Split tls13_record_layer_set_traffic_keys() into two separate functions.

This allows the read traffic key to be set independently of the write
traffic key. This will become necessary for KeyUpdate handling, however
also allows for switching to application traffic keys at more appropriate
stages of the handshake.

ok tb@

1 files changed, 13 insertions, 11 deletions

diff --git a/src/lib/libssl/tls13_record_layer.c b/src/lib/libssl/tls13_record_layer.c
index b70f9f174e..dbb5695d5e 100644
--- a/src/lib/libssl/tls13_record_layer.c
+++ b/src/lib/libssl/tls13_record_layer.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tls13_record_layer.c,v 1.1 2019/01/20 10:31:54 jsing Exp $ */
+/* $OpenBSD: tls13_record_layer.c,v 1.2 2019/02/14 17:55:32 jsing Exp $ */
 /*
  * Copyright (c) 2018, 2019 Joel Sing <jsing@openbsd.org>
  *
@@ -260,21 +260,23 @@ tls13_record_layer_set_traffic_key(const EVP_AEAD *aead, EVP_AEAD_CTX *aead_ctx,
 }
 
 int
-tls13_record_layer_set_traffic_keys(struct tls13_record_layer *rl,
-    struct tls13_secret *read_key, struct tls13_secret *write_key)
+tls13_record_layer_set_read_traffic_key(struct tls13_record_layer *rl,
+    struct tls13_secret *read_key)
 {
         memset(rl->read_seq_num, 0, TLS13_RECORD_SEQ_NUM_LEN);
-        memset(rl->write_seq_num, 0, TLS13_RECORD_SEQ_NUM_LEN);
 
-        if (!tls13_record_layer_set_traffic_key(rl->aead, &rl->read_aead_ctx,
-            rl->hash, &rl->read_iv, &rl->read_nonce, read_key))
-                return 0;
+        return tls13_record_layer_set_traffic_key(rl->aead, &rl->read_aead_ctx,
+            rl->hash, &rl->read_iv, &rl->read_nonce, read_key);
+}
 
-        if (!tls13_record_layer_set_traffic_key(rl->aead, &rl->write_aead_ctx,
-            rl->hash, &rl->write_iv, &rl->write_nonce, write_key))
-                return 0;
+int
+tls13_record_layer_set_write_traffic_key(struct tls13_record_layer *rl,
+    struct tls13_secret *write_key)
+{
+        memset(rl->write_seq_num, 0, TLS13_RECORD_SEQ_NUM_LEN);
 
-        return 1;
+        return tls13_record_layer_set_traffic_key(rl->aead, &rl->write_aead_ctx,
+            rl->hash, &rl->write_iv, &rl->write_nonce, write_key);
 }
 
 static int