gnu.crypto.cipher

Class Rijndael

Implemented Interfaces:
Cloneable, IBlockCipher, IBlockCipherSpi

public final class Rijndael
extends BaseCipher

Rijndael --pronounced Reindaal-- is the AES. It is a variable block-size (128-, 192- and 256-bit), variable key-size (128-, 192- and 256-bit) symmetric key block cipher.

References:

  1. The Rijndael Block Cipher - AES Proposal.
    Vincent Rijmen and Joan Daemen.
Version:
$Revision: 1.9 $

Field Summary

Fields inherited from class gnu.crypto.cipher.BaseCipher

currentBlockSize, currentKey, defaultBlockSize, defaultKeySize, lock, name

Fields inherited from interface gnu.crypto.cipher.IBlockCipher

CIPHER_BLOCK_SIZE, KEY_MATERIAL

Constructor Summary

Rijndael()
Trivial 0-arguments constructor.

Method Summary

Iterator
blockSizes()
Returns an Iterator over the supported block sizes.
Object
clone()
void
decrypt(byte[] in, int i, byte[] out, int j, Object k, int bs)
Decrypts exactly one block of ciphertext.
void
encrypt(byte[] in, int i, byte[] out, int j, Object k, int bs)
Encrypts exactly one block of plaintext.
static int
getRounds(int ks, int bs)
Returns the number of rounds for a given Rijndael's key and block sizes.
Iterator
keySizes()
Returns an Iterator over the supported key sizes.
Object
makeKey(byte[] k, int bs)
Expands a user-supplied key material into a session key for a designated block size.
boolean
selfTest()
A correctness test that consists of basic symmetric encryption / decryption test(s) for all supported block and key sizes, as well as one (1) variable key Known Answer Test (KAT).

Methods inherited from class gnu.crypto.cipher.BaseCipher

clone, currentBlockSize, decryptBlock, defaultBlockSize, defaultKeySize, encryptBlock, init, name, reset, selfTest, testKat, testKat

Constructor Details

Rijndael

public Rijndael()
Trivial 0-arguments constructor.

Method Details

blockSizes

public Iterator blockSizes()
Returns an Iterator over the supported block sizes. Each element returned by this object is a Integer.
Specified by:
blockSizes in interface IBlockCipher
blockSizes in interface IBlockCipherSpi
Returns:
an Iterator over the supported block sizes.

clone

public Object clone()
Specified by:
clone in interface IBlockCipher
Overrides:
clone in interface BaseCipher

decrypt

public void decrypt(byte[] in,
                    int i,
                    byte[] out,
                    int j,
                    Object k,
                    int bs)
Decrypts exactly one block of ciphertext.
Specified by:
decrypt in interface IBlockCipherSpi
Parameters:
in - the ciphertext.
out - the plaintext.
k - the session key to use.
bs - the block size to use.

encrypt

public void encrypt(byte[] in,
                    int i,
                    byte[] out,
                    int j,
                    Object k,
                    int bs)
Encrypts exactly one block of plaintext.
Specified by:
encrypt in interface IBlockCipherSpi
Parameters:
in - the plaintext.
out - the ciphertext.
k - the session key to use.
bs - the block size to use.

getRounds

public static int getRounds(int ks,
                            int bs)
Returns the number of rounds for a given Rijndael's key and block sizes.
Parameters:
ks - the size of the user key material in bytes.
bs - the desired block size in bytes.
Returns:
the number of rounds for a given Rijndael's key and block sizes.

keySizes

public Iterator keySizes()
Returns an Iterator over the supported key sizes. Each element returned by this object is a Integer.
Specified by:
keySizes in interface IBlockCipher
keySizes in interface IBlockCipherSpi
Returns:
an Iterator over the supported key sizes.

makeKey

public Object makeKey(byte[] k,
                      int bs)
            throws InvalidKeyException
Expands a user-supplied key material into a session key for a designated block size.
Specified by:
makeKey in interface IBlockCipherSpi
Parameters:
k - the 128/192/256-bit user-key to use.
bs - the block size in bytes of this Rijndael.
Returns:
an Object encapsulating the session key.

selfTest

public boolean selfTest()
A correctness test that consists of basic symmetric encryption / decryption test(s) for all supported block and key sizes, as well as one (1) variable key Known Answer Test (KAT).
Specified by:
selfTest in interface IBlockCipher
selfTest in interface IBlockCipherSpi
Overrides:
selfTest in interface BaseCipher
Returns:
true if the implementation passes simple correctness tests. Returns false otherwise.

Copyright © 2001, 2002, 2003 Free Software Foundation, Inc. All Rights Reserved.