org.bouncycastle.crypto.modes
Class PGPCFBBlockCipher
java.lang.Object
org.bouncycastle.crypto.modes.PGPCFBBlockCipher
- BlockCipher
public class PGPCFBBlockCipher
extends java.lang.Object
Implements OpenPGP's rather strange version of Cipher-FeedBack (CFB) mode on top of a simple cipher. For further info see
RFC 2440.
String | getAlgorithmName() - return the algorithm name and mode.
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int | getBlockSize() - return the block size we are operating at.
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BlockCipher | getUnderlyingCipher() - return the underlying block cipher that we are wrapping.
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void | init(boolean forEncryption, CipherParameters params) - Initialise the cipher and, possibly, the initialisation vector (IV).
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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.
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void | reset() - reset the chaining vector back to the IV and reset the underlying
cipher.
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PGPCFBBlockCipher
public PGPCFBBlockCipher(BlockCipher cipher,
boolean inlineIv)
Basic constructor.
cipher
- the block cipher to be used as the basis of the
feedback mode.inlineIv
- if true this is for PGP CFB with a prepended iv.
getAlgorithmName
public String getAlgorithmName()
return the algorithm name and mode.
- getAlgorithmName in interface BlockCipher
- the name of the underlying algorithm followed by "/PGPCFB"
and the block size in bits.
getBlockSize
public int getBlockSize()
return the block size we are operating at.
- getBlockSize in interface BlockCipher
- the block size we are operating at (in bytes).
getUnderlyingCipher
public BlockCipher getUnderlyingCipher()
return the underlying block cipher that we are wrapping.
- the underlying block cipher that we are wrapping.
init
public void init(boolean forEncryption,
CipherParameters params)
throws IllegalArgumentException
Initialise the cipher and, possibly, the initialisation vector (IV).
If an IV isn't passed as part of the parameter, the IV will be all zeros.
An IV which is too short is handled in FIPS compliant fashion.
- init in interface BlockCipher
forEncryption
- if true the cipher is initialised for
encryption, if false for decryption.params
- the key and other data required by the cipher.
processBlock
public int processBlock(byte[] in,
int inOff,
byte[] out,
int outOff)
throws DataLengthException,
IllegalStateException
Process one block of input from the array in and write it to
the out array.
- 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.
- the number of bytes processed and produced.
DataLengthException
- if there isn't enough data in in, or
space in out.
reset
public void reset()
reset the chaining vector back to the IV and reset the underlying
cipher.
- reset in interface BlockCipher