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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.

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package org.bouncycastle.crypto;

/**
 * interface that a message digest conforms to.
 */
public interface Digest
{
    /**
     * return the algorithm name
     *
     * @return the algorithm name
     */
    public String getAlgorithmName();

    /**
     * return the size, in bytes, of the digest produced by this message digest.
     *
     * @return the size, in bytes, of the digest produced by this message digest.
     */
    public int getDigestSize();

    /**
     * update the message digest with a single byte.
     *
     * @param in the input byte to be entered.
     */
    public void update(byte in);

    /**
     * update the message digest with a block of bytes.
     *
     * @param in the byte array containing the data.
     * @param inOff the offset into the byte array where the data starts.
     * @param len the length of the data.
     */
    public void update(byte[] in, int inOff, int len);

    /**
     * close the digest, producing the final digest value. The doFinal
     * call leaves the digest reset.
     *
     * @param out the array the digest is to be copied into.
     * @param outOff the offset into the out array the digest is to start at.
     */
    public int doFinal(byte[] out, int outOff);

    /**
     * reset the digest back to it's initial state.
     */
    public void reset();
}