Class Shacal2Engine

  • All Implemented Interfaces:
    BlockCipher

    public class Shacal2Engine
    extends Object
    implements BlockCipher
    Block cipher Shacal2, designed by Helena Handschuh and David Naccache, based on hash function SHA-256, using SHA-256-Initialization-Values as data and SHA-256-Data as key.

    A description of Shacal can be found at: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.3.4066 Best known cryptanalytic (Wikipedia 11.2013): Related-key rectangle attack on 44-rounds (Jiqiang Lu, Jongsung Kim). Comments are related to SHA-256-Naming as described in FIPS PUB 180-2

    • Constructor Detail

      • Shacal2Engine

        public Shacal2Engine()
    • Method Detail

      • reset

        public void reset()
        Description copied from interface: BlockCipher
        Reset the cipher. After resetting the cipher is in the same state as it was after the last init (if there was one).
        Specified by:
        reset in interface BlockCipher
      • getAlgorithmName

        public String getAlgorithmName()
        Description copied from interface: BlockCipher
        Return the name of the algorithm the cipher implements.
        Specified by:
        getAlgorithmName in interface BlockCipher
        Returns:
        the name of the algorithm the cipher implements.
      • getBlockSize

        public int getBlockSize()
        Description copied from interface: BlockCipher
        Return the block size for this cipher (in bytes).
        Specified by:
        getBlockSize in interface BlockCipher
        Returns:
        the block size for this cipher in bytes.
      • init

        public void init​(boolean _forEncryption,
                         CipherParameters params)
                  throws IllegalArgumentException
        Description copied from interface: BlockCipher
        Initialise the cipher.
        Specified by:
        init in interface BlockCipher
        Parameters:
        _forEncryption - if true the cipher is initialised for encryption, if false for decryption.
        params - the key and other data required by the cipher.
        Throws:
        IllegalArgumentException - if the params argument is inappropriate.
      • setKey

        public void setKey​(byte[] kb)
      • processBlock

        public int processBlock​(byte[] in,
                                int inOffset,
                                byte[] out,
                                int outOffset)
                         throws DataLengthException,
                                IllegalStateException
        Description copied from interface: BlockCipher
        Process one block of input from the array in and write it to the out array.
        Specified by:
        processBlock in interface BlockCipher
        Parameters:
        in - the array containing the input data.
        inOffset - offset into the in array the data starts at.
        out - the array the output data will be copied into.
        outOffset - the offset into the out array the output will start at.
        Returns:
        the number of bytes processed and produced.
        Throws:
        DataLengthException - if there isn't enough data in in, or space in out.
        IllegalStateException - if the cipher isn't initialised.