diff options
Diffstat (limited to 'vendor/paragonie/sodium_compat/src/Core32/ChaCha20/Ctx.php')
-rw-r--r-- | vendor/paragonie/sodium_compat/src/Core32/ChaCha20/Ctx.php | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/vendor/paragonie/sodium_compat/src/Core32/ChaCha20/Ctx.php b/vendor/paragonie/sodium_compat/src/Core32/ChaCha20/Ctx.php new file mode 100644 index 0000000..3f47d03 --- /dev/null +++ b/vendor/paragonie/sodium_compat/src/Core32/ChaCha20/Ctx.php @@ -0,0 +1,126 @@ +<?php + +if (class_exists('ParagonIE_Sodium_Core_ChaCha20_Ctx', false)) { + return; +} + +/** + * Class ParagonIE_Sodium_Core32_ChaCha20_Ctx + */ +class ParagonIE_Sodium_Core32_ChaCha20_Ctx extends ParagonIE_Sodium_Core32_Util implements ArrayAccess +{ + /** + * @var SplFixedArray internally, <int, ParagonIE_Sodium_Core32_Int32> + */ + protected $container; + + /** + * ParagonIE_Sodium_Core_ChaCha20_Ctx constructor. + * + * @internal You should not use this directly from another application + * + * @param string $key ChaCha20 key. + * @param string $iv Initialization Vector (a.k.a. nonce). + * @param string $counter The initial counter value. + * Defaults to 8 0x00 bytes. + * @throws InvalidArgumentException + * @throws SodiumException + * @throws TypeError + */ + public function __construct($key = '', $iv = '', $counter = '') + { + if (self::strlen($key) !== 32) { + throw new InvalidArgumentException('ChaCha20 expects a 256-bit key.'); + } + if (self::strlen($iv) !== 8) { + throw new InvalidArgumentException('ChaCha20 expects a 64-bit nonce.'); + } + $this->container = new SplFixedArray(16); + + /* "expand 32-byte k" as per ChaCha20 spec */ + $this->container[0] = new ParagonIE_Sodium_Core32_Int32(array(0x6170, 0x7865)); + $this->container[1] = new ParagonIE_Sodium_Core32_Int32(array(0x3320, 0x646e)); + $this->container[2] = new ParagonIE_Sodium_Core32_Int32(array(0x7962, 0x2d32)); + $this->container[3] = new ParagonIE_Sodium_Core32_Int32(array(0x6b20, 0x6574)); + + $this->container[4] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 0, 4)); + $this->container[5] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 4, 4)); + $this->container[6] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 8, 4)); + $this->container[7] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 12, 4)); + $this->container[8] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 16, 4)); + $this->container[9] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 20, 4)); + $this->container[10] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 24, 4)); + $this->container[11] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 28, 4)); + + if (empty($counter)) { + $this->container[12] = new ParagonIE_Sodium_Core32_Int32(); + $this->container[13] = new ParagonIE_Sodium_Core32_Int32(); + } else { + $this->container[12] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($counter, 0, 4)); + $this->container[13] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($counter, 4, 4)); + } + $this->container[14] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 0, 4)); + $this->container[15] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 4, 4)); + } + + /** + * @internal You should not use this directly from another application + * + * @param int $offset + * @param int|ParagonIE_Sodium_Core32_Int32 $value + * @return void + */ + public function offsetSet($offset, $value) + { + if (!is_int($offset)) { + throw new InvalidArgumentException('Expected an integer'); + } + if ($value instanceof ParagonIE_Sodium_Core32_Int32) { + /* + } elseif (is_int($value)) { + $value = ParagonIE_Sodium_Core32_Int32::fromInt($value); + */ + } else { + throw new InvalidArgumentException('Expected an integer'); + } + $this->container[$offset] = $value; + } + + /** + * @internal You should not use this directly from another application + * + * @param int $offset + * @return bool + * @psalm-suppress MixedArrayOffset + */ + public function offsetExists($offset) + { + return isset($this->container[$offset]); + } + + /** + * @internal You should not use this directly from another application + * + * @param int $offset + * @return void + * @psalm-suppress MixedArrayOffset + */ + public function offsetUnset($offset) + { + unset($this->container[$offset]); + } + + /** + * @internal You should not use this directly from another application + * + * @param int $offset + * @return mixed|null + * @psalm-suppress MixedArrayOffset + */ + public function offsetGet($offset) + { + return isset($this->container[$offset]) + ? $this->container[$offset] + : null; + } +} |