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# vim: sts=4 sw=4 et
"""
M2Crypto wrapper for OpenSSL ENGINE API.
Pavel Shramov
IMEC MSU
"""
from M2Crypto import m2, EVP, X509, Err
class EngineError(Exception): pass
m2.engine_init_error(EngineError)
class Engine:
"""Wrapper for ENGINE object."""
m2_engine_free = m2.engine_free
def __init__(self, id = None, _ptr = None, _pyfree = 1):
"""Create new Engine from ENGINE pointer or obtain by id"""
if not _ptr and not id:
raise ValueError("No engine id specified")
self._ptr = _ptr
if not self._ptr:
self._ptr = m2.engine_by_id(id)
if not self._ptr:
raise ValueError("Unknown engine: %s" % id)
self._pyfree = _pyfree
def __del__(self):
if getattr(self, '_pyfree', 0):
self.m2_engine_free(self._ptr)
def init(self):
"""Obtain a functional reference to the engine.
@return: 0 on error, non-zero on success."""
return m2.engine_init(self._ptr)
def finish(self):
"""Release a functional and structural reference to the engine."""
return m2.engine_finish(self._ptr)
def ctrl_cmd_string(self, cmd, arg, optional = 0):
"""Call ENGINE_ctrl_cmd_string"""
if not m2.engine_ctrl_cmd_string(self._ptr, cmd, arg, optional):
raise EngineError(Err.get_error())
def get_name(self):
"""Return engine name"""
return m2.engine_get_name(self._ptr)
def get_id(self):
"""Return engine id"""
return m2.engine_get_id(self._ptr)
def set_default(self, methods = m2.ENGINE_METHOD_ALL):
"""Use this engine as default for methods specified in argument
Possible values are bitwise OR of m2.ENGINE_METHOD_*"""
return m2.engine_set_default(self._ptr, methods)
def _engine_load_key(self, func, name, pin = None):
"""Helper function for loading keys"""
ui = m2.ui_openssl()
cbd = m2.engine_pkcs11_data_new(pin)
try:
kptr = func(self._ptr, name, ui, cbd)
if not kptr:
raise EngineError(Err.get_error())
key = EVP.PKey(kptr, _pyfree = 1)
finally:
m2.engine_pkcs11_data_free(cbd)
return key
def load_private_key(self, name, pin = None):
"""Load private key with engine methods (e.g from smartcard).
If pin is not set it will be asked
"""
return self._engine_load_key(m2.engine_load_private_key, name, pin)
def load_public_key(self, name, pin = None):
"""Load public key with engine methods (e.g from smartcard)."""
return self._engine_load_key(m2.engine_load_public_key, name, pin)
def load_certificate(self, name):
"""Load certificate from engine (e.g from smartcard).
NOTE: This function may be not implemented by engine!"""
cptr = m2.engine_load_certificate(self._ptr, name)
if not cptr:
raise EngineError("Certificate or card not found")
return X509.X509(cptr, _pyfree = 1)
def load_dynamic_engine(id, sopath):
"""Load and return dymanic engine from sopath and assign id to it"""
m2.engine_load_dynamic()
e = Engine('dynamic')
e.ctrl_cmd_string("SO_PATH", sopath)
e.ctrl_cmd_string("ID", id)
e.ctrl_cmd_string("LIST_ADD", "1")
e.ctrl_cmd_string("LOAD", None)
return e
def load_dynamic():
"""Load dynamic engine"""
m2.engine_load_dynamic()
def load_openssl():
"""Load openssl engine"""
m2.engine_load_openssl()
def cleanup():
"""If you load any engines, you need to clean up after your application
is finished with the engines."""
m2.engine_cleanup()