gnu.java.security.provider

Class SHA

Implemented Interfaces:
Cloneable

public class SHA
extends MessageDigest
implements Cloneable

This class implements the SHA-1 algorithm as described in [1]. [1] Federal Information Processing Standards Publication 180-1. Specifications for the Secure Hash Standard. April 17, 1995.
See Also:
MessageDigest

Constructor Summary

SHA()
Default constructor of the MessageDigestSpi class

Method Summary

Object
clone()
Returns a clone if the implementation is cloneable.
byte[]
engineDigest()
Computes the final digest of the stored bytes and returns them.
int
engineGetDigestLength()
Returns the length of the digest.
void
engineReset()
Resets the digest engine.
void
engineUpdate(byte b)
Updates the digest with the specified byte.
void
engineUpdate(bytes[] , int off, int len)

Methods inherited from class java.security.MessageDigest

clone, digest, digest, digest, getAlgorithm, getDigestLength, getInstance, getInstance, getInstance, getProvider, isEqual, reset, toString, update, update, update

Methods inherited from class java.security.MessageDigestSpi

clone, engineDigest, engineDigest, engineGetDigestLength, engineReset, engineUpdate, engineUpdate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SHA

public SHA()
Default constructor of the MessageDigestSpi class

Method Details

clone

public Object clone()
Returns a clone if the implementation is cloneable.
Overrides:
clone in interface MessageDigest
Returns:
a clone if the implementation is cloneable.

engineDigest

public byte[] engineDigest()
Computes the final digest of the stored bytes and returns them. It performs any necessary padding. The message digest should reset sensitive data after performing the digest.
Overrides:
engineDigest in interface MessageDigestSpi
Returns:
An array of bytes containing the digest

engineGetDigestLength

public int engineGetDigestLength()
Returns the length of the digest. It may be overridden by the provider to return the length of the digest. Default is to return 0. It is concrete for backwards compatibility with JDK1.1 message digest classes.
Overrides:
engineGetDigestLength in interface MessageDigestSpi
Returns:
Length of Digest in Bytes
Since:
1.2

engineReset

public void engineReset()
Resets the digest engine. Reinitializes internal variables and clears sensitive data.
Overrides:
engineReset in interface MessageDigestSpi

engineUpdate

public void engineUpdate(byte b)
Updates the digest with the specified byte.
Overrides:
engineUpdate in interface MessageDigestSpi
Parameters:

engineUpdate

public void engineUpdate(bytes[] ,
                         int off,
                         int len)

SHA.java -- Class implementing the SHA-1 algorithm as specified in [1]. Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc. This file is 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, 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; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, 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.