Implement experimental alternate encoding of TLS 1.3.
TLS 1.3 deployment is currently blocked by buggy middleboxes
throughout the ecosystem. As an experiment to better understand these bugs
and the problems they are causing, implement TLS 1.3 variants with
alternate encodings. These are still the same protocol, only encoded
slightly differently. We will use what we learn from these experiments to
guide the TLS 1.3 deployment strategy and proposals to the IETF, if any.
These experiments only target the basic 1-RTT TLS 1.3 handshake. Based on
what we learn from this experiment, we may try future variations to
explore 0-RTT and HelloRetryRequest.
When enabled, the server supports all TLS 1.3 variants while the client
is configured to use a particular variant.
Change-Id: I532411d1abc41314dc76acce0246879b754b4c61
Reviewed-on: https://boringssl-review.googlesource.com/17327
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/ssl/internal.h b/ssl/internal.h
index f6cea7a..45f918e 100644
--- a/ssl/internal.h
+++ b/ssl/internal.h
@@ -974,6 +974,7 @@
ssl_hs_pending_ticket,
ssl_hs_early_data_rejected,
ssl_hs_read_end_of_early_data,
+ ssl_hs_read_change_cipher_spec,
};
struct ssl_handshake_st {
@@ -1007,6 +1008,11 @@
* |SSL_OP_NO_*| and |SSL_CTX_set_max_proto_version| APIs. */
uint16_t max_version;
+ /* session_id is the session ID in the ClientHello, used for the experimental
+ * TLS 1.3 variant. */
+ uint8_t session_id[SSL_MAX_SSL_SESSION_ID_LENGTH];
+ uint8_t session_id_len;
+
size_t hash_len;
uint8_t secret[EVP_MAX_MD_SIZE];
uint8_t early_traffic_secret[EVP_MAX_MD_SIZE];
