Class DHParameterSpec

java.lang.Object
javax.crypto.spec.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:

  • Constructor Summary

    Constructors
    Constructor
    Description
    DHParameterSpec(BigInteger p, BigInteger g)
    Constructs a parameter set for Diffie-Hellman, using a prime modulus p and a base generator g.
    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).

  • Method Summary

    Modifier and Type
    Method
    Description
    BigInteger
    getG()
    Returns the base generator g.
    int
    getL()
    Returns the size in bits, l, of the random exponent (private value).
    BigInteger
    getP()
    Returns the prime modulus p.

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Creates and returns a copy of this object.
    boolean
    equals(Object obj)
    Indicates whether some other object is "equal to" this one.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    Finalization is deprecated and subject to removal in a future release.
    final Class<?>
    getClass()
    Returns the runtime class of this Object.
    int
    hashCode()
    Returns a hash code value for this object.
    final void
    notify()
    Wakes up a single thread that is waiting on this object's monitor.
    final void
    notifyAll()
    Wakes up all threads that are waiting on this object's monitor.
    String
    toString()
    Returns a string representation of the object.
    final void
    wait()
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
    final void
    wait(long timeoutMillis)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
    final void
    wait(long timeoutMillis, int nanos)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

  • Constructor Details

    • 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 Details

    • 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