org.bouncycastle.pqc.crypto.mceliece

Class McElieceFujisakiCipher

java.lang.Object

org.bouncycastle.pqc.crypto.mceliece.McElieceFujisakiCipher

All Implemented Interfaces:

MessageEncryptor

public class McElieceFujisakiCipher
extends Object
implements MessageEncryptor

This class implements the Fujisaki/Okamoto conversion of the McEliecePKCS. Fujisaki and Okamoto propose hybrid encryption that merges a symmetric encryption scheme which is secure in the find-guess model with an asymmetric one-way encryption scheme which is sufficiently probabilistic to obtain a public key cryptosystem which is CCA2-secure. For details, see D. Engelbert, R. Overbeck, A. Schmidt, "A summary of the development of the McEliece Cryptosystem", technical report.

Field Summary

Fields

Modifier and Type	Field and Description
static String	OID The OID of the algorithm.

Constructor Summary

Constructors

Constructor and Description
McElieceFujisakiCipher()

Method Summary

Methods

Modifier and Type	Method and Description
int	getKeySize(McElieceCCA2KeyParameters key)
void	init(boolean forSigning, CipherParameters param)
void	initCipherDecrypt(McElieceCCA2PrivateKeyParameters privKey)
byte[]	messageDecrypt(byte[] input)
byte[]	messageEncrypt(byte[] input)

Methods inherited from class java.lang.Object

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

Field Detail

OID

public static final String OID

The OID of the algorithm.

See Also:

Constant Field Values

Constructor Detail

McElieceFujisakiCipher

public McElieceFujisakiCipher()

Method Detail

init

public void init(boolean forSigning,
        CipherParameters param)

Specified by:

init in interface MessageEncryptor

Parameters:

forSigning - true if we are encrypting a signature, false otherwise.

param - key parameters for encryption or decryption.

getKeySize

public int getKeySize(McElieceCCA2KeyParameters key)
               throws IllegalArgumentException

Throws:

IllegalArgumentException

initCipherDecrypt

public void initCipherDecrypt(McElieceCCA2PrivateKeyParameters privKey)

messageEncrypt

public byte[] messageEncrypt(byte[] input)
                      throws Exception

Specified by:

messageEncrypt in interface MessageEncryptor

Parameters:

input - the message to be signed.

Throws:

Exception

messageDecrypt

public byte[] messageDecrypt(byte[] input)
                      throws Exception

Specified by:

messageDecrypt in interface MessageEncryptor

Parameters:

input - the cipher text of the message

Throws:

Exception