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59 lines
2.1 KiB
Python
59 lines
2.1 KiB
Python
import sys
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from ctypes import cdll, c_char_p, c_int, c_uint, c_void_p, POINTER, create_string_buffer
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from ctypes.util import find_library
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import struct
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libcrypto = cdll.LoadLibrary(find_library('crypto'))
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# Default libcrypto on OS X is too old, try the brew version
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if not hasattr(libcrypto, 'PKCS5_PBKDF2_HMAC') and sys.platform == 'darwin':
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libcrypto = cdll.LoadLibrary('/usr/local/opt/openssl/lib/libcrypto.dylib')
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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)
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libcrypto.EVP_sha256.restype = c_void_p
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libcrypto.AES_set_encrypt_key.argtypes = (c_char_p, c_int, c_char_p)
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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))
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_int = struct.Struct('>I')
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_long = struct.Struct('>Q')
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bytes_to_int = lambda x, offset=0: _int.unpack_from(x, offset)[0]
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bytes_to_long = lambda x, offset=0: _long.unpack_from(x, offset)[0]
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long_to_bytes = lambda x: _long.pack(x)
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def pbkdf2_sha256(password, salt, iterations, size):
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key = create_string_buffer(size)
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rv = libcrypto.PKCS5_PBKDF2_HMAC(password, len(password), salt, len(salt), iterations, libcrypto.EVP_sha256(), size, key)
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if not rv:
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raise Exception('PKCS5_PBKDF2_HMAC failed')
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return key.raw
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def get_random_bytes(n):
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"""Return n cryptographically strong pseudo-random bytes
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"""
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buf = create_string_buffer(n)
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if not libcrypto.RAND_bytes(buf, n):
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raise Exception('RAND_bytes failed')
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return buf.raw
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class AES:
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def __init__(self, key, iv=None):
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self.key = create_string_buffer(2000)
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self.iv = create_string_buffer(16)
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self.buf = create_string_buffer(16)
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self.num = c_uint()
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self.reset(key, iv)
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def reset(self, key=None, iv=None):
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if key:
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libcrypto.AES_set_encrypt_key(key, len(key) * 8, self.key)
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if iv:
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self.iv.raw = iv
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self.num.value = 0
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def encrypt(self, data):
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out = create_string_buffer(len(data))
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libcrypto.AES_ctr128_encrypt(data, out, len(data), self.key, self.iv, self.buf, self.num)
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return out.raw
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decrypt = encrypt
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