Class Sha160

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.

public Sha160()

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

public Object clone()

protected byte[] getResult()

protected byte[] padBuffer()

protected void resetContext()

public boolean selfTest()

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