--- a/src/event/ngx_event_quic.h
+++ b/src/event/ngx_event_quic.h
@@ -52,5 +52,12 @@ uint64_t ngx_quic_parse_pn(u_char **pos,
 uint64_t ngx_quic_parse_int(u_char **pos);
 void ngx_quic_build_int(u_char **pos, uint64_t value);
 
+ngx_int_t ngx_hkdf_extract(u_char *out_key, size_t *out_len,
+    const EVP_MD *digest, const u_char *secret, size_t secret_len,
+    const u_char *salt, size_t salt_len);
+ngx_int_t ngx_hkdf_expand(u_char *out_key, size_t out_len,
+    const EVP_MD *digest, const u_char *prk, size_t prk_len,
+    const u_char *info, size_t info_len);
+
 
 #endif /* _NGX_EVENT_QUIC_H_INCLUDED_ */