DSAKCalculator (Bouncy Castle Library 1.85 API Specification)
Date: 2026-07-12

org.bouncycastle.crypto.signers

## Interface DSAKCalculator

- All Known Implementing Classes:
    HMacDSAKCalculator, RandomDSAKCalculator

      public interface DSAKCalculator

  Interface define calculators of K values for DSA/ECDSA.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    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.

- - ### Method Detail

    - #### isDeterministic

          boolean isDeterministic()

      Return true if this calculator is deterministic, false otherwise.
      Returns:
        true if deterministic, otherwise false.

    - #### init

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

      Non-deterministic initialiser.
      Parameters:
        `n` - the order of the DSA group.
        `random` - a source of randomness.

    - #### init

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

      Deterministic initialiser.
      Parameters:
        `n` - the order of the DSA group.
        `d` - the DSA private value.
        `message` - the message being signed.

    - #### nextK

          java.math.BigInteger nextK()

      Return the next valid value of K.
      Returns:
        a K value.