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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 = new StringBuilder(); foreach(byte b in ms.ToArray()) { ret.AppendFormat("{0:X2}", b); } ret.ToString(); return ret.ToString(); } /// /// DEC 解密过程 /// /// /// /// 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(); 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[rs.Length]; for(int i=0;i<=rs.Length-1;i++) { by[i]=(byte)((byte)rs[i]-1); } rs=""; for(int i=by.Length-1;i>=0;i--) { rs+=((char)by[i]).ToString(); } return rs; } public string EncryptStr(string rs) //倒序加1加密 { byte[] by=new byte[rs.Length]; for(int i=0;i<=rs.Length-1;i++) { by[i]=(byte)((byte)rs[i]+1); } rs=""; for(int i=by.Length-1;i>=0;i--) { rs+=((char)by[i]).ToString(); } return rs; } } } |
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