package org.uic.barcode.staticFrame;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.PublicKey;
import java.security.Security;
import java.security.Signature;
import java.security.SignatureException;
import java.security.Provider.Service;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
import org.uic.ticket.EncodingFormatException;
/**
* The Class StaticHeader implements the static bar code header frame defined in UIC IRS 90918-9.
* It allows to decode and encode the bar code content and to add sub-records as defined in the IRS 90918-9 for:
* - additional header data
* - Ticket Layout content
* - Flexible content
* - bilateral data records
*/
public class StaticFrame {
/** The additional header record. */
private UHEADDataRecord headerRecord;
/** The bar code version. */
private int version;
/** The u_flex. */
private UFLEXDataRecord uFlex;
/** The u_tlay. */
private UTLAYDataRecord uTlay;
/** The security provider. */
private String securityProvider;
/** The signature key. */
private String signatureKey;
/** The signature. */
private byte[] signature;
/** The data records. */
private ArrayList<DataRecord> dataRecords = new ArrayList<DataRecord>();
private byte[] signedData = null;
/**
* Instantiates a new static header frame.
*/
public StaticFrame (){ }
/**
* Instantiates a new static header and decodes the provided data.
*
* @param bytes the bar code data
* @throws EncodingFormatException the encoding format exception
* @throws DataFormatException the data format exception
* @throws IOException Signals that an I/O exception has occurred.
*/
public StaticFrame (byte[] bytes) throws EncodingFormatException, DataFormatException, IOException{
decode(bytes);
}
/**
* Encode the barcode data.
*
* @param version the barcode version
* @return byte[] the encoded data as
* @throws IOException Signals that an I/O exception has occurred.
* @throws Exception the exception
*/
/*
* creates a UIC bar code of version 1
*
* limits:
* - version 1 allows for signatures up to 50 byte length
* - max data length 2048 Byte
* input:
* data to be included
* provider of the signature
* processing:
* 1. create header informations
* 2. compression of the data content
* 3. adding a signature
* output:
* raw data to be included in an aztec bar code
*
*/
public byte[] encode() throws IOException, Exception {
if (headerRecord == null && uFlex == null && uTlay == null
&& (dataRecords == null || dataRecords.isEmpty())) return null;
if (signedData == null) {
signedData = encodeData();
}
if (version != 1 && version != 2) {
throw (new Exception(String.format("UIC Barcode Version %d not supported", version)));
}
if (signedData.length < 1) {
throw new IOException("data missing!");
}
if (signedData.length > 2048) {
throw new IOException("too many data!"); //2048 should be enough
}
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
//UIC bar code version 1
String header = "#UT01";
if (version == 2) {
header = "#UT02";
}
outputStream.write(header.getBytes());
outputStream.write(securityProvider.getBytes());
while (signatureKey.length() < 5) {
signatureKey = "0" + signatureKey;
}
outputStream.write(signatureKey.getBytes());
if (signature.length < 1) {
// signature too small for bar code version 1
throw new IOException("signature size too small!");
}
if (version == 1) {
if (signature.length > 50) {
// signature too large for bar code version 1
throw new IOException("signature size too large!");
}
outputStream.write(Arrays.copyOfRange(signature, 0, 50));
} else if (version == 2) {
BigInteger[] bInts = null;
byte zeroByte = 0;
bInts = decodeSignatureIntegerSequence(signature);
byte[] r = toUnsignedBytes(bInts[0]);
byte[] s = toUnsignedBytes(bInts[1]);
if (r.length > 32 || s.length > 32) {
throw (new EncodingFormatException(String.format("DSA signature too big")));
}
for (int i = 0; i < 32 - r.length; i++) {
outputStream.write(zeroByte);
}
outputStream.write(r);
for (int i = 0; i < 32 - s.length; i++) {
outputStream.write(zeroByte);
}
outputStream.write(s);
//outputStream.write(Arrays.copyOfRange(signature, 0, 64));
}
String length = String.format("%04d", signedData.length);
outputStream.write(length.getBytes());
outputStream.write(signedData);
outputStream.close();
return outputStream.toByteArray();
}
/**
* Adds a proprietary data record.
*
* @param record the record
*/
public void addDataRecord(DataRecord record) {
dataRecords.add(record);
}
/**
* Gets the version of the header frame.
*
* @return the version
*/
public int getVersion() {
return version;
}
/**
* Sets the version of the header frame.
* supported values are 1 and 2
*
* @param version the new version
*/
public void setVersion(int version) {
this.version = version;
}
/**
* Gets the security provider.
*
* @return the security provider
*/
public String getSecurityProvider() {
return securityProvider;
}
/**
* Sets the security provider.
*
* @param securityProvider the new security provider
*/
public void setSecurityProvider(String securityProvider) {
this.securityProvider = securityProvider;
}
/**
* Gets the signature key identifier.
*
* @return the signature key
*/
public String getSignatureKey() {
return signatureKey;
}
/**
* Sets the signature key identifier.
*
* @param signatureKey the new signature key
*/
public void setSignatureKey(String signatureKey) {
this.signatureKey = signatureKey;
}
/**
* Gets the signature.
*
* @return the signature
*/
public byte[] getSignature() {
return signature;
}
/**
* Sets the signature.
*
* @param signature the new signature
*/
public void setSignature(byte[] signature) {
this.signature = signature;
}
/**
* Gets the additional header record.
*
* @return the header record
*/
public UHEADDataRecord getHeaderRecord() {
return headerRecord;
}
/**
* Gets the list of bilateral data records.
*
* @return the data records
*/
public ArrayList<DataRecord> getDataRecords() {
return dataRecords;
}
/**
* Gets the data for signing.
*
* @return the data to be signed
* @throws IOException Signals that an I/O exception has occurred.
* @throws EncodingFormatException the encoding format exception
*/
public byte[] getDataForSignature() throws IOException, EncodingFormatException {
// data compression
if (signedData != null) return signedData;
Deflater deflater = new Deflater();
byte[] data = encodeData();
deflater.setInput(data);
ByteArrayOutputStream compressStream = new ByteArrayOutputStream(data.length);
byte[] buffer = new byte[2048];
deflater.finish();
while (!deflater.finished()) {
int count = deflater.deflate(buffer); // returns the number of result bytes
compressStream.write(buffer, 0, count);
}
compressStream.close();
return compressStream.toByteArray();
}
/**
* Get the encoded data for the bar code.
*
* @return the byte[]
* @throws IOException Signals that an I/O exception has occurred.
* @throws EncodingFormatException the encoding format exception
*/
private byte[] encodeData() throws IOException, EncodingFormatException {
if (this.uFlex == null && this.uTlay == null && this.headerRecord == null &&
(dataRecords == null || dataRecords.isEmpty())) return null;
ByteArrayOutputStream totalStream = new ByteArrayOutputStream();
//encode header for layout
if (headerRecord != null) {
byte[] header = headerRecord.encode();
if (header != null && header.length > 0) {
totalStream.write(header);
}
}
//encode layout
if (uTlay != null) {
byte[] layout = uTlay.encode();
if (layout != null && layout.length > 0) {
totalStream.write(layout);
}
}
if (uFlex != null) {
byte[] content = uFlex.encode();
if (content != null && content.length > 0){
totalStream.write(content);
}
}
//third party content
for (DataRecord dataRecord : dataRecords){
byte[] content = dataRecord.encode();
if (content != null && content.length > 0){
totalStream.write(content);
}
}
return totalStream.toByteArray();
}
/**
* Encode signature integer sequence.
*
* Support function to format two parameters as DER encoded integer list
* to get a valid formated DSA signature from the signature parameter
*
* @param i1 the i 1
* @param i2 the i 2
* @return the byte[]
* @throws IOException Signals that an I/O exception has occurred.
*/
public static byte[] encodeSignatureIntegerSequence(BigInteger i1, BigInteger i2) throws IOException {
//SEQUENCE OF --> tag 16
int sequenceTag = 16 + 32; // (bits 6 = 1 constructed)
//INTEGER --> tag 2
int integerTag = 2;
byte[] b1 = toUnsignedBytes(i1);
int lb1 = b1.length;
byte[] b2 = toUnsignedBytes(i2);
int lb2 = b2.length;
int sequenceLength = lb1 + lb2 + 4;
ByteArrayOutputStream out = new ByteArrayOutputStream();
out.write((byte) sequenceTag);
out.write((byte) sequenceLength);
out.write((byte) integerTag);
out.write((byte) lb1);
out.write(b1);
out.write((byte) integerTag);
out.write((byte) lb2);
out.write(b2);
return out.toByteArray();
}
/**
* Decode signature integer sequence.
*
* Support function to decode a DSA signature
* Provides the two DSA signature parameter encoded in a DSA signature
*
* @param bytes the bytes
* @return the big integer[]
* @throws Exception the exception
*/
public static BigInteger[] decodeSignatureIntegerSequence(byte[] bytes) throws Exception {
int sequenceTag = (int) bytes[0];
if (sequenceTag != 48) throw new Exception("signature is not a sequence");
int sequenceLength = (int) bytes[1];
if (sequenceLength < 6) throw new Exception("signature sequence too short");
BigInteger[] result = new BigInteger[2];
int offset = 2;
int i = 0;
while (offset < bytes.length && i < 2) {
int integerTag = (int) bytes[offset];
if (integerTag != 2) throw new Exception("signature is not an integer sequence");
int integerLength = (int) bytes[offset + 1];
byte[] value = Arrays.copyOfRange(bytes, offset + 2, offset + 2 + integerLength);
result[i] = new BigInteger(+1, value);
offset = offset + integerLength + 2;
i++;
}
return result;
}
/**
* Decode.
*
* @param inputData the input data
* @throws EncodingFormatException the encoding format exception
* @throws DataFormatException the data format exception
* @throws IOException Signals that an I/O exception has occurred.
*/
public void decode(byte[] inputData) throws EncodingFormatException, DataFormatException, IOException {
int offset = 0;
String headerTag = new String( Arrays.copyOfRange(inputData,offset,offset + 3));
offset = offset + 3;
if (!headerTag.equals("#UT")) {
throw (new EncodingFormatException("not a UIC barcode"));
}
String versionValue = new String(Arrays.copyOfRange(inputData,offset,offset + 2));
offset = offset + 2;
int barcodeVersion = 0;
try {
barcodeVersion = Integer.parseInt(versionValue);
this.setVersion(barcodeVersion);
} catch (NumberFormatException e2) {
throw (new EncodingFormatException(String.format("UIC Barcode Version %s not supported", versionValue)));
}
String providerValue = new String( Arrays.copyOfRange(inputData,offset,offset + 4));
this.setSecurityProvider(providerValue);
offset = offset + 4;
String signatureKeyIdValue = new String( Arrays.copyOfRange(inputData,offset,offset + 5));
this.setSignatureKey(signatureKeyIdValue);
offset = offset + 5;
byte[] sealdata = null;
if (barcodeVersion == 1) {
sealdata = Arrays.copyOfRange(inputData, offset, offset + 50);
signature = trimDsaSignature(sealdata);
offset = offset + 50;
} else if (barcodeVersion == 2) {
sealdata = Arrays.copyOfRange(inputData, offset, offset + 64);
signature = recombineDsaSignature(sealdata);
offset = offset + 64;
} else {
throw (new EncodingFormatException(String.format("UIC Barcode Version %s not supported", versionValue)));
}
String lengthValue = new String( Arrays.copyOfRange(inputData,offset,offset + 4));
offset = offset + 4;
int dataLength = 0;
dataLength = Integer.parseInt(lengthValue);
signedData = Arrays.copyOfRange(inputData, offset, offset + dataLength);
ByteBuffer containedDataBuffer = ByteBuffer.allocate(dataLength);
containedDataBuffer.put(signedData);
byte[] inflatedDataBuffer = new byte[2000];
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
Inflater inflater = new Inflater();
byte[] inflaterInput = containedDataBuffer.array();
inflater.setInput(inflaterInput);
while (!inflater.finished()) {
int count = inflater.inflate(inflatedDataBuffer,0,2000);
if (inflater.needsDictionary()) {
break;
}
outputStream.write(inflatedDataBuffer, 0, count);
}
outputStream.close();
byte[] byteData = outputStream.toByteArray();
offset = 0;
int remainingBytes = byteData.length;
while (remainingBytes > 0) {
String tag = new String(Arrays.copyOfRange(byteData, offset, offset + 6));
int length = 0;
if (tag.startsWith("U_TLAY")) {
UTLAYDataRecord record = new UTLAYDataRecord();
length = record.decode(Arrays.copyOfRange(byteData, offset, byteData.length));
this.uTlay = record;
} else if (tag.startsWith("U_FLEX")) {
UFLEXDataRecord record = new UFLEXDataRecord();
length = record.decode(Arrays.copyOfRange(byteData, offset, byteData.length));
this.uFlex = record;
} else if (tag.startsWith("U_HEAD")) {
UHEADDataRecord record = new UHEADDataRecord();
length = record.decode(Arrays.copyOfRange(byteData, offset, byteData.length));
this.headerRecord = record;
} else {
DataRecord record = new GENERICDataRecord(tag);
length = record.decode(Arrays.copyOfRange(byteData, offset, byteData.length));
addDataRecord(record);
}
offset = offset + length;
remainingBytes = remainingBytes - length;
}
}
private byte[] recombineDsaSignature(byte[] sealdata) throws IOException {
//check whether the encoding is wrong and the sealdata contain a signature
//remove trailing zeroes from the signature
BigInteger[] bInts = null;
try {
bInts = decodeSignatureIntegerSequence(sealdata);
byte[] sig = encodeSignatureIntegerSequence(bInts[0],bInts[1]);
//decoding the entire signature was ok, so there was no split
return sig;
} catch (Exception e) {
//the signature is correctly implemented, continue with recombination
}
// split the data into two blocks
int length = sealdata.length / 2;
byte[] rBytes = Arrays.copyOfRange(sealdata, 0, length);
byte[] sBytes = Arrays.copyOfRange(sealdata, length, length + length);
//convert to BigInteger to get rid of leading zeroes
BigInteger r = new BigInteger(1,rBytes);
BigInteger s = new BigInteger(1,sBytes);
//encode as DSA signature structure
//SEQUENCE OF --> tag 16
int sequenceTag = 16 + 32; // (bits 6 = 1 constructed)
//INTEGER --> tag 2
int integerTag = 2;
byte[] b1 = toUnsignedBytes(r);
int lb1 = b1.length;
byte[] b2 = toUnsignedBytes(s);
int lb2 = b2.length;
int sequenceLength = lb1 + lb2 + 4;
ByteArrayOutputStream out = new ByteArrayOutputStream();
out.write((byte) sequenceTag);
out.write((byte) sequenceLength);
out.write((byte) integerTag);
out.write((byte) lb1);
out.write(b1);
out.write((byte) integerTag);
out.write((byte) lb2);
out.write(b2);
return out.toByteArray();
}
private static byte[] toUnsignedBytes(BigInteger i) {
byte[] b = i.abs().toByteArray();
//remove top sign bit
if (b[0] == 0) {
b = Arrays.copyOfRange(b, 1, b.length);
}
return b;
}
private byte[] trimDsaSignature(byte[] sealdata) throws EncodingFormatException {
//remove trailing zeroes from the signature
BigInteger[] bInts = null;
try {
bInts = decodeSignatureIntegerSequence(sealdata);
return encodeSignatureIntegerSequence(bInts[0],bInts[1]);
} catch (Exception e) {
throw (new EncodingFormatException(String.format("Invalid DSA signature")));
}
}
/**
* Verify the signature
*
* Note: an appropriate security provider (e.g. BC) must be registered before
*
* @param key the key
* @param algo the algorithm name
* @return true, if successful
* @throws InvalidKeyException the invalid key exception
* @throws NoSuchAlgorithmException the no such algorithm exception
* @throws SignatureException the signature exception
* @throws IllegalArgumentException the illegal argument exception
* @throws UnsupportedOperationException the unsupported operation exception
* @throws EncodingFormatException
* @throws IOException
*/
public boolean ByAlgorithmName(PublicKey key, String algo) throws InvalidKeyException, NoSuchAlgorithmException, SignatureException, IllegalArgumentException, UnsupportedOperationException, IOException, EncodingFormatException {
Signature sig = Signature.getInstance(algo);
sig.initVerify(key);
sig.update(this.getDataForSignature());
return sig.verify(this.getSignature());
}
/**
* Verify the signature
*
* Note: an appropriate security provider (e.g. BC) must be registered before
*
* @param key the key
* @param singningAlg the Object ID of the signing algorithm
* @return true, if successful
* @throws InvalidKeyException the invalid key exception
* @throws NoSuchAlgorithmException the no such algorithm exception
* @throws SignatureException the signature exception
* @throws IllegalArgumentException the illegal argument exception
* @throws UnsupportedOperationException the unsupported operatign exception
* @throws EncodingFormatException
* @throws IOException
*/
public boolean verifyByAlgorithmOid(PublicKey key, String signingAlg) throws InvalidKeyException, NoSuchAlgorithmException, SignatureException, IllegalArgumentException, UnsupportedOperationException, IOException, EncodingFormatException {
//find the algorithm name for the signature OID
String algo = null;
Provider[] provs = Security.getProviders();
for (Provider prov : provs) {
Service service = prov.getService("Signature",signingAlg);
if (service != null) {
algo = service.getAlgorithm();
}
}
Signature sig = Signature.getInstance(algo);
sig.initVerify(key);
sig.update(getDataForSignature());
return sig.verify(this.getSignature());
}
/**
* Sign the contained data block.
*
* Note: an appropriate security provider (e.g. BC) must be registered before
*
* @param key the key
* @param singningAlg the Object ID of the signing algorithm
* @return
* @throws NoSuchAlgorithmException the no such algorithm exception
* @throws InvalidKeyException the invalid key exception
* @throws SignatureException the signature exception
* @throws EncodingFormatException
* @throws IOException
*/
public void signByAlgorithmOID(PrivateKey key,String signingAlg) throws NoSuchAlgorithmException, InvalidKeyException, SignatureException, IOException, EncodingFormatException {
//find the algorithm name for the signature OID
String algo = null;
Provider[] provs = Security.getProviders();
for (Provider prov : provs) {
Service service = prov.getService("Signature",signingAlg);
if (service != null) {
algo = service.getAlgorithm();
}
}
Signature sig = Signature.getInstance(algo);
sig.initSign(key);
signedData = getDataForSignature();
sig.update(signedData);
signature = sig.sign();
}
/**
* Sign the contained data block.
*
* Note: an appropriate security provider (e.g. BC) must be registered before
*
* @param key the key
* @param algo the name of the signing algorithm
* @return
* @throws NoSuchAlgorithmException the no such algorithm exception
* @throws InvalidKeyException the invalid key exception
* @throws SignatureException the signature exception
* @throws EncodingFormatException
* @throws IOException
*/
public void signUsingAlgorithmName(PrivateKey key,String algo) throws NoSuchAlgorithmException, InvalidKeyException, SignatureException, IOException, EncodingFormatException {
Signature sig = Signature.getInstance(algo);
sig.initSign(key);
sig.update(getDataForSignature());
signature = sig.sign();
}
public UFLEXDataRecord getuFlex() {
return uFlex;
}
public UTLAYDataRecord getuTlay() {
return uTlay;
}
public void setuFlex(UFLEXDataRecord uFlex) {
this.uFlex = uFlex;
}
public void setuTlay(UTLAYDataRecord uTlay) {
this.uTlay = uTlay;
}
public void setHeaderRecord(UHEADDataRecord headerRecord) {
this.headerRecord = headerRecord;
}
}
