Package org.bouncycastle.crypto.engines

Class CAST5Engine

java.lang.Object
org.bouncycastle.crypto.engines.CAST5Engine
All Implemented Interfaces:
BlockCipher
Direct Known Subclasses:
CAST6Engine
public class CAST5Engine extends Object implements BlockCipher
A class that provides CAST key encryption operations, such as encoding data and generating keys. All the algorithms herein are from the Internet RFC's RFC2144 - CAST5 (64bit block, 40-128bit key) RFC2612 - CAST6 (128bit block, 128-256bit key) and implement a simplified cryptography interface.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected int[]
    _Km
     
    protected int[]
    _Kr
     
    protected static final int
    BLOCK_SIZE
     
    protected static final int
    MAX_ROUNDS
     
    protected static final int
    RED_ROUNDS
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    CAST5Engine()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    protected final void
    Bits32ToBytes(int in, byte[] b, int offset)
     
    protected final void
    Bits32ToInts(int in, int[] b, int offset)
     
    protected final int
    BytesTo32bits(byte[] b, int i)
     
    protected final void
    CAST_Decipher(int L16, int R16, int[] result)
     
    protected final void
    CAST_Encipher(int L0, int R0, int[] result)
    Does the 16 rounds to encrypt the block.
    protected int
    decryptBlock(byte[] src, int srcIndex, byte[] dst, int dstIndex)
    Decrypt the given input starting at the given offset and place the result in the provided buffer starting at the given offset.
    protected int
    encryptBlock(byte[] src, int srcIndex, byte[] dst, int dstIndex)
    Encrypt the given input starting at the given offset and place the result in the provided buffer starting at the given offset.
    protected final int
    F1(int D, int Kmi, int Kri)
    The first of the three processing functions for the encryption and decryption.
    protected final int
    F2(int D, int Kmi, int Kri)
    The second of the three processing functions for the encryption and decryption.
    protected final int
    F3(int D, int Kmi, int Kri)
    The third of the three processing functions for the encryption and decryption.
    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 encrypting, CipherParameters params)
    initialise a CAST cipher.
    protected final int
    IntsTo32bits(int[] b, int i)
     
    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.
    protected void
    setKey(byte[] key)
     

    Methods inherited from class java.lang.Object

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

  • Field Details

  • Constructor Details

    • CAST5Engine

      public CAST5Engine()

  • Method Details

    • init

      public void init(boolean encrypting, CipherParameters params)
      initialise a CAST cipher.
      Specified by:
      init in interface BlockCipher
      Parameters:
      encrypting - whether or not we are for encryption.
      params - the parameters required to set up the cipher.
      Throws:
      IllegalArgumentException - if the params argument is inappropriate.

    • 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.

    • processBlock

      public int processBlock(byte[] in, int inOff, byte[] out, int outOff)
      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.
      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.

    • 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

    • 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.

    • setKey

      protected void setKey(byte[] key)

    • encryptBlock

      protected int encryptBlock(byte[] src, int srcIndex, byte[] dst, int dstIndex)
      Encrypt the given input starting at the given offset and place the result in the provided buffer starting at the given offset.
      Parameters:
      src - The plaintext buffer
      srcIndex - An offset into src
      dst - The ciphertext buffer
      dstIndex - An offset into dst

    • decryptBlock

      protected int decryptBlock(byte[] src, int srcIndex, byte[] dst, int dstIndex)
      Decrypt the given input starting at the given offset and place the result in the provided buffer starting at the given offset.
      Parameters:
      src - The plaintext buffer
      srcIndex - An offset into src
      dst - The ciphertext buffer
      dstIndex - An offset into dst

    • F1

      protected final int F1(int D, int Kmi, int Kri)
      The first of the three processing functions for the encryption and decryption.
      Parameters:
      D - the input to be processed
      Kmi - the mask to be used from Km[n]
      Kri - the rotation value to be used

    • F2

      protected final int F2(int D, int Kmi, int Kri)
      The second of the three processing functions for the encryption and decryption.
      Parameters:
      D - the input to be processed
      Kmi - the mask to be used from Km[n]
      Kri - the rotation value to be used

    • F3

      protected final int F3(int D, int Kmi, int Kri)
      The third of the three processing functions for the encryption and decryption.
      Parameters:
      D - the input to be processed
      Kmi - the mask to be used from Km[n]
      Kri - the rotation value to be used

    • CAST_Encipher

      protected final void CAST_Encipher(int L0, int R0, int[] result)
      Does the 16 rounds to encrypt the block.
      Parameters:
      L0 - the LH-32bits of the plaintext block
      R0 - the RH-32bits of the plaintext block

    • CAST_Decipher

      protected final void CAST_Decipher(int L16, int R16, int[] result)

    • Bits32ToInts

      protected final void Bits32ToInts(int in, int[] b, int offset)

    • IntsTo32bits

      protected final int IntsTo32bits(int[] b, int i)

    • Bits32ToBytes

      protected final void Bits32ToBytes(int in, byte[] b, int offset)

    • BytesTo32bits

      protected final int BytesTo32bits(byte[] b, int i)