C#

N a v a n e e t h wrote:

it depends on the context

N a v a n e e t h wrote:

Local variables goes to the stack, but instance variables will be on heap

Luc Pattyn [Forum Guidelines] [My Articles]

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gigahertz205 wrote:

Do uninitialized value types take space too?

N a v a n e e t h wrote:

So it takes space needed for keeping that value.

Luc Pattyn [Forum Guidelines] [My Articles]

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Luc Pattyn wrote:

memory space only when the MMU page is actually needed.

N a v a n e e t h wrote:

So int[] numbers would take 4KB of memory and will be kept on managed heap.

gigahertz205 wrote:

How much memory do uninitialized arrays take up? EX: int[] numbers;

gigahertz205 wrote:

Do uninitialized value types take space too?

using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace Crypt
{
    class Program
    {
        public static string password;
        static void Main(string[] args)
        {
            Console.Write("Please enter your password: ");
            password = Console.ReadLine();
            string plainKey = "Test key";
            string value = "Test value";
            MyDictionary myDictionary = new MyDictionary();
            Console.WriteLine("Adding key: " + plainKey);
            myDictionary.AddItem(plainKey, value);
            Console.WriteLine("Looking for " + plainKey.Encrypt(password));
            Console.WriteLine("Found :" + myDictionary.ContainsKey(plainKey.Encrypt(password)));
            Console.WriteLine("Dictionary contents:");
            foreach (KeyValuePair<string, string> entry in myDictionary)
            {
                Console.WriteLine("Encrypted: " + entry.Key);
                Console.WriteLine("Decrypted: " + entry.Key.Decrypt(password));
            }
            Console.ReadKey();
        }
    }

    class MyDictionary : SortedDictionary<string, string>
    {
        public void AddItem(string plainKey, string value)
        { this.Add(plainKey.Encrypt(Program.password), value); }
    }

    public static class Extensions
    {
        public static string Encrypt(this string str, string password)
        {
            RijndaelManaged cipher = new RijndaelManaged();
            byte[] plainText = System.Text.Encoding.Unicode.GetBytes(str);
            byte[] salt = Encoding.ASCII.GetBytes(password.Length.ToString());
            cipher.Padding = PaddingMode.ISO10126;
            PasswordDeriveBytes key = new PasswordDeriveBytes(password, salt);
            ICryptoTransform encryptor = cipher.CreateEncryptor(key.GetBytes(32), key.GetBytes(16));
            MemoryStream memoryStream = new MemoryStream();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
            cryptoStream.Write(plainText, 0, plainText.Length);
            cryptoStream.FlushFinalBlock();
            byte[] cipherBytes = memoryStream.ToArray();
            memoryStream.Close();
            cryptoStream.Close();
            return Convert.ToBase64String(cipherBytes);
        }
        public static string Decrypt(this string str, string password)
        {
            try
            {
                RijndaelManaged cipher = new RijndaelManaged();
                byte[] encryptedText = Convert.FromBase64String(str);
                byte[] salt = Encoding.ASCII.GetBytes(password.Length.ToString());
                cipher.Padding = PaddingMode.ISO10126;
                PasswordDeriveBytes key = new PasswordDeriveBytes(password, salt);
                ICryptoTransform decryptor = cipher.CreateDecryptor(key.GetBytes(32), key.GetBytes(16));
                MemoryStream memoryStream = new MemoryStream(encryptedText);
                CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
                byte[] plainText = new byte[encryptedText.Length];
                int decryptedCount = cryptoStream.Read(plainText, 0, plainText.Length);
                memoryStream.Close();
                cryptoStream.Close();
                return Encoding.Unicode.GetString(plainText, 0, decryptedCount);
            }
            catch
            { return string.Empty; }
        }
    }
}