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package org.bouncycastle.operator.jcajce;
import java.io.IOException;
import java.io.OutputStream;
import java.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.SignatureException;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.DefaultSignatureAlgorithmIdentifierFinder;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.OperatorStreamException;
import org.bouncycastle.operator.RuntimeOperatorException;
public class JcaContentSignerBuilder
{
private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
private SecureRandom random;
private String signatureAlgorithm;
private AlgorithmIdentifier sigAlgId;
public JcaContentSignerBuilder(String signatureAlgorithm)
{
this.signatureAlgorithm = signatureAlgorithm;
this.sigAlgId = new DefaultSignatureAlgorithmIdentifierFinder().find(signatureAlgorithm);
}
public JcaContentSignerBuilder setProvider(Provider provider)
{
this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
return this;
}
public JcaContentSignerBuilder setProvider(String providerName)
{
this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
return this;
}
public JcaContentSignerBuilder setSecureRandom(SecureRandom random)
{
this.random = random;
return this;
}
public ContentSigner build(PrivateKey privateKey)
throws OperatorCreationException
{
try
{
final Signature sig = helper.createSignature(sigAlgId);
if (random != null)
{
sig.initSign(privateKey, random);
}
else
{
sig.initSign(privateKey);
}
return new ContentSigner()
{
private SignatureOutputStream stream = new SignatureOutputStream(sig);
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return sigAlgId;
}
public OutputStream getOutputStream()
{
return stream;
}
public byte[] getSignature()
{
try
{
return stream.getSignature();
}
catch (SignatureException e)
{
throw new RuntimeOperatorException("exception obtaining signature: " + e.getMessage(), e);
}
}
};
}
catch (GeneralSecurityException e)
{
throw new OperatorCreationException("cannot create signer: " + e.getMessage(), e);
}
}
private class SignatureOutputStream
extends OutputStream
{
private Signature sig;
SignatureOutputStream(Signature sig)
{
this.sig = sig;
}
public void write(byte[] bytes, int off, int len)
throws IOException
{
try
{
sig.update(bytes, off, len);
}
catch (SignatureException e)
{
throw new OperatorStreamException("exception in content signer: " + e.getMessage(), e);
}
}
public void write(byte[] bytes)
throws IOException
{
try
{
sig.update(bytes);
}
catch (SignatureException e)
{
throw new OperatorStreamException("exception in content signer: " + e.getMessage(), e);
}
}
public void write(int b)
throws IOException
{
try
{
sig.update((byte)b);
}
catch (SignatureException e)
{
throw new OperatorStreamException("exception in content signer: " + e.getMessage(), e);
}
}
byte[] getSignature()
throws SignatureException
{
return sig.sign();
}
}
}
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