org.bouncycastle.crypto.engines

Class IDEAEngine

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/

Note: This algorithm is patented in the USA, Japan, and Europe including at least Austria, France, Germany, Italy, Netherlands, Spain, Sweden, Switzerland and the United Kingdom. Non-commercial use is free, however any commercial products are liable for royalties. Please see www.mediacrypt.com for further details. This announcement has been included at the request of the patent holders.

Field Summary

protected static int
BLOCK_SIZE

Constructor Summary

IDEAEngine()
standard constructor.

Method Summary

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.

Field Details

BLOCK_SIZE

protected static final int BLOCK_SIZE
Field Value:
8

Constructor Details

IDEAEngine

public IDEAEngine()
standard constructor.

Method Details

getAlgorithmName

public String getAlgorithmName()
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()
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)
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.

processBlock

public 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.
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()
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