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  1. private static string GenerateSaltValue()
  2. {
  3.     UnicodeEncoding utf16 = new UnicodeEncoding();
  4.  
  5.     if (utf16 != null)
  6.     {
  7.         // Create a random number object seeded from the value
  8.         // of the last random seed value. This is done
  9.         // interlocked because it is a static value and we want
  10.         // it to roll forward safely.
  11.  
  12.         Random random = new Random(unchecked((int)DateTime.Now.Ticks));
  13.  
  14.         if (random != null)
  15.         {
  16.             // Create an array of random values.
  17.  
  18.             byte[] saltValue = new byte[SaltValueSize];
  19.  
  20.             random.NextBytes(saltValue);
  21.  
  22.             // Convert the salt value to a string. Note that the resulting string
  23.             // will still be an array of binary values and not a printable string. 
  24.             // Also it does not convert each byte to a double byte.
  25.  
  26.             string saltValueString = utf16.GetString(saltValue);
  27.  
  28.             // Return the salt value as a string.
  29.  
  30.             return saltValueString;
  31.         }
  32.     }
  33.  
  34.     return null;
  35. }
  36.  
  37. private static string HashPassword(string clearData, string saltValue, HashAlgorithm hash)
  38. {
  39.     UnicodeEncoding encoding = new UnicodeEncoding();
  40.  
  41.     if (clearData != null && hash != null && encoding != null)
  42.     {
  43.         // If the salt string is null or the length is invalid then
  44.         // create a new valid salt value.
  45.  
  46.         if (saltValue == null)
  47.         {
  48.             // Generate a salt string.
  49.             saltValue = GenerateSaltValue();
  50.         }
  51.  
  52.         // Convert the salt string and the password string to a single
  53.         // array of bytes. Note that the password string is Unicode and
  54.         // therefore may or may not have a zero in every other byte.
  55.  
  56.         byte[] binarySaltValue = new byte[SaltValueSize];
  57.  
  58.         binarySaltValue[0] = byte.Parse(saltValue.Substring(0, 2), System.Globalization.NumberStyles.HexNumber, CultureInfo.InvariantCulture.NumberFormat);
  59.         binarySaltValue[1] = byte.Parse(saltValue.Substring(2, 2), System.Globalization.NumberStyles.HexNumber, CultureInfo.InvariantCulture.NumberFormat);
  60.         binarySaltValue[2] = byte.Parse(saltValue.Substring(4, 2), System.Globalization.NumberStyles.HexNumber, CultureInfo.InvariantCulture.NumberFormat);
  61.         binarySaltValue[3] = byte.Parse(saltValue.Substring(6, 2), System.Globalization.NumberStyles.HexNumber, CultureInfo.InvariantCulture.NumberFormat);
  62.  
  63.         byte[] valueToHash = new byte[SaltValueSize + encoding.GetByteCount(clearData)];
  64.         byte[] binaryPassword = encoding.GetBytes(clearData);
  65.  
  66.         // Copy the salt value and the password to the hash buffer.
  67.  
  68.         binarySaltValue.CopyTo(valueToHash, 0);
  69.         binaryPassword.CopyTo(valueToHash, SaltValueSize);
  70.  
  71.         byte[] hashValue = hash.ComputeHash(valueToHash);
  72.  
  73.         // The hashed password is the salt plus the hash value (as a string).
  74.  
  75.         string hashedPassword = saltValue;
  76.  
  77.         foreach (byte hexdigit in hashValue)
  78.         {
  79.             hashedPassword += hexdigit.ToString("X2", CultureInfo.InvariantCulture.NumberFormat);
  80.         }
  81.  
  82.         // Return the hashed password as a string.
  83.  
  84.         return hashedPassword;
  85.     }
  86.  
  87.     return null;
  88. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cs(1,23): error CS0116: A namespace can only contain types and namespace declarations
prog.cs(37,23): error CS0116: A namespace can only contain types and namespace declarations
Compilation failed: 2 error(s), 0 warnings
stdout
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Standard output is empty
https://ideone.com/42y61
language:
C# (gmcs 5.20.1)
created:
14 years ago
visibility:
public

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