Class IESEngine

java.lang.Object

org.gudy.bouncycastle.crypto.engines.IESEngine

public class IESEngine
extends Object

support class for constructing intergrated encryption ciphers for doing basic message exchanges on top of key agreement ciphers

Field Summary

Fields

Modifier and Type	Field	Description
(package private) BasicAgreement	agree
(package private) BufferedBlockCipher	cipher
(package private) boolean	forEncryption
(package private) DerivationFunction	kdf
(package private) Mac	mac
(package private) byte[]	macBuf
(package private) IESParameters	param
(package private) CipherParameters	privParam
(package private) CipherParameters	pubParam

Constructor Summary

Constructors

Constructor	Description
IESEngine(BasicAgreement agree, DerivationFunction kdf, Mac mac)	set up for use with stream mode, where the key derivation function is used to provide a stream of bytes to xor with the message.
IESEngine(BasicAgreement agree, DerivationFunction kdf, Mac mac, BufferedBlockCipher cipher)	set up for use in conjunction with a block cipher to handle the message.

Method Summary

Modifier and Type	Method	Description
private byte[]	decryptBlock(byte[] in_enc, int inOff, int inLen, byte[] z)
private byte[]	encryptBlock(byte[] in, int inOff, int inLen, byte[] z)
void	init(boolean forEncryption, CipherParameters privParam, CipherParameters pubParam, CipherParameters param)	Initialise the encryptor.
byte[]	processBlock(byte[] in, int inOff, int inLen)

Methods inherited from class Object

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

Field Details

agree

BasicAgreement agree

kdf

DerivationFunction kdf

mac

Mac mac

cipher

BufferedBlockCipher cipher

macBuf

byte[] macBuf

forEncryption

boolean forEncryption

privParam

CipherParameters privParam

pubParam

CipherParameters pubParam

param

IESParameters param

Constructor Details

IESEngine

public IESEngine(BasicAgreement agree,
 DerivationFunction kdf,
 Mac mac)

set up for use with stream mode, where the key derivation function is used to provide a stream of bytes to xor with the message.

Parameters:

agree - the key agreement used as the basis for the encryption

kdf - the key derivation function used for byte generation

mac - the message authentication code generator for the message

IESEngine

public IESEngine(BasicAgreement agree,
 DerivationFunction kdf,
 Mac mac,
 BufferedBlockCipher cipher)

set up for use in conjunction with a block cipher to handle the message.

Parameters:

agree - the key agreement used as the basis for the encryption

kdf - the key derivation function used for byte generation

mac - the message authentication code generator for the message

cipher - the cipher to used for encrypting the message

Method Details

init

public void init(boolean forEncryption,
 CipherParameters privParam,
 CipherParameters pubParam,
 CipherParameters param)

Initialise the encryptor.

Parameters:

forEncryption - whether or not this is encryption/decryption.

privParam - our private key parameters

pubParam - the recipient's/sender's public key parameters

param - encoding and derivation parameters.

decryptBlock

private byte[] decryptBlock(byte[] in_enc,
 int inOff,
 int inLen,
 byte[] z)
                     throws InvalidCipherTextException

Throws:

InvalidCipherTextException

encryptBlock

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

Throws:

InvalidCipherTextException

processBlock

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

Throws:

InvalidCipherTextException