An example of DES encryption/decryption class in asp.net

DES encryption function

The code is as follows

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Default key vector private static byte[] Keys = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; <summary> Des encrypted string </summary> <param name= "encryptstring" > Strings to be encrypted </param> <param name= "Encryptkey" > Encryption key required for 8-bit </param> <returns> encryption successfully returned the encrypted string, failed to return the source string </returns> public static string Encryptdes (String encryptstring, String encryptkey) { Try { 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" > Strings to be decrypted </param> <param name= "Decryptkey" > Decryption key, required 8-bit, same as encryption key </param> <returns> decryption successfully returned decrypted string, failed back source string </returns> public static string Decryptdes (String decryptstring, String decryptkey) { Try { byte[] Rgbkey = Encoding.UTF8.GetBytes (Decryptkey); byte[] Rgbiv = Keys; byte[] Inputbytearray = convert.frombase64string (decryptstring); DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider (); MemoryStream mstream = new MemoryStream (); 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; } }

Now we put the password and decryption together.

The code is as follows

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Using System; Using System.Security.Cryptography; Using System.Text; <summary> DES encryption/Decryption class. Litianping </summary> public class Desencrypt { Public Desencrypt () { } #region ======== Encryption ======== <summary> Encryption </summary> <param name= "Text" ></param> <returns></returns> public static string Encrypt (String Text) { Return Encrypt (Text, "Maticsoft"); } <summary> Encrypt data </summary> <param name= "Text" ></param> <param name= "SKey" ></param> <returns></returns> public static string Encrypt (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 ======== Decryption ======== <summary> Decrypt </summary> <param name= "Text" ></param> <returns></returns> public static string Decrypt (String Text) { Return Decrypt (Text, "Maticsoft"); } <summary> Decrypting data </summary> <param name= "Text" ></param> <param name= "SKey" ></param> <returns></returns> public static string Decrypt (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 }