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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8 with debug enabled.
package org.bouncycastle.crypto.signers;
import java.math.BigInteger;
import java.security.SecureRandom;
/**
* Interface define calculators of K values for DSA/ECDSA.
*/
public interface DSAKCalculator
{
/**
* Return true if this calculator is deterministic, false otherwise.
*
* @return true if deterministic, otherwise false.
*/
boolean isDeterministic();
/**
* Non-deterministic initialiser.
*
* @param n the order of the DSA group.
* @param random a source of randomness.
*/
void init(BigInteger n, SecureRandom random);
/**
* Deterministic initialiser.
*
* @param n the order of the DSA group.
* @param d the DSA private value.
* @param message the message being signed.
*/
void init(BigInteger n, BigInteger d, byte[] message);
/**
* Return the next valid value of K.
*
* @return a K value.
*/
BigInteger nextK();
}
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