mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2024-11-27 03:43:45 +03:00
70 lines
2.0 KiB
Python
70 lines
2.0 KiB
Python
|
"""
|
||
|
|
Helper module around the system's libssl library if available for IGE mode.
|
||
|
|
"""
|
||
|
|
import ctypes
|
||
|
|
import ctypes.util
|
||
|
|
|
||
|
|
|
||
|
|
lib = ctypes.util.find_library('ssl')
|
||
|
|
if not lib:
|
||
|
|
decrypt_ige = None
|
||
|
|
encrypt_ige = None
|
||
|
|
else:
|
||
|
|
_libssl = ctypes.cdll.LoadLibrary(lib)
|
||
|
|
|
||
|
|
# https://github.com/openssl/openssl/blob/master/include/openssl/aes.h
|
||
|
|
AES_ENCRYPT = ctypes.c_int(1)
|
||
|
|
AES_DECRYPT = ctypes.c_int(0)
|
||
|
|
AES_MAXNR = 14
|
||
|
|
|
||
|
|
class AES_KEY(ctypes.Structure):
|
||
|
|
"""Helper class representing an AES key"""
|
||
|
|
_fields_ = [
|
||
|
|
('rd_key', ctypes.c_uint32 * (4 * (AES_MAXNR + 1))),
|
||
|
|
('rounds', ctypes.c_uint),
|
||
|
|
]
|
||
|
|
|
||
|
|
def decrypt_ige(cipher_text, key, iv):
|
||
|
|
aes_key = AES_KEY()
|
||
|
|
key_len = ctypes.c_int(8 * len(key))
|
||
|
|
key = (ctypes.c_ubyte * len(key))(*key)
|
||
|
|
iv = (ctypes.c_ubyte * len(iv))(*iv)
|
||
|
|
|
||
|
|
in_len = ctypes.c_size_t(len(cipher_text))
|
||
|
|
in_ptr = (ctypes.c_ubyte * len(cipher_text))(*cipher_text)
|
||
|
|
out_ptr = (ctypes.c_ubyte * len(cipher_text))()
|
||
|
|
|
||
|
|
_libssl.AES_set_decrypt_key(key, key_len, ctypes.byref(aes_key))
|
||
|
|
_libssl.AES_ige_encrypt(
|
||
|
|
ctypes.byref(in_ptr),
|
||
|
|
ctypes.byref(out_ptr),
|
||
|
|
in_len,
|
||
|
|
ctypes.byref(aes_key),
|
||
|
|
ctypes.byref(iv),
|
||
|
|
AES_DECRYPT
|
||
|
|
)
|
||
|
|
|
||
|
|
return bytes(out_ptr)
|
||
|
|
|
||
|
|
def encrypt_ige(plain_text, key, iv):
|
||
|
|
aes_key = AES_KEY()
|
||
|
|
key_len = ctypes.c_int(8 * len(key))
|
||
|
|
key = (ctypes.c_ubyte * len(key))(*key)
|
||
|
|
iv = (ctypes.c_ubyte * len(iv))(*iv)
|
||
|
|
|
||
|
|
in_len = ctypes.c_size_t(len(plain_text))
|
||
|
|
in_ptr = (ctypes.c_ubyte * len(plain_text))(*plain_text)
|
||
|
|
out_ptr = (ctypes.c_ubyte * len(plain_text))()
|
||
|
|
|
||
|
|
_libssl.AES_set_encrypt_key(key, key_len, ctypes.byref(aes_key))
|
||
|
|
_libssl.AES_ige_encrypt(
|
||
|
|
ctypes.byref(in_ptr),
|
||
|
|
ctypes.byref(out_ptr),
|
||
|
|
in_len,
|
||
|
|
ctypes.byref(aes_key),
|
||
|
|
ctypes.byref(iv),
|
||
|
|
AES_ENCRYPT
|
||
|
|
)
|
||
|
|
|
||
|
|
return bytes(out_ptr)
|