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authorMatthias Schiffer <mschiffer@universe-factory.net>2013-10-31 05:59:13 +0100
committerMatthias Schiffer <mschiffer@universe-factory.net>2013-10-31 05:59:13 +0100
commit66a953a83f162ed5e096d75a5ddf4e2a80ea15b3 (patch)
tree0413fd234f6f65c238117556c7512badc2cf527e /src/protocols/ec25519_fhmqvc
parentf6c37dc0eac486f409f56e3de49a58a7bb5a9195 (diff)
downloadfastd-66a953a83f162ed5e096d75a5ddf4e2a80ea15b3.tar
fastd-66a953a83f162ed5e096d75a5ddf4e2a80ea15b3.zip
ec25519-fhmqvc: generate compat keys only when needed
Diffstat (limited to 'src/protocols/ec25519_fhmqvc')
-rw-r--r--src/protocols/ec25519_fhmqvc/handshake.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/src/protocols/ec25519_fhmqvc/handshake.c b/src/protocols/ec25519_fhmqvc/handshake.c
index b908875..e377985 100644
--- a/src/protocols/ec25519_fhmqvc/handshake.c
+++ b/src/protocols/ec25519_fhmqvc/handshake.c
@@ -198,6 +198,8 @@ static bool update_shared_handshake_key(fastd_context_t *ctx, const fastd_peer_t
return true;
}
+ bool compat = !ctx->conf->secure_handshakes;
+
if (!make_shared_handshake_key(ctx, &handshake_key->key.secret, false,
&peer->protocol_config->public_key,
&ctx->conf->protocol_config->key.public,
@@ -205,7 +207,7 @@ static bool update_shared_handshake_key(fastd_context_t *ctx, const fastd_peer_t
&handshake_key->key.public,
&peer->protocol_state->sigma,
&peer->protocol_state->shared_handshake_key,
- &peer->protocol_state->shared_handshake_key_compat))
+ compat ? &peer->protocol_state->shared_handshake_key_compat : NULL))
return false;
peer->protocol_state->last_handshake_serial = handshake_key->serial;
@@ -255,6 +257,8 @@ static void finish_handshake(fastd_context_t *ctx, fastd_socket_t *sock, const f
const fastd_handshake_t *handshake, const char *method) {
pr_debug(ctx, "finishing handshake with %P[%I]...", peer, remote_addr);
+ bool compat = !secure_handshake(handshake);
+
aligned_int256_t sigma;
fastd_sha256_t shared_handshake_key, shared_handshake_key_compat;
if (!make_shared_handshake_key(ctx, &handshake_key->key.secret, true,
@@ -263,12 +267,12 @@ static void finish_handshake(fastd_context_t *ctx, fastd_socket_t *sock, const f
&handshake_key->key.public,
peer_handshake_key,
&sigma,
- &shared_handshake_key,
- &shared_handshake_key_compat))
+ compat ? NULL : &shared_handshake_key,
+ compat ? &shared_handshake_key_compat : NULL))
return;
bool valid;
- if (secure_handshake(handshake)) {
+ if (!compat) {
uint8_t mac[HASHBYTES];
memcpy(mac, handshake->records[RECORD_TLV_MAC].data, HASHBYTES);
memset(handshake->records[RECORD_TLV_MAC].data, 0, HASHBYTES);
@@ -295,7 +299,7 @@ static void finish_handshake(fastd_context_t *ctx, fastd_socket_t *sock, const f
fastd_handshake_add(ctx, &buffer, RECORD_SENDER_HANDSHAKE_KEY, PUBLICKEYBYTES, handshake_key->key.public.p);
fastd_handshake_add(ctx, &buffer, RECORD_RECEIPIENT_HANDSHAKE_KEY, PUBLICKEYBYTES, peer_handshake_key->p);
- if (secure_handshake(handshake)) {
+ if (!compat) {
fastd_sha256_t hmacbuf;
uint8_t *mac = fastd_handshake_add_zero(ctx, &buffer, RECORD_TLV_MAC, HASHBYTES);
fastd_hmacsha256(&hmacbuf, shared_handshake_key.w, fastd_handshake_tlv_data(&buffer), fastd_handshake_tlv_len(&buffer));
@@ -315,11 +319,13 @@ static void handle_finish_handshake(fastd_context_t *ctx, fastd_socket_t *sock,
const fastd_handshake_t *handshake, const char *method) {
pr_debug(ctx, "handling handshake finish with %P[%I]...", peer, remote_addr);
+ bool compat = !secure_handshake(handshake);
+
if (!update_shared_handshake_key(ctx, peer, handshake_key, peer_handshake_key))
return;
bool valid;
- if (secure_handshake(handshake)) {
+ if (!compat) {
uint8_t mac[HASHBYTES];
memcpy(mac, handshake->records[RECORD_TLV_MAC].data, HASHBYTES);
memset(handshake->records[RECORD_TLV_MAC].data, 0, HASHBYTES);