GCFBBlockCipher (Bouncy Castle Library 1.52 API Specification)

org.bouncycastle.crypto.modes

## Class GCFBBlockCipher

- java.lang.Object
- - org.bouncycastle.crypto.StreamBlockCipher
  - - org.bouncycastle.crypto.modes.GCFBBlockCipher

- All Implemented Interfaces:
    BlockCipher, StreamCipher

      public class GCFBBlockCipher
      extends StreamBlockCipher

  An implementation of the GOST CFB mode with CryptoPro key meshing as described in RFC 4357.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `GCFBBlockCipher(BlockCipher engine)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected byte` | `calculateByte(byte b)`
    `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 inOff, byte[] out, int outOff)` Process one block of input from the array in and write it to the out array.
    `void` | `reset()` Reset the cipher.

    - ### Methods inherited from class org.bouncycastle.crypto.StreamBlockCipher

      `getUnderlyingCipher, processBytes, returnByte`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### GCFBBlockCipher

          public GCFBBlockCipher(BlockCipher engine)

  - ### Method Detail

    - #### init

          public void init(boolean forEncryption,
                  CipherParameters params)
                    throws java.lang.IllegalArgumentException

      Description copied from interface: `BlockCipher`
      Initialise the cipher.
      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.

    - #### getAlgorithmName

          public java.lang.String getAlgorithmName()

      Description copied from interface: `BlockCipher`
      Return the name of the algorithm the cipher implements.
      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).
      Returns:
        the block size for this cipher in bytes.

    - #### processBlock

          public int processBlock(byte[] in,
                         int inOff,
                         byte[] out,
                         int outOff)
                           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.
      Parameters:
        `in` - the array containing the input data.
        `inOff` - offset into the in array the data starts at.
        `out` - the array the output data will be copied into.
        `outOff` - 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.
        `java.lang.IllegalStateException` - if the cipher isn't initialised.

    - #### calculateByte

          protected byte calculateByte(byte b)

      Specified by:
        `calculateByte` in class `StreamBlockCipher`

    - #### 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).