org.bouncycastle.openpgp.operator.PGPDigestCalculator Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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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();
}