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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C#加密帮助类EncryptHelper
