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Smart-ID Java client is a Java library that can be used for easy integration of the Smart-ID solution to information systems or e-services

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package ee.sk.smartid;

/*-
 * #%L
 * Smart ID sample Java client
 * %%
 * Copyright (C) 2018 SK ID Solutions AS
 * %%
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * #L%
 */

import java.security.SecureRandom;

/**
 * Class containing the hash and its hash type used for authentication
 */
public class AuthenticationHash extends SignableHash {

  /**
   * creates {@link AuthenticationHash} instance
   * containing a randomly generated hash
   * of the chosen hash type
   *
   * @param hashType hash type of the randomly generated hash
   * @return authentication hash
   */
  public static AuthenticationHash generateRandomHash(HashType hashType) {
    AuthenticationHash authenticationHash = new AuthenticationHash();
    byte[] generatedDigest = DigestCalculator.calculateDigest(getRandomBytes(), hashType);
    authenticationHash.setHash(generatedDigest);
    authenticationHash.setHashType(hashType);
    return authenticationHash;
  }

  /**
   * creates {@link AuthenticationHash} instance
   * containing a randomly generated SHA-512 hash
   *
   * @return authentication hash
   */
  public static AuthenticationHash generateRandomHash() {
    return generateRandomHash(HashType.SHA512);
  }

  private static byte[] getRandomBytes() {
    byte[] randBytes = new byte[64];
    new SecureRandom().nextBytes(randBytes);
    return randBytes;
  }

}