ctypescrypto/exception.py

   1 """
   2 Exception which extracts libcrypto error information
   3 """
   4 from ctypes import *
   5 from ctypescrypto import libcrypto
   6 strings_loaded=False
   7 class LibCryptoError(Exception):
   8         """
   9                 Exception for libcrypto errors. Adds all the info, which can be
  10                 extracted from internal (per-thread) libcrypto error stack to the message,
  11                 passed to the constructor.
  12         """
  13         def __init__(self,msg):
  14                 global strings_loaded
  15                 if not strings_loaded:
  16                         libcrypto.ERR_load_crypto_strings()
  17                         strings_loaded = True
  18                 e=libcrypto.ERR_get_error()
  19                 m = msg
  20                 while e != 0:
  21                         m+="\n\t"+libcrypto.ERR_lib_error_string(e)+":"+\
  22                           libcrypto.ERR_func_error_string(e)+":"+\
  23                           libcrypto.ERR_reason_error_string(e)
  24                         e=libcrypto.ERR_get_error()
  25                 self.args=(m,)
  26
  27 def clear_err_stack():
  28         """
  29           Clears internal libcrypto err stack. Call it if you've checked
  30           return code and processed exceptional situation, so subsequent
  31           raising of the LibCryptoError wouldn't list already handled errors
  32         """
  33         libcrypto.ERR_clear_error()
  34
  35
  36 libcrypto.ERR_lib_error_string.restype=c_char_p
  37 libcrypto.ERR_func_error_string.restype=c_char_p
  38 libcrypto.ERR_reason_error_string.restype=c_char_p