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