Class PKCS1Encoding

java.lang.Object

org.gudy.bouncycastle.crypto.encodings.PKCS1Encoding

All Implemented Interfaces:

AsymmetricBlockCipher

public class PKCS1Encoding
extends Object
implements AsymmetricBlockCipher

this does your basic PKCS 1 v1.5 padding - whether or not you should be using this depends on your application - see PKCS1 Version 2 for details.

Field Summary

Fields

Modifier and Type	Field	Description
private AsymmetricBlockCipher	engine
private boolean	forEncryption
private boolean	forPrivateKey
private static int	HEADER_LENGTH
private SecureRandom	random

Constructor Summary

Constructors

Constructor	Description
PKCS1Encoding(AsymmetricBlockCipher cipher)

Method Summary

Modifier and Type	Method	Description
private byte[]	decodeBlock(byte[] in, int inOff, int inLen)
private byte[]	encodeBlock(byte[] in, int inOff, int inLen)
int	getInputBlockSize()	returns the largest size an input block can be.
int	getOutputBlockSize()	returns the maximum size of the block produced by this cipher.
AsymmetricBlockCipher	getUnderlyingCipher()
void	init(boolean forEncryption, CipherParameters param)	initialise the cipher.
byte[]	processBlock(byte[] in, int inOff, int inLen)	process the block of len bytes stored in in from offset inOff.

Methods inherited from class Object

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

Field Details

HEADER_LENGTH

private static int HEADER_LENGTH

random

private SecureRandom random

engine

private AsymmetricBlockCipher engine

forEncryption

private boolean forEncryption

forPrivateKey

private boolean forPrivateKey

Constructor Details

PKCS1Encoding

public PKCS1Encoding(AsymmetricBlockCipher cipher)

Method Details

getUnderlyingCipher

public AsymmetricBlockCipher getUnderlyingCipher()

init

public void init(boolean forEncryption,
 CipherParameters param)

Description copied from interface: AsymmetricBlockCipher

initialise the cipher.

Specified by:

init in interface AsymmetricBlockCipher

Parameters:

forEncryption - if true the cipher is initialised for encryption, if false for decryption.

param - the key and other data required by the cipher.

getInputBlockSize

public int getInputBlockSize()

Description copied from interface: AsymmetricBlockCipher

returns the largest size an input block can be.

Specified by:

getInputBlockSize in interface AsymmetricBlockCipher

Returns:

maximum size for an input block.

getOutputBlockSize

public int getOutputBlockSize()

Description copied from interface: AsymmetricBlockCipher

returns the maximum size of the block produced by this cipher.

Specified by:

getOutputBlockSize in interface AsymmetricBlockCipher

Returns:

maximum size of the output block produced by the cipher.

processBlock

public byte[] processBlock(byte[] in,
 int inOff,
 int inLen)
                    throws InvalidCipherTextException

Description copied from interface: AsymmetricBlockCipher

process the block of len bytes stored in in from offset inOff.

Specified by:

processBlock in interface AsymmetricBlockCipher

Parameters:

in - the input data

inOff - offset into the in array where the data starts

inLen - the length of the block to be processed.

Returns:

the resulting byte array of the encryption/decryption process.

Throws:

InvalidCipherTextException - data decrypts improperly.

encodeBlock

private byte[] encodeBlock(byte[] in,
 int inOff,
 int inLen)
                    throws InvalidCipherTextException

Throws:

InvalidCipherTextException

decodeBlock

private byte[] decodeBlock(byte[] in,
 int inOff,
 int inLen)
                    throws InvalidCipherTextException

Throws:

InvalidCipherTextException - if the decrypted block is not in PKCS1 format.