using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;
using System.Configuration;namespace Blog.Common
{/// <summary>/// 通用加密/解密类。/// </summary>public class Encrypt{#region ====对称加密(向量)=====//SymmetricAlgorithm 所有对称算法的实现都必须从中继承的抽象基类private SymmetricAlgorithm mobjCryptoService;private string key;public Encrypt(){mobjCryptoService = new RijndaelManaged();key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";//自定义的密串
        }/// <summary>/// 获得密钥/// </summary>/// <returns>密钥</returns>private byte[] GetLegalKey(){string sTemp = key;mobjCryptoService.GenerateKey();// 当在派生类中重写时，生成用于该算法的随机密钥byte[] bytTemp = mobjCryptoService.Key;int KeyLength = bytTemp.Length;if (sTemp.Length > KeyLength)sTemp = sTemp.Substring(0, KeyLength);else if (sTemp.Length < KeyLength)sTemp = sTemp.PadRight(KeyLength, ' ');return ASCIIEncoding.ASCII.GetBytes(sTemp);}/// <summary>/// 获得初始向量IV/// </summary>/// <returns>初试向量IV</returns>private byte[] GetLegalIV(){string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";mobjCryptoService.GenerateIV();byte[] bytTemp = mobjCryptoService.IV;// 获取或设置对称算法的初始化向量int IVLength = bytTemp.Length;//获得一个 32 位整数，表示 System.Array 的所有维数中元素的总数if (sTemp.Length > IVLength)sTemp = sTemp.Substring(0, IVLength);else if (sTemp.Length < IVLength)sTemp = sTemp.PadRight(IVLength, ' ');return ASCIIEncoding.ASCII.GetBytes(sTemp);}/// <summary>/// 加密方法(请先实例化Encrypt类)/// </summary>/// <param name="Source">待加密的串</param>/// <returns>经过加密的串</returns>public string EncrypStrByIV(string Source){byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);MemoryStream ms = new MemoryStream();mobjCryptoService.Key = GetLegalKey();mobjCryptoService.IV = GetLegalIV();ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);cs.Write(bytIn, 0, bytIn.Length);cs.FlushFinalBlock();ms.Close();byte[] bytOut = ms.ToArray();return Convert.ToBase64String(bytOut);}/// <summary>/// 解密方法(请先实例化Encrypt类)/// </summary>/// <param name="Source">待解密的串</param>/// <returns>经过解密的串</returns>public string DecrypStrByIV(string Source){byte[] bytIn = Convert.FromBase64String(Source);MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);mobjCryptoService.Key = GetLegalKey();mobjCryptoService.IV = GetLegalIV();ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);StreamReader sr = new StreamReader(cs);return sr.ReadToEnd();}#endregion#region ========DES加密========/// <summary>/// DES加密/// </summary>/// <param name="Text">待加密的字符串</param>/// <returns>加密后的字符串</returns>public static string DESEncrypt(string Text){return DESEncrypt(Text, "loveyajuan");}/// <summary> /// DES加密数据 /// </summary> /// <param name="Text">待加密的字符串</param> /// <param name="sKey">加密密钥</param> /// <returns>加密后的字符串</returns> public static string DESEncrypt(string Text, string sKey){DESCryptoServiceProvider des = new DESCryptoServiceProvider();byte[] inputByteArray;inputByteArray = Encoding.Default.GetBytes(Text);des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));System.IO.MemoryStream ms = new System.IO.MemoryStream();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);}return ret.ToString();}#endregion#region ========DES解密========/// <summary>/// DES解密/// </summary>/// <param name="Text">待解密的字符串</param>/// <returns>解密后的明文</returns>public static string DESDecrypt(string Text){return DESDecrypt(Text, "loveyajuan");}/// <summary> /// DES解密数据 /// </summary> /// <param name="Text">待解密的字符串</param> /// <param name="sKey">解密密钥</param> /// <returns>解密后的明文</returns> public static string DESDecrypt(string Text, string sKey){DESCryptoServiceProvider des = new DESCryptoServiceProvider();int len;len = Text.Length / 2;byte[] inputByteArray = new byte[len];int x, i;for (x = 0; x < len; x++){i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);inputByteArray[x] = (byte)i;}des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));System.IO.MemoryStream ms = new System.IO.MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();return Encoding.Default.GetString(ms.ToArray());}#endregion#region ========MD5加密========/// <summary>/// MD5加密/// </summary>/// <param name="paramstr"></param>/// <returns></returns>public static string MD5Encrypt(string paramstr){string privateKey = "loveyajuan";string tempStr = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(privateKey, "MD5");return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(paramstr + tempStr, "MD5").ToLower();}#endregion#region ====倒序加1加密解密====/// <summary>/// 倒序加1加密/// </summary>/// <param name="rs"></param>/// <returns></returns>public static string EncryptOrderStr(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;}/// <summary>/// 顺序减1解码 /// </summary>/// <param name="rs"></param>/// <returns></returns>public static string DecryptOrderStr(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;}#endregion#region =====Escape加密解密====/*statement：处理全角字符还是有问题的*//// <summary>/// Escape加密/// </summary>/// <param name="str"></param>/// <returns></returns>public static string Escape(string str){if (str == null){return String.Empty;}StringBuilder sb = new StringBuilder();int len = str.Length;for (int i = 0; i < len; i++){char c = str[i];if (Char.IsLetterOrDigit(c) || c == '-' || c == '_' || c == '/' || c == '\\' || c == '.'){sb.Append(c);}else{sb.Append(Uri.HexEscape(c));}}return sb.ToString();}/// <summary>/// UnEscape解密/// </summary>/// <param name="str"></param>/// <returns></returns>public static string UnEscape(string str){if (str == null){return String.Empty;}StringBuilder sb = new StringBuilder();int len = str.Length;int i = 0;while (i != len){if (Uri.IsHexEncoding(str, i)){sb.Append(Uri.HexUnescape(str, ref i));}else{sb.Append(str[i++]);}}return sb.ToString();}#endregion#region ======Base64编解码=====/// <summary>/// Base64编码/// </summary>/// <param name="code_type">编码类型</param>/// <param name="code">待编码的字符串</param>/// <returns></returns>public static string Base64Encode(string code_type, string code){string encode = "";byte[] bytes = Encoding.GetEncoding(code_type).GetBytes(code);try{encode = Convert.ToBase64String(bytes);}catch{encode = code;}return encode;}/// <summary>/// Base64解码/// </summary>/// <param name="code_type">编码类型</param>/// <param name="code">带解码的字符串</param>/// <returns></returns>public static string Base64Decode(string code_type, string code){string decode = "";byte[] bytes = Convert.FromBase64String(code);try{decode = Encoding.GetEncoding(code_type).GetString(bytes);}catch{decode = code;}return decode;}#endregion}
}