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Fix GCC warning in ssl_calc_finished_tls_sha384

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This commit fixes the same warning fixed by baeedbf9, but without
wasting RAM. By casting `mbedtls_sha512_finish_ret()`, `padbuf`
could be kept 48 bytes long without triggering any warnings.

Signed-off-by: Rodrigo Dias Correa <rodrigo@correas.us>
This commit is contained in:
Rodrigo Dias Correa 2020-11-25 00:42:28 -03:00
parent ddcc0b7982
commit d7853a847d
1 changed files with 11 additions and 2 deletions
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13
library/ssl_tls.c
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@ -5405,13 +5405,16 @@ static void ssl_calc_finished_tls_sha256(
#endif /* MBEDTLS_SHA256_C */ #endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA512_C) #if defined(MBEDTLS_SHA512_C)
typedef int (*finish_sha384_t)(mbedtls_sha512_context*, unsigned char[48]);
static void ssl_calc_finished_tls_sha384( static void ssl_calc_finished_tls_sha384(
mbedtls_ssl_context *ssl, unsigned char *buf, int from ) mbedtls_ssl_context *ssl, unsigned char *buf, int from )
{ {
int len = 12; int len = 12;
const char *sender; const char *sender;
mbedtls_sha512_context sha512; mbedtls_sha512_context sha512;
unsigned char padbuf[64]; unsigned char padbuf[48];
mbedtls_ssl_session *session = ssl->session_negotiate; mbedtls_ssl_session *session = ssl->session_negotiate;
if( !session ) if( !session )
@ -5438,7 +5441,13 @@ static void ssl_calc_finished_tls_sha384(
? "client finished" ? "client finished"
: "server finished"; : "server finished";
mbedtls_sha512_finish_ret( &sha512, padbuf ); /*
* For SHA-384, we can save 16 bytes by keeping padbuf 48 bytes long.
* However, to avoid stringop-overflow warning in gcc, we have to cast
* mbedtls_sha512_finish_ret().
*/
finish_sha384_t finish = (finish_sha384_t)mbedtls_sha512_finish_ret;
finish( &sha512, padbuf );
ssl->handshake->tls_prf( session->master, 48, sender, ssl->handshake->tls_prf( session->master, 48, sender,
padbuf, 48, buf, len ); padbuf, 48, buf, len );