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## org.bouncycastle.crypto.engines
Class Shacal2Engine

    java.lang.Object
      org.bouncycastle.crypto.engines.Shacal2Engine

All Implemented Interfaces:
  BlockCipher

public class Shacal2Engine
extends java.lang.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: https://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 Summary
`Shacal2Engine()`

Method Summary
`java.lang.String` | `getAlgorithmName()` Return the name of the algorithm the cipher implements.
`int` | `getBlockSize()` Return the block size for this cipher (in bytes).
`void` | `init(boolean _forEncryption, CipherParameters params)` Initialise the cipher.
`int` | `processBlock(byte[] in, int inOffset, byte[] out, int outOffset)` Process one block of input from the array in and write it to the out array.
`void` | `reset()` Reset the cipher.
`void` | `setKey(byte[] kb)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

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 java.lang.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 java.lang.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:
    `java.lang.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,
                            java.lang.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:
    `java.lang.IllegalStateException` - if the cipher isn't initialised.
    `DataLengthException` - if there isn't enough data in input , or space in out.

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