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Remove a useless memcpy in mud_ctrl_path()

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This commit is contained in:
Adrien Gallouët
2016-07-25 11:17:32 +00:00
parent 1fe5190e8a
commit ed46a3b1ea
1 changed files with 27 additions and 22 deletions
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43
mud.c
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@@ -697,6 +697,9 @@ int mud_encrypt (struct mud *mud, uint64_t nonce,
const unsigned char *src, size_t src_size,
size_t ad_size)
{
if (!nonce)
return 0;
if (ad_size > src_size)
ad_size = src_size;
@@ -719,15 +722,11 @@ int mud_encrypt (struct mud *mud, uint64_t nonce,
if (src)
memcpy(dst+MUD_TIME_SIZE, src, ad_size);
if (nonce) {
if (mud->crypto.use_next) {
mud_encrypt_opt(&mud->crypto.next, &opt);
} else {
mud_encrypt_opt(&mud->crypto.current, &opt);
}
} else {
mud_encrypt_opt(&mud->crypto.private, &opt);
}
return size;
}
@@ -836,30 +835,36 @@ static
void mud_ctrl_path (struct mud *mud, enum mud_msg msg, struct path *path,
uint64_t now)
{
unsigned char data[256];
unsigned char ctrl[sizeof(data)+MUD_PACKET_MIN_SIZE];
size_t size = MUD_TIME_SIZE;
struct {
unsigned char zero[MUD_TIME_SIZE];
unsigned char time[MUD_TIME_SIZE];
unsigned char data[128+MUD_MAC_SIZE];
} ctrl;
mud_write48(data, now);
size_t size = 0;
memset(ctrl.zero, 0, MUD_TIME_SIZE);
mud_write48(ctrl.time, now);
if (msg == mud_pong) {
mud_write48(&data[MUD_TIME_SIZE], path->recv_send_time);
mud_write48(&data[MUD_TIME_SIZE*2], path->rdt);
size += MUD_TIME_SIZE*2;
mud_write48(&ctrl.data[0], path->recv_send_time);
mud_write48(&ctrl.data[MUD_TIME_SIZE], path->rdt);
size = MUD_TIME_SIZE*2;
}
if (msg == mud_keyx) {
memcpy(&data[MUD_TIME_SIZE], &mud->crypto.public,
sizeof(mud->crypto.public));
size += sizeof(mud->crypto.public);
memcpy(ctrl.data, &mud->crypto.public, sizeof(mud->crypto.public));
size = sizeof(mud->crypto.public);
}
int ret = mud_encrypt(mud, 0, ctrl, sizeof(ctrl), data, size, size);
struct crypto_opt opt = {
.dst = ctrl.data+size,
.ad = { .data = ctrl.zero,
.size = size+2*MUD_TIME_SIZE },
};
if (ret <= 0)
return;
mud_send_path(mud, path, now, ctrl, ret);
mud_encrypt_opt(&mud->crypto.private, &opt);
mud_send_path(mud, path, now, &ctrl, size+2*MUD_TIME_SIZE+MUD_MAC_SIZE);
}
static