C# Reflection MD5/SHA1 Hash

ReflectionHash.cs

//
// Description: C# Reflection MD5/SHA1 Hash
// Author: wangye  <pcn88 at hotmail dot com>
// Website: http://wangye.org
// For more information please visit:
//   http://wangye.org/blog/archives/134/
//
using System;
using System.Text;
using System.Security.Cryptography;
using System.Reflection;
 
namespace ConsoleApplication1
{
    class Program
    {
        public static string ComputeHash(
            string str,       // 要哈希的字符串
            string hashType,  // 哈希的类型SHA1、MD5
            string encodeType // 编码模式ASCII、UTF8、
                              // 如果为null将采用Default编码
            )
        {
 
            encodeType = string.IsNullOrEmpty(encodeType) ?
                "Default" : encodeType.Trim();
 
            string []assemblyName = new string[2] {
                "System.Security.Cryptography." +
                hashType.Trim().ToUpper() +
                "CryptoServiceProvider",
                "System.Text.Encoding"};
 
            using (HashAlgorithm
                Csp = Assembly.GetAssembly(
                System.Type.GetType(assemblyName[0]))
                .CreateInstance(assemblyName[0]) as HashAlgorithm)
            {
 
                str = Convert.ToBase64String(
                    Csp.ComputeHash(
                    (System.Type.GetType(assemblyName[1])
                    .GetProperty(encodeType)
                    .GetValue(null, null) as Encoding)
                    .GetBytes(str))
                    );
                Csp.Clear();
            }
            return str;
        }
 
        static void Main(string[] args)
        {
            System.Console.WriteLine(
                ComputeHash(@"http://wangye.org", "SHA1", "UTF8")
                );
            System.Console.WriteLine(
                ComputeHash(@"http://wangye.org", "MD5", "UTF8")
                );
        }
    }
}