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package org.spongycastle.openpgp.operator.jcajce;
import java.io.OutputStream;
import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.SignatureException;
import org.spongycastle.jcajce.util.DefaultJcaJceHelper;
import org.spongycastle.jcajce.util.NamedJcaJceHelper;
import org.spongycastle.jcajce.util.ProviderJcaJceHelper;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPPrivateKey;
import org.spongycastle.openpgp.operator.PGPContentSigner;
import org.spongycastle.openpgp.operator.PGPContentSignerBuilder;
import org.spongycastle.openpgp.operator.PGPDigestCalculator;
import org.spongycastle.util.io.TeeOutputStream;
public class JcaPGPContentSignerBuilder
implements PGPContentSignerBuilder
{
private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
private JcaPGPDigestCalculatorProviderBuilder digestCalculatorProviderBuilder = new JcaPGPDigestCalculatorProviderBuilder();
private JcaPGPKeyConverter keyConverter = new JcaPGPKeyConverter();
private int hashAlgorithm;
private SecureRandom random;
private int keyAlgorithm;
public JcaPGPContentSignerBuilder(int keyAlgorithm, int hashAlgorithm)
{
this.keyAlgorithm = keyAlgorithm;
this.hashAlgorithm = hashAlgorithm;
}
public JcaPGPContentSignerBuilder setSecureRandom(SecureRandom random)
{
this.random = random;
return this;
}
public JcaPGPContentSignerBuilder setProvider(Provider provider)
{
this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
keyConverter.setProvider(provider);
digestCalculatorProviderBuilder.setProvider(provider);
return this;
}
public JcaPGPContentSignerBuilder setProvider(String providerName)
{
this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
keyConverter.setProvider(providerName);
digestCalculatorProviderBuilder.setProvider(providerName);
return this;
}
public JcaPGPContentSignerBuilder setDigestProvider(Provider provider)
{
digestCalculatorProviderBuilder.setProvider(provider);
return this;
}
public JcaPGPContentSignerBuilder setDigestProvider(String providerName)
{
digestCalculatorProviderBuilder.setProvider(providerName);
return this;
}
public PGPContentSigner build(final int signatureType, PGPPrivateKey privateKey)
throws PGPException
{
if (privateKey instanceof JcaPGPPrivateKey)
{
return build(signatureType, privateKey.getKeyID(), ((JcaPGPPrivateKey)privateKey).getPrivateKey());
}
else
{
return build(signatureType, privateKey.getKeyID(), keyConverter.getPrivateKey(privateKey));
}
}
public PGPContentSigner build(final int signatureType, final long keyID, final PrivateKey privateKey)
throws PGPException
{
final PGPDigestCalculator digestCalculator = digestCalculatorProviderBuilder.build().get(hashAlgorithm);
final Signature signature = helper.createSignature(keyAlgorithm, hashAlgorithm);
try
{
if (random != null)
{
signature.initSign(privateKey, random);
}
else
{
signature.initSign(privateKey);
}
}
catch (InvalidKeyException e)
{
throw new PGPException("invalid key.", e);
}
return new PGPContentSigner()
{
public int getType()
{
return signatureType;
}
public int getHashAlgorithm()
{
return hashAlgorithm;
}
public int getKeyAlgorithm()
{
return keyAlgorithm;
}
public long getKeyID()
{
return keyID;
}
public OutputStream getOutputStream()
{
return new TeeOutputStream(new SignatureOutputStream(signature), digestCalculator.getOutputStream());
}
public byte[] getSignature()
{
try
{
return signature.sign();
}
catch (SignatureException e)
{ // TODO: need a specific runtime exception for PGP operators.
throw new IllegalStateException("unable to create signature");
}
}
public byte[] getDigest()
{
return digestCalculator.getDigest();
}
};
}
}
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