javax.crypto.spec

Class DHParameterSpec

  • java.lang.Object
    • javax.crypto.spec.DHParameterSpec
  • All Implemented Interfaces:
    java.security.spec.AlgorithmParameterSpec


    public class DHParameterSpec
    extends java.lang.Object
    implements java.security.spec.AlgorithmParameterSpec
    This class specifies the set of parameters used with the Diffie-Hellman algorithm, as specified in PKCS #3: Diffie-Hellman Key-Agreement Standard.

    A central authority generates parameters and gives them to the two entities seeking to generate a secret key. The parameters are a prime p, a base g, and optionally the length in bits of the private value, l.

    It is possible that more than one instance of parameters may be generated by a given central authority, and that there may be more than one central authority. Indeed, each individual may be its own central authority, with different entities having different parameters.

    Note that this class does not perform any validation on specified parameters. Thus, the specified values are returned directly even if they are null.

    Since:
    1.4
    Version:
    1.15, 01/06/04
    Author:
    Jan Luehe
    See Also:
    KeyAgreement
    • Constructor Summary

      Constructors 
      Constructor and Description
      DHParameterSpec(java.math.BigInteger p, java.math.BigInteger g)
      Constructs a parameter set for Diffie-Hellman, using a prime modulus p and a base generator g.
      DHParameterSpec(java.math.BigInteger p, java.math.BigInteger g, int l)
      Constructs a parameter set for Diffie-Hellman, using a prime modulus p, a base generator g, and the size in bits, l, of the random exponent (private value).
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method and Description
      java.math.BigInteger getG()
      Returns the base generator g.
      int getL()
      Returns the size in bits, l, of the random exponent (private value).
      java.math.BigInteger getP()
      Returns the prime modulus p.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • DHParameterSpec

        public DHParameterSpec(java.math.BigInteger p,
                               java.math.BigInteger g)
        Constructs a parameter set for Diffie-Hellman, using a prime modulus p and a base generator g.
        Parameters:
        p - the prime modulus
        g - the base generator
      • DHParameterSpec

        public DHParameterSpec(java.math.BigInteger p,
                               java.math.BigInteger g,
                               int l)
        Constructs a parameter set for Diffie-Hellman, using a prime modulus p, a base generator g, and the size in bits, l, of the random exponent (private value).
        Parameters:
        p - the prime modulus
        g - the base generator
        l - the size in bits of the random exponent (private value)
    • Method Detail

      • getP

        public java.math.BigInteger getP()
        Returns the prime modulus p.
        Returns:
        the prime modulus p
      • getG

        public java.math.BigInteger getG()
        Returns the base generator g.
        Returns:
        the base generator g
      • getL

        public int getL()
        Returns the size in bits, l, of the random exponent (private value).
        Returns:
        the size in bits, l, of the random exponent (private value), or 0 if this size has not been set

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