/*
 * Copyright (c) 2015-2019, Virgil Security, Inc.
 *
 * Lead Maintainer: Virgil Security Inc. <support@virgilsecurity.com>
 *
 * 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) Neither the name of virgil nor the names of its
 *     contributors may be used to endorse or promote products derived from
 *     this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS 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 COPYRIGHT HOLDER OR CONTRIBUTORS 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 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.virgilsecurity.sdk.crypto;

import com.virgilsecurity.sdk.crypto.exceptions.CryptoException;

/**
 * The {@link AccessTokenSigner} interface represents an opaque reference to access token signing
 * management objects handled by the agent.
 */
public interface AccessTokenSigner {

  /**
   * Generate token signature with provided {@link PrivateKey}.
   *
   * @param token
   *          the token
   * @param privateKey
   *          the private key
   * @return the byte [ ]
   * @throws CryptoException
   *           if signature generation issue occurred
   */
  byte[] generateTokenSignature(byte[] token, PrivateKey privateKey) throws CryptoException;

  /**
   * Gets algorithm.
   *
   * @return the algorithm
   */
  String getAlgorithm();

  /**
   * Verifies the specified signature using original data and signer's {@link PublicKey}.
   *
   * @param signature
   *          signature bytes for verification
   * @param data
   *          original data bytes for verification
   * @param publicKey
   *          signer's public key for verification
   * @return {@code true} if signature is valid, {@code false} otherwise.
   * @throws CryptoException
   *           if signature verification issue occurred
   */
  boolean verifyTokenSignature(byte[] signature, byte[] data, PublicKey publicKey)
      throws CryptoException;
}
