gnu.crypto.cipher
Class Blowfish

java.lang.Object
  |
  +--gnu.crypto.cipher.BaseCipher
        |
        +--gnu.crypto.cipher.Blowfish

All Implemented Interfaces:

java.lang.Cloneable, IBlockCipher, gnu.crypto.cipher.IBlockCipherSpi

public class Blowfish

extends BaseCipher

Blowfish is a 16-round, 64-bit Feistel cipher designed by Bruce Schneier. It accepts a variable-length key of up to 448 bits.

References:

1. Schneier, Bruce: Applied Cryptography, Second Edition, 336--339, 647--654 (1996 Bruce Schneier).
2. The Blowfish Encryption Algorithm.

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

Blowfish()

Method Summary

java.util.Iterator	blockSizes() Returns an Iterator over the supported block sizes.
java.lang.Object	clone() Returns a clone of this instance.
void	decrypt(byte[] in, int i, byte[] out, int o, java.lang.Object k, int bs) Decrypts exactly one block of ciphertext.
void	encrypt(byte[] in, int i, byte[] out, int o, java.lang.Object k, int bs) Encrypts exactly one block of plaintext.
java.util.Iterator	keySizes() Returns an Iterator over the supported key sizes.
java.lang.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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

Blowfish

public Blowfish()

Method Detail

clone

public java.lang.Object clone()

Description copied from interface: IBlockCipher

Returns a clone of this instance.

Specified by:

clone in interface IBlockCipher

Specified by:

clone in class BaseCipher

Returns:

a clone copy of this instance.

keySizes

public java.util.Iterator keySizes()

Description copied from interface: IBlockCipher

Returns an Iterator over the supported key sizes. Each element returned by this object is an Integer.

Returns:

an Iterator over the supported key sizes.

blockSizes

public java.util.Iterator blockSizes()

Description copied from interface: IBlockCipher

Returns an Iterator over the supported block sizes. Each element returned by this object is an Integer.

Returns:

an Iterator over the supported block sizes.

makeKey

public java.lang.Object makeKey(byte[] k,
                                int bs)

Description copied from interface: gnu.crypto.cipher.IBlockCipherSpi

Expands a user-supplied key material into a session key for a designated block size.

Parameters:

k - the user-supplied key material.

bs - the desired block size in bytes.

Returns:

an Object encapsulating the session key.

encrypt

public void encrypt(byte[] in,
                    int i,
                    byte[] out,
                    int o,
                    java.lang.Object k,
                    int bs)

Description copied from interface: gnu.crypto.cipher.IBlockCipherSpi

Encrypts exactly one block of plaintext.

Parameters:

in - the plaintext.

i - index of in from which to start considering data.

out - the ciphertext.

o - index of out from which to store the result.

k - the session key to use.

bs - the block size to use.

decrypt

public void decrypt(byte[] in,
                    int i,
                    byte[] out,
                    int o,
                    java.lang.Object k,
                    int bs)

Description copied from interface: gnu.crypto.cipher.IBlockCipherSpi

Decrypts exactly one block of ciphertext.

Parameters:

in - the ciphertext.

i - index of in from which to start considering data.

out - the plaintext.

o - index of out from which to store the result.

k - the session key to use.

bs - the block size to use.

selfTest

public boolean selfTest()

Description copied from interface: IBlockCipher

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

Overrides:

selfTest in class BaseCipher

Returns:

true if the implementation passes simple correctness tests. Returns false otherwise.