asp.net tripledes encryption, decryption algorithm _ Practical skills

Using System;

Using System.Collections.Generic;

Using System.Linq;

Using System.Text;

Using System.Security.Cryptography;

Using System.IO;

Namespace WindowsFormsApplication1

{

#region TripleDES algorithm



public class Classtripledes

{

Public Classtripledes ()

{

}



Encryption, which uses a password to generate the public key of the cryptographic algorithm and encrypts the password using TripleDES.

public static string Encrypt (String pass)

{

Try

{

byte[] bt = (new System.Text.UnicodeEncoding ()). GetBytes (pass);

PasswordDeriveBytes pdb = new PasswordDeriveBytes (pass, NULL);

byte[] key = pdb. GetBytes (24);

Byte[] IV = PDB. GetBytes (8);

MemoryStream ms = new MemoryStream ();

TripleDESCryptoServiceProvider Tdesc = new TripleDESCryptoServiceProvider ();

CryptoStream cs = new CryptoStream (MS, Tdesc. CreateEncryptor (Key, iv), CryptoStreamMode.Write);

Cs. Write (BT, 0, Bt. Length);

Cs. FlushFinalBlock ();

Return convert.tobase64string (Ms. ToArray ());

}

catch (Exception ex)

{

Throw ex;

}

}



Decryption, using a password to generate the public key of the encryption algorithm, and using TripleDES to decrypt the encrypted data.

public static string Decrypt (String str, string pass)

{

Try

{

byte[] bt = convert.frombase64string (str);

PasswordDeriveBytes pdb = new PasswordDeriveBytes (pass, NULL);

byte[] key = pdb. GetBytes (24);

Byte[] IV = PDB. GetBytes (8);

MemoryStream ms = new MemoryStream ();

TripleDESCryptoServiceProvider Tdesc = new TripleDESCryptoServiceProvider ();

CryptoStream cs = new CryptoStream (MS, Tdesc. CreateDecryptor (Key, iv), CryptoStreamMode.Write);

Cs. Write (BT, 0, Bt. Length);

Cs. FlushFinalBlock ();

Return (new System.Text.UnicodeEncoding ()). GetString (Ms. ToArray ());

}

catch (Exception ex)

{

Throw ex;

}

}

Use:

String str = Encrypt ("BBB");

Console.WriteLine (Decrypt (str, "BBB"));



Encryption, which uses a password to generate the public key of the cryptographic algorithm and encrypts the password using TripleDES.

public static string Encryptwithkey (String pass, String p_key)

{

Try

{

byte[] bt = (new System.Text.UnicodeEncoding ()). GetBytes (pass);

PasswordDeriveBytes pdb = new PasswordDeriveBytes (p_key, NULL);

byte[] key = pdb. GetBytes (24);

Byte[] IV = PDB. GetBytes (8);

MemoryStream ms = new MemoryStream ();

TripleDESCryptoServiceProvider Tdesc = new TripleDESCryptoServiceProvider ();

CryptoStream cs = new CryptoStream (MS, Tdesc. CreateEncryptor (Key, iv), CryptoStreamMode.Write);

Cs. Write (BT, 0, Bt. Length);

Cs. FlushFinalBlock ();

Return convert.tobase64string (Ms. ToArray ());

}

catch (Exception ex)

{

Throw ex;

}

}



Decryption, using a password to generate the public key of the encryption algorithm, and using TripleDES to decrypt the encrypted data.

public static string Decryptwithkey (String str, string p_key)

{

Try

{

byte[] bt = convert.frombase64string (str);

PasswordDeriveBytes pdb = new PasswordDeriveBytes (p_key, NULL);

byte[] key = pdb. GetBytes (24);

Byte[] IV = PDB. GetBytes (8);

MemoryStream ms = new MemoryStream ();

TripleDESCryptoServiceProvider Tdesc = new TripleDESCryptoServiceProvider ();

CryptoStream cs = new CryptoStream (MS, Tdesc. CreateDecryptor (Key, iv), CryptoStreamMode.Write);

Cs. Write (BT, 0, Bt. Length);

Cs. FlushFinalBlock ();

Return (new System.Text.UnicodeEncoding ()). GetString (Ms. ToArray ());

}

catch (Exception ex)

{

Throw ex;

}

}



}



#endregion

}