com.motorola.iden.provider
Class SHA

java.lang.Object
  |
  +--com.motorola.iden.security.MessageDigestSpi
        |
        +--com.motorola.iden.security.MessageDigest
              |
              +--com.motorola.iden.provider.SHA

public final class SHA

extends MessageDigest

The SHA class is used to compute an SHA-1 message digest over arbitraty-sized data.

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© Copyright 2002 - 2004 Motorola, Inc. All Rights Reserved.

See Also:

[CipherSpi]

Constructor Summary

SHA()
Standard constructor, creates and initializes a new SHA instance.

Method Summary

protected byte[]	engineDigest() Completes the hash computation by performing final operations such as padding.
protected int	engineGetDigestLength() Return the digest length in bytes
protected void	engineReset() Initializes (resets) the message digest.
protected void	engineUpdate(byte b) Updates the digest using the specified byte.
protected void	engineUpdate(byte[] input, int offset, int len) Updates the digest using the specified array of bytes, starting at the specified offset.
protected void	finalize()

Methods inherited from class com.motorola.iden.security.MessageDigest

digest, getAlgorithm, getDigestLength, getInstance, getInstance, reset, update, update

Methods inherited from class java.lang.Object

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

Constructor Detail

SHA

public SHA()

Standard constructor, creates and initializes a new SHA instance.

Method Detail

engineReset

protected void engineReset()

Initializes (resets) the message digest.

Overrides:

engineReset in class MessageDigestSpi

engineGetDigestLength

protected int engineGetDigestLength()

Return the digest length in bytes

Overrides:

engineGetDigestLength in class MessageDigestSpi

Returns:

SHA digest length in bytes.

engineUpdate

protected void engineUpdate(byte b)

Updates the digest using the specified byte.

Overrides:

engineUpdate in class MessageDigestSpi

Parameters:

b - the byte with which to update the digest.

engineUpdate

protected void engineUpdate(byte[] input,
                            int offset,
                            int len)

Updates the digest using the specified array of bytes, starting at the specified offset.

Overrides:

engineUpdate in class MessageDigestSpi

Parameters:

input - the array of bytes.

offset - the offset to start from in the array of bytes.

len - the number of bytes to be used, starting at offset.

engineDigest

protected byte[] engineDigest()

Completes the hash computation by performing final operations such as padding. Once engineDigest has been called, the engine should be reset. Resetting is the responsibility of the engine implementor.

Overrides:

engineDigest in class MessageDigestSpi

Returns:

the array of bytes for the resulting hash value.

finalize

protected void finalize()

Overrides:

finalize in class java.lang.Object