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java.lang.Object org.bouncycastle.crypto.macs.MacCFBBlockCipher
class MacCFBBlockCipher
implements a Cipher-FeedBack (CFB) mode on top of a simple cipher.
Field Summary | |
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private int |
blockSize
|
private byte[] |
cfbOutV
|
private byte[] |
cfbV
|
private BlockCipher |
cipher
|
private byte[] |
IV
|
Constructor Summary | |
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MacCFBBlockCipher(BlockCipher cipher,
int bitBlockSize)
Basic constructor. |
Method Summary | |
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java.lang.String |
getAlgorithmName()
return the algorithm name and mode. |
int |
getBlockSize()
return the block size we are operating at. |
(package private) void |
getMacBlock(byte[] mac)
|
void |
init(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 |
Field Detail |
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private byte[] IV
private byte[] cfbV
private byte[] cfbOutV
private int blockSize
private BlockCipher cipher
Constructor Detail |
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public MacCFBBlockCipher(BlockCipher cipher, int bitBlockSize)
cipher
- the block cipher to be used as the basis of the
feedback mode.blockSize
- the block size in bits (note: a multiple of 8)Method Detail |
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public void init(CipherParameters params) throws java.lang.IllegalArgumentException
param
- the key and other data required by the cipher.
java.lang.IllegalArgumentException
- if the params argument is
inappropriate.public java.lang.String getAlgorithmName()
public int getBlockSize()
public int processBlock(byte[] in, int inOff, byte[] out, int outOff) throws DataLengthException, java.lang.IllegalStateException
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.
java.lang.IllegalStateException
- if the cipher isn't initialised.public void reset()
void getMacBlock(byte[] mac)
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