QUIC: refactored key handling. All key handling functionality is moved into ngx_quic_protection.c. Public structures from ngx_quic_protection.h are now private and new methods are available to manipulate keys. A negotiated cipher is cached in QUIC connection from the set secret callback to avoid calling SSL_get_current_cipher() on each encrypt/decrypt operation. This also reduces the number of unwanted c->ssl->connection occurrences.

--- a/src/event/ngx_event_quic.h
+++ b/src/event/ngx_event_quic.h
@@ -116,6 +116,9 @@ struct ngx_quic_stream_s {
 };
 
 
+typedef struct ngx_quic_keys_s  ngx_quic_keys_t;
+
+
 void ngx_quic_run(ngx_connection_t *c, ngx_quic_conf_t *conf);
 ngx_connection_t *ngx_quic_open_stream(ngx_connection_t *c, ngx_uint_t bidi);
 void ngx_quic_finalize_connection(ngx_connection_t *c, ngx_uint_t err,