org.bouncycastle.tls.crypto.impl.jcajce

Class JceBlockCipherWithCBCImplicitIVImpl

java.lang.Object

org.bouncycastle.tls.crypto.impl.jcajce.JceBlockCipherWithCBCImplicitIVImpl

All Implemented Interfaces:

TlsBlockCipherImpl

public class JceBlockCipherWithCBCImplicitIVImpl
extends java.lang.Object
implements TlsBlockCipherImpl

A basic wrapper for a JCE Cipher class to provide the needed block cipher functionality for TLS where the cipher requires the IV to be continued between calls.

Constructor Summary

Constructors

Constructor and Description
JceBlockCipherWithCBCImplicitIVImpl(javax.crypto.Cipher cipher, java.lang.String algorithm, boolean isEncrypting)

Method Summary

Modifier and Type	Method and Description
int	doFinal(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset) Perform the cipher encryption/decryption returning the output in output.
int	getBlockSize() Return the blocksize (in bytes) of the underlying block cipher.
void	init(byte[] iv, int ivOff, int ivLen) Initialise the parameters for operator.
void	setKey(byte[] key, int keyOff, int keyLen) Set the key to be used by the block cipher implementation supporting this service.

Methods inherited from class java.lang.Object

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

Constructor Detail

JceBlockCipherWithCBCImplicitIVImpl

public JceBlockCipherWithCBCImplicitIVImpl(javax.crypto.Cipher cipher,
                                           java.lang.String algorithm,
                                           boolean isEncrypting)
                                    throws java.security.GeneralSecurityException

Throws:

java.security.GeneralSecurityException

Method Detail

setKey

public void setKey(byte[] key,
                   int keyOff,
                   int keyLen)

Description copied from interface: TlsBlockCipherImpl

Set the key to be used by the block cipher implementation supporting this service.

Specified by:

setKey in interface TlsBlockCipherImpl

Parameters:

key - array holding the block cipher key.

keyOff - offset into the array the key starts at.

keyLen - length of the key in the array.

init

public void init(byte[] iv,
                 int ivOff,
                 int ivLen)

Description copied from interface: TlsBlockCipherImpl

Initialise the parameters for operator.

Specified by:

init in interface TlsBlockCipherImpl

Parameters:

iv - array holding the initialization vector (IV).

ivOff - offset into the array the IV starts at.

ivLen - length of the IV in the array.

doFinal

public int doFinal(byte[] input,
                   int inputOffset,
                   int inputLength,
                   byte[] output,
                   int outputOffset)

Description copied from interface: TlsBlockCipherImpl

Perform the cipher encryption/decryption returning the output in output.

Note: we have to use doFinal() here as it is the only way to guarantee output from the underlying cipher.

Specified by:

doFinal in interface TlsBlockCipherImpl

Parameters:

input - array holding input data to the cipher.

inputOffset - offset into input array data starts at.

inputLength - length of the input data in the array.

output - array to hold the cipher output.

outputOffset - offset into output array to start saving output.

Returns:

the amount of data written to output.

getBlockSize

public int getBlockSize()

Description copied from interface: TlsBlockCipherImpl

Return the blocksize (in bytes) of the underlying block cipher.

Specified by:

getBlockSize in interface TlsBlockCipherImpl

Returns:

the cipher's blocksize.