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

diff --git a/ctypescrypto/engine.py b/ctypescrypto/engine.py
index 47f4878d72d9c542a5659002302d72375c46c5b5..c2858e6ebd5b459a1dceac7eac99dc7d5be3388e 100644 (file)
--- a/ctypescrypto/engine.py
+++ b/ctypescrypto/engine.py
@@ -1,27 +1,39 @@
-from ctypes import *
+"""
+engine loading and configuration
+"""
+from ctypes import c_void_p, c_char_p, c_int
 from ctypescrypto import libcrypto
 from ctypescrypto.exception import LibCryptoError
-default=None
+
+__all__ = ['default', 'set_default']
+
+default = None
 
 def set_default(engine):
-       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
+    """
+    Loads specified engine and sets it as default for all
+    algorithms, supported by it
+    """
+    global default
+    eng = libcrypto.ENGINE_by_id(engine)
+    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, 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)
+    libcrypto.ENGINE_set_default(eng, c_int(0xFFFF))
+    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_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, )