org.cryptacular.adapter

Class BufferedBlockCipherAdapter

java.lang.Object

org.cryptacular.adapter.BufferedBlockCipherAdapter

All Implemented Interfaces:

BlockCipherAdapter, CipherAdapter

public class BufferedBlockCipherAdapter
extends Object
implements BlockCipherAdapter

Adapts a BufferedBlockCipher.

Author:

Middleware Services

Constructor Summary

Constructors

Constructor and Description
BufferedBlockCipherAdapter(org.bouncycastle.crypto.BufferedBlockCipher delegate) Creates a new instance that delegates to the given cipher.

Method Summary

Modifier and Type	Method and Description
int	doFinal(byte[] out, int outOff) Finish the encryption/decryption operation (e.g. apply padding).
int	getOutputSize(int len) Gets the size of the output buffer required to hold the output of an input buffer of the given size.
void	init(boolean forEncryption, org.bouncycastle.crypto.CipherParameters params) Initialize the underlying cipher.
int	processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) Process an array of bytes, producing output if necessary.
void	reset() Reset the cipher.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BufferedBlockCipherAdapter

public BufferedBlockCipherAdapter(org.bouncycastle.crypto.BufferedBlockCipher delegate)

Creates a new instance that delegates to the given cipher.

Parameters:

delegate - Adapted cipher.

Method Detail

getOutputSize

public int getOutputSize(int len)

Description copied from interface: BlockCipherAdapter

Gets the size of the output buffer required to hold the output of an input buffer of the given size.

Specified by:

getOutputSize in interface BlockCipherAdapter

Parameters:

len - Length of input buffer.

Returns:

Size of output buffer.

init

public void init(boolean forEncryption,
                 org.bouncycastle.crypto.CipherParameters params)
          throws CryptoException

Description copied from interface: CipherAdapter

Initialize the underlying cipher.

Specified by:

init in interface CipherAdapter

Parameters:

forEncryption - True for encryption mode, false for decryption mode.

params - Cipher initialization parameters.

Throws:

CryptoException - on underlying cipher initialization errors.

processBytes

public int processBytes(byte[] in,
                        int inOff,
                        int len,
                        byte[] out,
                        int outOff)
                 throws CryptoException

Description copied from interface: CipherAdapter

Process an array of bytes, producing output if necessary.

Specified by:

processBytes in interface CipherAdapter

Parameters:

in - Input data.

inOff - Offset at which the input data starts.

len - The number of bytes in the input data to process.

out - Array to receive any data produced by cipher.

outOff - Offset into output array.

Returns:

The number of bytes produced by the cipher.

Throws:

CryptoException - on underlying cipher data handling errors.

doFinal

public int doFinal(byte[] out,
                   int outOff)
            throws CryptoException

Description copied from interface: BlockCipherAdapter

Finish the encryption/decryption operation (e.g. apply padding).

Specified by:

doFinal in interface BlockCipherAdapter

Parameters:

out - Output buffer to receive final processing output.

outOff - Offset into output buffer where processed data should start.

Returns:

Number of bytes written to output buffer.

Throws:

CryptoException - on underlying cipher finalization errors.

reset

public void reset()

Description copied from interface: CipherAdapter

Reset the cipher. After resetting the cipher is in the same state as it was after the last init (if there was one).

Specified by:

reset in interface CipherAdapter