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

Class McEliecePointchevalCipher

java.lang.Object

org.bouncycastle.pqc.legacy.crypto.mceliece.McEliecePointchevalCipher

All Implemented Interfaces:

MessageEncryptor

public class McEliecePointchevalCipher
extends 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 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
McEliecePointchevalCipher()

Method Summary

Modifier and Type	Method	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 Details

OID

public static final String OID

The OID of the algorithm.

See Also:

• Constant Field Values

Constructor Details

McEliecePointchevalCipher

public McEliecePointchevalCipher()

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

Return the key size of the given key object.

Parameters:

key - the McElieceCCA2KeyParameters object

Returns:

the key size of the given key object

Throws:

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