Class SICBlockCipher
- java.lang.Object
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- org.gudy.bouncycastle.crypto.modes.SICBlockCipher
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- All Implemented Interfaces:
BlockCipher
public class SICBlockCipher extends java.lang.Object implements BlockCipher
Implements the Segmented Integer Counter (SIC) mode on top of a simple block cipher. This mode is also known as CTR mode.
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Field Summary
Fields Modifier and Type Field Description private int
blockSize
private BlockCipher
cipher
private byte[]
counter
private byte[]
counterOut
private boolean
encrypting
private byte[]
IV
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Constructor Summary
Constructors Constructor Description SICBlockCipher(BlockCipher c)
Basic constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.String
getAlgorithmName()
Return the name of the algorithm the cipher implements.int
getBlockSize()
Return the block size for this cipher (in bytes).BlockCipher
getUnderlyingCipher()
return the underlying block cipher that we are wrapping.void
init(boolean forEncryption, CipherParameters params)
Initialise the cipher.int
processBlock(byte[] in, int inOff, byte[] out, int outOff)
Process one block of input from the array in and write it to the out array.void
reset()
Reset the cipher.
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Field Detail
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cipher
private BlockCipher cipher
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blockSize
private int blockSize
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IV
private byte[] IV
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counter
private byte[] counter
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counterOut
private byte[] counterOut
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encrypting
private boolean encrypting
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Constructor Detail
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SICBlockCipher
public SICBlockCipher(BlockCipher c)
Basic constructor.- Parameters:
c
- the block cipher to be used.
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Method Detail
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getUnderlyingCipher
public BlockCipher getUnderlyingCipher()
return the underlying block cipher that we are wrapping.- Returns:
- the underlying block cipher that we are wrapping.
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init
public void init(boolean forEncryption, CipherParameters params) throws java.lang.IllegalArgumentException
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.- Throws:
java.lang.IllegalArgumentException
- if the params argument is inappropriate.
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getAlgorithmName
public java.lang.String 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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processBlock
public int processBlock(byte[] in, int inOff, byte[] out, int outOff) throws DataLengthException, java.lang.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.inOff
- offset into the in array the data starts at.out
- the array the output data will be copied into.outOff
- 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 in, or space in out.java.lang.IllegalStateException
- if the cipher isn't initialised.
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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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