C#加密帮助类EncryptHelper

using System;  
using System.Collections.Generic;  
using System.IO;  
using System.Linq;  
using System.Runtime.Serialization.Formatters.Binary;  
using System.Security.Cryptography;  
using System.Text;  
using log4net;  
   
namespace Utility  
{  
    /// <summary>  
    /// @Author:梁继龙  
    /// @Date:2012/7/30  
    /// @Descripte:EncryptHelper加密帮助类.  
    /// </summary>  
    public class EncryptHelper  
    {  
        /// <summary>  
        ///方法一:  
        ///此种加密之后的字符串是三十二位的(字母加数据)字符串    
        /// Example: password是admin 加密变成后21232f297a57a5a743894a0e4a801fc3  
        /// </summary>  
        /// <param name="beforeStr"></param>  
        /// <returns></returns>  
        public string MD5Encrypt(string beforeStr)  
        {  
            string afterString = "";  
            try  
            {  
                MD5 md5 = MD5.Create();  
                byte[] hashs = md5.ComputeHash(Encoding.UTF8.GetBytes(beforeStr));  
   
                foreach (byte by in hashs)  
                    //这里是字母加上数据进行加密.//3y 可以,y3不可以或 x3j等应该是超过32位不可以  
                    afterString += by.ToString("x2");  
            }  
            catch (Exception ex)  
            {  
                ILog log = log4net.LogManager.GetLogger(this.GetType());  
                log.Error("==============你引起了一个错误是==============" + ex.Message.ToString());  
            }  
            return afterString;  
        }  
   
        /// <summary>  
        /// 方法二  
        /// HashAlgorithm加密  
        /// 这种加密是  字母加-加字符    
        /// Example: password是admin 加密变成后19-A2-85-41-44-B6-3A-8F-76-17-A6-F2-25-01-9B-12  
        /// </summary>  
        /// <param name="password"></param>  
        /// <returns></returns>  
        public String HashEncrypt(string password)  
        {  
            Byte[] hashedBytes = null;  
            try  
            {  
                Byte[] clearBytes = new UnicodeEncoding().GetBytes(password);  
                hashedBytes = ((HashAlgorithm)CryptoConfig.CreateFromName("MD5")).ComputeHash(clearBytes);  
            }  
            catch (Exception ex)  
            {  
                ILog log = log4net.LogManager.GetLogger(this.GetType());  
                log.Error("==============你引起了一个错误是==============" + ex.Message.ToString());  
            }  
            return BitConverter.ToString(hashedBytes);//MD5加密  
        }  
   
        /// <summary>  
        /// 方法三:  
        /// MD5  +   HashCode加密  
        /// Example: password是admin 加密变成后 895b7da64943134be17b825ce118456c  
        /// </summary>  
        /// <returns></returns>  
        public String MD5HashCodeEncrypt(string EncryptPwd)  
        {  
            return MD5Encrypt(HashEncrypt(EncryptPwd)); //在HashEncrypt基础上再MD5  
        }  
   
        /// <summary>  
        /// 方法四:  
        /// HashCode +MD5 加密  
        /// Example: password是admin 加密变成后EB-1D-6D-E2-FC-F1-CD-94-4D-75-78-E6-3D-7A-12-32  
        /// </summary>  
        /// <param name="EncryptPwd"></param>  
        /// <returns></returns>  
        public String HashCodeMD5Encrypt(string EncryptPwd)  
        {  
            return HashEncrypt(MD5Encrypt(EncryptPwd)); //在MD5基础再HashCode  
        }  
        /// <summary>  
        /// 方法五  
        /// </summary>  
        /// <param name="EncryptPwd"></param>  
        /// <returns></returns>  
   
        public String HashMD5Encrypt(string EncryptPwd)  
        {  
            return HashCodeMD5Encrypt(HashCodeMD5Encrypt(EncryptPwd)); //在HashCodeMD5Encrypt基础再HashCode  
        }  
        /// <summary>  
        /// 方法六  
        /// 哈哈是不是有点晕呢？  
        /// 大家伙可以继续写.  
        /// </summary>  
        /// <param name="EncryptPwd"></param>  
        /// <returns></returns>  
        public String MD5HashEncrypt(string EncryptPwd)  
        {  
            return MD5HashCodeEncrypt(MD5HashCodeEncrypt(EncryptPwd)); //在MD5基础再HashCode  
        }  
        /// <summary>  
        /// 64位双重MD5小写  
        /// </summary>  
        /// <returns></returns>  
        public static string Last64(string s)  
        {  
            if (s.Length != 32)  
                return "";  
            string s1 = s.Substring(0, 16);  
            string s2 = s.Substring(16, 16);  
            return Lower32(s1) + Lower32(s2);  
        }  
        /// <summary>  
        /// 32位大写  
        /// </summary>  
        /// <returns></returns>  
        public static string Upper32(string s)  
        {  
            s = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(s, "md5").ToString();  
            return s.ToUpper();  
        }  
        /// <summary>  
        /// 32位小写  
        /// </summary>  
        /// <returns></returns>  
        public static string Lower32(string s)  
        {  
            s = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(s, "md5").ToString();  
            return s.ToLower();  
        }  
        /// <summary>  
        /// 16位大写  
        /// </summary>  
        /// <returns></returns>  
        public static string Upper16(string s)  
        {  
            s = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(s, "md5").ToString();  
            return s.ToUpper().Substring(8, 16);  
        }  
        /// <summary>  
        /// 16位小写  
        /// </summary>  
        /// <returns></returns>  
        public static string Lower16(string s)  
        {  
            s = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(s, "md5").ToString();  
            return s.ToLower().Substring(8, 16);  
        }  
    }  
   
}  

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