mirror of
https://github.com/borgbackup/borg.git
synced 2024-12-24 16:55:36 +00:00
55 lines
1.9 KiB
Python
55 lines
1.9 KiB
Python
from ctypes import cdll, c_char_p, c_int, c_uint, c_void_p, POINTER, create_string_buffer
|
|
from ctypes.util import find_library
|
|
import struct
|
|
|
|
libcrypto = cdll.LoadLibrary(find_library('crypto'))
|
|
libcrypto.PKCS5_PBKDF2_HMAC.argtypes = (c_char_p, c_int, c_char_p, c_int, c_int, c_void_p, c_int, c_char_p)
|
|
libcrypto.EVP_sha256.restype = c_void_p
|
|
libcrypto.AES_set_encrypt_key.argtypes = (c_char_p, c_int, c_char_p)
|
|
libcrypto.AES_ctr128_encrypt.argtypes = (c_char_p, c_char_p, c_int, c_char_p, c_char_p, c_char_p, POINTER(c_uint))
|
|
|
|
_int = struct.Struct('>I')
|
|
_long = struct.Struct('>Q')
|
|
|
|
bytes_to_int = lambda x, offset=0: _int.unpack_from(x, offset)[0]
|
|
bytes_to_long = lambda x, offset=0: _long.unpack_from(x, offset)[0]
|
|
long_to_bytes = lambda x: _long.pack(x)
|
|
|
|
|
|
def pbkdf2_sha256(password, salt, iterations, size):
|
|
key = create_string_buffer(size)
|
|
rv = libcrypto.PKCS5_PBKDF2_HMAC(password, len(password), salt, len(salt), iterations, libcrypto.EVP_sha256(), size, key)
|
|
if not rv:
|
|
raise Exception('PKCS5_PBKDF2_HMAC failed')
|
|
return key.raw
|
|
|
|
|
|
def get_random_bytes(n):
|
|
"""Return n cryptographically strong pseudo-random bytes
|
|
"""
|
|
buf = create_string_buffer(n)
|
|
if not libcrypto.RAND_bytes(buf, n):
|
|
raise Exception('RAND_bytes failed')
|
|
return buf.raw
|
|
|
|
|
|
class AES:
|
|
def __init__(self, key, iv=None):
|
|
self.key = create_string_buffer(2000)
|
|
self.iv = create_string_buffer(16)
|
|
self.buf = create_string_buffer(16)
|
|
self.num = c_uint()
|
|
self.reset(key, iv)
|
|
|
|
def reset(self, key=None, iv=None):
|
|
if key:
|
|
libcrypto.AES_set_encrypt_key(key, len(key) * 8, self.key)
|
|
if iv:
|
|
self.iv.raw = iv
|
|
self.num.value = 0
|
|
|
|
def encrypt(self, data):
|
|
out = create_string_buffer(len(data))
|
|
libcrypto.AES_ctr128_encrypt(data, out, len(data), self.key, self.iv, self.buf, self.num)
|
|
return out.raw
|
|
decrypt = encrypt
|