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add supported versions extension

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Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
This commit is contained in:
Jerry Yu 2021-08-24 16:29:02 +08:00
parent bc20bdd3a9
commit ef6b36b484
1 changed files with 38 additions and 4 deletions
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42
library/ssl_tls13_client.c
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@ -400,15 +400,49 @@ static int ssl_client_hello_write_partial( mbedtls_ssl_context* ssl,
return( 0 );
}
/*
* ssl_write_supported_versions_ext():
*
* struct {
* ProtocolVersion versions<2..254>;
* } SupportedVersions;
*/
static void ssl_write_supported_versions_ext( mbedtls_ssl_context *ssl,
unsigned char* buf,
unsigned char* end,
size_t* olen )
{
((void) ssl);
((void) buf);
((void) end);
((void) olen);
unsigned char *p = buf;
*olen = 0;
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported version extension" ) );
if( end < p || (size_t)( end - p ) < 7 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
return;
}
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS ) & 0xFF );
/* total length */
*p++ = 0x00;
*p++ = 3;
/* length of next field */
*p++ = 0x2;
/* This implementation only supports a single TLS version, and only
* advertises a single value.
*/
mbedtls_ssl_write_version( ssl->conf->max_major_ver, ssl->conf->max_minor_ver,
ssl->conf->transport, p );
MBEDTLS_SSL_DEBUG_MSG( 3, ( "supported version: [%d:%d]", ssl->conf->max_major_ver, ssl->conf->max_minor_ver ) );
*olen = 7;
}
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)