Bouncy Castle Cryptography Library 1.64

org.bouncycastle.crypto.signers
Class HMacDSAKCalculator

java.lang.Object
  |
  +--org.bouncycastle.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
HMacDSAKCalculator(Digest digest)
          Base constructor.
 
Method Summary
 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
Following copied from interface: org.bouncycastle.crypto.signers.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
Following copied from interface: org.bouncycastle.crypto.signers.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
Following copied from interface: org.bouncycastle.crypto.signers.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
Following copied from interface: org.bouncycastle.crypto.signers.DSAKCalculator
Returns:
a K value.

Bouncy Castle Cryptography Library 1.64