Class Sha256

Implemented Interfaces:
Cloneable, IMessageDigest

public class Sha256
extends BaseHash

Implementation of SHA2-1 [SHA-256] per the IETF Draft Specification.


  1. Descriptions of SHA-256, SHA-384, and SHA-512,

Field Summary

Fields inherited from class

blockSize, buffer, count, hashSize, name

Constructor Summary

Trivial 0-arguments constructor.

Method Summary

static int[]
G(int hh0, int hh1, int hh2, int hh3, int hh4, int hh5, int hh6, int hh7, byte[] in, int offset)
Returns a clone copy of this instance.
protected byte[]
protected byte[]
protected void
A basic test.
protected void
transform(byte[] in, int offset)

Methods inherited from class

blockSize, clone, digest, getResult, hashSize, name, padBuffer, reset, resetContext, selfTest, transform, update, update, update

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details


public Sha256()
Trivial 0-arguments constructor.

Method Details


public static final int[] G(int hh0,
                            int hh1,
                            int hh2,
                            int hh3,
                            int hh4,
                            int hh5,
                            int hh6,
                            int hh7,
                            byte[] in,
                            int offset)


public Object clone()
Returns a clone copy of this instance.
Specified by:
clone in interface IMessageDigest
clone in interface BaseHash
a clone copy of this instance.


protected byte[] getResult()
getResult in interface BaseHash


protected byte[] padBuffer()
padBuffer in interface BaseHash


protected void resetContext()
resetContext in interface BaseHash


public boolean selfTest()
A basic test. Ensures that the digest of a pre-determined message is equal to a known pre-computed value.
Specified by:
selfTest in interface IMessageDigest
selfTest in interface BaseHash
true if the implementation passes a basic self-test. Returns false otherwise.


protected void transform(byte[] in,
                         int offset)
transform in interface BaseHash -- Copyright (C) 2003, 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.