dssenh: Add CPSetKeyParam() stub implementation.

dlls/dssenh/dssenh.spec

@@ -19,7 +19,7 @@
 @ stdcall CPImportKey(ptr ptr long ptr long ptr)
 @ stdcall CPReleaseContext(ptr long)
 @ stdcall CPSetHashParam(ptr ptr long ptr long)
-@ stub CPSetKeyParam
+@ stdcall CPSetKeyParam(ptr ptr long ptr long)
 @ stub CPSetProvParam
 @ stdcall CPSignHash(ptr ptr long wstr long ptr ptr)
 @ stdcall CPVerifySignature(ptr ptr ptr long ptr wstr long)

dlls/dssenh/main.c

@@ -749,6 +749,17 @@ BOOL WINAPI CPGetUserKey( HCRYPTPROV hprov, DWORD keyspec, HCRYPTKEY *ret_key )
     return ret;
 }
 
+BOOL WINAPI CPSetKeyParam( HCRYPTPROV hprov, HCRYPTKEY hkey, DWORD param, BYTE *data, DWORD flags )
+{
+    if (!data)
+    {
+        SetLastError( ERROR_INVALID_PARAMETER );
+        return FALSE;
+    }
+
+    return FALSE;
+}
+
 BOOL WINAPI CPGenRandom( HCRYPTPROV hprov, DWORD len, BYTE *buffer )
 {
     struct container *container = (struct container *)hprov;