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PKCS#11 wrapper based on sunpkcs11
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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.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
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// 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
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package iaik.pkcs.pkcs11.parameters;

import iaik.pkcs.pkcs11.wrapper.Constants;
import iaik.pkcs.pkcs11.wrapper.Functions;
import sun.security.pkcs11.wrapper.CK_X9_42_DH1_DERIVE_PARAMS;

/**
 * This abstract class encapsulates parameters for the X9.42 DH mechanism
 * Mechanism.X9_42_DH_DERIVE.
 *
 * @author Karl Scheibelhofer
 * @version 1.0
 * @invariants
 */
@SuppressWarnings("restriction")
public class X942DH1KeyDerivationParameters extends DHKeyDerivationParameters {

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

    /**
     * Create a new X942DH1KeyDerivationParameters object with the given
     * attributes.
     *
     * @param keyDerivationFunction
     *          The key derivation function used on the shared secret value.
     *          One of the values defined in KeyDerivationFunctionType.
     * @param otherInfo
     *          The data shared between the two parties.
     * @param publicData
     *          The other partie's public key value.
     * @preconditions ((keyDerivationFunction == KeyDerivationFunctionType.NULL)
     *                 or (keyDerivationFunction
     *                      == KeyDerivationFunctionType.SHA1_KDF)
     *                 or (keyDerivationFunction
     *                      == KeyDerivationFunctionType.SHA1_KDF_ASN1)
     *                 or (keyDerivationFunction
     *                      == KeyDerivationFunctionType.SHA1_KDF_CONCATENATE))
     *                and (publicData <> null)
     * @postconditions
     */
    public X942DH1KeyDerivationParameters(long keyDerivationFunction,
            byte[] otherInfo,
            byte[] publicData) {
        super(keyDerivationFunction, publicData);
        otherInfo_ = otherInfo;
    }

    /**
     * Create a (deep) clone of this object.
     *
     * @return A clone of this object.
     * @preconditions
     * @postconditions (result <> null)
     *                 and (result instanceof X942DH1KeyDerivationParameters)
     *                 and (result.equals(this))
     */
    @Override
    public java.lang.Object clone() {
        X942DH1KeyDerivationParameters clone
                = (X942DH1KeyDerivationParameters) super.clone();

        clone.otherInfo_ = (byte[]) this.otherInfo_.clone();
        return clone;
    }

    /**
     * Get this parameters object as an object of the CK_X9_42_DH1_DERIVE_PARAMS
     * class.
     *
     * @return This object as a CK_X9_42_DH1_DERIVE_PARAMS object.
     * @preconditions
     * @postconditions (result <> null)
     */
    @Override
    public Object getPKCS11ParamsObject() {
        CK_X9_42_DH1_DERIVE_PARAMS params = new CK_X9_42_DH1_DERIVE_PARAMS();

        params.kdf = keyDerivationFunction_;
        params.pOtherInfo = otherInfo_;
        params.pPublicData = publicData_;

        return params;
    }

    /**
     * Get the data shared between the two parties.
     *
     * @return The data shared between the two parties.
     * @preconditions
     * @postconditions
     */
    public byte[] getOtherInfo() {
        return otherInfo_;
    }

    /**
     * Set the data shared between the two parties.
     *
     * @param otherInfo
     *          The data shared between the two parties.
     * @preconditions (otherInfo <> null)
     * @postconditions
     */
    public void setOtherInfo(byte[] otherInfo) {
        otherInfo_ = otherInfo;
    }

    /**
     * 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() {
        StringBuilder buffer = new StringBuilder();

        buffer.append(super.toString());

        buffer.append(Constants.NEWLINE_INDENT);
        buffer.append("Other Info: ");
        buffer.append(Functions.toHexString(otherInfo_));

        return buffer.toString();
    }

    /**
     * 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.
     * @preconditions
     * @postconditions
     */
    @Override
    public boolean equals(java.lang.Object otherObject) {
        if (this == otherObject) {
            return true;
        }

        if (!(otherObject instanceof X942DH1KeyDerivationParameters)) {
            return false;
        }

        X942DH1KeyDerivationParameters other
                = (X942DH1KeyDerivationParameters) otherObject;
        return super.equals(other)
                && Functions.equals(this.otherInfo_, other.otherInfo_);
    }

    /**
     * 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.
     * @preconditions
     * @postconditions
     */
    @Override
    public int hashCode() {
        return super.hashCode() ^ Functions.hashCode(otherInfo_);
    }

}