加密

 

调用

DES md = new  DES();

System.Web.HttpContext.Current.Response.Cookies[ " CompanyID " ].Value = System.Web.HttpContext.Current.Server.UrlEncode(md.DESEncrypt(myCompanyID));
System.Web.HttpContext.Current.Response.Cookies[ " UserID " ].Value = System.Web.HttpContext.Current.Server.UrlEncode(md.DESEncrypt(us));

string  myCompanyID = System.Web.HttpContext.Current.Request.Cookies[ " CompanyID " ].Value;
myCompanyID = md.DESDecrypt(System.Web.HttpContext.Current.Server.UrlDecode(myCompanyID)).Replace( "

DES.cs文件

using  System;
using  System.IO;
using  System.Text;
using  System.Security;
using  System.Security.Cryptography;
using  System.Collections;

namespace  CM_class
... {
    /**//// <summary>
    /// DES 的摘要说明。
    /// DES加密、解密
    /// </summary>
    public class DES
    ...{
        public static byte[] DESKey = new byte[] ...{0x82, 0xBC, 0xA1, 0x6A, 0xF5, 0x87, 0x3B, 0xE6, 0x59, 0x6A, 0x32, 0x64, 0x7F, 0x3A, 0x2A, 0xBB, 0x2B, 0x68, 0xE2, 0x5F, 0x06, 0xFB, 0xB8, 0x2D, 0x67, 0xB3, 0x55, 0x19, 0x4E, 0xB8, 0xBF, 0xDD };
        public DES()
        ...{
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
        /**//// <summary>
        /// DES加密
        /// </summary>
        /// <param name="strSource">待加密字串</param>
        /// <param name="key">32位Key值</param>
        /// <returns>加密后的字符串</returns>
        public string DESEncrypt(string strSource) 
        ...{
            return DESEncrypt(strSource, DESKey);
        }
        public string DESEncrypt(string strSource,byte[] key)
        ...{
            SymmetricAlgorithm sa = Rijndael.Create();
            sa.Key = key;
            sa.Mode= CipherMode.ECB;
            sa.Padding = PaddingMode.Zeros;
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, sa.CreateEncryptor(), CryptoStreamMode.Write);
            byte[] byt = Encoding.Unicode.GetBytes(strSource);
            cs.Write(byt, 0, byt.Length);
            cs.FlushFinalBlock();
            cs.Close();
            return Convert.ToBase64String(ms.ToArray());
        }
        /**//// <summary>
        /// DES解密
        /// </summary>
        /// <param name="strSource">待解密的字串</param>
        /// <param name="key">32位Key值</param>
        /// <returns>解密后的字符串</returns>
        public string DESDecrypt(string strSource) 
        ...{
            return DESDecrypt(strSource, DESKey);
        }
        public string DESDecrypt(string strSource,byte[] key)
        ...{
            SymmetricAlgorithm sa = Rijndael.Create();
            sa.Key = key;
            sa.Mode = CipherMode.ECB;
            sa.Padding = PaddingMode.Zeros;
            ICryptoTransform ct = sa.CreateDecryptor();
            byte[] byt = Convert.FromBase64String(strSource);
            MemoryStream ms = new MemoryStream(byt);
            CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Read);
            StreamReader sr = new StreamReader(cs, Encoding.Unicode);
            return sr.ReadToEnd();
        }
    }
}