Google

Bouncy Castle Cryptography 1.11 API Specification: Class IDEAEngine
Overview  Package   Class  Tree  Deprecated  Index  Help 
Bouncy Castle Cryptography 1.11
 PREV CLASS   NEXT CLASS FRAMES    NO FRAMES
SUMMARY:  INNER | FIELD | CONSTR | METHOD DETAIL:  FIELD | CONSTR | METHOD

org.bouncycastle.crypto.engines
Class IDEAEngine

java.lang.Object
  |
  +--org.bouncycastle.crypto.engines.IDEAEngine
All Implemented Interfaces:
BlockCipher
public class IDEAEngine
extends java.lang.Object
implements BlockCipher

A class that provides a basic International Data Encryption Algorithm (IDEA) engine.

This implementation is based on the "HOWTO: INTERNATIONAL DATA ENCRYPTION ALGORITHM" implementation summary by Fauzan Mirza (F.U.Mirza@sheffield.ac.uk). (baring 1 typo at the end of the mulinv function!).

It can be found at ftp://ftp.funet.fi/pub/crypt/cryptography/symmetric/idea/

Field Summary
protected static int BLOCK_SIZE
           
 
Constructor Summary
IDEAEngine()
          standard constructor.
 
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 an IDEA 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 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

BLOCK_SIZE

protected static final int BLOCK_SIZE
Constructor Detail

IDEAEngine

public IDEAEngine()
standard constructor.
Method Detail

init

public void init(boolean forEncryption,
                 CipherParameters params)
initialise an IDEA cipher.
Specified by:
init in interface BlockCipher
Parameters:
forEncryption - whether or not we are for encryption.
params - the parameters required to set up 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.
Specified by:
getAlgorithmName in interface BlockCipher
Following copied from interface: org.bouncycastle.crypto.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
Following copied from interface: org.bouncycastle.crypto.BlockCipher
Returns:
the block size for this cipher in bytes.

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
Following copied from interface: org.bouncycastle.crypto.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.
Throws:
DataLengthException - if there isn't enough data in in, or space in out.
java.lang.IllegalStateException - if the cipher isn't initialised.

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
Overview  Package   Class  Tree  Deprecated  Index  Help 
Bouncy Castle Cryptography 1.11
 PREV CLASS   NEXT CLASS FRAMES    NO FRAMES
SUMMARY:  INNER | FIELD | CONSTR | METHOD DETAIL:  FIELD | CONSTR | METHOD