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Original file line number | Diff line number | Diff line change |
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import pyaes | ||
from cryptography.hazmat.primitives import padding | ||
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes | ||
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def _pad(data: bytes) -> bytes: | ||
if len(data) % 16 == 0: | ||
return data | ||
padder = padding.PKCS7(128).padder() | ||
return padder.update(data) + padder.finalize() | ||
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def _unpad(data: bytes) -> bytes: | ||
try: | ||
unpadder = padding.PKCS7(128).unpadder() | ||
return unpadder.update(data) + unpadder.finalize() | ||
except ValueError: | ||
return data | ||
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def aes_cbc_encrypt(key: bytes, data: bytes, iv: bytes) -> bytes: | ||
encrypter = pyaes.Encrypter( | ||
pyaes.AESModeOfOperationCBC(key, iv=iv)) | ||
enc_data = encrypter.feed(data) | ||
enc_data += encrypter.feed() | ||
return enc_data | ||
encrypter = Cipher(algorithms.AES(key), modes.CBC(iv)).encryptor() | ||
return encrypter.update(_pad(data)) + encrypter.finalize() | ||
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def aes_cbc_decrypt(key: bytes, data: bytes, iv: bytes) -> bytes: | ||
decrypter = pyaes.Decrypter( | ||
pyaes.AESModeOfOperationCBC(key, iv=iv)) | ||
dec_data = decrypter.feed(data) | ||
dec_data += decrypter.feed() | ||
return dec_data | ||
decrypter = Cipher(algorithms.AES(key), modes.CBC(iv)).decryptor() | ||
return _unpad(decrypter.update(data) + decrypter.finalize()) |
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Original file line number | Diff line number | Diff line change |
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#! /usr/bin/env python | ||
import os | ||
from binascii import unhexlify | ||
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import pytest | ||
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from jmbase import crypto | ||
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@pytest.mark.parametrize("data", [b"a secret message", b"joinmarket"]) | ||
def test_aes_cbc(data): | ||
key, iv = os.urandom(32), os.urandom(16) | ||
encrypted = crypto.aes_cbc_encrypt(key, data, iv) | ||
assert crypto.aes_cbc_decrypt(key, encrypted, iv) == data | ||
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@pytest.mark.parametrize( | ||
"key, iv, ciphertext, plaintext", | ||
[ | ||
( | ||
"2b7e151628aed2a6abf7158809cf4f3c", | ||
"000102030405060708090a0b0c0d0e0f", | ||
"7649abac8119b246cee98e9b12e9197d5086cb9b507219ee95db113a917678b273bed6b8e3c1743b7116e69e222295163ff1caa1681fac09120eca307586e1a7", | ||
"6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52eff69f2445df4f9b17ad2b417be66c3710", | ||
), | ||
( | ||
"8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b", | ||
"000102030405060708090a0b0c0d0e0f", | ||
"4f021db243bc633d7178183a9fa071e8b4d9ada9ad7dedf4e5e738763f69145a571b242012fb7ae07fa9baac3df102e008b0e27988598881d920a9e64f5615cd", | ||
"6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52eff69f2445df4f9b17ad2b417be66c3710", | ||
), | ||
( | ||
"603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4", | ||
"000102030405060708090a0b0c0d0e0f", | ||
"f58c4c04d6e5f1ba779eabfb5f7bfbd69cfc4e967edb808d679f777bc6702c7d39f23369a9d9bacfa530e26304231461b2eb05e2c39be9fcda6c19078c6a9d1b", | ||
"6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52eff69f2445df4f9b17ad2b417be66c3710", | ||
), | ||
], | ||
) | ||
def test_aes_cbc(key, iv, ciphertext, plaintext): | ||
_key = unhexlify(key) | ||
_iv = unhexlify(iv) | ||
ct = unhexlify(ciphertext) | ||
pt = unhexlify(plaintext) | ||
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assert crypto.aes_cbc_encrypt(_key, pt, _iv) == ct | ||
assert crypto.aes_cbc_decrypt(_key, ct, _iv) == pt |
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