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();}