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  1. using System;
  2. using System.Security.Cryptography;
  3. using System.Text;
  4.  
  5. class Example
  6. {
  7.     // Hash an input string and return the hash as
  8.     // a 32 character hexadecimal string.
  9.     static string getMd5Hash(string input)
  10.     {
  11.         // Create a new instance of the MD5CryptoServiceProvider object.
  12.         MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
  13.  
  14.         // Convert the input string to a byte array and compute the hash.
  15.         byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));
  16.  
  17.         // Create a new Stringbuilder to collect the bytes
  18.         // and create a string.
  19.         StringBuilder sBuilder = new StringBuilder();
  20.  
  21.         // Loop through each byte of the hashed data 
  22.         // and format each one as a hexadecimal string.
  23.         for (int i = 0; i < data.Length; i++)
  24.         {
  25.             sBuilder.Append(data[i].ToString("x2"));
  26.         }
  27.  
  28.         // Return the hexadecimal string.
  29.         return sBuilder.ToString();
  30.     }
  31.  
  32.     // Verify a hash against a string.
  33.     static bool verifyMd5Hash(string input, string hash)
  34.     {
  35.         // Hash the input.
  36.         string hashOfInput = getMd5Hash(input);
  37.  
  38.         // Create a StringComparer an compare the hashes.
  39.         StringComparer comparer = StringComparer.OrdinalIgnoreCase;
  40.  
  41.         if (0 == comparer.Compare(hashOfInput, hash))
  42.         {
  43.             return true;
  44.         }
  45.         else
  46.         {
  47.             return false;
  48.         }
  49.     }
  50.  
  51.  
  52.     static void Main()
  53.     {
  54.         string source = "Grup 941";
  55.  
  56.         string hash = getMd5Hash(source);
  57.  
  58.         Console.WriteLine("The MD5 hash of " + source + " is: " + hash + ".");
  59.  
  60.         Console.WriteLine("Verifying the hash...");
  61.  
  62.         if (verifyMd5Hash(source, hash))
  63.         {
  64.             Console.WriteLine("The hashes are the same.");
  65.         }
  66.         else
  67.         {
  68.             Console.WriteLine("The hashes are not same.");
  69.         }
  70.  
  71.     }
  72. }
  73. // This code example produces the following output:
  74. //
  75. // The MD5 hash of Hello World! is: ed076287532e86365e841e92bfc50d8c.
  76. // Verifying the hash...
  77. // The hashes are the same.
Success #stdin #stdout 0.01s 131648KB
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stdin
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Standard input is empty
stdout
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The MD5 hash of Grup 941 is: f9dc4dda4acf405ebb0100f326e6cbbd.
Verifying the hash...
The hashes are the same.
https://ideone.com/PhdCBU
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

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