Package org.bouncycastle.crypto

Interface BlockCipher

All Known Implementing Classes:
AESEngine, DESEngine
public interface BlockCipher
Block cipher engines are expected to conform to this interface.

  • Method Summary

    Modifier and Type
    Method
    Description
    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.

  • Method Details

    • init

      void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException
      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:
      IllegalArgumentException - if the params argument is inappropriate.

    • getAlgorithmName

      String getAlgorithmName()
      Return the name of the algorithm the cipher implements.
      Returns:
      the name of the algorithm the cipher implements.

    • getBlockSize

      int getBlockSize()
      Return the block size for this cipher (in bytes).
      Returns:
      the block size for this cipher in bytes.

    • processBlock

      int processBlock(byte[] in, int inOff, byte[] out, int outOff) throws DataLengthException, IllegalStateException
      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.
      IllegalStateException - if the cipher isn't initialised.

    • reset

      void reset()
      Reset the cipher. After resetting the cipher is in the same state as it was after the last init (if there was one).