fixed derive for GOST2001

diff --git a/ctypescrypto/pkey.py b/ctypescrypto/pkey.py
index c9d252a0d31be6a105357381f3c217081ca9e175..56e8746ecb919201bf5fcdde568c91f3225c24e7 100644 (file)
--- a/ctypescrypto/pkey.py
+++ b/ctypescrypto/pkey.py
@@ -131,20 +131,20 @@ class PKey(object):
                        raise PKeyError("derive_init")
 
                
-               self._configure_context(self,ctx,kwargs,["ukm"])
+               self._configure_context(ctx,kwargs,["ukm"])
                if libcrypto.EVP_PKEY_derive_set_peer(ctx,peerkey.key)<=0:
                        raise PKeyError("Cannot set peer key")
-               if ukm in kwargs:
-                        if libcrypto.EVP_PKEY_CTX_ctrl(ctx,-1,1<<10,8,0,kwargs[ukm])<=0:
+               if "ukm" in kwargs:
+                        if libcrypto.EVP_PKEY_CTX_ctrl(ctx,-1,1<<10,8,8,kwargs["ukm"])<=0:
                                raise PKeyError("Cannot set UKM")
                keylen=c_long(0)
                if libcrypto.EVP_PKEY_derive(ctx,None,byref(keylen))<=0:
                        raise PKeyError("computing shared key length")
-               buf=create_string_buffer(keylen)
+               buf=create_string_buffer(keylen.value)
                if libcrypto.EVP_PKEY_derive(ctx,buf,byref(keylen))<=0:
                        raise PKeyError("computing actual shared key")
                libcrypto.EVP_PKEY_CTX_free(ctx)
-               return buf.raw[:keylen]
+               return buf.raw[:keylen.value]
        @staticmethod
        def generate(algorithm,**kwargs):
                """