gnu.crypto.sig.rsa

Class RSAPSSSignature

java.lang.Object

gnu.crypto.sig.BaseSignature

gnu.crypto.sig.rsa.RSAPSSSignature

All Implemented Interfaces:

ISignature, java.lang.Cloneable

public class RSAPSSSignature
extends BaseSignature

The RSA-PSS signature scheme is a public-key encryption scheme combining the RSA algorithm with the Probabilistic Signature Scheme (PSS) encoding method.

The inventors of RSA are Ronald L. Rivest, Adi Shamir, and Leonard Adleman, while the inventors of the PSS encoding method are Mihir Bellare and Phillip Rogaway. During efforts to adopt RSA-PSS into the P1363a standards effort, certain adaptations to the original version of RSA-PSS were made by Mihir Bellare and Phillip Rogaway and also by Burt Kaliski (the editor of IEEE P1363a) to facilitate implementation and integration into existing protocols.

References:

1. RSA-PSS Signature Scheme with Appendix, part B.
   Primitive specification and supporting documentation.
   Jakob Jonsson and Burt Kaliski.

Version:

$Revision: 1.1 $

Field Summary

Fields inherited from class gnu.crypto.sig.BaseSignature

md, privateKey, publicKey, schemeName

Fields inherited from interface gnu.crypto.sig.ISignature

SIGNER_KEY, SOURCE_OF_RANDOMNESS, VERIFIER_KEY

Constructor Summary

Constructors

Constructor and Description
RSAPSSSignature() Default 0-arguments constructor.
RSAPSSSignature(java.lang.String mdName) Constructs an instance of this object using the designated message digest algorithm as its underlying hash function, and having 0-octet salt.
RSAPSSSignature(java.lang.String mdName, int sLen) Constructs an instance of this object using the designated message digest algorithm as its underlying hash function.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	clone() Returns a clone copy of this instance.
protected java.lang.Object	generateSignature()
protected void	setupForSigning(java.security.PrivateKey k)
protected void	setupForVerification(java.security.PublicKey k)
protected boolean	verifySignature(java.lang.Object sig)

Methods inherited from class gnu.crypto.sig.BaseSignature

clearData, clearData, init, name, nextRandomBytes, setupSign, setupVerify, sign, update, update, verify

Methods inherited from class java.lang.Object

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

Constructor Detail

RSAPSSSignature

public RSAPSSSignature()

Default 0-arguments constructor. Uses SHA-1 as the default hash and a 0-octet salt.

RSAPSSSignature

public RSAPSSSignature(java.lang.String mdName)

Constructs an instance of this object using the designated message digest algorithm as its underlying hash function, and having 0-octet salt.

Parameters:

mdName - the canonical name of the underlying hash function.

RSAPSSSignature

public RSAPSSSignature(java.lang.String mdName,
                       int sLen)

Constructs an instance of this object using the designated message digest algorithm as its underlying hash function.

Parameters:

mdName - the canonical name of the underlying hash function.

sLen - the desired length in octets of the salt to use for encoding / decoding signatures.

Method Detail

clone

public java.lang.Object clone()

Description copied from interface: ISignature

Returns a clone copy of this instance.

Specified by:

clone in interface ISignature

Specified by:

clone in class BaseSignature

Returns:

a clone copy of this instance.

setupForVerification

protected void setupForVerification(java.security.PublicKey k)
                             throws java.lang.IllegalArgumentException

Specified by:

setupForVerification in class BaseSignature

Throws:

java.lang.IllegalArgumentException

setupForSigning

protected void setupForSigning(java.security.PrivateKey k)
                        throws java.lang.IllegalArgumentException

Specified by:

setupForSigning in class BaseSignature

Throws:

java.lang.IllegalArgumentException

generateSignature

protected java.lang.Object generateSignature()
                                      throws java.lang.IllegalStateException

Specified by:

generateSignature in class BaseSignature

Throws:

java.lang.IllegalStateException

verifySignature

protected boolean verifySignature(java.lang.Object sig)
                           throws java.lang.IllegalStateException

Specified by:

verifySignature in class BaseSignature

Throws:

java.lang.IllegalStateException