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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/security/hash/IMessageDigest.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/security/hash/IMessageDigest.java')
-rw-r--r-- | libjava/classpath/gnu/java/security/hash/IMessageDigest.java | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/security/hash/IMessageDigest.java b/libjava/classpath/gnu/java/security/hash/IMessageDigest.java new file mode 100644 index 000000000..9b716e596 --- /dev/null +++ b/libjava/classpath/gnu/java/security/hash/IMessageDigest.java @@ -0,0 +1,127 @@ +/* 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(); +} |