| java.lang.Object
 org.bouncycastle.crypto.modes.CBCBlockCipher
| CBCBlockCipher | | public class CBCBlockCipher implements BlockCipher(Code) | | implements Cipher-Block-Chaining (CBC) mode on top of a simple cipher.
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| Method Summary | |
| public String | getAlgorithmName()
return the algorithm name and mode. | | public int | getBlockSize()
return the block size of the underlying cipher. | | public BlockCipher | getUnderlyingCipher()
return the underlying block cipher that we are wrapping. | | public void | init(boolean encrypting, CipherParameters params)
Initialise the cipher and, possibly, the initialisation vector (IV). | | public 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.
Parameters:
in - the array containing the input data.
Parameters:
inOff - offset into the in array the data starts at.
Parameters:
out - the array the output data will be copied into.
Parameters:
outOff - the offset into the out array the output will start at.
exception:
DataLengthException - if there isn't enough data in in, orspace in out.
exception:
IllegalStateException - if the cipher isn't initialised. | | public void | reset()
reset the chaining vector back to the IV and reset the underlying
cipher. |
| CBCBlockCipher | | public CBCBlockCipher(BlockCipher cipher)(Code) | | Basic constructor.
Parameters:
cipher - the block cipher to be used as the basis of chaining. |
| getAlgorithmName | | public String getAlgorithmName()(Code) | | return the algorithm name and mode.
the name of the underlying algorithm followed by "/CBC". |
| getBlockSize | | public int getBlockSize()(Code) | | return the block size of the underlying cipher.
the block size of the underlying cipher. |
| getUnderlyingCipher | | public BlockCipher getUnderlyingCipher()(Code) | | return the underlying block cipher that we are wrapping.
the underlying block cipher that we are wrapping. |
| init | | public void init(boolean encrypting, CipherParameters params) throws IllegalArgumentException(Code) | | 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.
Parameters:
encrypting - if true the cipher is initialised forencryption, if false for decryption.
Parameters:
params - the key and other data required by the cipher.
exception:
IllegalArgumentException - if the params argument isinappropriate. |
| processBlock | | public int processBlock(byte[] in, int inOff, byte[] out, int outOff) throws DataLengthException, IllegalStateException(Code) | | Process one block of input from the array in and write it to
the out array.
Parameters:
in - the array containing the input data.
Parameters:
inOff - offset into the in array the data starts at.
Parameters:
out - the array the output data will be copied into.
Parameters:
outOff - the offset into the out array the output will start at.
exception:
DataLengthException - if there isn't enough data in in, orspace in out.
exception:
IllegalStateException - if the cipher isn't initialised. the number of bytes processed and produced. |
| reset | | public void reset()(Code) | | reset the chaining vector back to the IV and reset the underlying
cipher.
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