org.bouncycastle.operator.DigestCalculator Maven / Gradle / Ivy
package org.bouncycastle.operator;
import java.io.OutputStream;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
/**
* General interface for an operator that is able to calculate a digest from
* a stream of output.
*/
public interface DigestCalculator
{
/**
* Return the algorithm identifier representing the digest implemented by
* this calculator.
*
* @return algorithm id and parameters.
*/
AlgorithmIdentifier getAlgorithmIdentifier();
/**
* 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
*/
OutputStream getOutputStream();
/**
* Return the digest calculated on what has been written to the calculator's output stream.
*
* @return a digest.
*/
byte[] getDigest();
}