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-/* IMessageDigest.java --
- Copyright (C) 2001, 2002, 2006 Free Software Foundation, Inc.
-
-This file is a part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or (at
-your option) any later version.
-
-GNU Classpath is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; if not, write to the Free Software
-Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
-USA
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package gnu.java.security.hash;
-
-/**
- * The basic visible methods of any hash algorithm.
- * <p>
- * A hash (or message digest) algorithm produces its output by iterating a basic
- * compression function on blocks of data.
- */
-public interface IMessageDigest
- extends Cloneable
-{
- /**
- * Returns the canonical name of this algorithm.
- *
- * @return the canonical name of this instance.
- */
- String name();
-
- /**
- * Returns the output length in bytes of this message digest algorithm.
- *
- * @return the output length in bytes of this message digest algorithm.
- */
- int hashSize();
-
- /**
- * Returns the algorithm's (inner) block size in bytes.
- *
- * @return the algorithm's inner block size in bytes.
- */
- int blockSize();
-
- /**
- * Continues a message digest operation using the input byte.
- *
- * @param b the input byte to digest.
- */
- void update(byte b);
-
- /**
- * Continues a message digest operation, by filling the buffer, processing
- * data in the algorithm's HASH_SIZE-bit block(s), updating the context and
- * count, and buffering the remaining bytes in buffer for the next operation.
- *
- * @param in the input block.
- */
- void update(byte[] in);
-
- /**
- * Continues a message digest operation, by filling the buffer, processing
- * data in the algorithm's HASH_SIZE-bit block(s), updating the context and
- * count, and buffering the remaining bytes in buffer for the next operation.
- *
- * @param in the input block.
- * @param offset start of meaningful bytes in input block.
- * @param length number of bytes, in input block, to consider.
- */
- void update(byte[] in, int offset, int length);
-
- /**
- * Completes the message digest by performing final operations such as padding
- * and resetting the instance.
- *
- * @return the array of bytes representing the hash value.
- */
- byte[] digest();
-
- /**
- * Resets the current context of this instance clearing any eventually cached
- * intermediary values.
- */
- void reset();
-
- /**
- * A basic test. Ensures that the digest of a pre-determined message is equal
- * to a known pre-computed value.
- *
- * @return <code>true</code> if the implementation passes a basic self-test.
- * Returns <code>false</code> otherwise.
- */
- boolean selfTest();
-
- /**
- * Returns a clone copy of this instance.
- *
- * @return a clone copy of this instance.
- */
- Object clone();
-}