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package org.spongycastle.openpgp;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.spongycastle.bcpg.BCPGInputStream;
import org.spongycastle.bcpg.BCPGOutputStream;
import org.spongycastle.bcpg.OnePassSignaturePacket;
import org.spongycastle.openpgp.operator.PGPContentVerifier;
import org.spongycastle.openpgp.operator.PGPContentVerifierBuilder;
import org.spongycastle.openpgp.operator.PGPContentVerifierBuilderProvider;
/**
* A one pass signature object.
*/
public class PGPOnePassSignature
{
private OnePassSignaturePacket sigPack;
private int signatureType;
private PGPContentVerifier verifier;
private byte lastb;
private OutputStream sigOut;
PGPOnePassSignature(
BCPGInputStream pIn)
throws IOException, PGPException
{
this((OnePassSignaturePacket)pIn.readPacket());
}
PGPOnePassSignature(
OnePassSignaturePacket sigPack)
throws PGPException
{
this.sigPack = sigPack;
this.signatureType = sigPack.getSignatureType();
}
/**
* Initialise the signature object for verification.
*
* @param verifierBuilderProvider provider for a content verifier builder for the signature type of interest.
* @param pubKey the public key to use for verification
* @throws PGPException if there's an issue with creating the verifier.
*/
public void init(PGPContentVerifierBuilderProvider verifierBuilderProvider, PGPPublicKey pubKey)
throws PGPException
{
PGPContentVerifierBuilder verifierBuilder = verifierBuilderProvider.get(sigPack.getKeyAlgorithm(), sigPack.getHashAlgorithm());
verifier = verifierBuilder.build(pubKey);
lastb = 0;
sigOut = verifier.getOutputStream();
}
public void update(
byte b)
{
if (signatureType == 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[] bytes)
{
if (signatureType == PGPSignature.CANONICAL_TEXT_DOCUMENT)
{
for (int i = 0; i != bytes.length; i++)
{
this.update(bytes[i]);
}
}
else
{
blockUpdate(bytes, 0, bytes.length);
}
}
public void update(
byte[] bytes,
int off,
int length)
{
if (signatureType == PGPSignature.CANONICAL_TEXT_DOCUMENT)
{
int finish = off + length;
for (int i = off; i != finish; i++)
{
this.update(bytes[i]);
}
}
else
{
blockUpdate(bytes, off, length);
}
}
private void byteUpdate(byte b)
{
try
{
sigOut.write(b);
}
catch (IOException e)
{
throw new PGPRuntimeOperationException(e.getMessage(), e);
}
}
private void blockUpdate(byte[] block, int off, int len)
{
try
{
sigOut.write(block, off, len);
}
catch (IOException e)
{
throw new PGPRuntimeOperationException(e.getMessage(), e);
}
}
/**
* Verify the calculated signature against the passed in PGPSignature.
*
* @param pgpSig
* @return boolean
* @throws PGPException
*/
public boolean verify(
PGPSignature pgpSig)
throws PGPException
{
try
{
sigOut.write(pgpSig.getSignatureTrailer());
sigOut.close();
}
catch (IOException e)
{
throw new PGPException("unable to add trailer: " + e.getMessage(), e);
}
return verifier.verify(pgpSig.getSignature());
}
public long getKeyID()
{
return sigPack.getKeyID();
}
public int getSignatureType()
{
return sigPack.getSignatureType();
}
public int getHashAlgorithm()
{
return sigPack.getHashAlgorithm();
}
public int getKeyAlgorithm()
{
return sigPack.getKeyAlgorithm();
}
public byte[] getEncoded()
throws IOException
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
this.encode(bOut);
return bOut.toByteArray();
}
public void encode(
OutputStream outStream)
throws IOException
{
BCPGOutputStream out;
if (outStream instanceof BCPGOutputStream)
{
out = (BCPGOutputStream)outStream;
}
else
{
out = new BCPGOutputStream(outStream);
}
out.writePacket(sigPack);
}
}
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