MD5加密算法

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public class CryptTool     {         // Hash an input string and return the hash as         // a 32 character hexadecimal string.         public static string getMd5Hash(string input)         {             // Create a new instance of the MD5CryptoServiceProvider object.             MD5 md5Hasher = MD5.Create();               // Convert the input string to a byte array and compute the hash.             byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));               // Create a new Stringbuilder to collect the bytes             // and create a string.             StringBuilder sBuilder = new StringBuilder();               // Loop through each byte of the hashed data             // and format each one as a hexadecimal string.             for (int i = 0; i < data.Length; i++)             {                 sBuilder.Append(data[i].ToString("x2"));             }               // Return the hexadecimal string.             return sBuilder.ToString();         }           // Verify a hash against a string.         public static bool verifyMd5Hash(string input, string hash)         {             // Hash the input.             string hashOfInput = getMd5Hash(input);               // Create a StringComparer an comare the hashes.             StringComparer comparer = StringComparer.OrdinalIgnoreCase;               if (0 == comparer.Compare(hashOfInput, hash))             {                 return true;             }             else             {                 return false;             }         } }