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创建Solted hash

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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5. using System.Security.Cryptography;
  6.  
  7. namespace Loader
  8. {
  9.  
  10.         public sealed class SaltedHash
  11.         {
  12.             public string Salt { get { return _salt; } }
  13.             public string Hash { get { return _hash; } }
  14.  
  15.             public static SaltedHash Create(string password)
  16.             {
  17.                 string salt = _createSalt();
  18.                 string hash = _calculateHash(salt, password);
  19.                 return new SaltedHash(salt, hash);
  20.             }
  21.  
  22.             public static SaltedHash Create(string salt, string hash)
  23.             {
  24.                 return new SaltedHash(salt, hash);
  25.             }
  26.  
  27.             public bool Verify(string password)
  28.             {
  29.                 string h = _calculateHash(_salt, password);
  30.                 return _hash.Equals(h);
  31.             }
  32.  
  33.             private SaltedHash(string s, string h)
  34.             {
  35.                 _salt = s;
  36.                 _hash = h;
  37.             }
  38.  
  39.             private static string _createSalt()
  40.             {
  41.                 byte[] r = _createRandomBytes(saltLength);
  42.                 return Convert.ToBase64String(r);
  43.             }
  44.  
  45.             private static byte[] _createRandomBytes(int len)
  46.             {
  47.                 byte[] r = new byte[len];
  48.                 new RNGCryptoServiceProvider().GetBytes(r);
  49.                 return r;
  50.             }
  51.  
  52.             private static string _calculateHash(string salt, string password)
  53.             {
  54.                 byte[] data = _toByteArray(salt + password);
  55.                 byte[] hash = _calculateHash(data);
  56.                 return Convert.ToBase64String(hash);
  57.             }
  58.  
  59.             private static byte[] _calculateHash(byte[] data)
  60.             {
  61.                 return new SHA1CryptoServiceProvider().ComputeHash(data);
  62.             }
  63.  
  64.             private static byte[] _toByteArray(string s)
  65.             {
  66.                 return System.Text.Encoding.UTF8.GetBytes(s);
  67.             }
  68.  
  69.             private readonly string _salt;
  70.             private readonly string _hash;
  71.             private const int saltLength = 12;
  72.         }
  73.  
  74.     }

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