gnu.crypto.hash

Class Sha160

public class Sha160 extends BaseHash

The Secure Hash Algorithm (SHA-1) is required for use with the Digital Signature Algorithm (DSA) as specified in the Digital Signature Standard (DSS) and whenever a secure hash algorithm is required for federal applications. For a message of length less than 2^64 bits, the SHA-1 produces a 160-bit condensed representation of the message called a message digest. The message digest is used during generation of a signature for the message. The SHA-1 is also used to compute a message digest for the received version of the message during the process of verifying the signature. Any change to the message in transit will, with very high probability, result in a different message digest, and the signature will fail to verify.

The SHA-1 is designed to have the following properties: it is computationally infeasible to find a message which corresponds to a given message digest, or to find two different messages which produce the same message digest.

References:

  1. SECURE HASH STANDARD
    Federal Information, Processing Standards Publication 180-1, 1995 April 17.

Version: $Revision: 1.10 $

Constructor Summary
Sha160()
Trivial 0-arguments constructor.
Method Summary
Objectclone()
protected byte[]getResult()
static int[]G(int hh0, int hh1, int hh2, int hh3, int hh4, byte[] in, int offset)
protected byte[]padBuffer()
protected voidresetContext()
booleanselfTest()
protected voidtransform(byte[] in, int offset)

Constructor Detail

Sha160

public Sha160()
Trivial 0-arguments constructor.

Method Detail

clone

public Object clone()

getResult

protected byte[] getResult()

G

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

padBuffer

protected byte[] padBuffer()

resetContext

protected void resetContext()

selfTest

public boolean selfTest()

transform

protected void transform(byte[] in, int offset)
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