gnu.crypto.hash (GNU cryptographic primitives and tools)
Keywords: gnu.crypto.hash package

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## Package gnu.crypto.hash

Provides a basic API for using message digest algorithms.

See:
Description

Interface Summary
IMessageDigest | The basic visible methods of any hash algorithm.

Class Summary
BaseHash | A base abstract class to facilitate hash implementations.
HashFactory | A Factory to instantiate message digest algorithm instances.
Haval | The HAVAL message-digest algorithm is a variable output length, with variable number of rounds.
MD2 | An implementation of the MD2 message digest algorithm.
MD4 | An implementation of Ron Rivest's MD4 message digest algorithm.
MD5 | The MD5 message-digest algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input.
RipeMD128 | RIPEMD-128 is a 128-bit message digest.
RipeMD160 | RIPEMD-160 is a 160-bit message digest.
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.
Sha256 | Implementation of SHA2-1 [SHA-256] per the IETF Draft Specification.
Sha384 | Implementation of SHA2-2 [SHA-384] per the IETF Draft Specification.
Sha512 | Implementation of SHA2-3 [SHA-512] per the IETF Draft Specification.
Tiger | The Tiger message digest.
Whirlpool | Whirlpool, a new 512-bit hashing function operating on messages less than 2 ** 256 bits in length.

## Package gnu.crypto.hash Description

Provides a basic API for using message digest algorithms.

## Package overview

Message digests, or one-way hash functions, generate fixed-sized signatures from variable-sized texts, in such a way that it is computationally infeasible to determine the source text from the signature or to find a different text that hashes to the same signature.

The following diagram shows the important classes participating in this package:

Here is a simple example of how to use the SHA-1 hash.

    IMessageDigest md = HashFactory.getInstance("SHA-1");
    md.update(input, 0, input.length);
    byte[] digest = md.digest();

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