pixel_encrypt.py

from Crypto.PublicKey import RSA
from Crypto.Random import get_random_bytes
from Crypto.Cipher import AES, PKCS1_OAEP
from Crypto.Hash import RIPEMD160, SHA256
import base58
import base64
import cv2
import numpy as np
import os
import uuid 
import qrcode as qr 
import math
from PIL import ImageFont, ImageDraw, Image

def process(img,font_text,font_fac,font_x,font_y,font_col,font_op):
    img.save('tmp.png')
    img = Image.open('tmp.png').convert("RGBA") 
    im=img
    txt = Image.new('RGBA', im.size, (255,255,255,0))
    w, h = im.size
    h1 = font_col.strip("#")
    rgb_tup = tuple(int(h1[i:i+2], 16) for i in (0, 2, 4))
    a,b,c = rgb_tup
    t_fill = (a,b,c,font_op)
    x = int(font_x)
    y = int(font_y)
    draw = ImageDraw.Draw(txt)
    text = f'{font_text}'
    font_size=font_fac
    font = ImageFont.truetype("./fonts/SansitaOne.ttf", int(font_size))
    size = font.getsize(text)
    draw.text((x-size[0]/2, y),text, font = font, fill=t_fill)
    combined = Image.alpha_composite(im, txt)    
    return combined
    
def textover(im,txt1="",txt2=""):
    im = Image.open(im)
    inp=1
    hh=0
    hhh=25
    cnt = inp
    font_a = 30
    font_b = 10
    if cnt >0:
        font_a = font_a + (cnt * 2)
        font_b = font_b + (cnt * 2)
        #hh = hh-int(cnt/2)
        hhh = hhh+int(cnt/2)
    w,h = im.size
    print (w)
    print (h)
    font_x = (w/2)
    font_y = h-hhh
    out = process(im,txt1,font_fac=font_a,font_x=font_x,font_y=hh,font_col="#000000",font_op=255)
    out = process(out,txt2,font_fac=font_b,font_x=font_x,font_y=font_y,font_col="#000000",font_op=255)
    return out

def make_qr(txt=None,color_f=None,color_b=None):
    qrm = qr.QRCode(box_size=10,error_correction=qr.constants.ERROR_CORRECT_H)
    if color_f == None:
        color_f = "#000"
    if color_b == None:
        color_b = "#fff"
    if txt != None and txt != "" and data == None:
        out = f'{txt}'
        print (f'txt {out}')
        qrm.add_data(out)
        qrm.make(fit=True)
        img1 = qrm.make_image(fill_color=color_f, back_color=color_b)
        img1.save("im2.png")
        return "im2.png"  

def to_bin(data):
    """Convert `data` to binary format as string"""
    if isinstance(data, str):
        return ''.join([ format(ord(i), "08b") for i in data ])
    elif isinstance(data, bytes):
        return ''.join([ format(i, "08b") for i in data ])
    elif isinstance(data, np.ndarray):
        return [ format(i, "08b") for i in data ]
    elif isinstance(data, int) or isinstance(data, np.uint8):
        return format(data, "08b")
    else:
        raise TypeError("Type not supported.")
def decode(image_name,txt=None):
    BGRimage = cv2.imread(image_name)
    image = cv2.cvtColor(BGRimage, cv2.COLOR_BGR2RGB)   
    binary_data = ""
    for row in image:
        for pixel in row:
            r, g, b = to_bin(pixel)
            binary_data += r[-1]
            binary_data += g[-1]
            binary_data += b[-1]
    all_bytes = [ binary_data[i: i+8] for i in range(0, len(binary_data), 8) ]
    decoded_data = ""
    for byte in all_bytes:
        decoded_data += chr(int(byte, 2))
        if decoded_data[-5:] == "=====":
            break
    this = decoded_data[:-5].split("#####",1)[0]
    this = eval(this)
    enc_in=this
    return this

def encode(image_name, secret_data,txt=None):
    BGRimage = cv2.imread(image_name)
    image = cv2.cvtColor(BGRimage, cv2.COLOR_BGR2RGB)    
    n_bytes = image.shape[0] * image.shape[1] * 3 // 8
    print("[*] Maximum bytes to encode:", n_bytes)
    secret_data1=secret_data
    while True:
        if len(secret_data1)+5 < (n_bytes):
            secret_data1 = f'{secret_data1}#####'
        elif len(secret_data1)+5 >= (n_bytes):
            break    
    secret_data = secret_data1    
    if len(secret_data) > n_bytes:
        return image_name, gr.Markdown.update("""<center><h3>Input image is too large""")
    secret_data += "====="
    data_index = 0
    binary_secret_data = to_bin(secret_data)
    data_len = len(binary_secret_data)
    for row in image:
        for pixel in row:
            r, g, b = to_bin(pixel)
            if data_index < data_len:
                pixel[0] = int(r[:-1] + binary_secret_data[data_index], 2)
                data_index += 1
            if data_index < data_len:
                pixel[1] = int(g[:-1] + binary_secret_data[data_index], 2)
                data_index += 1
            if data_index < data_len:
                pixel[2] = int(b[:-1] + binary_secret_data[data_index], 2)
                data_index += 1
            if data_index >= data_len:
                break
    return image

def conv_im(im,data):
    uniqnum = uuid.uuid4()
    byte_size = len(data)
    data_pixels = byte_size*4
    data_sq = int(math.sqrt(data_pixels))
    data_pad = data_sq+100
    qr_im = im
    img1 = Image.open(qr_im)
    imgw = img1.size[0] 
    imgh = img1.size[1]
    if data_pad > imgw or data_pad > imgh :
        img1 = img1.resize((int(data_pad),int(data_pad)), Image.Resampling.LANCZOS)
    print (img1.size)
    img1.save(f'tmpim{uniqnum}.png')
    with open(f'tmpim{uniqnum}.png', "rb") as image_file:
        encoded_string = base64.b64encode(image_file.read())
        image_file.close()
    im_out = encode(f'tmpim{uniqnum}.png',data)
    return im_out
    
def calculate_hash(data, hash_function: str = "sha256") -> str:
    if type(data) == str:
        data = bytearray(data, "utf-8")
    if hash_function == "sha256":
        h = SHA256.new()
        h.update(data)
        return h.hexdigest()
    if hash_function == "ripemd160":
        h = RIPEMD160.new()
        h.update(data)
        return h.hexdigest()
    
def encrypt_text(data,pub_im,mes_im=None):
    uniq=uuid.uuid4()
    pub_key = decode(pub_im)
    data = data.encode("utf-8")
    recipient_key = RSA.import_key(pub_key)
    session_key = get_random_bytes(16)
    cipher_rsa = PKCS1_OAEP.new(recipient_key)
    enc_session_key = cipher_rsa.encrypt(session_key)
    cipher_aes = AES.new(session_key, AES.MODE_EAX)
    ciphertext, tag = cipher_aes.encrypt_and_digest(data)
    file_out = open(f"{uniq}encrypted_data.bin", "wb")
    [ file_out.write(x) for x in (enc_session_key, cipher_aes.nonce, tag, ciphertext) ]
    file_out.close()
    doc_name = f"{uniq}encrypted_data.bin"
    with open(doc_name, "rb") as file:
        file_data =(file.read())
        #print (f'file_data::{file_data}')
    if mes_im == None:
        qr_link="test"
        #trans_im1.save("trans_im.png")
        hash_1 = calculate_hash(pub_key, hash_function="sha256")
        hash_2 = calculate_hash(hash_1, hash_function="ripemd160")
        address = base58.b58encode(hash_2)    
        add_label = str(address)
        add_label = add_label.strip("b").strip("'")  
        trans_im1=make_qr(txt=address, color_b="#ECFD08")
        message_im = textover(trans_im1, "Message",add_label)
        message_im.save(f"{uniq}private_key_im.png")
    else:
        im_mes=Image.open(mes_im)
        im_mes.save(f"{uniq}private_key_im.png")
    enc_qr = conv_im(f"{uniq}private_key_im.png",data=file_data)
    file.close()
    return str(file_data),enc_qr