Java Doc for GOFBBlockCipher.java in  » Security » Bouncy-Castle » org » bouncycastle » crypto » modes » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Security » Bouncy Castle » org.bouncycastle.crypto.modes 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.bouncycastle.crypto.modes.GOFBBlockCipher

GOFBBlockCipher
public class GOFBBlockCipher implements BlockCipher(Code)
implements the GOST 28147 OFB counter mode (GCTR).


Field Summary
final static  intC1
    
final static  intC2
    
 intN3
    
 intN4
    
 booleanfirstStep
    

Constructor Summary
public  GOFBBlockCipher(BlockCipher cipher)
     Basic constructor.

Method Summary
public  StringgetAlgorithmName()
     return the algorithm name and mode.
public  intgetBlockSize()
     return the block size we are operating at (in bytes).
public  BlockCiphergetUnderlyingCipher()
     return the underlying block cipher that we are wrapping.
public  voidinit(boolean encrypting, CipherParameters params)
     Initialise the cipher and, possibly, the initialisation vector (IV).
public  intprocessBlock(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  voidreset()
     reset the feedback vector back to the IV and reset the underlying cipher.

Field Detail
C1
final static int C1(Code)



C2
final static int C2(Code)



N3
int N3(Code)



N4
int N4(Code)



firstStep
boolean firstStep(Code)




Constructor Detail
GOFBBlockCipher
public GOFBBlockCipher(BlockCipher cipher)(Code)
Basic constructor.
Parameters:
  cipher - the block cipher to be used as the basis of thecounter mode (must have a 64 bit block size).




Method Detail
getAlgorithmName
public String getAlgorithmName()(Code)
return the algorithm name and mode. the name of the underlying algorithm followed by "/GCTR"and the block size in bits



getBlockSize
public int getBlockSize()(Code)
return the block size we are operating at (in bytes). the block size we are operating at (in bytes).



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. An IV which is too short is handled in FIPS compliant fashion.
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 feedback vector back to the IV and reset the underlying cipher.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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