public PGPContentSigner build(final int signatureType, final PGPPrivateKey privateKey)
throws PGPException
{
final PGPDigestCalculator digestCalculator = digestCalculatorProvider.get(hashAlgorithm);
final Signer signer = BcImplProvider.createSigner(keyAlgorithm, hashAlgorithm);
if (random != null)
{
signer.init(true, new ParametersWithRandom(keyConverter.getPrivateKey(privateKey), random));
}
else
{
signer.init(true, keyConverter.getPrivateKey(privateKey));
}
return new PGPContentSigner()
{
public int getType()
{
return signatureType;
}
public int getHashAlgorithm()
{
return hashAlgorithm;
}
public int getKeyAlgorithm()
{
return keyAlgorithm;
}
public long getKeyID()
{
return privateKey.getKeyID();
}
public OutputStream getOutputStream()
{
return new TeeOutputStream(new SignerOutputStream(signer), digestCalculator.getOutputStream());
}
public byte[] getSignature()
{
try
{
return signer.generateSignature();
}
catch (CryptoException e)
{ // TODO: need a specific runtime exception for PGP operators.
throw new IllegalStateException("unable to create signature");
}