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tls: do not compile in TLS_RSA_WITH_NULL_SHA256 code if unreachable

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function                                             old     new   delta
tls_handshake                                       1595    1588      -7
xwrite_encrypted                                     244     209     -35

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-04-04 01:41:15 +02:00
parent 229d3c467d
commit 5d561ef634
1 changed files with 12 additions and 5 deletions
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17
networking/tls.c
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@ -39,7 +39,7 @@
// works against "openssl s_server -cipher NULL"
// and against wolfssl-3.9.10-stable/examples/server/server.c:
//#define CIPHER_ID TLS_RSA_WITH_NULL_SHA256 // for testing (does everything except encrypting)
//#define CIPHER_ID1 TLS_RSA_WITH_NULL_SHA256 // for testing (does everything except encrypting)
// works against wolfssl-3.9.10-stable/examples/server/server.c
// works for kernel.org
@ -565,8 +565,11 @@ static void xwrite_encrypted(tls_state_t *tls, unsigned size, unsigned type)
uint8_t padding_length;
xhdr = (void*)(buf - RECHDR_LEN);
if (tls->cipher_id != TLS_RSA_WITH_NULL_SHA256)
if (CIPHER_ID1 != TLS_RSA_WITH_NULL_SHA256 /* if "no encryption" can't be selected */
|| tls->cipher_id != TLS_RSA_WITH_NULL_SHA256 /* or if it wasn't selected */
) {
xhdr = (void*)(buf - RECHDR_LEN - AES_BLOCKSIZE); /* place for IV */
}
xhdr->type = type;
xhdr->proto_maj = TLS_MAJ;
@ -620,7 +623,9 @@ static void xwrite_encrypted(tls_state_t *tls, unsigned size, unsigned type)
// -------- ----------- ---------- --------------
// SHA HMAC-SHA1 20 20
// SHA256 HMAC-SHA256 32 32
if (tls->cipher_id == TLS_RSA_WITH_NULL_SHA256) {
if (CIPHER_ID1 == TLS_RSA_WITH_NULL_SHA256
&& tls->cipher_id == TLS_RSA_WITH_NULL_SHA256
) {
/* No encryption, only signing */
xhdr->len16_hi = size >> 8;
xhdr->len16_lo = size & 0xff;
@ -1666,9 +1671,11 @@ void FAST_FUNC tls_handshake(tls_state_t *tls, const char *sni)
if (len != 1 || memcmp(tls->inbuf, rec_CHANGE_CIPHER_SPEC, 6) != 0)
bad_record_die(tls, "switch to encrypted traffic", len);
dbg("<< CHANGE_CIPHER_SPEC\n");
if (tls->cipher_id == TLS_RSA_WITH_NULL_SHA256)
if (CIPHER_ID1 == TLS_RSA_WITH_NULL_SHA256
&& tls->cipher_id == TLS_RSA_WITH_NULL_SHA256
) {
tls->min_encrypted_len_on_read = tls->MAC_size;
else {
} else {
unsigned mac_blocks = (unsigned)(tls->MAC_size + AES_BLOCKSIZE-1) / AES_BLOCKSIZE;
/* all incoming packets now should be encrypted and have
* at least IV + (MAC padded to blocksize):