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Java Standard Edition (SE)

DHParameterSpec


javax.crypto.spec

Class DHParameterSpec

  • All Implemented Interfaces:
    AlgorithmParameterSpec


    public class DHParameterSpec
    extends Object
    implements 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
    See Also:
    KeyAgreement
    • Constructor Detail

      • DHParameterSpec

        public DHParameterSpec(BigInteger p,
                               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(BigInteger p,
                               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 BigInteger getP()
        Returns the prime modulus p.
        Returns:
        the prime modulus p
      • getG

        public 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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