forked from r4sas/PBinCLI
R4SAS
7 years ago
4 changed files with 15 additions and 93 deletions
@ -1,88 +0,0 @@
@@ -1,88 +0,0 @@
|
||||
import os |
||||
from base64 import b64decode, b64encode |
||||
|
||||
from cryptography.hazmat.primitives import hashes |
||||
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes |
||||
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC |
||||
from cryptography.hazmat.backends import default_backend |
||||
|
||||
|
||||
_BACKEND = default_backend() |
||||
|
||||
|
||||
def decrypt(pwd, json): |
||||
iv = b64decode(json['iv']) |
||||
ct = b64decode(json['ct']) |
||||
salt = b64decode(json['salt']) |
||||
ts = json['ts'] / 8 |
||||
|
||||
tag_start = len(ct) - ts |
||||
tag = ct[tag_start:] |
||||
ciphertext = ct[:tag_start] |
||||
|
||||
mode_class = getattr(modes, json['mode'].upper()) |
||||
algo_class = getattr(algorithms, json['cipher'].upper()) |
||||
|
||||
kdf = _kdf(json['ks'], iters=json['iter'], salt=salt)[0] |
||||
key = kdf.derive(pwd) |
||||
cipher = Cipher(algo_class(key), |
||||
mode_class(iv, tag, min_tag_length=ts), |
||||
backend=_BACKEND) |
||||
|
||||
dec = cipher.decryptor() |
||||
result = dec.update(ciphertext) + dec.finalize() |
||||
return result |
||||
|
||||
|
||||
def encrypt(pwd, plaintext, salt_in=None, mode='gcm', algorithm='aes', |
||||
keysize=256, tagsize=128, iters=10000): |
||||
ts = tagsize / 8 |
||||
|
||||
mode_class = getattr(modes, mode.upper()) |
||||
algo_class = getattr(algorithms, algorithm.upper()) |
||||
|
||||
iv = os.urandom(16) |
||||
kdf, salt = _kdf(keysize, iters, salt_in) |
||||
key = kdf.derive(pwd) |
||||
cipher = Cipher(algo_class(key), |
||||
mode_class(iv, min_tag_length=ts), |
||||
backend=_BACKEND) |
||||
|
||||
enc = cipher.encryptor() |
||||
ciphertext = enc.update(plaintext) + enc.finalize() |
||||
|
||||
json = { |
||||
"v": 1, |
||||
"iv": b64encode(iv), |
||||
"salt": b64encode(salt), |
||||
"ct": b64encode(ciphertext + enc.tag[:ts]), |
||||
"iter": iters, |
||||
"ks": keysize, |
||||
"ts": tagsize, |
||||
"mode": mode, |
||||
"cipher": algorithm, |
||||
"adata": "" |
||||
} |
||||
return json |
||||
|
||||
|
||||
def _kdf(keysize=256, iters=10000, salt=None, **kwargs): |
||||
kdf_salt = salt or os.urandom(8) |
||||
kdf = PBKDF2HMAC(algorithm=hashes.SHA256(), |
||||
length=keysize / 8, |
||||
salt=kdf_salt, |
||||
iterations=iters, |
||||
backend=_BACKEND) |
||||
|
||||
return kdf, kdf_salt |
||||
|
||||
|
||||
if __name__ == "__main__": |
||||
import json |
||||
|
||||
blob = '{"iv":"/6dKRRAOZ60oyumLMQsBtg==","v":1,"iter":256000,"ks":128,"ts":64,"mode":"gcm","adata":"","cipher":"aes","salt":"s8+LFcBmbcc=","ct":"wTapp5CWmD6SFA=="}' |
||||
data = json.loads(blob) |
||||
result = decrypt('pwd', data) |
||||
assert result == "hi" |
||||
|
||||
print(decrypt('pwd', encrypt('pwd', result, tagsize=64))) |
Loading…
Reference in new issue