tls13: Share write ecdh_key_exchange function
Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index cf5b382..d024abf 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -204,65 +204,6 @@
/*
* Functions for writing key_share extension.
*/
-#if defined(MBEDTLS_ECDH_C)
-static int ssl_tls13_generate_and_write_ecdh_key_exchange(
- mbedtls_ssl_context *ssl,
- uint16_t named_group,
- unsigned char *buf,
- unsigned char *end,
- size_t *out_len )
-{
- psa_status_t status = PSA_ERROR_GENERIC_ERROR;
- int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
- psa_key_attributes_t key_attributes;
- size_t own_pubkey_len;
- mbedtls_ssl_handshake_params *handshake = ssl->handshake;
- size_t ecdh_bits = 0;
-
- MBEDTLS_SSL_DEBUG_MSG( 1, ( "Perform PSA-based ECDH computation." ) );
-
- /* Convert EC group to PSA key type. */
- if( ( handshake->ecdh_psa_type =
- mbedtls_psa_parse_tls_ecc_group( named_group, &ecdh_bits ) ) == 0 )
- return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
-
- ssl->handshake->ecdh_bits = ecdh_bits;
-
- key_attributes = psa_key_attributes_init();
- psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE );
- psa_set_key_algorithm( &key_attributes, PSA_ALG_ECDH );
- psa_set_key_type( &key_attributes, handshake->ecdh_psa_type );
- psa_set_key_bits( &key_attributes, handshake->ecdh_bits );
-
- /* Generate ECDH private key. */
- status = psa_generate_key( &key_attributes,
- &handshake->ecdh_psa_privkey );
- if( status != PSA_SUCCESS )
- {
- ret = psa_ssl_status_to_mbedtls( status );
- MBEDTLS_SSL_DEBUG_RET( 1, "psa_generate_key", ret );
- return( ret );
-
- }
-
- /* Export the public part of the ECDH private key from PSA. */
- status = psa_export_public_key( handshake->ecdh_psa_privkey,
- buf, (size_t)( end - buf ),
- &own_pubkey_len );
- if( status != PSA_SUCCESS )
- {
- ret = psa_ssl_status_to_mbedtls( status );
- MBEDTLS_SSL_DEBUG_RET( 1, "psa_export_public_key", ret );
- return( ret );
-
- }
-
- *out_len = own_pubkey_len;
-
- return( 0 );
-}
-#endif /* MBEDTLS_ECDH_C */
-
static int ssl_tls13_get_default_group_id( mbedtls_ssl_context *ssl,
uint16_t *group_id )
{
@@ -367,8 +308,8 @@
*/
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 );
p += 4;
- ret = ssl_tls13_generate_and_write_ecdh_key_exchange( ssl, group_id, p, end,
- &key_exchange_len );
+ ret = mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange(
+ ssl, group_id, p, end, &key_exchange_len );
p += key_exchange_len;
if( ret != 0 )
return( ret );