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Improve libssl.py's file formatting

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Lonami Exo 2017-08-20 01:27:04 +02:00
parent 274e16ac66
commit 88ec9c297e
2 changed files with 75 additions and 69 deletions
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2
telethon/crypto/aes.py
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@ -3,7 +3,7 @@ import pyaes
from . import libssl from . import libssl
if libssl.libssl: if libssl.AES is not None:
# Use libssl if available, since it will be faster # Use libssl if available, since it will be faster
AES = libssl.AES AES = libssl.AES
else: else:

142
telethon/crypto/libssl.py
View File

@ -2,84 +2,90 @@ import os
import ctypes import ctypes
from ctypes.util import find_library from ctypes.util import find_library
# search and load libssl.so
lib = find_library('ssl') lib = find_library('ssl')
if not lib: if not lib:
libssl = None AES = None
else: else:
libssl = ctypes.cdll.LoadLibrary(lib) """ <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;
""" <aes.h> int AES_set_encrypt_key(const unsigned char *userKey, const int bits,
# define AES_ENCRYPT 1 AES_KEY *key);
# define AES_DECRYPT 0 int AES_set_decrypt_key(const unsigned char *userKey, const int bits,
# define AES_MAXNR 14 AES_KEY *key);
struct aes_key_st { void AES_ige_encrypt(const unsigned char *in, unsigned char *out,
# ifdef AES_LONG size_t length, const AES_KEY *key,
unsigned long rd_key[4 * (AES_MAXNR + 1)]; unsigned char *ivec, const int enc);
# else """
unsigned int rd_key[4 * (AES_MAXNR + 1)]; _libssl = ctypes.cdll.LoadLibrary(lib)
# endif
int rounds;
};
typedef struct aes_key_st AES_KEY;
int AES_set_encrypt_key(const unsigned char *userKey, const int bits, AES_MAXNR = 14
AES_KEY *key); AES_ENCRYPT = ctypes.c_int(1)
int AES_set_decrypt_key(const unsigned char *userKey, const int bits, AES_DECRYPT = ctypes.c_int(0)
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);
"""
AES_MAXNR = 14 class AES_KEY(ctypes.Structure):
AES_ENCRYPT = ctypes.c_int(1) _fields_ = [
AES_DECRYPT = ctypes.c_int(0) ('rd_key', ctypes.c_uint32 * (4*(AES_MAXNR + 1))),
('rounds', ctypes.c_uint),
]
class AES_KEY(ctypes.Structure): class AES:
_fields_ = [ @staticmethod
('rd_key', ctypes.c_uint32 * (4*(AES_MAXNR + 1))), def decrypt_ige(cipher_text, key, iv):
('rounds', ctypes.c_uint), 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)
class AES: _libssl.AES_set_decrypt_key(ckey, cklen, ctypes.byref(aeskey))
@staticmethod _libssl.AES_ige_encrypt(
def decrypt_ige(cipher_text, key, iv): ctypes.byref(cin),
ctypes.byref(cout),
ctlen,
ctypes.byref(aeskey),
ctypes.byref(civ),
AES_DECRYPT
)
# declare types return bytes(cout)
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)
# decrypt @staticmethod
libssl.AES_set_decrypt_key(ckey, cklen, ctypes.byref(aeskey)) def encrypt_ige(plain_text, key, iv):
libssl.AES_ige_encrypt(ctypes.byref(cin), ctypes.byref(cout), ctlen, ctypes.byref(aeskey), ctypes.byref(civ), AES_DECRYPT) # 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)
return bytes(cout) 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)
@staticmethod _libssl.AES_set_encrypt_key(ckey, cklen, ctypes.byref(aeskey))
def encrypt_ige(plain_text, key, iv): _libssl.AES_ige_encrypt(
ctypes.byref(cin),
ctypes.byref(cout),
ctlen,
ctypes.byref(aeskey),
ctypes.byref(civ),
AES_ENCRYPT
)
# Add random padding if and only if it's not evenly divisible by 16 already return bytes(cout)
if len(plain_text) % 16 != 0:
padding_count = 16 - len(plain_text) % 16
plain_text += os.urandom(padding_count)
# declare types
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)
# encrypt
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)