core/src/main/java/org/bouncycastle/crypto/signers/DSAKCalculator.java


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41

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();
}