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package org.spongycastle.openpgp;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigInteger;
import java.util.Date;
import org.spongycastle.bcpg.MPInteger;
import org.spongycastle.bcpg.OnePassSignaturePacket;
import org.spongycastle.bcpg.PublicKeyAlgorithmTags;
import org.spongycastle.bcpg.SignaturePacket;
import org.spongycastle.openpgp.operator.PGPContentSigner;
import org.spongycastle.openpgp.operator.PGPContentSignerBuilder;
/**
* Generator for old style PGP V3 Signatures.
*/
public class PGPV3SignatureGenerator
{
private byte lastb;
private OutputStream sigOut;
private PGPContentSignerBuilder contentSignerBuilder;
private PGPContentSigner contentSigner;
private int sigType;
private int providedKeyAlgorithm = -1;
/**
* Create a signature generator built on the passed in contentSignerBuilder.
*
* @param contentSignerBuilder builder to produce PGPContentSigner objects for generating signatures.
*/
public PGPV3SignatureGenerator(
PGPContentSignerBuilder contentSignerBuilder)
{
this.contentSignerBuilder = contentSignerBuilder;
}
/**
* Initialise the generator for signing.
*
* @param signatureType
* @param key
* @throws PGPException
*/
public void init(
int signatureType,
PGPPrivateKey key)
throws PGPException
{
contentSigner = contentSignerBuilder.build(signatureType, key);
sigOut = contentSigner.getOutputStream();
sigType = contentSigner.getType();
lastb = 0;
if (providedKeyAlgorithm >= 0 && providedKeyAlgorithm != contentSigner.getKeyAlgorithm())
{
throw new PGPException("key algorithm mismatch");
}
}
public void update(
byte b)
{
if (sigType == PGPSignature.CANONICAL_TEXT_DOCUMENT)
{
if (b == '\r')
{
byteUpdate((byte)'\r');
byteUpdate((byte)'\n');
}
else if (b == '\n')
{
if (lastb != '\r')
{
byteUpdate((byte)'\r');
byteUpdate((byte)'\n');
}
}
else
{
byteUpdate(b);
}
lastb = b;
}
else
{
byteUpdate(b);
}
}
public void update(
byte[] b)
{
this.update(b, 0, b.length);
}
public void update(
byte[] b,
int off,
int len)
{
if (sigType == PGPSignature.CANONICAL_TEXT_DOCUMENT)
{
int finish = off + len;
for (int i = off; i != finish; i++)
{
this.update(b[i]);
}
}
else
{
blockUpdate(b, off, len);
}
}
private void byteUpdate(byte b)
{
try
{
sigOut.write(b);
}
catch (IOException e)
{
throw new PGPRuntimeOperationException("unable to update signature: " + e.getMessage(), e);
}
}
private void blockUpdate(byte[] block, int off, int len)
{
try
{
sigOut.write(block, off, len);
}
catch (IOException e)
{
throw new PGPRuntimeOperationException("unable to update signature: " + e.getMessage(), e);
}
}
/**
* Return the one pass header associated with the current signature.
*
* @param isNested
* @return PGPOnePassSignature
* @throws PGPException
*/
public PGPOnePassSignature generateOnePassVersion(
boolean isNested)
throws PGPException
{
return new PGPOnePassSignature(new OnePassSignaturePacket(sigType, contentSigner.getHashAlgorithm(), contentSigner.getKeyAlgorithm(), contentSigner.getKeyID(), isNested));
}
/**
* Return a V3 signature object containing the current signature state.
*
* @return PGPSignature
* @throws PGPException
*/
public PGPSignature generate()
throws PGPException
{
long creationTime = new Date().getTime() / 1000;
ByteArrayOutputStream sOut = new ByteArrayOutputStream();
sOut.write(sigType);
sOut.write((byte)(creationTime >> 24));
sOut.write((byte)(creationTime >> 16));
sOut.write((byte)(creationTime >> 8));
sOut.write((byte)creationTime);
byte[] hData = sOut.toByteArray();
blockUpdate(hData, 0, hData.length);
MPInteger[] sigValues;
if (contentSigner.getKeyAlgorithm() == PublicKeyAlgorithmTags.RSA_SIGN
|| contentSigner.getKeyAlgorithm() == PublicKeyAlgorithmTags.RSA_GENERAL)
// an RSA signature
{
sigValues = new MPInteger[1];
sigValues[0] = new MPInteger(new BigInteger(1, contentSigner.getSignature()));
}
else
{
sigValues = PGPUtil.dsaSigToMpi(contentSigner.getSignature());
}
byte[] digest = contentSigner.getDigest();
byte[] fingerPrint = new byte[2];
fingerPrint[0] = digest[0];
fingerPrint[1] = digest[1];
return new PGPSignature(new SignaturePacket(3, contentSigner.getType(), contentSigner.getKeyID(), contentSigner.getKeyAlgorithm(), contentSigner.getHashAlgorithm(), creationTime * 1000, fingerPrint, sigValues));
}
}
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