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  1. using System;
  2. using System.Text;
  3. using System.Linq;
  4.  
  5. namespace Program {
  6.     class Gaderypoluki {
  7.         public class KeyIncorrectException : Exception {
  8.             public string IncorrectionCause { get; private set; } 
  9.             public KeyIncorrectException(string cause) {
  10.                 this.IncorrectionCause = cause;
  11.             }
  12.         }
  13.  
  14.         public static string Encrypt(string plain, string key) {
  15.             if (key.Length % 2 == 0) {
  16.                 if (key.Length == key.Distinct().Count()) {
  17.                     var encrypted = new StringBuilder(plain);
  18.                     for (int i = 0; i < plain.Length; ++i)
  19.                         for (int j = 1; j < key.Length; j += 2)
  20.                             if (key[j] == plain[i]) encrypted[i] = key[j - 1];
  21.                             else if (key[j - 1] == plain[i]) encrypted[i] = key[j];
  22.                     return encrypted.ToString();
  23.                 }
  24.                 else throw new KeyIncorrectException("Characters in key must be unique!");
  25.             }
  26.             else throw new KeyIncorrectException("Incorrect key length! Key length must be even.");
  27.         }
  28.  
  29.         public static string Decrypt(string encrypted, string key) {
  30.             return Encrypt(encrypted, key);
  31.         }
  32.     }
  33.  
  34.     class Program {
  35.         public static void Main(string[] args) {
  36.             try {
  37.                 var plain = "Hello World";
  38.                 var key = "gaderypoluki";
  39.                 var encrypted = Gaderypoluki.Encrypt(plain, key);
  40.                 var decrypted = Gaderypoluki.Decrypt(encrypted, key);
  41.                 Console.WriteLine(encrypted);
  42.                 Console.WriteLine(decrypted);
  43.             }
  44.             catch(Gaderypoluki.KeyIncorrectException ex) {
  45.                 Console.WriteLine(ex.IncorrectionCause);
  46.             }
  47.         }
  48.     }
  49. }
  50.  
Success #stdin #stdout 0.05s 24120KB
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Standard input is empty
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Hduup Wpyue
Hello World
https://ideone.com/08fmql
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
public

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