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package javax.crypto.spec;

import java.math.BigInteger;
import java.security.spec.KeySpec;

/**
 * This class specifies a Diffie-Hellman public key with 
 * its associated parameters. 
 *
 * @see java.security.Key
 * @see java.security.KeyFactory
 * @see java.security.spec.KeySpec
 * @see java.security.spec.KeySpec
 * @see java.security.spec.X509EncodedKeySpec
 * @see javax.crypto.spec.DHPrivateKeySpec
 *
 * @version 0.1, 97/11/26
 * @author Ming Yung
 */
public class DHPublicKeySpec implements KeySpec
{
  private BigInteger p, g, y;
  private int l;

  public DHPublicKeySpec(BigInteger y, BigInteger p, BigInteger g)
  {
    this.y = y;
    this.p = p;
    this.g = g;
  }

  public DHPublicKeySpec(BigInteger y, BigInteger p, BigInteger g, int l)
  {
    this.y = y;
    this.p = p;
    this.g = g;
    this.l = l;
  }

  /**
   * Returns the public value y.
   *
   * @return the public value y.
   */
  public BigInteger getY()
  {
    return this.y;
  }

  /**
   * Returns the prime modulus p.
   *
   * @return the prime modulus p.
   */
  public BigInteger getP()
  {
    return this.p;
  }

  /**
   * Returns the base generator g.
   *
   * @return the base generator g.
   */
  public BigInteger getG()
  {
    return this.g;
  }

  /**
   * Returns the private-value length l.
   *
   * @return the private-value length l, or null if l has not been set
   */
  public int getL()
  {
    return this.l;
  }
}


