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The reactive Postgres client

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/*
 * Copyright (C) 2017 Julien Viet
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package io.reactiverse.pgclient.impl.codec.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import static java.nio.charset.StandardCharsets.*;

public class MD5Authentication {

  private final static char[] HEX_ALPHABET = "0123456789abcdef".toCharArray();

  private static String toHex(byte[] bytes) {
    char[] hexChars = new char[bytes.length * 2];
    for ( int j = 0; j < bytes.length; j++ ) {
      int v = bytes[j] & 0xFF;
      hexChars[j * 2] = HEX_ALPHABET[v >>> 4];
      hexChars[j * 2 + 1] = HEX_ALPHABET[v & 0x0F];
    }
    return new String(hexChars);
  }

  public static String encode(String username, String password, byte[] salt) {

    byte[] digest, passDigest;

    MessageDigest messageDigest;

    try {
      messageDigest = MessageDigest.getInstance("MD5");
    }
    catch (NoSuchAlgorithmException e) {
      throw new RuntimeException(e);
    }

    messageDigest.update(password.getBytes(UTF_8));
    messageDigest.update(username.getBytes(UTF_8));
    digest = messageDigest.digest();

    byte[] hexDigest = toHex(digest).getBytes(US_ASCII);

    messageDigest.update(hexDigest);
    messageDigest.update(salt);
    passDigest = messageDigest.digest();

    return "md5" + toHex(passDigest);
  }
}