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java.lang.Objectorg.clazzes.optional.sec.CBCCipher
public class CBCCipher
CBC cipher mode for symmetric ciphers. copied from bouncycastle.
Constructor Summary | |
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CBCCipher(BlockCipher cipher)
Basic constructor. |
Method Summary | |
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java.lang.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(byte[] iv,
boolean forEncryption)
Initialize the cipher and, possibly, the initialization 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 CBCCipher(BlockCipher cipher)
cipher
- the block cipher to be used as the basis of chaining,
which should have been initialized..Method Detail |
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public BlockCipher getUnderlyingCipher()
getUnderlyingCipher
in interface BlockCipher
public void init(byte[] iv, boolean forEncryption)
init
in interface BlockCipher
iv
- The key for basic ciphers or initialization vector for cipher modes
or null
, if no key or initialization vector is needed.forEncryption
- Whether we want to encrypt. false
means to set up this cipher for decryption.public java.lang.String getAlgorithmName()
getAlgorithmName
in interface BlockCipher
public int getBlockSize()
getBlockSize
in interface BlockCipher
public int processBlock(byte[] in, int inOff, byte[] out, int outOff)
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.
java.lang.IllegalStateException
- if the cipher isn't initialised.public void reset()
reset
in interface BlockCipher
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