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// Copyright (c) 2002 Graz University of Technology. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
//    this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. The end-user documentation included with the redistribution, if any, must
//    include the following acknowledgment:
//
//    "This product includes software developed by IAIK of Graz University of
//     Technology."
//
//    Alternately, this acknowledgment may appear in the software itself, if and
//    wherever such third-party acknowledgments normally appear.
//
// 4. The names "Graz University of Technology" and "IAIK of Graz University of
//    Technology" must not be used to endorse or promote products derived from
//    this software without prior written permission.
//
// 5. Products derived from this software may not be called "IAIK PKCS Wrapper",
//    nor may "IAIK" appear in their name, without prior written permission of
//    Graz University of Technology.
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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package iaik.pkcs.pkcs11.parameters;

import iaik.pkcs.pkcs11.Util;
import sun.security.pkcs11.wrapper.CK_ECDH1_DERIVE_PARAMS;

import java.util.Arrays;

/**
 * This abstract class encapsulates parameters for the DH mechanisms
 * Mechanism.ECDH1_DERIVE and Mechanism.ECDH1_COFACTOR_DERIVE.
 *
 * @author Karl Scheibelhofer
 * @version 1.0
 */
public class EcDH1KeyDerivationParameters extends DHKeyDerivationParameters {

  /**
   * The data shared between the two parties.
   */
  protected byte[] sharedData;

  /**
   * Create a new EcDH1KeyDerivationParameters object with the given
   * attributes.
   *
   * @param kdf
   *          The key derivation function used on the shared secret value.
   *          One of the values defined in KeyDerivationFunctionType.
   * @param sharedData
   *          The data shared between the two parties.
   * @param publicData
   *          The other partie's public key value.
   */
  public EcDH1KeyDerivationParameters(long kdf, byte[] sharedData,
      byte[] publicData) {
    super(kdf, publicData);
    this.sharedData = sharedData;
  }

  /**
   * Get this parameters object as an object of the CK_ECDH1_DERIVE_PARAMS
   * class.
   *
   * @return This object as a CK_ECDH1_DERIVE_PARAMS object.
   */
  @Override
  public CK_ECDH1_DERIVE_PARAMS getPKCS11ParamsObject() {
    return new CK_ECDH1_DERIVE_PARAMS(kdf, sharedData, publicData);
  }

  /**
   * Get the data shared between the two parties.
   *
   * @return The data shared between the two parties.
   */
  public byte[] getSharedData() {
    return sharedData;
  }

  /**
   * Set the data shared between the two parties.
   *
   * @param sharedData
   *          The data shared between the two parties.
   */
  public void setSharedData(byte[] sharedData) {
    this.sharedData = sharedData;
  }

  /**
   * Returns the string representation of this object. Do not parse data from
   * this string, it is for debugging only.
   *
   * @return A string representation of this object.
   */
  @Override
  public String toString() {
    return Util.concat(super.toString(),
        "\n  Shared Data: ", Util.toHex(sharedData));
  }

  /**
   * Compares all member variables of this object with the other object.
   * Returns only true, if all are equal in both objects.
   *
   * @param otherObject
   *          The other object to compare to.
   * @return True, if other is an instance of this class and all member
   *         variables of both objects are equal. False, otherwise.
   */
  @Override
  public boolean equals(Object otherObject) {
    if (this == otherObject) {
      return true;
    } else if (!(otherObject instanceof EcDH1KeyDerivationParameters)) {
      return false;
    }

    EcDH1KeyDerivationParameters other =
        (EcDH1KeyDerivationParameters) otherObject;
    return super.equals(other)
        && Arrays.equals(this.sharedData, other.sharedData);
  }

  /**
   * The overriding of this method should ensure that the objects of this
   * class work correctly in a hashtable.
   *
   * @return The hash code of this object.
   */
  @Override
  public int hashCode() {
    return super.hashCode() ^ Util.hashCode(sharedData);
  }

}