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[Encryption and Decryption] Zhengfang Academic System Password Decryption Source Code

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Posted on 5/19/2015 9:54:17 AM | | |
  1. public static string jiemi(string PlainStr, string key)
  2. {
  3.     int num = 1;
  4.     checked
  5.     {
  6.         if (Strings.Len(PlainStr) % 2 == 0)
  7.         {
  8.             string text = Strings.StrReverse(Strings.Left(PlainStr, (int)Math.Round((double)Strings.Len(PlainStr) / 2.0)));
  9.             string text2 = Strings.StrReverse(Strings.Right(PlainStr, (int)Math.Round((double)Strings.Len(PlainStr) / 2.0)));
  10.             PlainStr = text + text2;
  11.         }
  12.         int num2 = Strings.Len(PlainStr);
  13.         string text5="";
  14.         for (int i = 1; i <= num2; i++)
  15.         {
  16.             string text3 = Strings.Mid(PlainStr, i, 1);
  17.             string text4 = Strings.Mid(key, num, 1);
  18.             if ((Strings.Asc(text3) ^ Strings.Asc(text4)) < 32 | (Strings.Asc(text3) ^ Strings.Asc(text4)) > 126 | Strings.Asc(text3) < 0 | Strings.Asc(text3) > 255)
  19.             {
  20.                 text5 += text3;
  21.             }
  22.             else
  23.             {
  24.         text5 += Strings.Chr(Strings.Asc(text3) ^ Strings.Asc(text4)).ToString();
  25.             }
  26.             if (num == Strings.Len(key))
  27.             {
  28.                 num = 0;
  29.             }
  30.             num++;
  31.         }
  32.         return text5;
  33.     }
  34. }
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