C＃DEC加密算法
C＃加密算法using System;using System.Security.Cryptography;using System.IO;using System.Text;namespace NetTrade{ /// <summary> /// Security 的摘要说明。 /// 类中URL及帐号加密使用了不同的KEY。调用URL加密过程如下：///EIP.Framework.Security objSecurity = new EIP.Framework.Security();///objSecurity.EncryptQueryString(''待加密的字符串'');///解密:objSecurity.DecryptQueryString(''传递过来的参数); /// </summary> public class Security {string _QueryStringKey = "yx139222"; //URL传输参数加密Key string _PassWordKey = "yx139222";//PassWord加密Key public Security() { // // TODO: 在此处添加构造函数逻辑 // } /// /// 加密URL传输的字符串 /// /// /// public string EncryptQueryString(string QueryString) { return Encrypt(QueryString,_QueryStringKey); } /// /// 解密URL传输的字符串 /// /// /// public string DecryptQueryString(string QueryString) { return Decrypt(QueryString,_QueryStringKey); } /// /// 加密帐号口令 /// /// /// public string EncryptPassWord(string PassWord) { return Encrypt(PassWord,_PassWordKey); } /// /// 解密帐号口令 /// /// /// public string DecryptPassWord(string PassWord) { return Decrypt(PassWord,_PassWordKey); } /// /// DEC 加密过程 /// /// /// /// public string Encrypt(string pToEncrypt,string sKey) { DESCryptoServiceProvider des = new DESCryptoServiceProvider();//把字符串放到byte数组中 byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt); //byte[]inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt); 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 MemoryStream ms = new MemoryStream(); //使得输入密码必须输入英文文本 CryptoStream cs = new CryptoStream(ms,des.CreateEncryptor(),CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); StringBuilder ret = newStringBuilder(); foreach(byte b in ms.ToArray()) { ret.AppendFormat("{0:X2}", b); } ret.ToString(); returnret.ToString(); } /// /// DEC 解密过程 /// /// /// /// public string Decrypt(string pToDecrypt, string sKey) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray = new byte; for(int x = 0; x < pToDecrypt.Length / 2; x++) { int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16)); inputByteArray=(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(); StringBuilder ret = new StringBuilder();//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 return System.Text.Encoding.Default.GetString(ms.ToArray()); } /// /// 检查己加密的字符串是否与原文相同 /// /// /// /// /// public bool ValidateString(string EnString, string FoString, int Mode) { switch (Mode) { default: case 1: if (Decrypt(EnString,_QueryStringKey) == FoString.ToString()) { return true; } else { return false; } case 2: if (Decrypt(EnString,_PassWordKey) == FoString.ToString()) { return true; } else { return false; } } }//以下为另外一种加解密方式，比较简单 public string DecryptStr(string rs) //顺序减1解码{ byte[] by=new byte; for(int i=0;i<=rs.Length-1;i++) { by=(byte)((byte)rs-1); } rs=""; for(int i=by.Length-1;i>=0;i--) { rs+=((char)by).ToString(); } return rs;}public string EncryptStr(string rs) //倒序加1加密{ byte[] by=new byte; for(int i=0;i<=rs.Length-1;i++) { by=(byte)((byte)rs+1); } rs=""; for(int i=by.Length-1;i>=0;i--) { rs+=((char)by).ToString(); } return rs;} } }
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