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encrypt.py
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encrypt.py
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import time
import sys
import numpy as np
from Crypto.Cipher import AES
from Crypto.Random import get_random_bytes
from Crypto.Util.Padding import pad, unpad
import xml.etree.ElementTree as ET
from PIL import Image
import io
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import padding
import random
import binascii
from phe import paillier
import tenseal as ts
class TenSealEnc():
def __init__(self, kappa):
self.context = None
self.kappa = kappa
def encrypt(self, X):
# encrypted vectors
enc1 = ts.ckks_vector(self.context, X)
#enc2 = ts.ckks_vector(self.context, Y)
return enc1
def decrypt(self, enc1):
decry = enc1.decrypt()
return decry
def generate_keys(self):
if self.kappa ==512:
self.context = ts.context(ts.SCHEME_TYPE.CKKS, poly_modulus_degree=8192,
coeff_mod_bit_sizes=[60, 40, 40, 60])
if self.kappa == 1024:
self.context = ts.context(ts.SCHEME_TYPE.CKKS, poly_modulus_degree=16384,
coeff_mod_bit_sizes=[60, 40, 40, 60, 60, 40, 40, 60])
if self.kappa == 2048:
self.context = ts.context(ts.SCHEME_TYPE.CKKS, poly_modulus_degree=32768,
coeff_mod_bit_sizes=[60, 40, 40, 60, 60, 40, 40, 60, 60, 40, 40, 60])
if self.kappa == 4096:
self.context = ts.context(ts.SCHEME_TYPE.CKKS, poly_modulus_degree=65536,
coeff_mod_bit_sizes=[60, 40, 40, 60, 60, 40, 40, 60, 60, 40, 40, 60, 60, 40, 40, 60])
self.context.generate_galois_keys()
self.context.global_scale = 2 ** 40
class RSA:
def __init__(self):
self.sk = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
backend=default_backend()
)
self.pk = self.sk.public_key()
def sign_digest(self, digest):
signature = self.sk.sign(
digest,
padding=padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.MAX_LENGTH
),
algorithm=hashes.SHA256()
)
return signature
def verify_digest_signature(self, digest, signature):
try:
self.pk.verify(
signature,
digest,
padding=padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.MAX_LENGTH
),
algorithm=hashes.SHA256()
)
return True
except Exception:
return False
def sign_image(self, image_data):
hasher = hashes.Hash(hashes.SHA256(), backend=default_backend())
hasher.update(image_data)
hash_value = hasher.finalize()
signature = self.sk.sign(
hash_value,
padding=padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.MAX_LENGTH
),
algorithm=hashes.SHA256()
)
return signature
def verify_image_signature(self, image_data, signature):
hasher = hashes.Hash(hashes.SHA256(), backend=default_backend())
hasher.update(image_data)
hash_value = hasher.finalize()
try:
self.pk.verify(
signature,
hash_value,
padding=padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.MAX_LENGTH
),
algorithm=hashes.SHA256()
)
return True
except Exception:
return False
def sign_text(self, text):
text_bytes = text.encode('utf-8')
hasher = hashes.Hash(hashes.SHA256(), backend=default_backend())
hasher.update(text_bytes)
hash_value = hasher.finalize()
signature = self.sk.sign(
hash_value,
padding=padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.MAX_LENGTH
),
algorithm=hashes.SHA256()
)
return signature
def verify_text_signature(self, text, signature):
text_bytes = text.encode('utf-8')
hasher = hashes.Hash(hashes.SHA256(), backend=default_backend())
hasher.update(text_bytes)
hash_value = hasher.finalize()
try:
self.pk.verify(
signature,
hash_value,
padding=padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.MAX_LENGTH
),
algorithm=hashes.SHA256()
)
return True
except Exception:
return False
class AESEncrypt:
def __init__(self):
seed = 1
random.seed(seed)
self.Ks = bytes([random.randint(0, 255) for _ in range(16)])
def aes_encrypt(self,data):
cipher = AES.new(self.Ks, AES.MODE_ECB)
#ciphertext = cipher.encrypt(pad(data, AES.block_size))
ciphertext = cipher.encrypt(pad(data, AES.block_size))
return ciphertext
def encrypt(self, img_path=None, img_output_path=None, txt_path=None, txt_output_path=None):
if img_path is not None:
with open(img_path, 'rb') as file:
image_data = file.read()
ciphertext = self.aes_encrypt(image_data)
with open(img_output_path, 'wb') as file:
file.write(ciphertext)
if txt_path is not None:
xml_text = []
with open(txt_path, "r", encoding="utf-8") as file:
xml_text = file.read()
xml_text = xml_text.replace("&", "&")
tree = ET.ElementTree(ET.fromstring(xml_text))
root = tree.getroot()
text_data = None
for item in root.findall('.//text'):
text_data = item.text
text_data = text_data[1:-1]
ciphertext2 = self.aes_encrypt(text_data.encode('utf-8'))
with open(txt_output_path, 'wb') as file:
file.write(ciphertext2)
return True
def aes_decrypt(self, ciphertext):
cipher = AES.new(self.Ks, AES.MODE_ECB)
decrypted_data = unpad(cipher.decrypt(ciphertext), AES.block_size)
return decrypted_data
def decrypt(self, img_path=None, img_output_path=None, txt_path=None, txt_output_path=None):
if img_path is not None:
with open(img_path, 'rb') as file:
ciphertext = file.read()
decrypted_data = self.aes_decrypt(ciphertext)
with open(img_output_path, 'wb') as file:
file.write(decrypted_data)
if txt_path is not None:
with open(txt_path, 'rb') as file:
ciphertext2 = file.read()
decrypted_data2 = self.aes_decrypt(ciphertext2).decode('utf-8')
with open(txt_output_path, 'w', encoding='utf-8') as file:
file.write(decrypted_data2)
return True
if __name__ == '__main__':
public_key, private_key = paillier.generate_paillier_keypair(n_length=2048)
X = np.random.randint(0, 100, 100)
enc = 0
dec = 0
for x in X:
time1 = time.time()
encX = public_key.encrypt(int(x))
enc += time.time() - time1
time2 = time.time()
decX = private_key.decrypt(encX)
dec += time.time() - time2
print("enc:{}".format(enc/100))
print("dec:{}".format(dec / 100))