Bitmap image manipulation

About

This is a project I made for my Procedural Programming (C lang) class at the university. I had to do a program that can encrypt a BMP file and decrypt it using a given secret key.

The encryption part is detailed in the Proiect programare procedurala.pdf file.

The encryption part

Read a BMP file in the intern memory
Swap pixels order with XORSHIFT32 algorithm
Encrypt pixels with the given key
Save the encrypted image into BMP format.
Decrypt the resulting image to verify that you made the encyption in a correct manner.

Input image:

Output image (crypted):

The template matching part

Read a BMP file in the intern memory
Read the templates of the given digits (BMP files)
Implement the template matching algorithm
Create colored rectangles over the original image to evidentiate the patterns found.
Eliminate the overlapping rectangles that obstruct the other rectangles already formed.

Output image:

Test yourself

Install CodeBlocks IDE
Clone this repository and open Proiect_PP.cbp with CodeBlocks
You are ready to run this project.

Optional

You can modify cripteaza.txt to look like:

./input/your_image.bmp  -> Input path
./output/your_image_encrypted.bmp  -> Output path
your_secret_code.txt  -> Secret key

Where ./input/your_image.bmp can be any BMP format image path and your_secret_code.txt is a .txt file which contains your secret encyption code. The output image will be stored here ./output/your_image_encrypted.bmp

You can modify decripteaza.txt to look like:

./output/output_encrypted.bmp  -> Encrypted input image
./output/output_decrypted.bmp  -> Decrypted output image
your_secret_key.txt  -> Secret key