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ssl_tls13_client.c: Move writing of TLS 1.3 specific extensions

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Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2022-02-18 12:06:07 +01:00
parent 12dcdf0d6e
commit 04fbd2b2ff
1 changed files with 47 additions and 23 deletions
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70
library/ssl_tls13_client.c
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@ -805,6 +805,49 @@ static int ssl_tls13_write_client_hello_cipher_suites(
return( 0 );
}
static int ssl_tls13_write_client_hello_exts( mbedtls_ssl_context *ssl,
unsigned char *buf,
unsigned char *end,
size_t *out_len )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char *p = buf;
size_t ext_len;
*out_len = 0;
/* Write supported_versions extension
*
* Supported Versions Extension is mandatory with TLS 1.3.
*/
ret = ssl_tls13_write_supported_versions_ext( ssl, p, end, &ext_len );
if( ret != 0 )
return( ret );
p += ext_len;
/* Echo the cookie if the server provided one in its preceding
* HelloRetryRequest message.
*/
ret = ssl_tls13_write_cookie_ext( ssl, p, end, &ext_len );
if( ret != 0 )
return( ret );
p += ext_len;
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
if( mbedtls_ssl_conf_tls13_some_ephemeral_enabled( ssl ) )
{
ret = ssl_tls13_write_key_share_ext( ssl, p, end, &ext_len );
if( ret != 0 )
return( ret );
p += ext_len;
}
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
*out_len = p - buf;
return( 0 );
}
/*
* Structure of ClientHello message:
*
@ -907,11 +950,7 @@ static int ssl_tls13_write_client_hello_body( mbedtls_ssl_context *ssl,
p_extensions_len = p;
p += 2;
/* Write supported_versions extension
*
* Supported Versions Extension is mandatory with TLS 1.3.
*/
ret = ssl_tls13_write_supported_versions_ext( ssl, p, end, &output_len );
ret = ssl_tls13_write_client_hello_exts( ssl, p, end, &output_len );
if( ret != 0 )
return( ret );
p += output_len;
@ -923,32 +962,17 @@ static int ssl_tls13_write_client_hello_body( mbedtls_ssl_context *ssl,
p += output_len;
#endif /* MBEDTLS_SSL_ALPN */
/* Echo the cookie if the server provided one in its preceding
* HelloRetryRequest message.
*/
ret = ssl_tls13_write_cookie_ext( ssl, p, end, &output_len );
if( ret != 0 )
return( ret );
p += output_len;
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
/*
* Add the extensions related to (EC)DHE ephemeral key establishment only if
* enabled as per the configuration.
*/
if( mbedtls_ssl_conf_tls13_some_ephemeral_enabled( ssl ) )
{
ret = mbedtls_ssl_write_supported_groups_ext( ssl, p, end, &output_len );
if( ret != 0 )
return( ret );
p += output_len;
}
ret = ssl_tls13_write_key_share_ext( ssl, p, end, &output_len );
if( ret != 0 )
return( ret );
p += output_len;
if( mbedtls_ssl_conf_tls13_ephemeral_enabled( ssl ) )
{
ret = mbedtls_ssl_write_sig_alg_ext( ssl, p, end, &output_len );
if( ret != 0 )
return( ret );