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Introduce helper macro for traversal of supported EC TLS IDs

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This commit is contained in:
Hanno Becker 2019-06-18 16:55:47 +01:00
parent 80855881ec
commit a4a9c696c1
4 changed files with 59 additions and 46 deletions
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46
library/ssl_cli.c
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@ -251,6 +251,18 @@ static void ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl,
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
static size_t ssl_get_ec_curve_list_length( mbedtls_ssl_context *ssl )
{
size_t ec_list_len = 0;
MBEDTLS_SSL_BEGIN_FOR_EACH_SUPPORTED_EC_TLS_ID( tls_id )
((void) tls_id);
ec_list_len++;
MBEDTLS_SSL_END_FOR_EACH_SUPPORTED_EC_TLS_ID
return( ec_list_len );
}
static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
unsigned char *buf,
size_t *olen )
@ -259,28 +271,15 @@ static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
unsigned char *elliptic_curve_list = p + 6;
size_t elliptic_curve_len = 0;
const mbedtls_ecp_curve_info *info;
#if defined(MBEDTLS_ECP_C)
const mbedtls_ecp_group_id *grp_id;
#else
((void) ssl);
#endif
*olen = 0;
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported_elliptic_curves extension" ) );
for( grp_id = ssl->conf->curve_list; *grp_id != MBEDTLS_ECP_DP_NONE; grp_id++ )
{
info = mbedtls_ecp_curve_info_from_grp_id( *grp_id );
if( info == NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid curve in ssl configuration" ) );
return;
}
elliptic_curve_len += 2;
}
/* Each elliptic curve is encoded in 2 bytes. */
elliptic_curve_len = 2 * ssl_get_ec_curve_list_length( ssl );
if( elliptic_curve_len == 0 )
return;
if( end < p || (size_t)( end - p ) < 6 + elliptic_curve_len )
{
@ -290,15 +289,10 @@ static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
elliptic_curve_len = 0;
for( grp_id = ssl->conf->curve_list; *grp_id != MBEDTLS_ECP_DP_NONE; grp_id++ )
{
info = mbedtls_ecp_curve_info_from_grp_id( *grp_id );
elliptic_curve_list[elliptic_curve_len++] = info->tls_id >> 8;
elliptic_curve_list[elliptic_curve_len++] = info->tls_id & 0xFF;
}
if( elliptic_curve_len == 0 )
return;
MBEDTLS_SSL_BEGIN_FOR_EACH_SUPPORTED_EC_TLS_ID( tls_id )
elliptic_curve_list[elliptic_curve_len++] = tls_id >> 8;
elliptic_curve_list[elliptic_curve_len++] = tls_id & 0xFF;
MBEDTLS_SSL_END_FOR_EACH_SUPPORTED_EC_TLS_ID
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES ) & 0xFF );