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Sunday, September 21, 2014 || Views:
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encrypt Bitmap image in c#
In this post I will show you how to encrypt bitmap image in c#. The technique is very simple.
First we extract header from the image and then encrypt the rest byte data and then combined the header with this encrypted data.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace Enc
{
class Program
{
static string FILENAME = @"D:\ub.bmp";
static string ENCFILENAME = @"D:\enc.bmp";
static void Main(string[] args)
{
//Create instance of DES
TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
//Generate IV and Key
des.GenerateIV();
des.GenerateKey();
//Set Encryption mode
des.Mode = CipherMode.ECB;
//Read
FileStream fileStream = new FileStream(FILENAME, FileMode.Open, FileAccess.Read);
MemoryStream ms = new MemoryStream();
fileStream.CopyTo(ms);
//Store header in byte array (we will used this after encryption)
var header = ms.ToArray().Take(54).ToArray();
//Take rest from stream
var imageArray = ms.ToArray().Skip(54).ToArray();
//Create encryptor
var enc = des.CreateEncryptor();
//Encrypt image
var encimg = enc.TransformFinalBlock(imageArray, 0, imageArray.Length);
//Combine header and encrypted image
var image = Combine(header, encimg);
//Write encrypted image to disk
File.WriteAllBytes(ENCFILENAME, image);
}
public static byte[] Combine(byte[] first, byte[] second)
{
byte[] ret = new byte[first.Length + second.Length];
Buffer.BlockCopy(first, 0, ret, 0, first.Length);
Buffer.BlockCopy(second, 0, ret, first.Length, second.Length);
return ret;
}
}
}
Conclusion:-
So In this tutorial, We are going to learn How to encrypt Bitmap image in c# with example. Happy Coding!!!!
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