2 Exception which extracts libcrypto error information
4 from ctypes import c_ulong, c_char_p, create_string_buffer
5 from ctypescrypto import libcrypto, strings_loaded
7 __all__ = ['LibCryptoError', 'clear_err_stack']
9 class LibCryptoError(Exception):
11 Exception for libcrypto errors. Adds all the info, which can be
12 extracted from internal (per-thread) libcrypto error stack to the message,
13 passed to the constructor.
15 def __init__(self, msg):
17 if not strings_loaded:
18 libcrypto.ERR_load_crypto_strings()
20 err_code = libcrypto.ERR_get_error()
22 buf = create_string_buffer(128)
24 mesg += "\n\t" + libcrypto.ERR_error_string(err_code, buf)
25 err_code = libcrypto.ERR_get_error()
26 super(LibCryptoError, self).__init__(mesg)
28 def clear_err_stack():
30 Clears internal libcrypto err stack. Call it if you've checked
31 return code and processed exceptional situation, so subsequent
32 raising of the LibCryptoError wouldn't list already handled errors
34 libcrypto.ERR_clear_error()
36 libcrypto.ERR_get_error.restype = c_ulong
37 libcrypto.ERR_error_string.restype = c_char_p
38 libcrypto.ERR_error_string.argtypes = (c_ulong, c_char_p)