Encrypt Decrypt Codes

Here is codes for basi cryptography,I did not write it but found on net and tested.

public static string Encrypt(string toEncrypt, string key, bool useHashing)

{

    byte[] keyArray;

    byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

    if (useHashing)

    {

        MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();

        keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));

    }

    else

        keyArray = UTF8Encoding.UTF8.GetBytes(key);

    TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();

    tdes.Key = keyArray;

    tdes.Mode = CipherMode.ECB;

    tdes.Padding = PaddingMode.PKCS7;

    ICryptoTransform cTransform = tdes.CreateEncryptor();

    byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

    return Convert.ToBase64String(resultArray, 0, resultArray.Length);

}

public static string Decrypt(string toDecrypt, string key, bool useHashing)

{

    byte[] keyArray;

    byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);

    if (useHashing)

    {

        MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();

        keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));

    }

    else

        keyArray = UTF8Encoding.UTF8.GetBytes(key);

    TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();

    tdes.Key = keyArray;

    tdes.Mode = CipherMode.ECB;

    tdes.Padding = PaddingMode.PKCS7;

    ICryptoTransform cTransform = tdes.CreateDecryptor();

    byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

    return UTF8Encoding.UTF8.GetString(resultArray);

}

Inheritance

There are two kinds of inheritance

1. Implementation inheritance

2.Interface inheritance

Structs can not be derived from classes, they are always derived from System.ValueType.

A class cannot inheritate from multiple classes but can inherit from a class and multiple interfaces, c# is known as single inheritance programming language

When a derived class inherits from a base class, it gains all the methods, fields, properties and events of the base class. To change the data and behavior of a base class, you have two choices: you can replace the base member with a new derived member, or you can override a virtual base member.

If the method in the derived class is not preceded by new or override keywords, the compiler will issue a warning and the method will behave as if the new keyword were present

The base class method can be called from within the derived class using the base keyword.

   1: public class BaseClass

   2: {

   3:     public virtual void Test()

   4:     {

   5:         Console.WriteLine("Base");

   6:     }

   7:  

   8: }

   9: public class AClass : BaseClass

  10: {

  11:         public new void Test()

  12:         {

  13:             Console.WriteLine("AClass");

  14:         }

  15: }

  16: public class BClass : BaseClass

  17: {

  18:     public override void Test()

  19:     {

  20:         Console.WriteLine("BClass");

  21:     }

  22: }

  23: class Program

  24: {

  25:  

  26:     static void Main(string[] args)

  27:     {

  28:  

  29:         BaseClass basev = new BaseClass();

  30:         basev.Test();

  31:         BaseClass aclass = new AClass();

  32:         aclass.Test();

  33:         BaseClass bClass = new BClass();

  34:         bClass.Test();

  35:         Console.Read();

  36:  

  37:     }

  38: }

Title

Test