Initial commit of modules

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

diff --git a/ctypescrypto/engine.py b/ctypescrypto/engine.py
new file mode 100644 (file)
index 0000000..47f4878
--- /dev/null
+++ b/ctypescrypto/engine.py
@@ -0,0 +1,27 @@
+from ctypes import *
+from ctypescrypto import libcrypto
+from ctypescrypto.exception import LibCryptoError
+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
+
+# 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)