org.spongycastle.crypto.signers

Class HMacDSAKCalculator

java.lang.Object

org.spongycastle.crypto.signers.HMacDSAKCalculator

All Implemented Interfaces:

DSAKCalculator

public class HMacDSAKCalculator
extends java.lang.Object
implements DSAKCalculator

A deterministic K calculator based on the algorithm in section 3.2 of RFC 6979.

Constructor Summary

Constructors

Constructor and Description
HMacDSAKCalculator(Digest digest) Base constructor.

Method Summary

Modifier and Type	Method and Description
void	init(java.math.BigInteger n, java.math.BigInteger d, byte[] message) Deterministic initialiser.
void	init(java.math.BigInteger n, java.security.SecureRandom random) Non-deterministic initialiser.
boolean	isDeterministic() Return true if this calculator is deterministic, false otherwise.
java.math.BigInteger	nextK() Return the next valid value of K.

Methods inherited from class java.lang.Object

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

Constructor Detail

HMacDSAKCalculator

public HMacDSAKCalculator(Digest digest)

Base constructor.

Parameters:

digest - digest to build the HMAC on.

Method Detail

isDeterministic

public boolean isDeterministic()

Description copied from interface: DSAKCalculator

Return true if this calculator is deterministic, false otherwise.

Specified by:

isDeterministic in interface DSAKCalculator

Returns:

true if deterministic, otherwise false.

init

public void init(java.math.BigInteger n,
                 java.security.SecureRandom random)

Description copied from interface: DSAKCalculator

Non-deterministic initialiser.

Specified by:

init in interface DSAKCalculator

Parameters:

n - the order of the DSA group.

random - a source of randomness.

init

public void init(java.math.BigInteger n,
                 java.math.BigInteger d,
                 byte[] message)

Description copied from interface: DSAKCalculator

Deterministic initialiser.

Specified by:

init in interface DSAKCalculator

Parameters:

n - the order of the DSA group.

d - the DSA private value.

message - the message being signed.

nextK

public java.math.BigInteger nextK()

Description copied from interface: DSAKCalculator

Return the next valid value of K.

Specified by:

nextK in interface DSAKCalculator

Returns:

a K value.