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package org.bouncycastle.operator.jcajce;
import java.io.IOException;
import java.io.OutputStream;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.Provider;
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.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;
public class JcaDigestCalculatorProviderBuilder
{
private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
public JcaDigestCalculatorProviderBuilder()
{
}
public JcaDigestCalculatorProviderBuilder setProvider(Provider provider)
{
this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
return this;
}
public JcaDigestCalculatorProviderBuilder setProvider(String providerName)
{
this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
return this;
}
public DigestCalculatorProvider build()
throws OperatorCreationException
{
return new DigestCalculatorProvider()
{
public DigestCalculator get(final AlgorithmIdentifier algorithm)
throws OperatorCreationException
{
final DigestOutputStream stream;
try
{
MessageDigest dig = helper.createDigest(algorithm);
stream = new DigestOutputStream(dig);
}
catch (GeneralSecurityException e)
{
throw new OperatorCreationException("exception on setup: " + e, e);
}
return new DigestCalculator()
{
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return algorithm;
}
public OutputStream getOutputStream()
{
return stream;
}
public byte[] getDigest()
{
return stream.getDigest();
}
};
}
};
}
private class DigestOutputStream
extends OutputStream
{
private MessageDigest dig;
DigestOutputStream(MessageDigest dig)
{
this.dig = dig;
}
public void write(byte[] bytes, int off, int len)
throws IOException
{
dig.update(bytes, off, len);
}
public void write(byte[] bytes)
throws IOException
{
dig.update(bytes);
}
public void write(int b)
throws IOException
{
dig.update((byte)b);
}
byte[] getDigest()
{
return dig.digest();
}
}
}
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