+#define ASSOCIATE_RESPONSE_SIZE 4096
+
+/*
+ * libcurl callback function for prepare_openid_associate_request()
+ */
+size_t associate_callback(void *ptr, size_t size, size_t nmemb, void *stream)
+{
+ char *response = (char *) stream;
+ int got_bytes = (size * nmemb);
+ int len = strlen(response);
+
+ if ((len + got_bytes + 1) < ASSOCIATE_RESPONSE_SIZE) {
+ memcpy(&response[len], ptr, got_bytes);
+ response[len+got_bytes] = 0;
+ }
+
+ return got_bytes;
+}
+
+
+/*
+ * Process the response from an "associate" request
+ */
+void process_associate_response(associate_response)
+{
+ // FIXME finish this
+}
+
+
+
+/*
+ * Establish a shared secret with an OpenID Identity Provider by sending
+ * an "associate" request.
+ */
+void prepare_openid_associate_request(char *openid_server, char *openid_delegate)
+{
+ CURL *curl;
+ CURLcode res;
+ struct curl_httppost *formpost=NULL;
+ struct curl_httppost *lastptr=NULL;
+ char associate_response[ASSOCIATE_RESPONSE_SIZE];
+
+ memset(associate_response, 0, ASSOCIATE_RESPONSE_SIZE);
+
+ curl_formadd(&formpost,
+ &lastptr,
+ CURLFORM_COPYNAME, "openid.mode",
+ CURLFORM_COPYCONTENTS, "associate",
+ CURLFORM_END
+ );
+
+ curl_formadd(&formpost,
+ &lastptr,
+ CURLFORM_COPYNAME, "openid.session_type",
+ CURLFORM_COPYCONTENTS, "",
+ CURLFORM_END
+ );
+
+ curl = curl_easy_init();
+ if (curl) {
+ curl_easy_setopt(curl, CURLOPT_URL, openid_server);
+ curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
+ curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
+ curl_easy_setopt(curl, CURLOPT_WRITEDATA, associate_response);
+ curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, associate_callback);
+ curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
+
+ curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
+ res = curl_easy_perform(curl);
+ process_associate_response(associate_response);
+ curl_easy_cleanup(curl);
+ }
+ curl_formfree(formpost);
+}
+
+
+