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Bouncy Castle Cryptography 1.45 | ||||||||
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java.lang.Objectorg.bouncycastle.crypto.modes.OFBBlockCipher
public class OFBBlockCipher
implements a Output-FeedBack (OFB) mode on top of a simple cipher.
| Constructor Summary | |
|---|---|
OFBBlockCipher(BlockCipher cipher,
int blockSize)
Basic constructor. |
|
| Method Summary | |
|---|---|
java.lang.String |
getAlgorithmName()
return the algorithm name and mode. |
int |
getBlockSize()
return the block size we are operating at (in bytes). |
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 feedback vector back to the IV and reset the underlying cipher. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public OFBBlockCipher(BlockCipher cipher,
int blockSize)
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 |
|---|
public BlockCipher getUnderlyingCipher()
public void init(boolean encrypting,
CipherParameters params)
throws java.lang.IllegalArgumentException
init in interface BlockCipherencrypting - if true the cipher is initialised for
encryption, if false for decryption.params - the key and other data required by the cipher.
java.lang.IllegalArgumentException - if the params argument is
inappropriate.public java.lang.String getAlgorithmName()
getAlgorithmName in interface BlockCipherpublic int getBlockSize()
getBlockSize in interface BlockCipher
public int processBlock(byte[] in,
int inOff,
byte[] out,
int outOff)
throws DataLengthException,
java.lang.IllegalStateException
processBlock in interface BlockCipherin - 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()
reset in interface BlockCipher
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