asp.net中的加密解密

简单的使用://--导入所需要的包using System.IO;using System.Text;using System.Security.Cryptography;(1)MD5普通加密//获取要加密的字段，并转化为Byte[]数组        byte[] data = System.Text.Encoding.Unicode        .GetBytes(TextBox1.Text.ToCharArray());        //建立加密服务        System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();        //加密Byte[]数组        byte[] result = md5.ComputeHash(data);        Label1.Text = "MD5普通加密：" + System.Text.Encoding.Unicode.GetString(result);(2)MD5密码加密[常用]Label1.Text = "MD5密码加密：" + System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(TextBox1.Text, "MD5");(3)ASP.NET中加密与解密QueryString的方法[常用]//加密 Response.Redirect("DetailInfo.aspx?id=" + Convert.ToBase64String(System.Text.Encoding.Default.GetBytes("whaben")).Replace("+","%2B"));//解密string ID = System.Text.Encoding.Default.GetString(Convert.FromBase64String(Request.QueryString["id"].ToString().Replace("%2B","+")));二、DES加密及解密的算法[常用密钥算法]简单的使用://--导入所需要的包using System.IO;using System.Text;using System.Security.Cryptography;public static string Key = "DKMAB5DE";//加密密钥必须为8位//加密算法public static string MD5Encrypt(string pToEncrypt)       {           DESCryptoServiceProvider des = new DESCryptoServiceProvider();           byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);           des.Key = ASCIIEncoding.ASCII.GetBytes(Key);           des.IV = ASCIIEncoding.ASCII.GetBytes(Key);           MemoryStream ms = new 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);           }           ret.ToString();           return ret.ToString();       }//解密算法public static string MD5Decrypt(string pToDecrypt)       {           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(Key);           des.IV = ASCIIEncoding.ASCII.GetBytes(Key);           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();           return System.Text.Encoding.ASCII.GetString(ms.ToArray());       }  三、RSA加密及解密的算法[常用密钥算法]简单的使用://--导入所需要的包using System.Text;using System.Security.Cryptography;//加密算法public string RSAEncrypt(string encryptString)    {        CspParameters csp = new CspParameters();        csp.KeyContainerName = "whaben";        RSACryptoServiceProvider RSAProvider = new RSACryptoServiceProvider(csp);        byte[] encryptBytes = RSAProvider.Encrypt(ASCIIEncoding.ASCII.GetBytes(encryptString), true);        string str = "";        foreach (byte b in encryptBytes)        {            str = str + string.Format("{0:x2}", b);        }        return str;    }//解密算法public string RSADecrypt(string decryptString)    {        CspParameters csp = new CspParameters();        csp.KeyContainerName = "whaben";        RSACryptoServiceProvider RSAProvider = new RSACryptoServiceProvider(csp);        int length = (decryptString.Length / 2);        byte[] decryptBytes = new byte[length];        for (int index = 0; index < length; index++)        {            string substring = decryptString.Substring(index * 2, 2);            decryptBytes[index] = Convert.ToByte(substring, 16);        }        decryptBytes = RSAProvider.Decrypt(decryptBytes, true);        return ASCIIEncoding.ASCII.GetString(decryptBytes);    }