Begin to implement python3 support. Now tests for oid, bio, cipher, digest, mac and...

[oss/ctypescrypto.git] / ctypescrypto / engine.py

diff --git a/ctypescrypto/engine.py b/ctypescrypto/engine.py
index 0446d48c2649426fef33ba16ca10b19ae6b0c7d0..1de33d5897e50202db7b4924fcd080448fc756a2 100644 (file)
--- a/ctypescrypto/engine.py
+++ b/ctypescrypto/engine.py
@@ -1,38 +1,77 @@
 """
 engine loading and configuration
 """
-from ctypes import *
-from ctypescrypto import libcrypto
+from ctypes import c_void_p, c_char_p, c_int
+from ctypescrypto import libcrypto,pyver
 from ctypescrypto.exception import LibCryptoError
 
-__all__=['default','set_default']
+__all__ = ['default', 'set_default', 'Engine']
 
-default=None
+default = None
 
-def set_default(engine):
+class Engine(object):
     """
-        Loads specified engine and sets it as default for all 
-        algorithms, supported by it
+    Represents Openssl loadable module (engine).
+    Allows to create PKey objects from private keys stored
+    in the token, accessed by engine
     """
+    def __init__(self, engine_id, **kwargs):
+        if pyver > 2 or isinstance(engine_id, unicode):
+            engine_id = engine_id.encode('utf-8')
+        eng = libcrypto.ENGINE_by_id(engine_id)
+        if eng is None:
+            # Try load engine
+            eng = libcrypto.ENGINE_by_id("dynamic")
+            if  eng is None:
+                raise LibCryptoError("Cannot get 'dynamic' engine")
+            if not libcrypto.ENGINE_ctrl_cmd_string(eng, "SO_PATH",
+                                                    engine_id, 0):
+                raise LibCryptoError("Cannot execute ctrl cmd SO_PATH")
+            if not libcrypto.ENGINE_ctrl_cmd_string(eng, "LOAD", None, 0):
+                raise LibCryptoError("Cannot execute ctrl cmd LOAD")
+        if eng is None:
+            raise ValueError("Cannot find engine " + engine)
+        for cmd, value in kwargs.items():
+            if not libcrypto.ENGINE_ctrl_cmd_string(eng, cmd, value, 0):
+                raise LibCryptoError("Cannot execute ctrl cmd %s" % cmd)
+        if not libcrypto.ENGINE_init(eng):
+            raise LibCryptoError("Cannot initialize engine")
+        self.ptr = eng
+
+    def private_key(self, key_id, ui_method = None, ui_data=None):
+        from ctypescrypto.pkey import PKey
+        if ui_method is None:
+            ui_ptr = libcrypto.UI_OpenSSL()
+        else:
+            ui_ptr = ui_method.ptr
+        pkey = libcrypto.ENGINE_load_private_key(self.ptr, key_id, ui_ptr,
+                                                 ui_data)
+        if pkey is None:
+            raise LibCryptoError("Cannot load private key")
+        return PKey(ptr=pkey, cansign=True)
+
+def set_default(eng, algorithms=0xFFFF):
+    """
+    Sets specified engine  as default for all
+    algorithms, supported by it
+
+    For compatibility with 0.2.x if string is passed instead
+    of engine, attempts to load engine with this id
+    """
+    if not isinstance(eng,Engine):
+        eng=Engine(eng)
     global default
-    e=libcrypto.ENGINE_by_id(engine)
-    if e is None:
-        # Try load engine
-        e = libcrypto.ENGINE_by_id("dynamic")
-        if  e is None:
-            raise LibCryptoError("Cannot get 'dynamic' engine")
-        if not libcrypto.ENGINE_ctrl_cmd_string(e,"SO_PATH",engine,0):
-            raise LibCryptoError("Cannot execute ctrl cmd SO_PATH")
-        if not libcrypto.ENGINE_ctrl_cmd_string(e,"LOAD",None,0):
-            raise LibCryptoError("Cannot execute ctrl cmd LOAD")
-    if e is None:
-        raise ValueError("Cannot find engine "+engine)
-    libcrypto.ENGINE_set_default(e,c_int(0xFFFF))
-    default=e
+    libcrypto.ENGINE_set_default(eng.ptr, c_int(algorithms))
+    default = eng
 
 # Declare function result and arguments for used functions
-libcrypto.ENGINE_by_id.restype=c_void_p
-libcrypto.ENGINE_by_id.argtypes=(c_char_p,)
-libcrypto.ENGINE_set_default.argtypes=(c_void_p,c_int)
-libcrypto.ENGINE_ctrl_cmd_string.argtypes=(c_void_p,c_char_p,c_char_p,c_int)
-libcrypto.ENGINE_finish.argtypes=(c_char_p,)
+libcrypto.ENGINE_by_id.restype = c_void_p
+libcrypto.ENGINE_by_id.argtypes = (c_char_p, )
+libcrypto.ENGINE_set_default.argtypes = (c_void_p, c_int)
+libcrypto.ENGINE_ctrl_cmd_string.argtypes = (c_void_p, c_char_p, c_char_p,
+                                             c_int)
+libcrypto.ENGINE_finish.argtypes = (c_char_p, )
+libcrypto.ENGINE_init.argtypes = (c_void_p, )
+libcrypto.UI_OpenSSL.restype = c_void_p
+libcrypto.ENGINE_load_private_key.argtypes = (c_void_p, c_char_p, c_void_p, c_void_p)
+libcrypto.ENGINE_load_private_key.restype = c_void_p