From 25db9ff8a4cfb4b98aeeaae360e8c718b9c5e20c Mon Sep 17 00:00:00 2001
From: Dennis Brentjes <d.brentjes@gmail.com>
Date: Thu, 27 Oct 2016 09:25:53 +0200
Subject: Adds libgcrypt implementation for elgamal in multiplicative group.

Also adapts the API to both handle sodium and gcrypt libraries.
---
 node/node.cpp | 53 +++++++++++++++++++++++++----------------------------
 1 file changed, 25 insertions(+), 28 deletions(-)

(limited to 'node/node.cpp')

diff --git a/node/node.cpp b/node/node.cpp
index 2dfbba8..857d5af 100644
--- a/node/node.cpp
+++ b/node/node.cpp
@@ -31,7 +31,7 @@ Node::Node(ListenSettings const& listen_settings, NodeNetworkSettings network_se
 }
 
 Node::~Node() {
-	api.free_key_pair(keypair);
+	api.free_key_pair(&keypair);
 }
 
 void Node::run() {
@@ -68,46 +68,35 @@ void Node::connect_to_next_node()
 
 void Node::start_initialisation() {
 	cmix_proto::Initialization init;
-	init.set_public_share(keypair.pub, keypair.pub_len);
 	
+	char* pub_key;
+	size_t len;
+	api.get_key_array(&pub_key, &len, keypair.pub);
+	init.set_public_share(pub_key, len);
+	free(pub_key);
+	
+	BOOST_LOG_TRIVIAL(trace) << "Sending intialization as first node";
 	next_node.async_send(init);
 }
 
 void Node::handle_node_initialization(const cmix_proto::Initialization& init)
 {
-	if(init.public_share().size() != keypair.pub_len) {
-		prev_node.close();
-		cmix_proto::Bye bye;
-		next_node.async_send(bye, [this]{io_service.stop();});
-		BOOST_LOG_TRIVIAL(fatal) << "Previous node dit not send proper initialization message.";
-		return;
-	}
-
 	if(network_settings.is_first) {
 		cmix_proto::SecretKey sec;
 		sec.set_secret_key(network_key.data(), network_key.size());
 		next_node.async_send(sec);
 	} else {
 	
-		Bignum shared = allocate_bignum(init.public_share().size());
-		std::copy_n(init.public_share().data(), init.public_share().size(), shared.data);
-		Bignum my_share = allocate_bignum(keypair.pub_len);
-		std::copy_n(my_share.data, my_share.len, keypair.pub);
-		Bignum mod = allocate_bignum(keypair.pub_len);
-		get_curve25519_mod(&mod);
-		Bignum new_shared = allocate_bignum(keypair.pub_len);
-		
-		calculate_shared_key_part(&new_shared, shared, my_share, mod);
+		char* buffer;
+		size_t len;
+		api.add_public_share(&buffer, &len, init.public_share().c_str(), init.public_share().size(), keypair.pub);
 		
 		cmix_proto::Initialization init;
-		init.set_public_share(new_shared.data, new_shared.len);
+		init.set_public_share(buffer, len);
+		free(buffer);
 		
+		BOOST_LOG_TRIVIAL(trace) << "Sending intialization";
 		next_node.async_send(init);
-	
-		free_bignum(&shared);
-		free_bignum(&my_share);
-		free_bignum(&mod);
-		free_bignum(&new_shared);
 	}
 }
 
@@ -154,7 +143,14 @@ void Node::handle_client_keyexchange(ClientConnections::key_type handle, cmix_pr
 	data[handle].shared_value = api.derive_shared_key(keypair, reinterpret_cast<uint8_t const*>(ke.public_key().c_str()), true);
 	
 	cmix_proto::KeyExchange exchange;
-	exchange.set_public_key(keypair.pub, keypair.pub_len);
+	
+	char* buffer;
+	size_t len;
+	api.get_key_array(&buffer, &len, keypair.pub);
+	
+	exchange.set_public_key(buffer, len);
+	free(buffer);
+	
 	clients.at(handle).async_send(exchange);
 }
 
@@ -188,7 +184,7 @@ void Node::handle_client_message(ClientConnections::key_type handle, cmix_proto:
 
 void Node::handle_imanode(Purgatory::iterator handle) {
 	handle->on_done([]{});
-	prev_node = SSLReceiver(std::move(*handle));
+	prev_node = std::move(*handle);
 	purgatory.erase(handle);
 	
 	if(network_settings.is_first) {
@@ -204,11 +200,12 @@ void Node::handle_imanode(Purgatory::iterator handle) {
 
 void Node::handle_imaclient(Purgatory::iterator handle, cmix_proto::ImAClient c) {
 	std::string client_id = c.id();
-	clients.emplace(c.id(), SSLSenderReceiver(std::move(*handle)));
+	clients.emplace(c.id(), std::move(*handle));
 	clients.at(c.id()).on_done([this, client_id]{
 		clients.erase(client_id);
 	});
 	purgatory.erase(handle);
+	clients.at(c.id()).async_send(cmix_proto::NodeReady());
 	clients.at(c.id()).async_receive([this, client_id](cmix_proto::CMixMessage message) {
 		handle_client_message(client_id, message);
 	});
-- 
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