mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2024-11-26 03:13:45 +03:00
Dump libssl bindings in favour of the new optional cryptg module
This commit is contained in:
Lonami Exo
parent
c11aefa95b
commit
030f292203
|
|
@ -3,86 +3,90 @@ AES IGE implementation in Python. This module may use libssl if available.
|
|||
"""
|
||||
import os
|
||||
import pyaes
|
||||
from . import libssl
|
||||
|
||||
try:
|
||||
import cryptg
|
||||
except ImportError:
|
||||
cryptg = None
|
||||
|
||||
|
||||
if libssl.AES is not None:
|
||||
# Use libssl if available, since it will be faster
|
||||
AES = libssl.AES
|
||||
else:
|
||||
# Fallback to a pure Python implementation
|
||||
class AES:
|
||||
class AES:
|
||||
"""
|
||||
Class that servers as an interface to encrypt and decrypt
|
||||
text through the AES IGE mode.
|
||||
"""
|
||||
@staticmethod
|
||||
def decrypt_ige(cipher_text, key, iv):
|
||||
"""
|
||||
Class that servers as an interface to encrypt and decrypt
|
||||
text through the AES IGE mode.
|
||||
Decrypts the given text in 16-bytes blocks by using the
|
||||
given key and 32-bytes initialization vector.
|
||||
"""
|
||||
@staticmethod
|
||||
def decrypt_ige(cipher_text, key, iv):
|
||||
"""
|
||||
Decrypts the given text in 16-bytes blocks by using the
|
||||
given key and 32-bytes initialization vector.
|
||||
"""
|
||||
iv1 = iv[:len(iv) // 2]
|
||||
iv2 = iv[len(iv) // 2:]
|
||||
if cryptg:
|
||||
return cryptg.decrypt_ige(cipher_text, key, iv)
|
||||
|
||||
aes = pyaes.AES(key)
|
||||
iv1 = iv[:len(iv) // 2]
|
||||
iv2 = iv[len(iv) // 2:]
|
||||
|
||||
plain_text = []
|
||||
blocks_count = len(cipher_text) // 16
|
||||
aes = pyaes.AES(key)
|
||||
|
||||
cipher_text_block = [0] * 16
|
||||
for block_index in range(blocks_count):
|
||||
for i in range(16):
|
||||
cipher_text_block[i] = \
|
||||
cipher_text[block_index * 16 + i] ^ iv2[i]
|
||||
plain_text = []
|
||||
blocks_count = len(cipher_text) // 16
|
||||
|
||||
plain_text_block = aes.decrypt(cipher_text_block)
|
||||
cipher_text_block = [0] * 16
|
||||
for block_index in range(blocks_count):
|
||||
for i in range(16):
|
||||
cipher_text_block[i] = \
|
||||
cipher_text[block_index * 16 + i] ^ iv2[i]
|
||||
|
||||
for i in range(16):
|
||||
plain_text_block[i] ^= iv1[i]
|
||||
plain_text_block = aes.decrypt(cipher_text_block)
|
||||
|
||||
iv1 = cipher_text[block_index * 16:block_index * 16 + 16]
|
||||
iv2 = plain_text_block
|
||||
for i in range(16):
|
||||
plain_text_block[i] ^= iv1[i]
|
||||
|
||||
plain_text.extend(plain_text_block)
|
||||
iv1 = cipher_text[block_index * 16:block_index * 16 + 16]
|
||||
iv2 = plain_text_block
|
||||
|
||||
return bytes(plain_text)
|
||||
plain_text.extend(plain_text_block)
|
||||
|
||||
@staticmethod
|
||||
def encrypt_ige(plain_text, key, iv):
|
||||
"""
|
||||
Encrypts the given text in 16-bytes blocks by using the
|
||||
given key and 32-bytes initialization vector.
|
||||
"""
|
||||
return bytes(plain_text)
|
||||
|
||||
# Add random padding iff it's not evenly divisible by 16 already
|
||||
if len(plain_text) % 16 != 0:
|
||||
padding_count = 16 - len(plain_text) % 16
|
||||
plain_text += os.urandom(padding_count)
|
||||
@staticmethod
|
||||
def encrypt_ige(plain_text, key, iv):
|
||||
"""
|
||||
Encrypts the given text in 16-bytes blocks by using the
|
||||
given key and 32-bytes initialization vector.
|
||||
"""
|
||||
# Add random padding iff it's not evenly divisible by 16 already
|
||||
if len(plain_text) % 16 != 0:
|
||||
padding_count = 16 - len(plain_text) % 16
|
||||
plain_text += os.urandom(padding_count)
|
||||
|
||||
iv1 = iv[:len(iv) // 2]
|
||||
iv2 = iv[len(iv) // 2:]
|
||||
if cryptg:
|
||||
return cryptg.encrypt_ige(plain_text, key, iv)
|
||||
|
||||
aes = pyaes.AES(key)
|
||||
iv1 = iv[:len(iv) // 2]
|
||||
iv2 = iv[len(iv) // 2:]
|
||||
|
||||
cipher_text = []
|
||||
blocks_count = len(plain_text) // 16
|
||||
aes = pyaes.AES(key)
|
||||
|
||||
for block_index in range(blocks_count):
|
||||
plain_text_block = list(
|
||||
plain_text[block_index * 16:block_index * 16 + 16]
|
||||
)
|
||||
for i in range(16):
|
||||
plain_text_block[i] ^= iv1[i]
|
||||
cipher_text = []
|
||||
blocks_count = len(plain_text) // 16
|
||||
|
||||
cipher_text_block = aes.encrypt(plain_text_block)
|
||||
for block_index in range(blocks_count):
|
||||
plain_text_block = list(
|
||||
plain_text[block_index * 16:block_index * 16 + 16]
|
||||
)
|
||||
for i in range(16):
|
||||
plain_text_block[i] ^= iv1[i]
|
||||
|
||||
for i in range(16):
|
||||
cipher_text_block[i] ^= iv2[i]
|
||||
cipher_text_block = aes.encrypt(plain_text_block)
|
||||
|
||||
iv1 = cipher_text_block
|
||||
iv2 = plain_text[block_index * 16:block_index * 16 + 16]
|
||||
for i in range(16):
|
||||
cipher_text_block[i] ^= iv2[i]
|
||||
|
||||
cipher_text.extend(cipher_text_block)
|
||||
iv1 = cipher_text_block
|
||||
iv2 = plain_text[block_index * 16:block_index * 16 + 16]
|
||||
|
||||
return bytes(cipher_text)
|
||||
cipher_text.extend(cipher_text_block)
|
||||
|
||||
return bytes(cipher_text)
|
||||
|
|
|
|||
|
|
@ -1,107 +0,0 @@
|
|||
"""
|
||||
This module holds an AES IGE class, if libssl is available on the system.
|
||||
"""
|
||||
import os
|
||||
import ctypes
|
||||
from ctypes.util import find_library
|
||||
|
||||
lib = find_library('ssl')
|
||||
if not lib:
|
||||
AES = None
|
||||
else:
|
||||
""" <aes.h>
|
||||
# define AES_ENCRYPT 1
|
||||
# define AES_DECRYPT 0
|
||||
# define AES_MAXNR 14
|
||||
struct aes_key_st {
|
||||
# ifdef AES_LONG
|
||||
unsigned long rd_key[4 * (AES_MAXNR + 1)];
|
||||
# else
|
||||
unsigned int rd_key[4 * (AES_MAXNR + 1)];
|
||||
# endif
|
||||
int rounds;
|
||||
};
|
||||
typedef struct aes_key_st AES_KEY;
|
||||
|
||||
int AES_set_encrypt_key(const unsigned char *userKey, const int bits,
|
||||
AES_KEY *key);
|
||||
int AES_set_decrypt_key(const unsigned char *userKey, const int bits,
|
||||
AES_KEY *key);
|
||||
void AES_ige_encrypt(const unsigned char *in, unsigned char *out,
|
||||
size_t length, const AES_KEY *key,
|
||||
unsigned char *ivec, const int enc);
|
||||
"""
|
||||
_libssl = ctypes.cdll.LoadLibrary(lib)
|
||||
|
||||
AES_MAXNR = 14
|
||||
AES_ENCRYPT = ctypes.c_int(1)
|
||||
AES_DECRYPT = ctypes.c_int(0)
|
||||
|
||||
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),
|
||||
]
|
||||
|
||||
class AES:
|
||||
"""
|
||||
Class that servers as an interface to encrypt and decrypt
|
||||
text through the AES IGE mode, using the system's libssl.
|
||||
"""
|
||||
@staticmethod
|
||||
def decrypt_ige(cipher_text, key, iv):
|
||||
"""
|
||||
Decrypts the given text in 16-bytes blocks by using the
|
||||
given key and 32-bytes initialization vector.
|
||||
"""
|
||||
aeskey = AES_KEY()
|
||||
ckey = (ctypes.c_ubyte * len(key))(*key)
|
||||
cklen = ctypes.c_int(len(key)*8)
|
||||
cin = (ctypes.c_ubyte * len(cipher_text))(*cipher_text)
|
||||
ctlen = ctypes.c_size_t(len(cipher_text))
|
||||
cout = (ctypes.c_ubyte * len(cipher_text))()
|
||||
civ = (ctypes.c_ubyte * len(iv))(*iv)
|
||||
|
||||
_libssl.AES_set_decrypt_key(ckey, cklen, ctypes.byref(aeskey))
|
||||
_libssl.AES_ige_encrypt(
|
||||
ctypes.byref(cin),
|
||||
ctypes.byref(cout),
|
||||
ctlen,
|
||||
ctypes.byref(aeskey),
|
||||
ctypes.byref(civ),
|
||||
AES_DECRYPT
|
||||
)
|
||||
|
||||
return bytes(cout)
|
||||
|
||||
@staticmethod
|
||||
def encrypt_ige(plain_text, key, iv):
|
||||
"""
|
||||
Encrypts the given text in 16-bytes blocks by using the
|
||||
given key and 32-bytes initialization vector.
|
||||
"""
|
||||
# Add random padding iff it's not evenly divisible by 16 already
|
||||
if len(plain_text) % 16 != 0:
|
||||
padding_count = 16 - len(plain_text) % 16
|
||||
plain_text += os.urandom(padding_count)
|
||||
|
||||
aeskey = AES_KEY()
|
||||
ckey = (ctypes.c_ubyte * len(key))(*key)
|
||||
cklen = ctypes.c_int(len(key)*8)
|
||||
cin = (ctypes.c_ubyte * len(plain_text))(*plain_text)
|
||||
ctlen = ctypes.c_size_t(len(plain_text))
|
||||
cout = (ctypes.c_ubyte * len(plain_text))()
|
||||
civ = (ctypes.c_ubyte * len(iv))(*iv)
|
||||
|
||||
_libssl.AES_set_encrypt_key(ckey, cklen, ctypes.byref(aeskey))
|
||||
_libssl.AES_ige_encrypt(
|
||||
ctypes.byref(cin),
|
||||
ctypes.byref(cout),
|
||||
ctlen,
|
||||
ctypes.byref(aeskey),
|
||||
ctypes.byref(civ),
|
||||
AES_ENCRYPT
|
||||
)
|
||||
|
||||
return bytes(cout)
|
||||
Loading…
Reference in New Issue
Block a user