Package fr.cryptohash

Class Keccak256

java.lang.Object
fr.cryptohash.DigestEngine
fr.cryptohash.Keccak256
All Implemented Interfaces:
Digest
public class Keccak256
extends DigestEngine

This class implements the Keccak-256 digest algorithm under the Digest API.

 ==========================(LICENSE BEGIN)============================

 Copyright (c) 2007-2010  Projet RNRT SAPHIR
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
 "Software"), to deal in the Software without restriction, including
 without limitation the rights to use, copy, modify, merge, publish,
 distribute, sublicense, and/or sell copies of the Software, and to
 permit persons to whom the Software is furnished to do so, subject to
 the following conditions:
 
 The above copyright notice and this permission notice shall be
 included in all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 ===========================(LICENSE END)=============================
Version:
$Revision: 189 $
Author:
Thomas Pornin <thomas.pornin@cryptolog.com>

  • Constructor Details

    • Keccak256

      public Keccak256()
      Create the engine.

  • Method Details

    • copy

      public Digest copy()
      Description copied from interface: Digest
      Clone the current state. The returned object evolves independantly of this object.
      Returns:
      the clone
      See Also:
      Digest

    • getDigestLength

      public int getDigestLength()
      Description copied from interface: Digest
      Get the natural hash function output length (in bytes).
      Returns:
      the digest output length (in bytes)
      See Also:
      Digest

    • engineReset

      protected void engineReset()
      Description copied from class: DigestEngine
      Reset the hash algorithm state.
      Specified by:
      engineReset in class DigestEngine
      See Also:
      DigestEngine

    • processBlock

      protected void processBlock​(byte[] data)
      Description copied from class: DigestEngine
      Process one block of data.
      Specified by:
      processBlock in class DigestEngine
      Parameters:
      data - the data block
      See Also:
      DigestEngine

    • doPadding

      protected void doPadding​(byte[] out, int off)
      Description copied from class: DigestEngine
      Perform the final padding and store the result in the provided buffer. This method shall call DigestEngine.flush() and then DigestEngine.update(byte) with the appropriate padding data in order to get the full input data.
      Specified by:
      doPadding in class DigestEngine
      Parameters:
      out - the output buffer
      off - the output offset
      See Also:
      DigestEngine

    • doInit

      protected void doInit()
      Description copied from class: DigestEngine
      This function is called at object creation time; the implementation should use it to perform initialization tasks. After this method is called, the implementation should be ready to process data or meaningfully honour calls such as Digest.getDigestLength().
      Specified by:
      doInit in class DigestEngine
      See Also:
      DigestEngine

    • getBlockLength

      public int getBlockLength()
      Description copied from interface: Digest

      Return the "block length" for the hash function. This value is naturally defined for iterated hash functions (Merkle-Damgard). It is used in HMAC (that's what the HMAC specification names the "B" parameter).

      If the function is "block-less" then this function may return -n where n is an integer such that the block length for HMAC ("B") will be inferred from the key length, by selecting the smallest multiple of n which is no smaller than the key length. For instance, for the Fugue-xxx hash functions, this function returns -4: the virtual block length B is the HMAC key length, rounded up to the next multiple of 4.

      Returns:
      the internal block length (in bytes), or -n
      See Also:
      Digest

    • copyState

      protected Digest copyState​(fr.cryptohash.KeccakCore dst)
      See Also:
      DigestEngine

    • toString

      public String toString()
      Description copied from interface: Digest

      Get the display name for this function (e.g. "SHA-1" for SHA-1).

      Specified by:
      toString in interface Digest
      Overrides:
      toString in class Object
      See Also:
      Digest