Package gnu.crypto.hash
Provides a basic API for using message digest algorithms.
IMessageDigest | The basic visible methods of any hash algorithm.
A hash (or message digest) algorithm produces its output by iterating a
basic compression function on blocks of data.
|
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.
MD2 is not widely used. |
MD4 | An implementation of Ron Rivest's MD4 message digest algorithm.
MD4 was the precursor to the stronger MD5
algorithm, and while not considered cryptograpically secure itself, MD4 is
in use in various applications. |
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.
References:
-
RIPEMD160: A Strengthened Version of RIPEMD.
Hans Dobbertin, Antoon Bosselaers and Bart Preneel.
|
RipeMD160 | RIPEMD-160 is a 160-bit message digest.
References:
-
RIPEMD160: A Strengthened Version of RIPEMD.
Hans Dobbertin, Antoon Bosselaers and Bart Preneel.
|
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.
References:
-
Descriptions of SHA-256, SHA-384, and SHA-512,
- http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf
|
Sha384 | Implementation of SHA2-2 [SHA-384] per the IETF Draft Specification.
References:
-
Descriptions of SHA-256, SHA-384, and SHA-512,
- http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf
|
Sha512 | Implementation of SHA2-3 [SHA-512] per the IETF Draft Specification.
References:
-
Descriptions of SHA-256, SHA-384, and SHA-512,
- http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf
|
Tiger | The Tiger message digest. |
Whirlpool | Whirlpool, a new 512-bit hashing function operating on messages less than
2 ** 256 bits in length. |
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:
![]()
../../../../diagrams/hash_class_diag.png"
width=362 height=271 border=0>
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();
<!-- $Revision: 1.4 $ -->
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