70 lines
2.0 KiB
Python
70 lines
2.0 KiB
Python
# coding: utf-8
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"""
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ctypes interface for BN_mod_inverse() function from OpenSSL. Exports the
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following items:
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- libcrypto
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- BN_bn2bin()
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- BN_CTX_free()
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- BN_CTX_new()
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- BN_free()
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- BN_mod_inverse()
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- BN_new()
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- BN_num_bits()
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- BN_set_negative()
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Will raise asn1crypto._ffi.LibraryNotFoundError() if libcrypto can not be
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found. Will raise asn1crypto._ffi.FFIEngineError() if there is an error
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interfacing with libcrypto.
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"""
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from __future__ import unicode_literals, division, absolute_import, print_function
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import sys
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from ctypes import CDLL, c_int, c_char_p, c_void_p
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from ctypes.util import find_library
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from .._ffi import LibraryNotFoundError, FFIEngineError
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try:
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# On Python 2, the unicode string here may raise a UnicodeDecodeError as it
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# tries to join a bytestring path to the unicode name "crypto"
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libcrypto_path = find_library(b'crypto' if sys.version_info < (3,) else 'crypto')
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if not libcrypto_path:
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raise LibraryNotFoundError('The library libcrypto could not be found')
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libcrypto = CDLL(libcrypto_path)
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libcrypto.BN_new.argtypes = []
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libcrypto.BN_new.restype = c_void_p
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libcrypto.BN_bin2bn.argtypes = [c_char_p, c_int, c_void_p]
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libcrypto.BN_bin2bn.restype = c_void_p
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libcrypto.BN_bn2bin.argtypes = [c_void_p, c_char_p]
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libcrypto.BN_bn2bin.restype = c_int
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libcrypto.BN_set_negative.argtypes = [c_void_p, c_int]
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libcrypto.BN_set_negative.restype = None
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libcrypto.BN_num_bits.argtypes = [c_void_p]
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libcrypto.BN_num_bits.restype = c_int
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libcrypto.BN_free.argtypes = [c_void_p]
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libcrypto.BN_free.restype = None
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libcrypto.BN_CTX_new.argtypes = []
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libcrypto.BN_CTX_new.restype = c_void_p
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libcrypto.BN_CTX_free.argtypes = [c_void_p]
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libcrypto.BN_CTX_free.restype = None
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libcrypto.BN_mod_inverse.argtypes = [c_void_p, c_void_p, c_void_p, c_void_p]
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libcrypto.BN_mod_inverse.restype = c_void_p
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except (AttributeError):
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raise FFIEngineError('Error initializing ctypes')
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