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Always kiss your friends <3 + add it in the nonce

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Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>
This commit is contained in:
Adrien Gallouët
2018-03-06 16:00:12 +00:00
parent b809bf0785
commit cd4ad61d1c
1 changed files with 18 additions and 8 deletions
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26
mud.c
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@@ -83,7 +83,7 @@ struct mud_crypto_opt {
const unsigned char *data;
size_t size;
} src, ad;
unsigned char npub[16];
unsigned char npub[MUD_U48_SIZE + MUD_KISS_SIZE];
};
struct mud_crypto_key {
@@ -109,11 +109,11 @@ struct mud_packet {
struct {
unsigned char zero[MUD_U48_SIZE];
unsigned char time[MUD_U48_SIZE];
unsigned char kiss[MUD_KISS_SIZE];
unsigned char code;
} hdr;
union {
struct {
unsigned char kiss[MUD_KISS_SIZE];
unsigned char state;
struct mud_public public;
unsigned char aes;
@@ -148,7 +148,9 @@ struct mud {
int set;
struct sockaddr_storage addr;
} peer;
unsigned char kiss[MUD_KISS_SIZE];
struct {
unsigned char kiss[MUD_KISS_SIZE];
} remote, local;
};
static int
@@ -797,7 +799,7 @@ mud_create(struct sockaddr *addr)
mud->time_tolerance = MUD_TIME_TOLERANCE;
mud->tc = MUD_PACKET_TC;
randombytes_buf(mud->kiss, sizeof(mud->kiss));
randombytes_buf(mud->local.kiss, sizeof(mud->local.kiss));
return mud;
}
@@ -849,6 +851,7 @@ mud_encrypt(struct mud *mud, uint64_t nonce,
};
mud_write48(opt.npub, nonce);
memcpy(&opt.npub[MUD_U48_SIZE], mud->local.kiss, sizeof(mud->local.kiss));
memcpy(dst, opt.npub, MUD_U48_SIZE);
if (mud->crypto.use_next) {
@@ -883,6 +886,7 @@ mud_decrypt(struct mud *mud,
};
memcpy(opt.npub, src, MUD_U48_SIZE);
memcpy(&opt.npub[MUD_U48_SIZE], mud->remote.kiss, sizeof(mud->remote.kiss));
if (mud_decrypt_opt(&mud->crypto.current, &opt)) {
if (!mud_decrypt_opt(&mud->crypto.next, &opt)) {
@@ -949,12 +953,12 @@ mud_packet_send(struct mud *mud, enum mud_packet_code code,
memset(data, 0, sizeof(data));
mud_write48(packet->hdr.time, now);
memcpy(packet->hdr.kiss, mud->local.kiss, sizeof(mud->local.kiss));
packet->hdr.code = (unsigned char)code;
switch (code) {
case mud_conf:
size = sizeof(packet->data.conf);
memcpy(&packet->data.conf.kiss, &mud->kiss, size);
packet->data.conf.state = (unsigned char)path->state;
memcpy(&packet->data.conf.public.local, &mud->crypto.public.local,
sizeof(mud->crypto.public.local));
@@ -1039,11 +1043,18 @@ mud_packet_recv(struct mud *mud, struct mud_path *path,
{
struct mud_packet *packet = (struct mud_packet *)data;
memcpy(path->conf.kiss, packet->hdr.kiss,
sizeof(path->conf.kiss));
memcpy(mud->remote.kiss, packet->hdr.kiss,
sizeof(path->conf.kiss));
if (!mud->peer.set)
mud_kiss_path(mud, mud->remote.kiss);
switch (packet->hdr.code) {
case mud_conf:
path->conf.remote = 1;
memcpy(path->conf.kiss, packet->data.conf.kiss,
sizeof(path->conf.kiss));
if (mud->peer.set) {
if (!memcmp(mud->crypto.public.local,
packet->data.conf.public.remote, MUD_PUB_SIZE)) {
@@ -1052,7 +1063,6 @@ mud_packet_recv(struct mud *mud, struct mud_path *path,
mud->crypto.use_next = 1;
}
} else {
mud_kiss_path(mud, path->conf.kiss);
mud_keyx(mud, packet->data.conf.public.local,
packet->data.conf.aes);
path->state = (enum mud_state)packet->data.conf.state;