content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * based on code by MyCATCopyrightHolder Copyright (c) 2013, OpenCloudDB/MyCAT.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  package com.actiontech.dble.services.mysqlauthenticate;
  
  import java.security.MessageDigest;
  import java.security.NoSuchAlgorithmException;
  
  /**
   * SecurityUtil
   *
   * @author mycat
   */
  public final class SecurityUtil {
      private SecurityUtil() {
      }
  
      public static byte[] scramble256(byte[] pass, byte[] seed) {
          try {
              int cachingSha2DigestLength = 32;
              MessageDigest md = MessageDigest.getInstance("SHA-256");
              byte[] dig1 = new byte[cachingSha2DigestLength];
              byte[] dig2 = new byte[cachingSha2DigestLength];
              md.update(pass, 0, pass.length);
              md.digest(dig1, 0, cachingSha2DigestLength);
              md.reset();
              md.update(dig1, 0, dig1.length);
              md.digest(dig2, 0, cachingSha2DigestLength);
              md.reset();
  
              md.update(dig2, 0, dig1.length);
              md.update(seed, 0, seed.length);
              byte[] scramble1 = new byte[cachingSha2DigestLength];
              md.digest(scramble1, 0, cachingSha2DigestLength);
  
              byte[] mysqlScrambleBuff = new byte[cachingSha2DigestLength];
              PasswordAuthPlugin.xorString(dig1, mysqlScrambleBuff, scramble1, cachingSha2DigestLength);
  
              return mysqlScrambleBuff;
          } catch (Exception ex) {
              ex.printStackTrace();
          }
          return pass;
      }
  
      public static byte[] scramble411(byte[] pass, byte[] seed) throws NoSuchAlgorithmException {
          MessageDigest md = MessageDigest.getInstance("SHA-1");
          byte[] pass1 = md.digest(pass);
          md.reset();
          byte[] pass2 = md.digest(pass1);
          md.reset();
          md.update(seed);
          byte[] pass3 = md.digest(pass2);
          for (int i = 0; i < pass3.length; i++) {
              pass3[i] = (byte) (pass3[i] ^ pass1[i]);
          }
          return pass3;
      }
  
      public static String scramble323(String pass, String seed) {
          if ((pass == null) || (pass.length() == 0)) {
              return pass;
          }
          byte b;
          double d;
          long[] pw = hash(seed);
          long[] msg = hash(pass);
          long max = 0x3fffffffL;
          long seed1 = (pw[0] ^ msg[0]) % max;
          long seed2 = (pw[1] ^ msg[1]) % max;
          char[] chars = new char[seed.length()];
          for (int i = 0; i < seed.length(); i++) {
              seed1 = ((seed1 * 3) + seed2) % max;
              seed2 = (seed1 + seed2 + 33) % max;
              d = (double) seed1 / (double) max;
              b = (byte) Math.floor((d * 31) + 64);
              chars[i] = (char) b;
          }
          seed1 = ((seed1 * 3) + seed2) % max;
          //seed2 = (seed1 + seed2 + 33) % max;
          d = (double) seed1 / (double) max;
          b = (byte) Math.floor(d * 31);
          for (int i = 0; i < seed.length(); i++) {
              chars[i] ^= (char) b;
          }
          return new String(chars);
      }
  
      private static long[] hash(String src) {
          long nr = 1345345333L;
          long add = 7;
          long nr2 = 0x12345671L;
          long tmp;
          for (int i = 0; i < src.length(); ++i) {
              switch (src.charAt(i)) {
                  case ' ':
                  case '\t':
                      continue;
                  default:
                      tmp = (0xff & src.charAt(i));
                      nr ^= ((((nr & 63) + add) * tmp) + (nr << 8));
                      nr2 += ((nr2 << 8) ^ nr);
                      add += tmp;
              }
          }
          long[] result = new long[2];
          result[0] = nr & 0x7fffffffL;
          result[1] = nr2 & 0x7fffffffL;
          return result;
      }
  
  }
  