Package org.bouncycastle.pqc.legacy.crypto.mceliece

Class McElieceFujisakiCipher

java.lang.Object

org.bouncycastle.pqc.legacy.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 McEliece-Type Cryptosystems and their Security", technical report. https://www.degruyter.com/document/doi/10.1515/JMC.2007.009/html

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
McElieceFujisakiCipher()

Method Summary

Modifier and Type	Method	Description
int	getKeySize(McElieceCCA2KeyParameters key)
void	init(boolean forEncryption, CipherParameters param)
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 Details

OID

public static final String OID

The OID of the algorithm.

See Also:

• Constant Field Values

Constructor Details

McElieceFujisakiCipher

public McElieceFujisakiCipher()

Method Details

init

public void init(boolean forEncryption,
 CipherParameters param)

Specified by:

init in interface MessageEncryptor

Parameters:

forEncryption - 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

messageEncrypt

public byte[] messageEncrypt(byte[] input)

Specified by:

messageEncrypt in interface MessageEncryptor

Parameters:

input - the message to be signed.

messageDecrypt

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

Specified by:

messageDecrypt in interface MessageEncryptor

Parameters:

input - the cipher text of the message

Throws:

InvalidCipherTextException