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java.lang.Object org.apache.geronimo.util.crypto.modes.CBCBlockCipher
public class CBCBlockCipher
implements Cipher-Block-Chaining (CBC) mode on top of a simple cipher.
Constructor Summary | |
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CBCBlockCipher(BlockCipher cipher)
Basic constructor. |
Method Summary | |
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String |
getAlgorithmName()
return the algorithm name and mode. |
int |
getBlockSize()
return the block size of the underlying cipher. |
BlockCipher |
getUnderlyingCipher()
return the underlying block cipher that we are wrapping. |
void |
init(boolean encrypting,
CipherParameters params)
Initialise the cipher and, possibly, the initialisation vector (IV). |
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 chaining vector back to the IV and reset the underlying cipher. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public CBCBlockCipher(BlockCipher cipher)
cipher
- the block cipher to be used as the basis of chaining.Method Detail |
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public BlockCipher getUnderlyingCipher()
public void init(boolean encrypting, CipherParameters params) throws IllegalArgumentException
init
in interface BlockCipher
encrypting
- if true the cipher is initialised for
encryption, if false for decryption.params
- the key and other data required by the cipher.
IllegalArgumentException
- if the params argument is
inappropriate.public String getAlgorithmName()
getAlgorithmName
in interface BlockCipher
public int getBlockSize()
getBlockSize
in interface BlockCipher
public int processBlock(byte[] in, int inOff, byte[] out, int outOff) throws DataLengthException, IllegalStateException
processBlock
in interface BlockCipher
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.
DataLengthException
- if there isn't enough data in in, or
space in out.
IllegalStateException
- if the cipher isn't initialised.public void reset()
reset
in interface BlockCipher
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