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The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API for JDK 1.5. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
package org.bouncycastle.bcpg;
import org.bouncycastle.bcpg.sig.IssuerKeyID;
import org.bouncycastle.bcpg.sig.SignatureCreationTime;
import org.bouncycastle.util.Arrays;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Vector;
/**
* generic signature packet
*/
public class SignaturePacket
extends ContainedPacket implements PublicKeyAlgorithmTags
{
private int version;
private int signatureType;
private long creationTime;
private long keyID;
private int keyAlgorithm;
private int hashAlgorithm;
private MPInteger[] signature;
private byte[] fingerPrint;
private SignatureSubpacket[] hashedData;
private SignatureSubpacket[] unhashedData;
private byte[] signatureEncoding;
SignaturePacket(
BCPGInputStream in)
throws IOException
{
version = in.read();
if (version == 3 || version == 2)
{
int l = in.read();
signatureType = in.read();
creationTime = (((long)in.read() << 24) | (in.read() << 16) | (in.read() << 8) | in.read()) * 1000;
keyID |= (long)in.read() << 56;
keyID |= (long)in.read() << 48;
keyID |= (long)in.read() << 40;
keyID |= (long)in.read() << 32;
keyID |= (long)in.read() << 24;
keyID |= (long)in.read() << 16;
keyID |= (long)in.read() << 8;
keyID |= in.read();
keyAlgorithm = in.read();
hashAlgorithm = in.read();
}
else if (version == 4)
{
signatureType = in.read();
keyAlgorithm = in.read();
hashAlgorithm = in.read();
int hashedLength = (in.read() << 8) | in.read();
byte[] hashed = new byte[hashedLength];
in.readFully(hashed);
//
// read the signature sub packet data.
//
SignatureSubpacket sub;
SignatureSubpacketInputStream sIn = new SignatureSubpacketInputStream(
new ByteArrayInputStream(hashed));
Vector v = new Vector();
while ((sub = sIn.readPacket()) != null)
{
v.addElement(sub);
}
hashedData = new SignatureSubpacket[v.size()];
for (int i = 0; i != hashedData.length; i++)
{
SignatureSubpacket p = (SignatureSubpacket)v.elementAt(i);
if (p instanceof IssuerKeyID)
{
keyID = ((IssuerKeyID)p).getKeyID();
}
else if (p instanceof SignatureCreationTime)
{
creationTime = ((SignatureCreationTime)p).getTime().getTime();
}
hashedData[i] = p;
}
int unhashedLength = (in.read() << 8) | in.read();
byte[] unhashed = new byte[unhashedLength];
in.readFully(unhashed);
sIn = new SignatureSubpacketInputStream(
new ByteArrayInputStream(unhashed));
v.removeAllElements();
while ((sub = sIn.readPacket()) != null)
{
v.addElement(sub);
}
unhashedData = new SignatureSubpacket[v.size()];
for (int i = 0; i != unhashedData.length; i++)
{
SignatureSubpacket p = (SignatureSubpacket)v.elementAt(i);
if (p instanceof IssuerKeyID)
{
keyID = ((IssuerKeyID)p).getKeyID();
}
unhashedData[i] = p;
}
}
else
{
throw new RuntimeException("unsupported version: " + version);
}
fingerPrint = new byte[2];
in.readFully(fingerPrint);
switch (keyAlgorithm)
{
case RSA_GENERAL:
case RSA_SIGN:
MPInteger v = new MPInteger(in);
signature = new MPInteger[1];
signature[0] = v;
break;
case DSA:
MPInteger r = new MPInteger(in);
MPInteger s = new MPInteger(in);
signature = new MPInteger[2];
signature[0] = r;
signature[1] = s;
break;
case ELGAMAL_ENCRYPT: // yep, this really does happen sometimes.
case ELGAMAL_GENERAL:
MPInteger p = new MPInteger(in);
MPInteger g = new MPInteger(in);
MPInteger y = new MPInteger(in);
signature = new MPInteger[3];
signature[0] = p;
signature[1] = g;
signature[2] = y;
break;
default:
if (keyAlgorithm >= PublicKeyAlgorithmTags.EXPERIMENTAL_1 && keyAlgorithm <= PublicKeyAlgorithmTags.EXPERIMENTAL_11)
{
signature = null;
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
int ch;
while ((ch = in.read()) >= 0)
{
bOut.write(ch);
}
signatureEncoding = bOut.toByteArray();
}
else
{
throw new IOException("unknown signature key algorithm: " + keyAlgorithm);
}
}
}
/**
* Generate a version 4 signature packet.
*
* @param signatureType
* @param keyAlgorithm
* @param hashAlgorithm
* @param hashedData
* @param unhashedData
* @param fingerPrint
* @param signature
*/
public SignaturePacket(
int signatureType,
long keyID,
int keyAlgorithm,
int hashAlgorithm,
SignatureSubpacket[] hashedData,
SignatureSubpacket[] unhashedData,
byte[] fingerPrint,
MPInteger[] signature)
{
this(4, signatureType, keyID, keyAlgorithm, hashAlgorithm, hashedData, unhashedData, fingerPrint, signature);
}
/**
* Generate a version 2/3 signature packet.
*
* @param signatureType
* @param keyAlgorithm
* @param hashAlgorithm
* @param fingerPrint
* @param signature
*/
public SignaturePacket(
int version,
int signatureType,
long keyID,
int keyAlgorithm,
int hashAlgorithm,
long creationTime,
byte[] fingerPrint,
MPInteger[] signature)
{
this(version, signatureType, keyID, keyAlgorithm, hashAlgorithm, null, null, fingerPrint, signature);
this.creationTime = creationTime;
}
public SignaturePacket(
int version,
int signatureType,
long keyID,
int keyAlgorithm,
int hashAlgorithm,
SignatureSubpacket[] hashedData,
SignatureSubpacket[] unhashedData,
byte[] fingerPrint,
MPInteger[] signature)
{
this.version = version;
this.signatureType = signatureType;
this.keyID = keyID;
this.keyAlgorithm = keyAlgorithm;
this.hashAlgorithm = hashAlgorithm;
this.hashedData = hashedData;
this.unhashedData = unhashedData;
this.fingerPrint = fingerPrint;
this.signature = signature;
if (hashedData != null)
{
setCreationTime();
}
}
/**
* get the version number
*/
public int getVersion()
{
return version;
}
/**
* return the signature type.
*/
public int getSignatureType()
{
return signatureType;
}
/**
* return the keyID
* @return the keyID that created the signature.
*/
public long getKeyID()
{
return keyID;
}
/**
* return the signature trailer that must be included with the data
* to reconstruct the signature
*
* @return byte[]
*/
public byte[] getSignatureTrailer()
{
byte[] trailer = null;
if (version == 3 || version == 2)
{
trailer = new byte[5];
long time = creationTime / 1000;
trailer[0] = (byte)signatureType;
trailer[1] = (byte)(time >> 24);
trailer[2] = (byte)(time >> 16);
trailer[3] = (byte)(time >> 8);
trailer[4] = (byte)(time);
}
else
{
ByteArrayOutputStream sOut = new ByteArrayOutputStream();
try
{
sOut.write((byte)this.getVersion());
sOut.write((byte)this.getSignatureType());
sOut.write((byte)this.getKeyAlgorithm());
sOut.write((byte)this.getHashAlgorithm());
ByteArrayOutputStream hOut = new ByteArrayOutputStream();
SignatureSubpacket[] hashed = this.getHashedSubPackets();
for (int i = 0; i != hashed.length; i++)
{
hashed[i].encode(hOut);
}
byte[] data = hOut.toByteArray();
sOut.write((byte)(data.length >> 8));
sOut.write((byte)data.length);
sOut.write(data);
byte[] hData = sOut.toByteArray();
sOut.write((byte)this.getVersion());
sOut.write((byte)0xff);
sOut.write((byte)(hData.length>> 24));
sOut.write((byte)(hData.length >> 16));
sOut.write((byte)(hData.length >> 8));
sOut.write((byte)(hData.length));
}
catch (IOException e)
{
throw new RuntimeException("exception generating trailer: " + e);
}
trailer = sOut.toByteArray();
}
return trailer;
}
/**
* return the encryption algorithm tag
*/
public int getKeyAlgorithm()
{
return keyAlgorithm;
}
/**
* return the hashAlgorithm tag
*/
public int getHashAlgorithm()
{
return hashAlgorithm;
}
/**
* return the signature as a set of integers - note this is normalised to be the
* ASN.1 encoding of what appears in the signature packet.
*/
public MPInteger[] getSignature()
{
return signature;
}
/**
* Return the byte encoding of the signature section.
* @return uninterpreted signature bytes.
*/
public byte[] getSignatureBytes()
{
if (signatureEncoding == null)
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
BCPGOutputStream bcOut = new BCPGOutputStream(bOut);
for (int i = 0; i != signature.length; i++)
{
try
{
bcOut.writeObject(signature[i]);
}
catch (IOException e)
{
throw new RuntimeException("internal error: " + e);
}
}
return bOut.toByteArray();
}
else
{
return Arrays.clone(signatureEncoding);
}
}
public SignatureSubpacket[] getHashedSubPackets()
{
return hashedData;
}
public SignatureSubpacket[] getUnhashedSubPackets()
{
return unhashedData;
}
/**
* Return the creation time of the signature in milli-seconds.
*
* @return the creation time in millis
*/
public long getCreationTime()
{
return creationTime;
}
public void encode(
BCPGOutputStream out)
throws IOException
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
BCPGOutputStream pOut = new BCPGOutputStream(bOut);
pOut.write(version);
if (version == 3 || version == 2)
{
pOut.write(5); // the length of the next block
long time = creationTime / 1000;
pOut.write(signatureType);
pOut.write((byte)(time >> 24));
pOut.write((byte)(time >> 16));
pOut.write((byte)(time >> 8));
pOut.write((byte)time);
pOut.write((byte)(keyID >> 56));
pOut.write((byte)(keyID >> 48));
pOut.write((byte)(keyID >> 40));
pOut.write((byte)(keyID >> 32));
pOut.write((byte)(keyID >> 24));
pOut.write((byte)(keyID >> 16));
pOut.write((byte)(keyID >> 8));
pOut.write((byte)(keyID));
pOut.write(keyAlgorithm);
pOut.write(hashAlgorithm);
}
else if (version == 4)
{
pOut.write(signatureType);
pOut.write(keyAlgorithm);
pOut.write(hashAlgorithm);
ByteArrayOutputStream sOut = new ByteArrayOutputStream();
for (int i = 0; i != hashedData.length; i++)
{
hashedData[i].encode(sOut);
}
byte[] data = sOut.toByteArray();
pOut.write(data.length >> 8);
pOut.write(data.length);
pOut.write(data);
sOut.reset();
for (int i = 0; i != unhashedData.length; i++)
{
unhashedData[i].encode(sOut);
}
data = sOut.toByteArray();
pOut.write(data.length >> 8);
pOut.write(data.length);
pOut.write(data);
}
else
{
throw new IOException("unknown version: " + version);
}
pOut.write(fingerPrint);
if (signature != null)
{
for (int i = 0; i != signature.length; i++)
{
pOut.writeObject(signature[i]);
}
}
else
{
pOut.write(signatureEncoding);
}
out.writePacket(SIGNATURE, bOut.toByteArray(), true);
}
private void setCreationTime()
{
for (int i = 0; i != hashedData.length; i++)
{
if (hashedData[i] instanceof SignatureCreationTime)
{
creationTime = ((SignatureCreationTime)hashedData[i]).getTime().getTime();
break;
}
}
}
}
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