Package net.i2p.crypto.elgamal

Class ElGamalSigEngine

java.lang.Object

java.security.SignatureSpi

java.security.Signature

net.i2p.crypto.elgamal.ElGamalSigEngine

public final class ElGamalSigEngine
extends Signature

ElG signatures with SHA-256 ref: https://en.wikipedia.org/wiki/ElGamal_signature_scheme

Since:

0.9.25

Field Summary

Fields inherited from class java.security.Signature

SIGN, state, UNINITIALIZED, VERIFY

Fields inherited from class java.security.SignatureSpi

appRandom

Constructor Summary

Constructors

Constructor	Description
ElGamalSigEngine()	No specific hash requested, allows any ElGamal key.
ElGamalSigEngine(MessageDigest digest)	Specific hash requested, only matching keys will be allowed.

Method Summary

Modifier and Type	Method	Description
protected Object	engineGetParameter(String param)	Deprecated.
protected void	engineInitSign(PrivateKey privateKey)
protected void	engineInitVerify(PublicKey publicKey)
protected void	engineSetParameter(String param, Object value)	Deprecated. replaced with this
protected byte[]	engineSign()
protected void	engineUpdate(byte b)
protected void	engineUpdate(byte[] b, int off, int len)
protected boolean	engineVerify(byte[] sigBytes)

Methods inherited from class java.security.Signature

clone, getAlgorithm, getInstance, getInstance, getInstance, getParameter, getParameters, getProvider, initSign, initSign, initVerify, initVerify, setParameter, setParameter, sign, sign, toString, update, update, update, update, verify, verify

Methods inherited from class java.security.SignatureSpi

engineGetParameters, engineInitSign, engineSetParameter, engineSign, engineUpdate, engineVerify

Methods inherited from class java.lang.Object

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

Constructor Details

ElGamalSigEngine

public ElGamalSigEngine()

No specific hash requested, allows any ElGamal key.

ElGamalSigEngine

public ElGamalSigEngine(MessageDigest digest)

Specific hash requested, only matching keys will be allowed.

Parameters:

digest - the hash algorithm that keys must have to sign or verify.

Method Details

engineInitSign

protected void engineInitSign(PrivateKey privateKey)
                       throws InvalidKeyException

Specified by:

engineInitSign in class SignatureSpi

Throws:

InvalidKeyException

engineInitVerify

protected void engineInitVerify(PublicKey publicKey)
                         throws InvalidKeyException

Specified by:

engineInitVerify in class SignatureSpi

Throws:

InvalidKeyException

engineUpdate

protected void engineUpdate(byte b)
                     throws SignatureException

Specified by:

engineUpdate in class SignatureSpi

Throws:

SignatureException

engineUpdate

protected void engineUpdate(byte[] b,
 int off,
 int len)
                     throws SignatureException

Specified by:

engineUpdate in class SignatureSpi

Throws:

SignatureException

engineSign

protected byte[] engineSign()
                     throws SignatureException

Specified by:

engineSign in class SignatureSpi

Returns:

ASN.1 R,S

Throws:

SignatureException

engineVerify

protected boolean engineVerify(byte[] sigBytes)
                        throws SignatureException

Specified by:

engineVerify in class SignatureSpi

Parameters:

sigBytes - ASN.1 R,S

Throws:

SignatureException

engineSetParameter

@Deprecated
protected void engineSetParameter(String param,
 Object value)

Deprecated.

replaced with this

Specified by:

engineSetParameter in class SignatureSpi

engineGetParameter

@Deprecated
protected Object engineGetParameter(String param)

Deprecated.

Specified by:

engineGetParameter in class SignatureSpi