Class DHDomainParameterSpec

  • All Implemented Interfaces:
    AlgorithmParameterSpec

    public class DHDomainParameterSpec
    extends DHParameterSpec
    Extension class for DHParameterSpec that wraps a DHDomainParameters object and provides the q domain parameter.
    • Constructor Detail

      • DHDomainParameterSpec

        public DHDomainParameterSpec​(DHParameters domainParameters)
        Base constructor - use the values in an existing set of domain parameters.
        Parameters:
        domainParameters - the Diffie-Hellman domain parameters to wrap.
      • DHDomainParameterSpec

        public DHDomainParameterSpec​(BigInteger p,
                                     BigInteger q,
                                     BigInteger g)
        Minimal constructor for parameters able to be used to verify a public key, or use with MQV.
        Parameters:
        p - the prime p defining the Galois field.
        g - the generator of the multiplicative subgroup of order g.
        q - specifies the prime factor of p - 1
      • DHDomainParameterSpec

        public DHDomainParameterSpec​(BigInteger p,
                                     BigInteger q,
                                     BigInteger g,
                                     int l)
        Minimal constructor for parameters able to be used to verify a public key, or use with MQV, and a private value length.
        Parameters:
        p - the prime p defining the Galois field.
        g - the generator of the multiplicative subgroup of order g.
        q - specifies the prime factor of p - 1
        l - the maximum bit length for the private value.
      • DHDomainParameterSpec

        public DHDomainParameterSpec​(BigInteger p,
                                     BigInteger q,
                                     BigInteger g,
                                     BigInteger j,
                                     int l)
        X9.42 parameters with private value length.
        Parameters:
        p - the prime p defining the Galois field.
        g - the generator of the multiplicative subgroup of order g.
        q - specifies the prime factor of p - 1
        j - optionally specifies the value that satisfies the equation p = jq+1
        l - the maximum bit length for the private value.
      • DHDomainParameterSpec

        public DHDomainParameterSpec​(BigInteger p,
                                     BigInteger q,
                                     BigInteger g,
                                     BigInteger j,
                                     int m,
                                     int l)
        Base constructor - the full domain parameter set.
        Parameters:
        p - the prime p defining the Galois field.
        g - the generator of the multiplicative subgroup of order g.
        q - specifies the prime factor of p - 1
        j - optionally specifies the value that satisfies the equation p = jq+1
        m - the minimum bit length for the private value.
        l - the maximum bit length for the private value.
    • Method Detail

      • getQ

        public BigInteger getQ()
        Return the Q value for the domain parameter set.
        Returns:
        the value Q.
      • getJ

        public BigInteger getJ()
        Return the J value for the domain parameter set if available.
        Returns:
        the value J, null otherwise.
      • getM

        public int getM()
        Return the minimum bitlength for a private value to be generated from these parameters, 0 if not set.
        Returns:
        minimum bitlength for private value.
      • getDomainParameters

        public DHParameters getDomainParameters()
        Return the DHDomainParameters object we represent.
        Returns:
        the internal DHDomainParameters.