MD5加密算法

    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;

            }

        }

}