org.mozilla.jss.netscape.security.provider

Class SHA

java.lang.Object

java.security.MessageDigestSpi

org.mozilla.jss.netscape.security.provider.SHA

All Implemented Interfaces:

java.lang.Cloneable

public class SHA
extends java.security.MessageDigestSpi
implements java.lang.Cloneable

This class implements the Secure Hash Algorithm (SHA) developed by the National Institute of Standards and Technology along with the National Security Agency. This is the updated version of SHA fip-180 as superseded by fip-180-1.

It implement JavaSecurity MessageDigest, and can be used by in the Java Security framework, as a pluggable implementation, as a filter for the digest stream classes.

Constructor Summary

Constructors

Constructor and Description
SHA() Creates a new SHA object.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	clone()
byte[]	engineDigest() Computes the final hash and returns the final value as a byte[20] array.
int	engineDigest(byte[] hashvalue, int offset, int len) Computes the final hash and returns the final value as a byte[20] array.
protected int	engineGetDigestLength() Return the length of the digest in bytes
void	engineReset() Resets the buffers and hash value to start a new hash.
void	engineUpdate(byte b)
void	engineUpdate(byte[] b, int off, int len) Update a buffer.
void	init() Resets the buffers and hash value to start a new hash.

Methods inherited from class java.security.MessageDigestSpi

engineUpdate

Methods inherited from class java.lang.Object

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

Constructor Detail

SHA

public SHA()

Creates a new SHA object.

Method Detail

engineGetDigestLength

protected int engineGetDigestLength()

Return the length of the digest in bytes

Overrides:

engineGetDigestLength in class java.security.MessageDigestSpi

engineUpdate

public void engineUpdate(byte b)

Specified by:

engineUpdate in class java.security.MessageDigestSpi

engineUpdate

public void engineUpdate(byte[] b,
                         int off,
                         int len)

Update a buffer.

Specified by:

engineUpdate in class java.security.MessageDigestSpi

Parameters:

b - the data to be updated.

off - the start offset in the data

len - the number of bytes to be updated.

init

public void init()

Resets the buffers and hash value to start a new hash.

engineReset

public void engineReset()

Resets the buffers and hash value to start a new hash.

Specified by:

engineReset in class java.security.MessageDigestSpi

engineDigest

public byte[] engineDigest()

Computes the final hash and returns the final value as a byte[20] array. The object is reset to be ready for further use, as specified in the JavaSecurity MessageDigest specification.

Specified by:

engineDigest in class java.security.MessageDigestSpi

engineDigest

public int engineDigest(byte[] hashvalue,
                        int offset,
                        int len)
                 throws java.security.DigestException

Computes the final hash and returns the final value as a byte[20] array. The object is reset to be ready for further use, as specified in the JavaSecurity MessageDigest specification.

Overrides:

engineDigest in class java.security.MessageDigestSpi

Throws:

java.security.DigestException

clone

public java.lang.Object clone()

Overrides:

clone in class java.security.MessageDigestSpi