C#加密帮助类EncryptHelper

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///之前这篇加密帮助类觉得不够严谨,不够强，所以特意修改,也对自己负责一点，如果对你有帮助可以看看,///呵呵！~这个类都经过本人测试过都没问题. 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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