Package org.bouncycastle.crypto.engines
Class TnepresEngine
- java.lang.Object
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- org.bouncycastle.crypto.engines.SerpentEngineBase
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- org.bouncycastle.crypto.engines.TnepresEngine
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- All Implemented Interfaces:
BlockCipher
public final class TnepresEngine extends SerpentEngineBase
Tnepres is a 128-bit 32-round block cipher with variable key lengths, including 128, 192 and 256 bit keys conjectured to be at least as secure as three-key triple-DES.Tnepres is based on Serpent which was designed by Ross Anderson, Eli Biham and Lars Knudsen as a candidate algorithm for the NIST AES Quest. Unfortunately there was an endianness issue with test vectors in the AES submission and the resulting confusion lead to the Tnepres cipher as well, which is a byte swapped version of Serpent.
For full details see The Serpent home page
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Field Summary
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Fields inherited from class org.bouncycastle.crypto.engines.SerpentEngineBase
BLOCK_SIZE, encrypting, wKey, X0, X1, X2, X3
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Constructor Summary
Constructors Constructor Description TnepresEngine()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected voiddecryptBlock(byte[] input, int inOff, byte[] output, int outOff)Decrypt one block of ciphertext.protected voidencryptBlock(byte[] input, int inOff, byte[] output, int outOff)Encrypt one block of plaintext.java.lang.StringgetAlgorithmName()Return the name of the algorithm the cipher implements.protected int[]makeWorkingKey(byte[] key)Expand a user-supplied key material into a session key.-
Methods inherited from class org.bouncycastle.crypto.engines.SerpentEngineBase
getBlockSize, ib0, ib1, ib2, ib3, ib4, ib5, ib6, ib7, init, inverseLT, LT, processBlock, reset, rotateLeft, rotateRight, sb0, sb1, sb2, sb3, sb4, sb5, sb6, sb7
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Method Detail
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getAlgorithmName
public java.lang.String getAlgorithmName()
Description copied from interface:BlockCipherReturn the name of the algorithm the cipher implements.- Specified by:
getAlgorithmNamein interfaceBlockCipher- Overrides:
getAlgorithmNamein classSerpentEngineBase- Returns:
- the name of the algorithm the cipher implements.
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makeWorkingKey
protected int[] makeWorkingKey(byte[] key) throws java.lang.IllegalArgumentExceptionExpand a user-supplied key material into a session key.- Specified by:
makeWorkingKeyin classSerpentEngineBase- Parameters:
key- The user-key bytes (multiples of 4) to use.- Throws:
java.lang.IllegalArgumentException
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encryptBlock
protected void encryptBlock(byte[] input, int inOff, byte[] output, int outOff)Encrypt one block of plaintext.- Specified by:
encryptBlockin classSerpentEngineBase- Parameters:
input- the array containing the input data.inOff- offset into the in array the data starts at.output- the array the output data will be copied into.outOff- the offset into the out array the output will start at.
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decryptBlock
protected void decryptBlock(byte[] input, int inOff, byte[] output, int outOff)Decrypt one block of ciphertext.- Specified by:
decryptBlockin classSerpentEngineBase- Parameters:
input- the array containing the input data.inOff- offset into the in array the data starts at.output- the array the output data will be copied into.outOff- the offset into the out array the output will start at.
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