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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
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE LICENSOR BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
// OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

package iaik.pkcs.pkcs11.parameters;

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

import java.util.Arrays;

/**
 * This class represents the necessary parameters required by
 * the CKM_AES_CTR mechanism as defined in CK_AES_CTR_PARAMS structure.
 *
 * PKCS#11 structure:
 * 
 * typedef struct CK_AES_CTR_PARAMS {
 *   CK_ULONG ulCounterBits;
 *   CK_BYTE cb[16];
 * } CK_AES_CTR_PARAMS;
 * 
 *
 */
public class AesCtrParameters implements Parameters {

  private byte[] cb;

  public AesCtrParameters(byte[] cb) {
    Util.requireNonNull("cb", cb);
    if (cb.length != 16) {
      throw new IllegalArgumentException("cb.length must be 16");
    }
    this.cb = cb;
  }

  public byte[] getCb() {
    return cb;
  }

  public void setCb(byte[] cb) {
    Util.requireNonNull("cb", cb);
    if (cb.length != 16) {
      throw new IllegalArgumentException("cb.length must be 16");
    }
    this.cb = cb;
  }

  /**
   * 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("  cb: ", Util.toHex(cb));
  }

  /**
   * 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 AesCtrParameters)) {
      return false;
    }

    AesCtrParameters other = (AesCtrParameters) otherObject;
    return Arrays.equals(this.cb, other.cb);
  }

  /**
   * 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 Util.hashCode(cb);
  }

  @Override
  public CK_AES_CTR_PARAMS getPKCS11ParamsObject() {
    return new CK_AES_CTR_PARAMS(cb);
  }

}