Created
July 18, 2019 00:04
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# coding=utf-8 | |
""" | |
SJCL utilities for the bots various functions | |
using code from <https://github.com/r4sas/PBinCLI/blob/master/pbincli/actions.py>, | |
© 2017–2018 R4SAS <r4sas@i2pmail.org> | |
using code from <https://github.com/khazhyk/dango.py/blob/master/dango/zerobin.py>, | |
© 2017 khazhyk | |
modified by https://github.com/bmintz | |
© 2018 bmintz | |
modified by https://github.com/EJH2 | |
© 2019 EJH2 | |
""" | |
import base64 | |
import hashlib | |
import os | |
import zlib | |
from sjcl import SJCL | |
def encrypt(text: str, password: str = None): | |
""" | |
Supplies encrypted text for the payload. | |
""" | |
key = base64.urlsafe_b64encode(os.urandom(32)) | |
if password: | |
digest = hashlib.sha256(password.encode()).hexdigest() | |
passphrase = key + digest.encode() | |
else: | |
passphrase = key | |
# Encrypting text | |
encrypted_data = SJCL().encrypt(_compress(text.encode()), passphrase, mode='gcm') | |
return encrypted_data, key | |
def decrypt(encrypted_data: dict, key: bytes, password: str = None): | |
""" | |
Supplies decrypted text from the payload. | |
""" | |
if password: | |
digest = hashlib.sha256(password.encode()).hexdigest() | |
passphrase = key + digest.encode() | |
else: | |
passphrase = key | |
# Decrypting text | |
data = _decompress(SJCL().decrypt(encrypted_data, passphrase).decode()) | |
return data | |
def _compress(s: bytes): | |
""" | |
Compresses bytes for the payload. | |
""" | |
co = zlib.compressobj(wbits=-zlib.MAX_WBITS) | |
b = co.compress(s) + co.flush() | |
return base64.b64encode(''.join(map(chr, b)).encode()) | |
def _decompress(s: str): | |
""" | |
Decompresses bytes returned from the payload. | |
""" | |
return zlib.decompress(bytearray(map(ord, base64.b64decode(s.encode()).decode('utf-8'))), -zlib.MAX_WBITS).decode() |
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