org.bouncycastle.crypto.modes

Class PaddedBlockCipher

java.lang.Object

org.bouncycastle.crypto.BufferedBlockCipher

org.bouncycastle.crypto.DefaultBufferedBlockCipher

org.bouncycastle.crypto.modes.PaddedBlockCipher

Deprecated.

use org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher instead.

public class PaddedBlockCipher
extends DefaultBufferedBlockCipher

A wrapper class that allows block ciphers to be used to process data in a piecemeal fashion with PKCS5/PKCS7 padding. The PaddedBlockCipher outputs a block only when the buffer is full and more data is being added, or on a doFinal (unless the current block in the buffer is a pad block). The padding mechanism used is the one outlined in PKCS5/PKCS7.

Field Summary

Fields inherited from class org.bouncycastle.crypto.DefaultBufferedBlockCipher

buf, bufOff, cipher, forEncryption, mbCipher, partialBlockOkay, pgpCFB

Constructor Summary

Constructors

Constructor and Description
PaddedBlockCipher(BlockCipher cipher) Deprecated. Create a buffered block cipher with, or without, padding.

Method Summary

Modifier and Type	Method and Description
int	doFinal(byte[] out, int outOff) Deprecated. Process the last block in the buffer.
int	getOutputSize(int len) Deprecated. return the size of the output buffer required for an update plus a doFinal with an input of len bytes.
int	getUpdateOutputSize(int len) Deprecated. return the size of the output buffer required for an update an input of len bytes.
int	processByte(byte in, byte[] out, int outOff) Deprecated. process a single byte, producing an output block if neccessary.
int	processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) Deprecated. process an array of bytes, producing output if necessary.

Methods inherited from class org.bouncycastle.crypto.DefaultBufferedBlockCipher

getBlockSize, getUnderlyingCipher, init, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

PaddedBlockCipher

public PaddedBlockCipher(BlockCipher cipher)

Deprecated.

Create a buffered block cipher with, or without, padding.

Parameters:

cipher - the underlying block cipher this buffering object wraps.

Method Detail

getOutputSize

public int getOutputSize(int len)

Deprecated.

return the size of the output buffer required for an update plus a doFinal with an input of len bytes.

Overrides:

getOutputSize in class DefaultBufferedBlockCipher

Parameters:

len - the length of the input.

Returns:

the space required to accommodate a call to update and doFinal with len bytes of input.

getUpdateOutputSize

public int getUpdateOutputSize(int len)

Deprecated.

return the size of the output buffer required for an update an input of len bytes.

Overrides:

getUpdateOutputSize in class DefaultBufferedBlockCipher

Parameters:

len - the length of the input.

Returns:

the space required to accommodate a call to update with len bytes of input.

processByte

public int processByte(byte in,
                       byte[] out,
                       int outOff)
                throws DataLengthException,
                       java.lang.IllegalStateException

Deprecated.

process a single byte, producing an output block if neccessary.

Overrides:

processByte in class DefaultBufferedBlockCipher

Parameters:

in - the input byte.

out - the space for any output that might be produced.

outOff - the offset from which the output will be copied.

Returns:

the number of output bytes copied to out.

Throws:

DataLengthException - if there isn't enough space in out.

java.lang.IllegalStateException - if the cipher isn't initialised.

processBytes

public int processBytes(byte[] in,
                        int inOff,
                        int len,
                        byte[] out,
                        int outOff)
                 throws DataLengthException,
                        java.lang.IllegalStateException

Deprecated.

process an array of bytes, producing output if necessary.

Overrides:

processBytes in class DefaultBufferedBlockCipher

Parameters:

in - the input byte array.

inOff - the offset at which the input data starts.

len - the number of bytes to be copied out of the input array.

out - the space for any output that might be produced.

outOff - the offset from which the output will be copied.

Returns:

the number of output bytes copied to out.

Throws:

DataLengthException - if there isn't enough space in out.

java.lang.IllegalStateException - if the cipher isn't initialised.

doFinal

public int doFinal(byte[] out,
                   int outOff)
            throws DataLengthException,
                   java.lang.IllegalStateException,
                   InvalidCipherTextException

Deprecated.

Process the last block in the buffer. If the buffer is currently full and padding needs to be added a call to doFinal will produce 2 * getBlockSize() bytes.

Overrides:

doFinal in class DefaultBufferedBlockCipher

Parameters:

out - the array the block currently being held is copied into.

outOff - the offset at which the copying starts.

Returns:

the number of output bytes copied to out.

Throws:

DataLengthException - if there is insufficient space in out for the output or we are decrypting and the input is not block size aligned.

java.lang.IllegalStateException - if the underlying cipher is not initialised.

InvalidCipherTextException - if padding is expected and not found.