--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libpurple/protocols/gg/oauth/oauth.c	Mon Aug 06 13:16:32 2012 +0200
@@ -0,0 +1,139 @@
+/*
+ *  (C) Copyright 2008 Wojtek Kaniewski <wojtekka@irc.pl>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License Version
+ *  2.1 as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
+ *  USA.
+ */
+
+// source: http://toxygen.net/libgadu/
+
+#include "oauth.h"
+
+#include "oauth-parameter.h"
+#include <cipher.h>
+
+char *gg_oauth_static_nonce;		/* dla unit testów */
+char *gg_oauth_static_timestamp;	/* dla unit testów */
+
+static void gg_oauth_generate_nonce(char *buf, int len)
+{
+	const char charset[] = "0123456789";
+
+	if (buf == NULL || len < 1)
+		return;
+
+	while (len > 1) {
+		*buf++ = charset[(unsigned) (((float) sizeof(charset) - 1.0) * rand() / (RAND_MAX + 1.0))];
+		len--;
+	}
+
+	*buf = 0;
+}
+
+static gchar *gg_hmac_sha1(const char *key, const char *message)
+{
+	PurpleCipherContext *context;
+	guchar digest[20];
+	
+	context = purple_cipher_context_new_by_name("hmac", NULL);
+	purple_cipher_context_set_option(context, "hash", "sha1");
+	purple_cipher_context_set_key(context, (guchar *)key);
+	purple_cipher_context_append(context, (guchar *)message, strlen(message));
+	purple_cipher_context_digest(context, sizeof(digest), digest, NULL);
+	purple_cipher_context_destroy(context);
+	
+	return purple_base64_encode(digest, sizeof(digest));
+}
+
+static char *gg_oauth_generate_signature(const char *method, const char *url, const char *request, const char *consumer_secret, const char *token_secret)
+{
+	char *text, *key, *res;
+	gchar *url_e, *request_e, *consumer_secret_e, *token_secret_e;
+
+	url_e = g_uri_escape_string(url, NULL, FALSE);
+	request_e = g_uri_escape_string(request, NULL, FALSE);
+	text = g_strdup_printf("%s&%s&%s", method, url_e, request_e);
+	g_free(url_e);
+	g_free(request_e);
+
+	consumer_secret_e = g_uri_escape_string(consumer_secret, NULL, FALSE);
+	token_secret_e = g_uri_escape_string(token_secret, NULL, FALSE);
+	key = g_strdup_printf("%s&%s", consumer_secret, token_secret ? token_secret : "");
+	g_free(consumer_secret_e);
+	g_free(token_secret_e);
+
+	res = gg_hmac_sha1(key, text);
+
+	free(key);
+	free(text);
+
+	return res;
+}
+
+char *gg_oauth_generate_header(const char *method, const char *url, const const char *consumer_key, const char *consumer_secret, const char *token, const char *token_secret)
+{
+	char *request, *signature, *res;
+	char nonce[80], timestamp[16];
+	gg_oauth_parameter_t *params = NULL;
+
+	if (gg_oauth_static_nonce == NULL)
+		gg_oauth_generate_nonce(nonce, sizeof(nonce));
+	else {
+		strncpy(nonce, gg_oauth_static_nonce, sizeof(nonce) - 1);
+		nonce[sizeof(nonce) - 1] = 0;
+	}
+
+	if (gg_oauth_static_timestamp == NULL)
+		snprintf(timestamp, sizeof(timestamp), "%ld", time(NULL));
+	else {
+		strncpy(timestamp, gg_oauth_static_timestamp, sizeof(timestamp) - 1);
+		timestamp[sizeof(timestamp) - 1] = 0;
+	}
+
+	gg_oauth_parameter_set(&params, "oauth_consumer_key", consumer_key);
+	gg_oauth_parameter_set(&params, "oauth_nonce", nonce);
+	gg_oauth_parameter_set(&params, "oauth_signature_method", "HMAC-SHA1");
+	gg_oauth_parameter_set(&params, "oauth_timestamp", timestamp);
+	gg_oauth_parameter_set(&params, "oauth_token", token);
+	gg_oauth_parameter_set(&params, "oauth_version", "1.0");
+
+	request = gg_oauth_parameter_join(params, 0);
+
+	signature = gg_oauth_generate_signature(method, url, request, consumer_secret, token_secret);
+
+	free(request);
+
+	gg_oauth_parameter_free(params);
+	params = NULL;
+
+	if (signature == NULL)
+		return NULL;
+
+	gg_oauth_parameter_set(&params, "oauth_version", "1.0");
+	gg_oauth_parameter_set(&params, "oauth_nonce", nonce);
+	gg_oauth_parameter_set(&params, "oauth_timestamp", timestamp);
+	gg_oauth_parameter_set(&params, "oauth_consumer_key", consumer_key);
+	gg_oauth_parameter_set(&params, "oauth_token", token);
+	gg_oauth_parameter_set(&params, "oauth_signature_method", "HMAC-SHA1");
+	gg_oauth_parameter_set(&params, "oauth_signature", signature);
+
+	free(signature);
+
+	res = gg_oauth_parameter_join(params, 1);
+
+	gg_oauth_parameter_free(params);
+
+	return res;
+}
+