方法一：
//须添加对System.Web的引用 using System.Web.Security; ... /// <summary> /// SHA1加密字符串 /// </summary> /// <param name="source">源字符串</param> /// <returns>加密后的字符串</returns> public string SHA1(string source) { return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "SHA1"); } /// <summary> /// MD5加密字符串 /// </summary> /// <param name="source">源字符串</param> /// <returns>加密后的字符串</returns> public string MD5(string source) { return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "MD5");; }方法二(可逆加密解密)： using System.Security.Cryptography; ... public string Encode(string data) { byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64); byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64); DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); int i = cryptoProvider.KeySize; MemoryStream ms = new MemoryStream(); CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write); StreamWriter sw = new StreamWriter(cst); sw.Write(data); sw.Flush(); cst.FlushFinalBlock(); sw.Flush(); return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length); } public string Decode(string data) { byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64); byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64); byte[] byEnc; try { byEnc = Convert.FromBase64String(data); } catch { return null; } DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); MemoryStream ms = new MemoryStream(byEnc); CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read); StreamReader sr = new StreamReader(cst); return sr.ReadToEnd(); }
using System; using System.Security.Cryptography;//这个是处理文字编码的前提 using System.Text; using System.IO; /// <summary> /// DES加密方法 /// </summary> /// <param name="strPlain">明文</param> /// <param name="strDESKey">密钥</param> /// <param name="strDESIV">向量</param> /// <returns>密文</returns> public string DESEncrypt(string strPlain,string strDESKey,string strDESIV) { //把密钥转换成字节数组 byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey); //把向量转换成字节数组 byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV); //声明1个新的DES对象 DESCryptoServiceProvider desEncrypt=new DESCryptoServiceProvider(); //开辟一块内存流 MemoryStream msEncrypt=new MemoryStream(); //把内存流对象包装成加密流对象 CryptoStream csEncrypt=new CryptoStream(msEncrypt,desEncrypt.CreateEncryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Write); //把加密流对象包装成写入流对象 StreamWriter swEncrypt=new StreamWriter(csEncrypt); //写入流对象写入明文 swEncrypt.WriteLine(strPlain); //写入流关闭 swEncrypt.Close(); //加密流关闭 csEncrypt.Close(); //把内存流转换成字节数组，内存流现在已经是密文了 byte[] bytesCipher=msEncrypt.ToArray(); //内存流关闭 msEncrypt.Close(); //把密文字节数组转换为字符串，并返回 return UnicodeEncoding.Unicode.GetString(bytesCipher); } /// <summary> /// DES解密方法 /// </summary> /// <param name="strCipher">密文</param> /// <param name="strDESKey">密钥</param> /// <param name="strDESIV">向量</param> /// <returns>明文</returns> public string DESDecrypt(string strCipher,string strDESKey,string strDESIV) { //把密钥转换成字节数组 byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey); //把向量转换成字节数组 byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV); //把密文转换成字节数组 byte[] bytesCipher=UnicodeEncoding.Unicode.GetBytes(strCipher); //声明1个新的DES对象 DESCryptoServiceProvider desDecrypt=new DESCryptoServiceProvider(); //开辟一块内存流，并存放密文字节数组 MemoryStream msDecrypt=new MemoryStream(bytesCipher); //把内存流对象包装成解密流对象 CryptoStream csDecrypt=new CryptoStream(msDecrypt,desDecrypt.CreateDecryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Read); //把解密流对象包装成读出流对象 StreamReader srDecrypt=new StreamReader(csDecrypt); //明文=读出流的读出内容 string strPlainText=srDecrypt.ReadLine(); //读出流关闭 srDecrypt.Close(); //解密流关闭 csDecrypt.Close(); //内存流关闭 msDecrypt.Close(); //返回明文 return strPlainText; }