gnu.javax.crypto.cipher
Class Serpent
- Cloneable, IBlockCipher, gnu.javax.crypto.cipher.IBlockCipherSpi
Serpent is a 32-round substitution-permutation network block cipher,
operating on 128-bit blocks and accepting keys of 128, 192, and 256 bits in
length. At each round the plaintext is XORed with a 128 bit portion of the
session key -- a 4224 bit key computed from the input key -- then one of
eight S-boxes are applied, and finally a simple linear transformation is
done. Decryption does the exact same thing in reverse order, and using the
eight inverses of the S-boxes.
Serpent was designed by Ross Anderson, Eli Biham, and Lars Knudsen as a
proposed cipher for the Advanced Encryption Standard.
Serpent can be sped up greatly by replacing S-box substitution with a
sequence of binary operations, and the optimal implementation depends upon
finding the fastest sequence of binary operations that reproduce this
substitution. This implementation uses the S-boxes discovered by
Dag Arne Osvik, which are optimized
for the Pentium family of processors.
References:
- Serpent: A
Candidate Block Cipher for the Advanced Encryption Standard.
Serpent()- Trivial zero-argument constructor.
|
Iterator<E> | blockSizes()- Returns an
Iterator over the supported block sizes.
|
Object | clone()- Returns a clone of this instance.
|
void | decrypt(byte[] in, int i, byte[] out, int o, Object K, int bs)
|
void | encrypt(byte[] in, int i, byte[] out, int o, Object K, int bs)
|
Iterator<E> | keySizes()- Returns an
Iterator over the supported key sizes.
|
Object | makeKey(byte[] kb, int blockSize)
|
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).
|
clone, currentBlockSize, decryptBlock, defaultBlockSize, defaultKeySize, encryptBlock, init, name, reset, selfTest, testKat, testKat |
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
Serpent
public Serpent()
Trivial zero-argument constructor.
decrypt
public void decrypt(byte[] in,
int i,
byte[] out,
int o,
Object K,
int bs)- decrypt in interface gnu.javax.crypto.cipher.IBlockCipherSpi
encrypt
public void encrypt(byte[] in,
int i,
byte[] out,
int o,
Object K,
int bs)- encrypt in interface gnu.javax.crypto.cipher.IBlockCipherSpi
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).
- selfTest in interface IBlockCipher
- selfTest in interface gnu.javax.crypto.cipher.IBlockCipherSpi
- selfTest in interface BaseCipher
true if the implementation passes simple
correctness tests. Returns false otherwise.
Serpent.java --
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