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package org.spongycastle.operator.bc;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.crypto.Digest;
import org.spongycastle.crypto.ExtendedDigest;
import org.spongycastle.operator.DigestCalculator;
import org.spongycastle.operator.DigestCalculatorProvider;
import org.spongycastle.operator.OperatorCreationException;
public class BcDigestCalculatorProvider
implements DigestCalculatorProvider
{
private BcDigestProvider digestProvider = BcDefaultDigestProvider.INSTANCE;
public DigestCalculator get(final AlgorithmIdentifier algorithm)
throws OperatorCreationException
{
Digest dig = digestProvider.get(algorithm);
final DigestOutputStream stream = new DigestOutputStream(dig);
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 Digest dig;
DigestOutputStream(Digest 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, 0, bytes.length);
}
public void write(int b)
throws IOException
{
dig.update((byte)b);
}
byte[] getDigest()
{
byte[] d = new byte[dig.getDigestSize()];
dig.doFinal(d, 0);
return d;
}
}
}
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