gnu.crypto.sig.rsa

Class EMSA_PKCS1_V1_5

Implemented Interfaces:
Cloneable

public class EMSA_PKCS1_V1_5
extends java.lang.Object
implements Cloneable

An implementation of the EMSA-PKCS1-V1.5 encoding scheme.

EMSA-PKCS1-V1.5 is parameterised by the choice of hash function Hash and hLen which denotes the length in octets of the hash function output.

References:

  1. Public-Key Cryptography Standards (PKCS) #1:
    RSA Cryptography Specifications Version 2.1.
    Jakob Jonsson and Burt Kaliski.

Version:
$Revision: 1.3 $

Method Summary

Object
clone()
byte[]
encode(byte[] mHash, int emLen)
Frames the hash of a message, along with an ID of the hash function in a DER sequence according to the specifications of EMSA-PKCS1-V1.5 as described in RFC-3447 (see class documentation).
static EMSA_PKCS1_V1_5
getInstance(String mdName)
Returns an instance of this object given a designated name of a hash function.

Method Details

clone

public Object clone()


encode

public byte[] encode(byte[] mHash,
                     int emLen)
Frames the hash of a message, along with an ID of the hash function in a DER sequence according to the specifications of EMSA-PKCS1-V1.5 as described in RFC-3447 (see class documentation).

Parameters:
mHash - the byte sequence resulting from applying the message digest algorithm Hash to the message M.
emLen - intended length in octets of the encoded message, at least tLen + 11, where tLen is the octet length of the DER encoding T of a certain value computed during the encoding operation.

Returns:
encoded message, an octet string of length emLen.


getInstance

public static final EMSA_PKCS1_V1_5 getInstance(String mdName)
Returns an instance of this object given a designated name of a hash function.

Parameters:
mdName - the canonical name of a hash function.

Returns:
an instance of this object configured for use with the designated options.


Copyright © 2001, 2002, 2003 Free Software Foundation, Inc. All Rights Reserved.