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/* $OpenBSD: tls12_lib.c,v 1.4 2022/02/05 14:54:10 jsing Exp $ */
/*
* Copyright (c) 2021 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "ssl_locl.h"
static int
tls12_finished_verify_data(SSL *s, const char *finished_label,
size_t finished_label_len, uint8_t *verify_data, size_t verify_data_len,
size_t *out_len)
{
uint8_t transcript_hash[EVP_MAX_MD_SIZE];
size_t transcript_hash_len;
*out_len = 0;
if (s->session->master_key_length <= 0)
return 0;
if (verify_data_len < TLS1_FINISH_MAC_LENGTH)
return 0;
if (!tls1_transcript_hash_value(s, transcript_hash,
sizeof(transcript_hash), &transcript_hash_len))
return 0;
if (!tls1_PRF(s, s->session->master_key, s->session->master_key_length,
finished_label, finished_label_len, transcript_hash,
transcript_hash_len, NULL, 0, NULL, 0, NULL, 0, verify_data,
TLS1_FINISH_MAC_LENGTH))
return 0;
*out_len = TLS1_FINISH_MAC_LENGTH;
return 1;
}
static int
tls12_client_finished_verify_data(SSL *s, uint8_t *verify_data,
size_t verify_data_len, size_t *out_len)
{
return tls12_finished_verify_data(s, TLS_MD_CLIENT_FINISH_CONST,
TLS_MD_CLIENT_FINISH_CONST_SIZE, verify_data, verify_data_len,
out_len);
}
static int
tls12_server_finished_verify_data(SSL *s, uint8_t *verify_data,
size_t verify_data_len, size_t *out_len)
{
return tls12_finished_verify_data(s, TLS_MD_SERVER_FINISH_CONST,
TLS_MD_SERVER_FINISH_CONST_SIZE, verify_data, verify_data_len,
out_len);
}
int
tls12_derive_finished(SSL *s)
{
if (!s->server) {
return tls12_client_finished_verify_data(s,
s->s3->hs.finished, sizeof(s->s3->hs.finished),
&s->s3->hs.finished_len);
} else {
return tls12_server_finished_verify_data(s,
s->s3->hs.finished, sizeof(s->s3->hs.finished),
&s->s3->hs.finished_len);
}
}
int
tls12_derive_peer_finished(SSL *s)
{
if (s->server) {
return tls12_client_finished_verify_data(s,
s->s3->hs.peer_finished, sizeof(s->s3->hs.peer_finished),
&s->s3->hs.peer_finished_len);
} else {
return tls12_server_finished_verify_data(s,
s->s3->hs.peer_finished, sizeof(s->s3->hs.peer_finished),
&s->s3->hs.peer_finished_len);
}
}
int
tls12_derive_master_secret(SSL *s, uint8_t *premaster_secret,
size_t premaster_secret_len)
{
s->session->master_key_length = 0;
if (premaster_secret_len == 0)
return 0;
CTASSERT(sizeof(s->session->master_key) == SSL_MAX_MASTER_KEY_LENGTH);
if (!tls1_PRF(s, premaster_secret, premaster_secret_len,
TLS_MD_MASTER_SECRET_CONST, TLS_MD_MASTER_SECRET_CONST_SIZE,
s->s3->client_random, SSL3_RANDOM_SIZE, NULL, 0,
s->s3->server_random, SSL3_RANDOM_SIZE, NULL, 0,
s->session->master_key, sizeof(s->session->master_key)))
return 0;
s->session->master_key_length = SSL_MAX_MASTER_KEY_LENGTH;
return 1;
}
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