullObject.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/NullObject.php
new file mode 100644
index 0000000..b5293e4
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/NullObject.php
@@ -0,0 +1,54 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Exception\ParserException;
+
+class NullObject extends ASNObject implements Parsable
+{
+    public function getType()
+    {
+        return Identifier::NULL;
+    }
+
+    protected function calculateContentLength()
+    {
+        return 0;
+    }
+
+    protected function getEncodedValue()
+    {
+        return null;
+    }
+
+    public function getContent()
+    {
+        return 'NULL';
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::NULL, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+
+        if ($contentLength != 0) {
+            throw new ParserException("An ASN.1 Null should not have a length other than zero. Extracted length was {$contentLength}", $offsetIndex);
+        }
+
+        $parsedObject = new self();
+        $parsedObject->setContentLength(0);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/NumericString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/NumericString.php
new file mode 100644
index 0000000..13fb7c3
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/NumericString.php
@@ -0,0 +1,38 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class NumericString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 NumericString.
+     *
+     * The following characters are permitted:
+     * Digits                0,1, ... 9
+     * SPACE                 (space)
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowNumbers();
+        $this->allowSpaces();
+    }
+
+    public function getType()
+    {
+        return Identifier::NUMERIC_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/ObjectDescriptor.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/ObjectDescriptor.php
new file mode 100644
index 0000000..1c5d349
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/ObjectDescriptor.php
@@ -0,0 +1,26 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\Identifier;
+
+class ObjectDescriptor extends GraphicString
+{
+    public function __construct($objectDescription)
+    {
+        parent::__construct($objectDescription);
+    }
+
+    public function getType()
+    {
+        return Identifier::OBJECT_DESCRIPTOR;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/ObjectIdentifier.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/ObjectIdentifier.php
new file mode 100644
index 0000000..150ce9c
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/ObjectIdentifier.php
@@ -0,0 +1,138 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use Exception;
+use FG\ASN1\Base128;
+use FG\ASN1\OID;
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Exception\ParserException;
+
+class ObjectIdentifier extends ASNObject implements Parsable
+{
+    protected $subIdentifiers;
+    protected $value;
+
+    public function __construct($value)
+    {
+        $this->subIdentifiers = explode('.', $value);
+        $nrOfSubIdentifiers = count($this->subIdentifiers);
+
+        for ($i = 0; $i < $nrOfSubIdentifiers; $i++) {
+            if (is_numeric($this->subIdentifiers[$i])) {
+                // enforce the integer type
+                $this->subIdentifiers[$i] = intval($this->subIdentifiers[$i]);
+            } else {
+                throw new Exception("[{$value}] is no valid object identifier (sub identifier ".($i + 1).' is not numeric)!');
+            }
+        }
+
+        // Merge the first to arcs of the OID registration tree (per ASN definition!)
+        if ($nrOfSubIdentifiers >= 2) {
+            $this->subIdentifiers[1] = ($this->subIdentifiers[0] * 40) + $this->subIdentifiers[1];
+            unset($this->subIdentifiers[0]);
+        }
+
+        $this->value = $value;
+    }
+
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    public function getType()
+    {
+        return Identifier::OBJECT_IDENTIFIER;
+    }
+
+    protected function calculateContentLength()
+    {
+        $length = 0;
+        foreach ($this->subIdentifiers as $subIdentifier) {
+            do {
+                $subIdentifier = $subIdentifier >> 7;
+                $length++;
+            } while ($subIdentifier > 0);
+        }
+
+        return $length;
+    }
+
+    protected function getEncodedValue()
+    {
+        $encodedValue = '';
+        foreach ($this->subIdentifiers as $subIdentifier) {
+            $encodedValue .= Base128::encode($subIdentifier);
+        }
+
+        return $encodedValue;
+    }
+
+    public function __toString()
+    {
+        return OID::getName($this->value);
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::OBJECT_IDENTIFIER, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, 1);
+
+        $firstOctet = ord($binaryData[$offsetIndex++]);
+        $oidString = floor($firstOctet / 40).'.'.($firstOctet % 40);
+        $oidString .= '.'.self::parseOid($binaryData, $offsetIndex, $contentLength - 1);
+
+        $parsedObject = new self($oidString);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+
+    /**
+     * Parses an object identifier except for the first octet, which is parsed
+     * differently. This way relative object identifiers can also be parsed
+     * using this.
+     *
+     * @param $binaryData
+     * @param $offsetIndex
+     * @param $octetsToRead
+     *
+     * @throws ParserException
+     *
+     * @return string
+     */
+    protected static function parseOid(&$binaryData, &$offsetIndex, $octetsToRead)
+    {
+        $oid = '';
+
+        while ($octetsToRead > 0) {
+            $octets = '';
+
+            do {
+                if (0 === $octetsToRead) {
+                    throw new ParserException('Malformed ASN.1 Object Identifier', $offsetIndex - 1);
+                }
+
+                $octetsToRead--;
+                $octet = $binaryData[$offsetIndex++];
+                $octets .= $octet;
+            } while (ord($octet) & 0x80);
+
+            $oid .= sprintf('%d.', Base128::decode($octets));
+        }
+
+        // Remove trailing '.'
+        return substr($oid, 0, -1) ?: '';
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/OctetString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/OctetString.php
new file mode 100644
index 0000000..5d69ae7
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/OctetString.php
@@ -0,0 +1,91 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use Exception;
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+
+class OctetString extends ASNObject implements Parsable
+{
+    protected $value;
+
+    public function __construct($value)
+    {
+        if (is_string($value)) {
+            // remove gaps between hex digits
+            $value = preg_replace('/\s|0x/', '', $value);
+        } elseif (is_numeric($value)) {
+            $value = dechex($value);
+        } elseif ($value === null) {
+            return;
+        } else {
+            throw new Exception('OctetString: unrecognized input type!');
+        }
+
+        if (strlen($value) % 2 != 0) {
+            // transform values like 1F2 to 01F2
+            $value = '0'.$value;
+        }
+
+        $this->value = $value;
+    }
+
+    public function getType()
+    {
+        return Identifier::OCTETSTRING;
+    }
+
+    protected function calculateContentLength()
+    {
+        return strlen($this->value) / 2;
+    }
+
+    protected function getEncodedValue()
+    {
+        $value = $this->value;
+        $result = '';
+
+        //Actual content
+        while (strlen($value) >= 2) {
+            // get the hex value byte by byte from the string and and add it to binary result
+            $result .= chr(hexdec(substr($value, 0, 2)));
+            $value = substr($value, 2);
+        }
+
+        return $result;
+    }
+
+    public function getContent()
+    {
+        return strtoupper($this->value);
+    }
+
+    public function getBinaryContent()
+    {
+        return $this->getEncodedValue();
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::OCTETSTRING, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+
+        $value = substr($binaryData, $offsetIndex, $contentLength);
+        $offsetIndex += $contentLength;
+
+        $parsedObject = new self(bin2hex($value));
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/PrintableString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/PrintableString.php
new file mode 100644
index 0000000..fe6d4bc
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/PrintableString.php
@@ -0,0 +1,53 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class PrintableString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 PrintableString.
+     *
+     * The ITU-T X.680 Table 8 permits the following characters:
+     * Latin capital letters A,B, ... Z
+     * Latin small letters   a,b, ... z
+     * Digits                0,1, ... 9
+     * SPACE                 (space)
+     * APOSTROPHE            '
+     * LEFT PARENTHESIS      (
+     * RIGHT PARENTHESIS     )
+     * PLUS SIGN             +
+     * COMMA                 ,
+     * HYPHEN-MINUS          -
+     * FULL STOP             .
+     * SOLIDUS               /
+     * COLON                 :
+     * EQUALS SIGN           =
+     * QUESTION MARK         ?
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowNumbers();
+        $this->allowAllLetters();
+        $this->allowSpaces();
+        $this->allowCharacters("'", '(', ')', '+', '-', '.', ',', '/', ':', '=', '?');
+    }
+
+    public function getType()
+    {
+        return Identifier::PRINTABLE_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/RelativeObjectIdentifier.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/RelativeObjectIdentifier.php
new file mode 100644
index 0000000..2aa9643
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/RelativeObjectIdentifier.php
@@ -0,0 +1,57 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use Exception;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Exception\ParserException;
+
+class RelativeObjectIdentifier extends ObjectIdentifier implements Parsable
+{
+    public function __construct($subIdentifiers)
+    {
+        $this->value = $subIdentifiers;
+        $this->subIdentifiers = explode('.', $subIdentifiers);
+        $nrOfSubIdentifiers = count($this->subIdentifiers);
+
+        for ($i = 0; $i < $nrOfSubIdentifiers; $i++) {
+            if (is_numeric($this->subIdentifiers[$i])) {
+                // enforce the integer type
+                $this->subIdentifiers[$i] = intval($this->subIdentifiers[$i]);
+            } else {
+                throw new Exception("[{$subIdentifiers}] is no valid object identifier (sub identifier ".($i + 1).' is not numeric)!');
+            }
+        }
+    }
+
+    public function getType()
+    {
+        return Identifier::RELATIVE_OID;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::RELATIVE_OID, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, 1);
+
+        try {
+            $oidString = self::parseOid($binaryData, $offsetIndex, $contentLength);
+        } catch (ParserException $e) {
+            throw new ParserException('Malformed ASN.1 Relative Object Identifier', $e->getOffset());
+        }
+
+        $parsedObject = new self($oidString);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Sequence.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Sequence.php
new file mode 100644
index 0000000..0397cf1
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Sequence.php
@@ -0,0 +1,23 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\Construct;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+
+class Sequence extends Construct implements Parsable
+{
+    public function getType()
+    {
+        return Identifier::SEQUENCE;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Set.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Set.php
new file mode 100644
index 0000000..6e6d346
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/Set.php
@@ -0,0 +1,21 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\Identifier;
+
+class Set extends Sequence
+{
+    public function getType()
+    {
+        return Identifier::SET;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/T61String.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/T61String.php
new file mode 100644
index 0000000..5641864
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/T61String.php
@@ -0,0 +1,36 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class T61String extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 T61 String.
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @see http://en.wikipedia.org/wiki/ITU_T.61
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::T61_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UTCTime.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UTCTime.php
new file mode 100644
index 0000000..c4d303c
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UTCTime.php
@@ -0,0 +1,77 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractTime;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Exception\ParserException;
+
+/**
+ * This ASN.1 universal type contains the calendar date and time.
+ *
+ * The precision is one minute or one second and optionally a
+ * local time differential from coordinated universal time.
+ *
+ * Decoding of this type will accept the Basic Encoding Rules (BER)
+ * The encoding will comply with the Distinguished Encoding Rules (DER).
+ */
+class UTCTime extends AbstractTime implements Parsable
+{
+    public function getType()
+    {
+        return Identifier::UTC_TIME;
+    }
+
+    protected function calculateContentLength()
+    {
+        return 13; // Content is a string o the following format: YYMMDDhhmmssZ (13 octets)
+    }
+
+    protected function getEncodedValue()
+    {
+        return $this->value->format('ymdHis').'Z';
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::UTC_TIME, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex, 11);
+
+        $format = 'ymdGi';
+        $dateTimeString = substr($binaryData, $offsetIndex, 10);
+        $offsetIndex += 10;
+
+        // extract optional seconds part
+        if ($binaryData[$offsetIndex] != 'Z'
+        && $binaryData[$offsetIndex] != '+'
+        && $binaryData[$offsetIndex] != '-') {
+            $dateTimeString .= substr($binaryData, $offsetIndex, 2);
+            $offsetIndex += 2;
+            $format .= 's';
+        }
+
+        $dateTime = \DateTime::createFromFormat($format, $dateTimeString, new \DateTimeZone('UTC'));
+
+        // extract time zone settings
+        if ($binaryData[$offsetIndex] == '+'
+        || $binaryData[$offsetIndex] == '-') {
+            $dateTime = static::extractTimeZoneData($binaryData, $offsetIndex, $dateTime);
+        } elseif ($binaryData[$offsetIndex++] != 'Z') {
+            throw new ParserException('Invalid UTC String', $offsetIndex);
+        }
+
+        $parsedObject = new self($dateTime);
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UTF8String.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UTF8String.php
new file mode 100644
index 0000000..cba568d
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UTF8String.php
@@ -0,0 +1,34 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class UTF8String extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 Universal String.
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::UTF8_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UniversalString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UniversalString.php
new file mode 100644
index 0000000..0c3fe1d
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/UniversalString.php
@@ -0,0 +1,36 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class UniversalString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 Universal String.
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @see http://en.wikipedia.org/wiki/Universal_Character_Set
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::UNIVERSAL_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/Universal/VisibleString.php b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/VisibleString.php
new file mode 100644
index 0000000..d9326d3
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/Universal/VisibleString.php
@@ -0,0 +1,34 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1\Universal;
+
+use FG\ASN1\AbstractString;
+use FG\ASN1\Identifier;
+
+class VisibleString extends AbstractString
+{
+    /**
+     * Creates a new ASN.1 Visible String.
+     * TODO The encodable characters of this type are not yet checked.
+     *
+     * @param string $string
+     */
+    public function __construct($string)
+    {
+        $this->value = $string;
+        $this->allowAll();
+    }
+
+    public function getType()
+    {
+        return Identifier::VISIBLE_STRING;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/UnknownConstructedObject.php b/vendor/fgrosse/phpasn1/lib/ASN1/UnknownConstructedObject.php
new file mode 100644
index 0000000..b19a07a
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/UnknownConstructedObject.php
@@ -0,0 +1,59 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+class UnknownConstructedObject extends Construct
+{
+    private $identifier;
+    private $contentLength;
+
+    /**
+     * @param string $binaryData
+     * @param int $offsetIndex
+     *
+     * @throws \FG\ASN1\Exception\ParserException
+     */
+    public function __construct($binaryData, &$offsetIndex)
+    {
+        $this->identifier = self::parseBinaryIdentifier($binaryData, $offsetIndex);
+        $this->contentLength = self::parseContentLength($binaryData, $offsetIndex);
+
+        $children = [];
+        $octetsToRead = $this->contentLength;
+        while ($octetsToRead > 0) {
+            $newChild = ASNObject::fromBinary($binaryData, $offsetIndex);
+            $octetsToRead -= $newChild->getObjectLength();
+            $children[] = $newChild;
+        }
+
+        parent::__construct(...$children);
+    }
+
+    public function getType()
+    {
+        return ord($this->identifier);
+    }
+
+    public function getIdentifier()
+    {
+        return $this->identifier;
+    }
+
+    protected function calculateContentLength()
+    {
+        return $this->contentLength;
+    }
+
+    protected function getEncodedValue()
+    {
+        return '';
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/ASN1/UnknownObject.php b/vendor/fgrosse/phpasn1/lib/ASN1/UnknownObject.php
new file mode 100644
index 0000000..4ac536a
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/ASN1/UnknownObject.php
@@ -0,0 +1,59 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\ASN1;
+
+class UnknownObject extends ASNObject
+{
+    /** @var string */
+    private $value;
+
+    private $identifier;
+
+    /**
+     * @param string|int $identifier Either the first identifier octet as int or all identifier bytes as a string
+     * @param int        $contentLength
+     */
+    public function __construct($identifier, $contentLength)
+    {
+        if (is_int($identifier)) {
+            $identifier = chr($identifier);
+        }
+
+        $this->identifier = $identifier;
+        $this->value = "Unparsable Object ({$contentLength} bytes)";
+        $this->setContentLength($contentLength);
+    }
+
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    public function getType()
+    {
+        return ord($this->identifier[0]);
+    }
+
+    public function getIdentifier()
+    {
+        return $this->identifier;
+    }
+
+    protected function calculateContentLength()
+    {
+        return $this->getContentLength();
+    }
+
+    protected function getEncodedValue()
+    {
+        return '';
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/Utility/BigInteger.php b/vendor/fgrosse/phpasn1/lib/Utility/BigInteger.php
new file mode 100644
index 0000000..866162c
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/Utility/BigInteger.php
@@ -0,0 +1,195 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\Utility;
+
+/**
+ * Class BigInteger
+ * Utility class to remove dependence on a single large number library. Not intended for external use, this class only
+ * implements the functionality needed throughout this project.
+ *
+ * Instances are immutable, all operations return a new instance with the result.
+ *
+ * @package FG\Utility
+ * @internal
+ */
+abstract class BigInteger
+{
+    /**
+     * Force a preference on the underlying big number implementation, useful for testing.
+     * @var string|null
+     */
+    private static $_prefer;
+
+    public static function setPrefer($prefer = null)
+    {
+        self::$_prefer = $prefer;
+    }
+
+    /**
+     * Create a BigInteger instance based off the base 10 string or an integer.
+     * @param string|int $val
+     * @return BigInteger
+     * @throws \InvalidArgumentException
+     */
+    public static function create($val)
+    {
+        if (self::$_prefer) {
+            switch (self::$_prefer) {
+                case 'gmp':
+                    $ret = new BigIntegerGmp();
+                    break;
+                case 'bcmath':
+                    $ret = new BigIntegerBcmath();
+                    break;
+                default:
+                    throw new \UnexpectedValueException('Unknown number implementation: ' . self::$_prefer);
+            }
+        }
+        else {
+            // autodetect
+            if (function_exists('gmp_add')) {
+                $ret = new BigIntegerGmp();
+            }
+            elseif (function_exists('bcadd')) {
+                $ret = new BigIntegerBcmath();
+            } else {
+                throw new \RuntimeException('Requires GMP or bcmath extension.');
+            }
+        }
+
+        if (is_int($val)) {
+            $ret->_fromInteger($val);
+        }
+        else {
+            // convert to string, if not already one
+            $val = (string)$val;
+
+            // validate string
+            if (!preg_match('/^-?[0-9]+$/', $val)) {
+                throw new \InvalidArgumentException('Expects a string representation of an integer.');
+            }
+            $ret->_fromString($val);
+        }
+
+        return $ret;
+    }
+
+    /**
+     * BigInteger constructor.
+     * Prevent directly instantiating object, use BigInteger::create instead.
+     */
+    protected function __construct()
+    {
+
+    }
+
+    /**
+     * Subclasses must provide clone functionality.
+     * @return BigInteger
+     */
+    abstract public function __clone();
+
+    /**
+     * Assign the instance value from base 10 string.
+     * @param string $str
+     */
+    abstract protected function _fromString($str);
+
+    /**
+     * Assign the instance value from an integer type.
+     * @param int $integer
+     */
+    abstract protected function _fromInteger($integer);
+
+    /**
+     * Must provide string implementation that returns base 10 number.
+     * @return string
+     */
+    abstract public function __toString();
+
+    /* INFORMATIONAL FUNCTIONS */
+
+    /**
+     * Return integer, if possible. Throws an exception if the number can not be represented as a native integer.
+     * @return int
+     * @throws \OverflowException
+     */
+    abstract public function toInteger();
+
+    /**
+     * Is represented integer negative?
+     * @return bool
+     */
+    abstract public function isNegative();
+
+    /**
+     * Compare the integer with $number, returns a negative integer if $this is less than number, returns 0 if $this is
+     * equal to number and returns a positive integer if $this is greater than number.
+     * @param BigInteger|string|int $number
+     * @return int
+     */
+    abstract public function compare($number);
+
+    /* MODIFY */
+
+    /**
+     * Add another integer $b and returns the result.
+     * @param BigInteger|string|int $b
+     * @return BigInteger
+     */
+    abstract public function add($b);
+
+    /**
+     * Subtract $b from $this and returns the result.
+     * @param BigInteger|string|int $b
+     * @return BigInteger
+     */
+    abstract public function subtract($b);
+
+    /**
+     * Multiply value.
+     * @param BigInteger|string|int $b
+     * @return BigInteger
+     */
+    abstract public function multiply($b);
+
+    /**
+     * The value $this modulus $b.
+     * @param BigInteger|string|int $b
+     * @return BigInteger
+     */
+    abstract public function modulus($b);
+
+    /**
+     * Raise $this to the power of $b and returns the result.
+     * @param BigInteger|string|int $b
+     * @return BigInteger
+     */
+    abstract public function toPower($b);
+
+    /**
+     * Shift the value to the right by a set number of bits and returns the result.
+     * @param int $bits
+     * @return BigInteger
+     */
+    abstract public function shiftRight($bits = 8);
+
+    /**
+     * Shift the value to the left by a set number of bits and returns the result.
+     * @param int $bits
+     * @return BigInteger
+     */
+    abstract public function shiftLeft($bits = 8);
+
+    /**
+     * Returns the absolute value.
+     * @return BigInteger
+     */
+    abstract public function absoluteValue();
+}
diff --git a/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerBcmath.php b/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerBcmath.php
new file mode 100644
index 0000000..25ad891
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerBcmath.php
@@ -0,0 +1,133 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\Utility;
+
+/**
+ * Class BigIntegerBcmath
+ * Integer representation of big numbers using the bcmath library to perform large operations.
+ * @package FG\Utility
+ * @internal
+ */
+class BigIntegerBcmath extends BigInteger
+{
+    protected $_str;
+
+    public function __clone()
+    {
+        // nothing needed to copy
+    }
+
+    protected function _fromString($str)
+    {
+        $this->_str = (string)$str;
+    }
+
+    protected function _fromInteger($integer)
+    {
+        $this->_str = (string)$integer;
+    }
+
+    public function __toString()
+    {
+        return $this->_str;
+    }
+
+    public function toInteger()
+    {
+        if ($this->compare(PHP_INT_MAX) > 0 || $this->compare(PHP_INT_MIN) < 0) {
+            throw new \OverflowException(sprintf('Can not represent %s as integer.', $this->_str));
+        }
+        return (int)$this->_str;
+    }
+
+    public function isNegative()
+    {
+        return bccomp($this->_str, '0', 0) < 0;
+    }
+
+    protected function _unwrap($number)
+    {
+        if ($number instanceof self) {
+            return $number->_str;
+        }
+        return $number;
+    }
+
+    public function compare($number)
+    {
+        return bccomp($this->_str, $this->_unwrap($number), 0);
+    }
+
+    public function add($b)
+    {
+        $ret = new self();
+        $ret->_str = bcadd($this->_str, $this->_unwrap($b), 0);
+        return $ret;
+    }
+
+    public function subtract($b)
+    {
+        $ret = new self();
+        $ret->_str = bcsub($this->_str, $this->_unwrap($b), 0);
+        return $ret;
+    }
+
+    public function multiply($b)
+    {
+        $ret = new self();
+        $ret->_str = bcmul($this->_str, $this->_unwrap($b), 0);
+        return $ret;
+    }
+
+    public function modulus($b)
+    {
+        $ret = new self();
+        if ($this->isNegative()) {
+            // bcmod handles negative numbers differently
+            $b = $this->_unwrap($b);
+            $ret->_str = bcsub($b, bcmod(bcsub('0', $this->_str, 0), $b), 0);
+        }
+        else {
+            $ret->_str = bcmod($this->_str, $this->_unwrap($b));
+        }
+        return $ret;
+    }
+
+    public function toPower($b)
+    {
+        $ret = new self();
+        $ret->_str = bcpow($this->_str, $this->_unwrap($b), 0);
+        return $ret;
+    }
+
+    public function shiftRight($bits = 8)
+    {
+        $ret = new self();
+        $ret->_str = bcdiv($this->_str, bcpow('2', $bits));
+        return $ret;
+    }
+
+    public function shiftLeft($bits = 8) {
+        $ret = new self();
+        $ret->_str = bcmul($this->_str, bcpow('2', $bits));
+        return $ret;
+    }
+
+    public function absoluteValue()
+    {
+        $ret = new self();
+        if (-1 === bccomp($this->_str, '0', 0)) {
+            $ret->_str = bcsub('0', $this->_str, 0);
+        }
+        else {
+            $ret->_str = $this->_str;
+        }
+        return $ret;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerGmp.php b/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerGmp.php
new file mode 100644
index 0000000..0791226
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerGmp.php
@@ -0,0 +1,133 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\Utility;
+
+/**
+ * Class BigIntegerGmp
+ * Integer representation of big numbers using the GMP extension to perform operations.
+ * @package FG\Utility
+ * @internal
+ */
+class BigIntegerGmp extends BigInteger
+{
+    /**
+     * Resource handle.
+     * @var \GMP
+     */
+    protected $_rh;
+
+    public function __clone()
+    {
+        $this->_rh = gmp_add($this->_rh, 0);
+    }
+
+    protected function _fromString($str)
+    {
+        $this->_rh = gmp_init($str, 10);
+    }
+
+    protected function _fromInteger($integer)
+    {
+        $this->_rh = gmp_init($integer, 10);
+    }
+
+    public function __toString()
+    {
+        return gmp_strval($this->_rh, 10);
+    }
+
+    public function toInteger()
+    {
+        if ($this->compare(PHP_INT_MAX) > 0 || $this->compare(PHP_INT_MIN) < 0) {
+            throw new \OverflowException(sprintf('Can not represent %s as integer.', $this));
+        }
+        return gmp_intval($this->_rh);
+    }
+
+    public function isNegative()
+    {
+        return gmp_sign($this->_rh) === -1;
+    }
+
+    protected function _unwrap($number)
+    {
+        if ($number instanceof self) {
+            return $number->_rh;
+        }
+        return $number;
+    }
+
+    public function compare($number)
+    {
+        return gmp_cmp($this->_rh, $this->_unwrap($number));
+    }
+
+    public function add($b)
+    {
+        $ret = new self();
+        $ret->_rh = gmp_add($this->_rh, $this->_unwrap($b));
+        return $ret;
+    }
+
+    public function subtract($b)
+    {
+        $ret = new self();
+        $ret->_rh = gmp_sub($this->_rh, $this->_unwrap($b));
+        return $ret;
+    }
+
+    public function multiply($b)
+    {
+        $ret = new self();
+        $ret->_rh = gmp_mul($this->_rh, $this->_unwrap($b));
+        return $ret;
+    }
+
+    public function modulus($b)
+    {
+        $ret = new self();
+        $ret->_rh = gmp_mod($this->_rh, $this->_unwrap($b));
+        return $ret;
+    }
+
+    public function toPower($b)
+    {
+        if ($b instanceof self) {
+            // gmp_pow accepts just an integer
+            if ($b->compare(PHP_INT_MAX) > 0) {
+                throw new \UnexpectedValueException('Unable to raise to power greater than PHP_INT_MAX.');
+            }
+            $b = gmp_intval($b->_rh);
+        }
+        $ret = new self();
+        $ret->_rh = gmp_pow($this->_rh, $b);
+        return $ret;
+    }
+
+    public function shiftRight($bits=8)
+    {
+        $ret = new self();
+        $ret->_rh = gmp_div($this->_rh, gmp_pow(2, $bits));
+        return $ret;
+    }
+
+    public function shiftLeft($bits=8)
+    {
+        $ret = new self();
+        $ret->_rh = gmp_mul($this->_rh, gmp_pow(2, $bits));
+        return $ret;
+    }
+
+    public function absoluteValue()
+    {
+        $ret = new self();
+        $ret->_rh = gmp_abs($this->_rh);
+        return $ret;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/AlgorithmIdentifier.php b/vendor/fgrosse/phpasn1/lib/X509/AlgorithmIdentifier.php
new file mode 100644
index 0000000..a06b56f
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/AlgorithmIdentifier.php
@@ -0,0 +1,22 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509;
+
+use FG\ASN1\Universal\NullObject;
+use FG\ASN1\Composite\AttributeTypeAndValue;
+
+class AlgorithmIdentifier extends AttributeTypeAndValue
+{
+    public function __construct($objectIdentifierString)
+    {
+        parent::__construct($objectIdentifierString, new NullObject());
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/CSR/Attributes.php b/vendor/fgrosse/phpasn1/lib/X509/CSR/Attributes.php
new file mode 100644
index 0000000..5a965e2
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/CSR/Attributes.php
@@ -0,0 +1,68 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509\CSR;
+
+use FG\ASN1\ASNObject;
+use FG\X509\CertificateExtensions;
+use FG\ASN1\OID;
+use FG\ASN1\Parsable;
+use FG\ASN1\Construct;
+use FG\ASN1\Identifier;
+use FG\ASN1\Universal\Set;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\ObjectIdentifier;
+
+class Attributes extends Construct implements Parsable
+{
+    public function getType()
+    {
+        return 0xA0;
+    }
+
+    public function addAttribute($objectIdentifier, Set $attribute)
+    {
+        if (is_string($objectIdentifier)) {
+            $objectIdentifier = new ObjectIdentifier($objectIdentifier);
+        }
+        $attributeSequence = new Sequence($objectIdentifier, $attribute);
+        $attributeSequence->getNumberOfLengthOctets();  // length and number of length octets is calculated
+        $this->addChild($attributeSequence);
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], 0xA0, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+        $octetsToRead = $contentLength;
+
+        $parsedObject = new self();
+        while ($octetsToRead > 0) {
+            $initialOffset = $offsetIndex; // used to calculate how much bits have been read
+            self::parseIdentifier($binaryData[$offsetIndex], Identifier::SEQUENCE, $offsetIndex++);
+            self::parseContentLength($binaryData, $offsetIndex);
+
+            $objectIdentifier = ObjectIdentifier::fromBinary($binaryData, $offsetIndex);
+            $oidString = $objectIdentifier->getContent();
+            if ($oidString == OID::PKCS9_EXTENSION_REQUEST) {
+                $attribute = CertificateExtensions::fromBinary($binaryData, $offsetIndex);
+            } else {
+                $attribute = ASNObject::fromBinary($binaryData, $offsetIndex);
+            }
+
+            $parsedObject->addAttribute($objectIdentifier, $attribute);
+            $octetsToRead -= ($offsetIndex - $initialOffset);
+        }
+
+        $parsedObject->setContentLength($contentLength);
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/CSR/CSR.php b/vendor/fgrosse/phpasn1/lib/X509/CSR/CSR.php
new file mode 100644
index 0000000..53f9aeb
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/CSR/CSR.php
@@ -0,0 +1,159 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509\CSR;
+
+use FG\ASN1\OID;
+use FG\ASN1\Universal\Integer;
+use FG\ASN1\Universal\BitString;
+use FG\ASN1\Universal\Sequence;
+use FG\X509\CertificateSubject;
+use FG\X509\AlgorithmIdentifier;
+use FG\X509\PublicKey;
+
+class CSR extends Sequence
+{
+    const CSR_VERSION_NR = 0;
+
+    protected $subject;
+    protected $publicKey;
+    protected $signature;
+    protected $signatureAlgorithm;
+
+    protected $startSequence;
+
+    /**
+     * @param string $commonName
+     * @param string $email
+     * @param string $organization
+     * @param string $locality
+     * @param string $state
+     * @param string $country
+     * @param string $organizationalUnit
+     * @param string $publicKey
+     * @param string $signature
+     * @param string $signatureAlgorithm
+     */
+    public function __construct($commonName, $email, $organization, $locality, $state, $country, $organizationalUnit, $publicKey, $signature = null, $signatureAlgorithm = OID::SHA1_WITH_RSA_SIGNATURE)
+    {
+        $this->subject = new CertificateSubject(
+            $commonName,
+            $email,
+            $organization,
+            $locality,
+            $state,
+            $country,
+            $organizationalUnit
+        );
+        $this->publicKey = $publicKey;
+        $this->signature = $signature;
+        $this->signatureAlgorithm = $signatureAlgorithm;
+
+        if (isset($signature)) {
+            $this->createCSRSequence();
+        }
+    }
+
+    protected function createCSRSequence()
+    {
+        $versionNr            = new Integer(self::CSR_VERSION_NR);
+        $publicKey            = new PublicKey($this->publicKey);
+        $signature            = new BitString($this->signature);
+        $signatureAlgorithm    = new AlgorithmIdentifier($this->signatureAlgorithm);
+
+        $certRequestInfo  = new Sequence($versionNr, $this->subject, $publicKey);
+
+        // Clear the underlying Construct
+        $this->rewind();
+        $this->children = [];
+        $this->addChild($certRequestInfo);
+        $this->addChild($signatureAlgorithm);
+        $this->addChild($signature);
+    }
+
+    public function getSignatureSubject()
+    {
+        $versionNr            = new Integer(self::CSR_VERSION_NR);
+        $publicKey            = new PublicKey($this->publicKey);
+
+        $certRequestInfo  = new Sequence($versionNr, $this->subject, $publicKey);
+        return $certRequestInfo->getBinary();
+    }
+
+    public function setSignature($signature, $signatureAlgorithm = OID::SHA1_WITH_RSA_SIGNATURE)
+    {
+        $this->signature = $signature;
+        $this->signatureAlgorithm = $signatureAlgorithm;
+
+        $this->createCSRSequence();
+    }
+
+    public function __toString()
+    {
+        $tmp = base64_encode($this->getBinary());
+
+        for ($i = 0; $i < strlen($tmp); $i++) {
+            if (($i + 2) % 65 == 0) {
+                $tmp = substr($tmp, 0, $i + 1)."\n".substr($tmp, $i + 1);
+            }
+        }
+
+        $result = '-----BEGIN CERTIFICATE REQUEST-----'.PHP_EOL;
+        $result .= $tmp.PHP_EOL;
+        $result .= '-----END CERTIFICATE REQUEST-----';
+
+        return $result;
+    }
+
+    public function getVersion()
+    {
+        return self::CSR_VERSION_NR;
+    }
+
+    public function getOrganizationName()
+    {
+        return $this->subject->getOrganization();
+    }
+
+    public function getLocalName()
+    {
+        return $this->subject->getLocality();
+    }
+
+    public function getState()
+    {
+        return $this->subject->getState();
+    }
+
+    public function getCountry()
+    {
+        return $this->subject->getCountry();
+    }
+
+    public function getOrganizationalUnit()
+    {
+        return $this->subject->getOrganizationalUnit();
+    }
+
+    public function getPublicKey()
+    {
+        return $this->publicKey;
+    }
+
+    public function getSignature()
+    {
+        return $this->signature;
+    }
+
+    public function getSignatureAlgorithm()
+    {
+        return $this->signatureAlgorithm;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/CertificateExtensions.php b/vendor/fgrosse/phpasn1/lib/X509/CertificateExtensions.php
new file mode 100644
index 0000000..6ed1c6a
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/CertificateExtensions.php
@@ -0,0 +1,100 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509;
+
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\OID;
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Universal\OctetString;
+use FG\ASN1\Universal\Set;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\ObjectIdentifier;
+use FG\X509\SAN\SubjectAlternativeNames;
+
+class CertificateExtensions extends Set implements Parsable
+{
+    private $innerSequence;
+    private $extensions = [];
+
+    public function __construct()
+    {
+        $this->innerSequence = new Sequence();
+        parent::__construct($this->innerSequence);
+    }
+
+    public function addSubjectAlternativeNames(SubjectAlternativeNames $sans)
+    {
+        $this->addExtension(OID::CERT_EXT_SUBJECT_ALT_NAME, $sans);
+    }
+
+    private function addExtension($oidString, ASNObject $extension)
+    {
+        $sequence = new Sequence();
+        $sequence->addChild(new ObjectIdentifier($oidString));
+        $sequence->addChild($extension);
+
+        $this->innerSequence->addChild($sequence);
+        $this->extensions[] = $extension;
+    }
+
+    public function getContent()
+    {
+        return $this->extensions;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::SET, $offsetIndex++);
+        self::parseContentLength($binaryData, $offsetIndex);
+
+        $tmpOffset = $offsetIndex;
+        $extensions = Sequence::fromBinary($binaryData, $offsetIndex);
+        $tmpOffset += 1 + $extensions->getNumberOfLengthOctets();
+
+        $parsedObject = new self();
+        foreach ($extensions as $extension) {
+            if ($extension->getType() != Identifier::SEQUENCE) {
+                //FIXME wrong offset index
+                throw new ParserException('Could not parse Certificate Extensions: Expected ASN.1 Sequence but got '.$extension->getTypeName(), $offsetIndex);
+            }
+
+            $tmpOffset += 1 + $extension->getNumberOfLengthOctets();
+            $children = $extension->getChildren();
+            if (count($children) < 2) {
+                throw new ParserException('Could not parse Certificate Extensions: Needs at least two child elements per extension sequence (object identifier and octet string)', $tmpOffset);
+            }
+            /** @var \FG\ASN1\ASNObject $objectIdentifier */
+            $objectIdentifier = $children[0];
+
+            /** @var OctetString $octetString */
+            $octetString = $children[1];
+
+            if ($objectIdentifier->getType() != Identifier::OBJECT_IDENTIFIER) {
+                throw new ParserException('Could not parse Certificate Extensions: Expected ASN.1 Object Identifier but got '.$extension->getTypeName(), $tmpOffset);
+            }
+
+            $tmpOffset += $objectIdentifier->getObjectLength();
+
+            if ($objectIdentifier->getContent() == OID::CERT_EXT_SUBJECT_ALT_NAME) {
+                $sans = SubjectAlternativeNames::fromBinary($binaryData, $tmpOffset);
+                $parsedObject->addSubjectAlternativeNames($sans);
+            } else {
+                // can now only parse SANs. There might be more in the future
+                $tmpOffset += $octetString->getObjectLength();
+            }
+        }
+
+        $parsedObject->getBinary(); // Determine the number of content octets and object sizes once (just to let the equality unit tests pass :/ )
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/CertificateSubject.php b/vendor/fgrosse/phpasn1/lib/X509/CertificateSubject.php
new file mode 100644
index 0000000..0a04d57
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/CertificateSubject.php
@@ -0,0 +1,108 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509;
+
+use FG\ASN1\Composite\RelativeDistinguishedName;
+use FG\ASN1\Identifier;
+use FG\ASN1\OID;
+use FG\ASN1\Parsable;
+use FG\ASN1\Composite\RDNString;
+use FG\ASN1\Universal\Sequence;
+
+class CertificateSubject extends Sequence implements Parsable
+{
+    private $commonName;
+    private $email;
+    private $organization;
+    private $locality;
+    private $state;
+    private $country;
+    private $organizationalUnit;
+
+    /**
+     * @param string $commonName
+     * @param string $email
+     * @param string $organization
+     * @param string $locality
+     * @param string $state
+     * @param string $country
+     * @param string $organizationalUnit
+     */
+    public function __construct($commonName, $email, $organization, $locality, $state, $country, $organizationalUnit)
+    {
+        parent::__construct(
+            new RDNString(OID::COUNTRY_NAME, $country),
+            new RDNString(OID::STATE_OR_PROVINCE_NAME, $state),
+            new RDNString(OID::LOCALITY_NAME, $locality),
+            new RDNString(OID::ORGANIZATION_NAME, $organization),
+            new RDNString(OID::OU_NAME, $organizationalUnit),
+            new RDNString(OID::COMMON_NAME, $commonName),
+            new RDNString(OID::PKCS9_EMAIL, $email)
+        );
+
+        $this->commonName = $commonName;
+        $this->email = $email;
+        $this->organization = $organization;
+        $this->locality = $locality;
+        $this->state = $state;
+        $this->country = $country;
+        $this->organizationalUnit = $organizationalUnit;
+    }
+
+    public function getCommonName()
+    {
+        return $this->commonName;
+    }
+
+    public function getEmail()
+    {
+        return $this->email;
+    }
+
+    public function getOrganization()
+    {
+        return $this->organization;
+    }
+
+    public function getLocality()
+    {
+        return $this->locality;
+    }
+
+    public function getState()
+    {
+        return $this->state;
+    }
+
+    public function getCountry()
+    {
+        return $this->country;
+    }
+
+    public function getOrganizationalUnit()
+    {
+        return $this->organizationalUnit;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::SEQUENCE, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+
+        $names = [];
+        $octetsToRead = $contentLength;
+        while ($octetsToRead > 0) {
+            $relativeDistinguishedName = RelativeDistinguishedName::fromBinary($binaryData, $offsetIndex);
+            $octetsToRead -= $relativeDistinguishedName->getObjectLength();
+            $names[] = $relativeDistinguishedName;
+        }
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/PrivateKey.php b/vendor/fgrosse/phpasn1/lib/X509/PrivateKey.php
new file mode 100644
index 0000000..d57ad86
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/PrivateKey.php
@@ -0,0 +1,35 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509;
+
+use FG\ASN1\OID;
+use FG\ASN1\Universal\NullObject;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\BitString;
+use FG\ASN1\Universal\ObjectIdentifier;
+
+class PrivateKey extends Sequence
+{
+    /**
+     * @param string $hexKey
+     * @param \FG\ASN1\ASNObject|string $algorithmIdentifierString
+     */
+    public function __construct($hexKey, $algorithmIdentifierString = OID::RSA_ENCRYPTION)
+    {
+        parent::__construct(
+            new Sequence(
+                new ObjectIdentifier($algorithmIdentifierString),
+                new NullObject()
+            ),
+            new BitString($hexKey)
+        );
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/PublicKey.php b/vendor/fgrosse/phpasn1/lib/X509/PublicKey.php
new file mode 100644
index 0000000..ab8b451
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/PublicKey.php
@@ -0,0 +1,35 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509;
+
+use FG\ASN1\OID;
+use FG\ASN1\Universal\NullObject;
+use FG\ASN1\Universal\Sequence;
+use FG\ASN1\Universal\BitString;
+use FG\ASN1\Universal\ObjectIdentifier;
+
+class PublicKey extends Sequence
+{
+    /**
+     * @param string $hexKey
+     * @param \FG\ASN1\ASNObject|string $algorithmIdentifierString
+     */
+    public function __construct($hexKey, $algorithmIdentifierString = OID::RSA_ENCRYPTION)
+    {
+        parent::__construct(
+            new Sequence(
+                new ObjectIdentifier($algorithmIdentifierString),
+                new NullObject()
+            ),
+            new BitString($hexKey)
+        );
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/SAN/DNSName.php b/vendor/fgrosse/phpasn1/lib/X509/SAN/DNSName.php
new file mode 100644
index 0000000..502738b
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/SAN/DNSName.php
@@ -0,0 +1,28 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509\SAN;
+
+use FG\ASN1\Universal\GeneralString;
+
+class DNSName extends GeneralString
+{
+    const IDENTIFIER = 0x82; // not sure yet why this is the identifier used in SAN extensions
+
+    public function __construct($dnsNameString)
+    {
+        parent::__construct($dnsNameString);
+    }
+
+    public function getType()
+    {
+        return self::IDENTIFIER;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/SAN/IPAddress.php b/vendor/fgrosse/phpasn1/lib/X509/SAN/IPAddress.php
new file mode 100644
index 0000000..f55be95
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/SAN/IPAddress.php
@@ -0,0 +1,73 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509\SAN;
+
+use FG\ASN1\ASNObject;
+use FG\ASN1\Parsable;
+use FG\ASN1\Exception\ParserException;
+
+class IPAddress extends ASNObject implements Parsable
+{
+    const IDENTIFIER = 0x87; // not sure yet why this is the identifier used in SAN extensions
+
+    /** @var string */
+    private $value;
+
+    public function __construct($ipAddressString)
+    {
+        $this->value = $ipAddressString;
+    }
+
+    public function getType()
+    {
+        return self::IDENTIFIER;
+    }
+
+    public function getContent()
+    {
+        return $this->value;
+    }
+
+    protected function calculateContentLength()
+    {
+        return 4;
+    }
+
+    protected function getEncodedValue()
+    {
+        $ipParts = explode('.', $this->value);
+        $binary  = chr($ipParts[0]);
+        $binary .= chr($ipParts[1]);
+        $binary .= chr($ipParts[2]);
+        $binary .= chr($ipParts[3]);
+
+        return $binary;
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], self::IDENTIFIER, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+        if ($contentLength != 4) {
+            throw new ParserException("A FG\\X509\SAN\IPAddress should have a content length of 4. Extracted length was {$contentLength}", $offsetIndex);
+        }
+
+        $ipAddressString = ord($binaryData[$offsetIndex++]).'.';
+        $ipAddressString .= ord($binaryData[$offsetIndex++]).'.';
+        $ipAddressString .= ord($binaryData[$offsetIndex++]).'.';
+        $ipAddressString .= ord($binaryData[$offsetIndex++]);
+
+        $parsedObject = new self($ipAddressString);
+        $parsedObject->getObjectLength();
+
+        return $parsedObject;
+    }
+}
diff --git a/vendor/fgrosse/phpasn1/lib/X509/SAN/SubjectAlternativeNames.php b/vendor/fgrosse/phpasn1/lib/X509/SAN/SubjectAlternativeNames.php
new file mode 100644
index 0000000..271ddde
--- /dev/null
+++ b/vendor/fgrosse/phpasn1/lib/X509/SAN/SubjectAlternativeNames.php
@@ -0,0 +1,96 @@
+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * Copyright © Friedrich Große <friedrich.grosse@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\X509\SAN;
+
+use FG\ASN1\Exception\ParserException;
+use FG\ASN1\ASNObject;
+use FG\ASN1\OID;
+use FG\ASN1\Parsable;
+use FG\ASN1\Identifier;
+use FG\ASN1\Universal\Sequence;
+
+/**
+ * See section 8.3.2.1 of ITU-T X.509.
+ */
+class SubjectAlternativeNames extends ASNObject implements Parsable
+{
+    private $alternativeNamesSequence;
+
+    public function __construct()
+    {
+        $this->alternativeNamesSequence = new Sequence();
+    }
+
+    protected function calculateContentLength()
+    {
+        return $this->alternativeNamesSequence->getObjectLength();
+    }
+
+    public function getType()
+    {
+        return Identifier::OCTETSTRING;
+    }
+
+    public function addDomainName(DNSName $domainName)
+    {
+        $this->alternativeNamesSequence->addChild($domainName);
+    }
+
+    public function addIP(IPAddress $ip)
+    {
+        $this->alternativeNamesSequence->addChild($ip);
+    }
+
+    public function getContent()
+    {
+        return $this->alternativeNamesSequence->getContent();
+    }
+
+    protected function getEncodedValue()
+    {
+        return $this->alternativeNamesSequence->getBinary();
+    }
+
+    public static function fromBinary(&$binaryData, &$offsetIndex = 0)
+    {
+        self::parseIdentifier($binaryData[$offsetIndex], Identifier::OCTETSTRING, $offsetIndex++);
+        $contentLength = self::parseContentLength($binaryData, $offsetIndex);
+
+        if ($contentLength < 2) {
+            throw new ParserException('Can not parse Subject Alternative Names: The Sequence within the octet string after the Object identifier '.OID::CERT_EXT_SUBJECT_ALT_NAME." is too short ({$contentLength} octets)", $offsetIndex);
+        }
+
+        $offsetOfSequence = $offsetIndex;
+        $sequence = Sequence::fromBinary($binaryData, $offsetIndex);
+        $offsetOfSequence += $sequence->getNumberOfLengthOctets() + 1;
+
+        if ($sequence->getObjectLength() != $contentLength) {
+            throw new ParserException('Can not parse Subject Alternative Names: The Sequence length does not match the length of the surrounding octet string', $offsetIndex);
+        }
+
+        $parsedObject = new self();
+        /** @var \FG\ASN1\ASNObject $object */
+        foreach ($sequence as $object) {
+            if ($object->getType() == DNSName::IDENTIFIER) {
+                $domainName = DNSName::fromBinary($binaryData, $offsetOfSequence);
+                $parsedObject->addDomainName($domainName);
+            } elseif ($object->getType() == IPAddress::IDENTIFIER) {
+                $ip = IPAddress::fromBinary($binaryData, $offsetOfSequence);
+                $parsedObject->addIP($ip);
+            } else {
+                throw new ParserException('Could not parse Subject Alternative Name: Only DNSName and IP SANs are currently supported', $offsetIndex);
+            }
+        }
+
+        $parsedObject->getBinary(); // Determine the number of content octets and object sizes once (just to let the equality unit tests pass :/ )
+        return $parsedObject;
+    }
+}