org.spongycastle.pqc.crypto.mceliece

Class McEliecePointchevalCipher

java.lang.Object

org.spongycastle.pqc.crypto.mceliece.McEliecePointchevalCipher

All Implemented Interfaces:

MessageEncryptor

public class McEliecePointchevalCipher
extends java.lang.Object
implements MessageEncryptor

This class implements the Pointcheval conversion of the McEliecePKCS. Pointcheval presents a generic technique to make a CCA2-secure cryptosystem from any partially trapdoor one-way function in the random oracle model. 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 java.lang.String	OID The OID of the algorithm.

Constructor Summary

Constructors

Constructor and Description
McEliecePointchevalCipher()

Method Summary

Modifier and Type	Method and Description
protected int	decryptOutputSize(int inLen)
protected int	encryptOutputSize(int inLen)
int	getKeySize(McElieceCCA2KeyParameters key) Return the key size of the given key object.
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 Detail

OID

public static final java.lang.String OID

The OID of the algorithm.

See Also:

Constant Field Values

Constructor Detail

McEliecePointchevalCipher

public McEliecePointchevalCipher()

Method Detail

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 java.lang.IllegalArgumentException

Return the key size of the given key object.

Parameters:

key - the McElieceCCA2KeyParameters object

Returns:

the key size of the given key object

Throws:

java.lang.IllegalArgumentException - if the key is invalid

decryptOutputSize

protected int decryptOutputSize(int inLen)

encryptOutputSize

protected int encryptOutputSize(int inLen)

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