crypt.py

import gradio as gr
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
from Crypto.Signature import pkcs1_15
import binascii

import base58
import stegan
import stegan2
import qr
import overlay


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 generate_keys():
    secret_code="SECRET PASSWORD"
    key = RSA.generate(2048)
    #private_key = key.export_key('PEM')
    private_key = key.export_key(passphrase=secret_code, pkcs=8,
                          protection="scryptAndAES128-CBC")
    print(f'private_key:: {private_key}')
    
    file_out_priv = open("private.pem", "wb")
    file_out_priv.write(private_key)
    file_out_priv.close()
    
    public_key = key.publickey().export_key('PEM')
    file_out_pub = open("receiver.pem", "wb")
    file_out_pub.write(public_key)
    file_out_pub.close()


    hash_1 = calculate_hash(public_key, hash_function="sha256")
    hash_2 = calculate_hash(hash_1, hash_function="ripemd160")
    address = base58.b58encode(hash_2)
    address_im=qr.make_qr(txt=address)
    add_label = str(address)
    add_label = add_label.strip("b").strip("'")
    address_im = overlay.textover(address_im, "Wallet",add_label)
    address_im.save("address_im.png")
    #qr_link="test"
    address_im = "address_im.png"
    private_key_im = overlay.textover("private_key.png", "Key",add_label)
    private_key_im.save("private_key_im.png")
    priv_key = stegan.conv_im("private_key_im.png",data=private_key)
    
    pub_key = stegan.conv_im("address_im.png",data=public_key)   
    
    return public_key,private_key,address_im,address,priv_key,pub_key

def sign(data,in2):
    priv_key = stegan2.decode(in2)
    print(f'priv_key:: {priv_key}')
    private_key = RSA.import_key(priv_key)    

    hash_object = SHA256.new(data)
    signature = pkcs1_15.new(private_key).sign(hash_object)
    signature = binascii.hexlify(signature).decode("utf-8")
    data_json = {
        "data": data,
        "signature": signature
    }
    return data_json

def validate_signature(public_key: bytes, signature: bytes, transaction_data: bytes):
    public_key_object = RSA.import_key(public_key)
    transaction_hash = SHA256.new(transaction_data)
    pkcs1_15.new(public_key_object).verify(transaction_hash, signature)
    
def encrypt_text(data,pub_im,priv_im,address):
    pub_key = stegan2.decode(pub_im)
    #priv_key = stegan2.decode(in2)
    #print(f'priv_key:: {priv_key}')
    #private_key = RSA.import_key(priv_key)    
    data = data.encode("utf-8")
    #data = sign(data,priv_im)
    
    
    recipient_key = RSA.import_key(pub_key)

    session_key = get_random_bytes(16)
    
    # Encrypt the session key with the public RSA key
    cipher_rsa = PKCS1_OAEP.new(recipient_key)
    enc_session_key = cipher_rsa.encrypt(session_key)
    
    # Encrypt the data with the AES session key
    cipher_aes = AES.new(session_key, AES.MODE_EAX)
    ciphertext, tag = cipher_aes.encrypt_and_digest(data)

    file_out = open("encrypted_data.bin", "wb")
    
    [ file_out.write(x) for x in (enc_session_key, cipher_aes.nonce, tag, ciphertext) ]
    file_out.close()
    doc_name = "encrypted_data.bin"
    with open(doc_name, "rb") as file:
        file_data =(file.read())
        print (f'file_data::{file_data}')
    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=qr.make_qr(txt=address, color_b="#ECFD08")

    #address_im = "address_im.png"
    private_key_im = overlay.textover(trans_im1, "Transaction",add_label)
    private_key_im.save("private_key_im.png")



    
    #trans_im1.save("trans_im.png")
    enc_qr = stegan.conv_im("private_key_im.png",data=file_data)
    
    file.close()
    return str(file_data),enc_qr

def decrypt_text(im,in2):
    enc_in = stegan2.decode(im)
    secret_code="SECRET PASSWORD"
    #private_key = RSA.import_key(open("private.pem").read())
    priv_key = stegan2.decode(in2)
    print(f'priv_key:: {priv_key}')
    private_key = RSA.import_key(priv_key,passphrase=secret_code)
    print(f'private_key:: {private_key}')
    enc_session_key = enc_in[:private_key.size_in_bytes()]
    end1 = private_key.size_in_bytes()+16
    nonce = enc_in[private_key.size_in_bytes():end1]
    start1=end1+1
    end2 = private_key.size_in_bytes()+32
    start2=end2+1
    tag = enc_in[end1:end2]
    ciphertext = enc_in[end2:]
    print (f'enc_session_key::{enc_session_key}')
    print (f'nonce::{nonce}')
    print (f'tag::{tag}')
    print (f'ciphertext::{ciphertext}')    

    # Decrypt the session key with the private RSA key
    cipher_rsa = PKCS1_OAEP.new(private_key)
    session_key = cipher_rsa.decrypt(enc_session_key)
    
    # Decrypt the data with the AES session key
    cipher_aes = AES.new(session_key, AES.MODE_EAX, nonce)
    data = cipher_aes.decrypt_and_verify(ciphertext, tag)
    
    #public_key = private_key.publickey().export_key('PEM')
    #data_val = data[0]
    #print (data_val)
    
    #signature = data[1]
    #print (signature)
    #transaction_hash = SHA256.new(data)

    #transaction
    
    #print (pkcs1_15.new(public_key).verify(transaction_hash, signature))
    return(data.decode("utf-8"))

def test_fn(im1,im2):
    return im1,im2,im1
def test_fn2(im1):
    return im1