C# 哈希加密

1.方法一:

//适用于C#语言
//使用前需导入以下命名空间：using System.Web.Security;
//第一个参数为需加密的字符串，第二个参数为加密的格式（只有SHA1和MD5两种，可任选一种）
public string EncryptPassword(string PasswordString, string PasswordFormat)
    {
        string EncryptPassword = null;
        if ("SHA1".Equals(PasswordFormat))
        {
            EncryptPassword = FormsAuthentication.HashPasswordForStoringInConfigFile(PasswordString, "SHA1");
        }
        else if ("MD5".Equals(PasswordFormat))
        {
            EncryptPassword = FormsAuthentication.HashPasswordForStoringInConfigFile(PasswordString, "MD5");
        }
        else
        {
            EncryptPassword = PasswordString;
        }
        return EncryptPassword;
    }


//======================加密解密方法=====================

using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;/**//// <summary>
        /// DEC 加密过程
        /// </summary>
        /// <param name="pToEncrypt">被加密的字符串</param>
        /// <param name="sKey">密钥（只支持8个字节的密钥）</param>
        /// <returns>加密后的字符串</returns>
        public string Encrypt(string pToEncrypt, string sKey)
        ...{
            //访问数据加密标准(DES)算法的加密服务提供程序 (CSP) 版本的包装对象
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);　//建立加密对象的密钥和偏移量
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);　 //原文使用ASCIIEncoding.ASCII方法的GetBytes方法

            byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);//把字符串放到byte数组中

            MemoryStream ms = new MemoryStream();//创建其支持存储区为内存的流
            //定义将数据流链接到加密转换的流
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            //上面已经完成了把加密后的结果放到内存中去

            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            ...{
                ret.AppendFormat("{0:X2}", b);
            }
            ret.ToString();
            return ret.ToString();
        }

       /**//**//**//// <summary>
        /// DEC 解密过程
       /// </summary>
        /// <param name="pToDecrypt">被解密的字符串</param>
        /// <param name="sKey">密钥（只支持8个字节的密钥，同前面的加密密钥相同）</param>
       /// <returns>返回被解密的字符串</returns>
        public string Decrypt(string pToDecrypt, string sKey)
        ...{
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            ...{
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }

            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);　//建立加密对象的密钥和偏移量，此值重要，不能修改
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            //建立StringBuild对象，createDecrypt使用的是流对象，必须把解密后的文本变成流对象
            StringBuilder ret = new StringBuilder();

            return System.Text.Encoding.Default.GetString(ms.ToArray());
        }

具体在程序中使用加密解密算法的例子如下： 在发送页面 Response.Redirect("~/GridView.aspx?ID=" + Encrypt("zlh","abcdefgh"));

 

在接受页面 string acceptStr; acceptStr = Decrypt(Request.QueryString["ID"],"abcdefgh");

转贴来源:http://hi.baidu.com/4092887/blog/item/4dfd89efaf805ee5cf1b3e5a.html

 

2.方法二:(简单)

  FormsAuthentication.HashPasswordForStoringInConfigFile(string, "SHA1");

 或

 FormsAuthentication.HashPasswordForStoringInConfigFile(String, "MD5");