tls13: add key_schedule_stage_early_data
Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls13_keys.c b/library/ssl_tls13_keys.c
index 7aec21d..b7beb12 100644
--- a/library/ssl_tls13_keys.c
+++ b/library/ssl_tls13_keys.c
@@ -820,4 +820,31 @@
return( 0 );
}
+int mbedtls_ssl_tls13_key_schedule_stage_early_data( mbedtls_ssl_context *ssl )
+{
+ int ret = 0;
+
+ if( ssl->handshake->ciphersuite_info == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher suite info not found" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+ mbedtls_md_type_t const md_type = ssl->handshake->ciphersuite_info->mac;
+ const unsigned char *input = NULL;
+ size_t input_len = 0;
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+ input = ssl->handshake->psk;
+ input_len = ssl->handshake->psk_len;
+#endif
+ ret = mbedtls_ssl_tls1_3_evolve_secret( md_type, NULL, input, input_len,
+ ssl->handshake->tls13_master_secrets.early );
+ if( ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls1_3_evolve_secret", ret );
+ return( ret );
+ }
+
+ return( 0 );
+}
+
#endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */