This article mainly introduces the DES encryption and decryption in ASP. MD5 encryption Helper Class instance code, very good, with reference value, the need for friends can refer to the following
public class Trialhelper {//default key vector private static byte[] Keys = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF} ; <summary>//DES encrypted strings///</summary>//<param name= "encryptstring" > Strings to be encrypted </param> <param name= "Encryptkey" > Encryption key, requires 8-bit </param>//<returns> encryption to successfully return the encrypted string, failed to return the source string </returns> ; public static string Encryptdes (String encryptstring, String encryptkey = "") {try {if (string). IsNullOrEmpty (Encryptkey) | | Encryptkey.length < 8) {Encryptkey = "winform01"; } byte[] RgbKey = Encoding.UTF8.GetBytes (encryptkey.substring (0, 8)); byte[] Rgbiv = Keys; byte[] Inputbytearray = Encoding.UTF8.GetBytes (encryptstring); DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider (); MemoryStream mstream = new MemoryStream (); CryptoStream cstream = new CryptoStream (Mstream, Dcsp.createencryptor (RgbKey, Rgbiv), CryptostreaMmode.write); Cstream.write (Inputbytearray, 0, inputbytearray.length); Cstream.flushfinalblock (); Return convert.tobase64string (Mstream.toarray ()); } catch {return encryptstring; }}///<summary>//des decryption string///</summary>//<param name= "decryptstring" > String to Decrypt < /param>//<param name= "Decryptkey" > Decryption key, required for 8-bit, same as encryption key </param>//<returns> decryption succeeded in returning decrypted string, failed to return SOURCE string </returns> public static string Decryptdes (String decryptstring, String decryptkey = "") {try { if (string. IsNullOrEmpty (Decryptkey) | | Decryptkey.length < 8) {Decryptkey = "winform01"; } byte[] RgbKey = Encoding.UTF8.GetBytes (decryptkey.substring (0, 8)); byte[] Rgbiv = Keys; byte[] Inputbytearray = convert.frombase64string (decryptstring); DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider (); MemoryStream mstream = newMemoryStream (); CryptoStream cstream = new CryptoStream (Mstream, DCSP. CreateDecryptor (RgbKey, Rgbiv), cryptostreammode.write); Cstream.write (Inputbytearray, 0, inputbytearray.length); Cstream.flushfinalblock (); Return Encoding.UTF8.GetString (Mstream.toarray ()); } catch {return decryptstring; }}///<summary>//MD5 Data encryption///</summary>//<param name= "Sdatain" > Encrypted fields </param> <returns> Encrypted strings </returns> public static string GetMD5 (String sdatain) {system.security. Cryptography.md5cryptoserviceprovider MD5 = new System.Security.Cryptography.MD5CryptoServiceProvider (); Byte[] Bytvalue, Bythash; Bytvalue = System.Text.Encoding.UTF8.GetBytes (Sdatain); Bythash = Md5.computehash (Bytvalue); MD5. Clear (); String stemp = ""; for (int i = 0; i < bythash.length; i++) {stemp + = Bythash[i]. ToString ("X"). PadLeft (2, ' 0 '); }return stemp; } }
Call:
Get login information loginrecord.name = TbName.Text.Trim (); Loginrecord.md5pwd = TRIALHELPER.GETMD5 (Tbpwd.password); Save to database MD5 encryption mode LOGINRECORD.PWD = Trialhelper.encryptdes (Tbpwd.password);//Remember Password des encryption, save to local