Add compute early transform
Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls13_keys.h b/library/ssl_tls13_keys.h
index 966b5c5..81414d8 100644
--- a/library/ssl_tls13_keys.h
+++ b/library/ssl_tls13_keys.h
@@ -667,6 +667,23 @@
size_t *actual_len,
int which );
+#if defined(MBEDTLS_SSL_EARLY_DATA)
+/**
+ * \brief Compute TLS 1.3 early transform
+ *
+ * \param ssl The SSL context to operate on. The early secret must have been
+ * computed.
+ *
+ * \returns \c 0 on success.
+ * \returns A negative error code on failure.
+ *
+ * \warning `early_secrets` is not computation. Caller MUST call
+ * mbedtls_ssl_tls13_key_schedule_stage_early() before this function.
+ */
+MBEDTLS_CHECK_RETURN_CRITICAL
+int mbedtls_ssl_tls13_compute_early_transform( mbedtls_ssl_context *ssl );
+#endif /* MBEDTLS_SSL_EARLY_DATA */
+
/**
* \brief Compute TLS 1.3 handshake transform
*