Package org.bouncycastle.crypto.engines
Class Shacal2Engine
java.lang.Object
org.bouncycastle.crypto.engines.Shacal2Engine
- All Implemented Interfaces:
BlockCipher
Block cipher Shacal2, designed by Helena Handschuh and David Naccache,
based on hash function SHA-256,
using SHA-256-Initialization-Values as data and SHA-256-Data as key.
A description of Shacal can be found at: https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.3.4066 Best known cryptanalytic (Wikipedia 11.2013): Related-key rectangle attack on 44-rounds (Jiqiang Lu, Jongsung Kim). Comments are related to SHA-256-Naming as described in FIPS PUB 180-2
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionReturn the name of the algorithm the cipher implements.int
Return the block size for this cipher (in bytes).void
init
(boolean _forEncryption, CipherParameters params) Initialise the cipher.int
processBlock
(byte[] in, int inOffset, byte[] out, int outOffset) Process one block of input from the array in and write it to the out array.void
reset()
Reset the cipher.void
setKey
(byte[] kb)
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Constructor Details
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Method Details
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reset
public void reset()Description copied from interface:BlockCipher
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 interfaceBlockCipher
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getAlgorithmName
Description copied from interface:BlockCipher
Return the name of the algorithm the cipher implements.- Specified by:
getAlgorithmName
in interfaceBlockCipher
- Returns:
- the name of the algorithm the cipher implements.
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getBlockSize
public int getBlockSize()Description copied from interface:BlockCipher
Return the block size for this cipher (in bytes).- Specified by:
getBlockSize
in interfaceBlockCipher
- Returns:
- the block size for this cipher in bytes.
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init
Description copied from interface:BlockCipher
Initialise the cipher.- Specified by:
init
in interfaceBlockCipher
- Parameters:
_forEncryption
- if true the cipher is initialised for encryption, if false for decryption.params
- the key and other data required by the cipher.- Throws:
IllegalArgumentException
- if the params argument is inappropriate.
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setKey
public void setKey(byte[] kb) -
processBlock
public int processBlock(byte[] in, int inOffset, byte[] out, int outOffset) throws DataLengthException, IllegalStateException Description copied from interface:BlockCipher
Process one block of input from the array in and write it to the out array.- Specified by:
processBlock
in interfaceBlockCipher
- Parameters:
in
- the array containing the input data.inOffset
- offset into the in array the data starts at.out
- the array the output data will be copied into.outOffset
- the offset into the out array the output will start at.- Returns:
- the number of bytes processed and produced.
- Throws:
DataLengthException
- if there isn't enough data in input , or space in out.IllegalStateException
- if the cipher isn't initialised.
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