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package org.bouncycastle.openpgp.operator;
import java.io.OutputStream;
import org.bouncycastle.bcpg.HashAlgorithmTags;
/**
* A digest calculator, which consumes a stream of data and computes a digest value over it.
*/
public interface PGPDigestCalculator
{
/**
* Return the {@link HashAlgorithmTags algorithm number} representing the digest implemented by
* this calculator.
*
* @return the hash algorithm number
*/
int getAlgorithm();
/**
* Returns a stream that will accept data for the purpose of calculating a digest. Use
* org.bouncycastle.util.io.TeeOutputStream if you want to accumulate the data on the fly as
* well.
*
* @return an OutputStream that data to be digested can be written to.
*/
OutputStream getOutputStream();
/**
* Return the digest calculated on what has been written to the calculator's output stream.
*
* @return a digest.
*/
byte[] getDigest();
/**
* Reset the underlying digest calculator
*/
void reset();
}
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