Compact TLS 1.3
draft-rescorla-tls-ctls-03
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2019-11-20
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TLS Working Group E. Rescorla
Internet-Draft Mozilla
Intended status: Informational R. Barnes
Expires: May 7, 2020 Cisco
H. Tschofenig
Arm Limited
November 04, 2019
Compact TLS 1.3
draft-rescorla-tls-ctls-03
Abstract
This document specifies a "compact" version of TLS 1.3. It is
isomorphic to TLS 1.3 but saves space by trimming obsolete material,
tighter encoding, and a template-based specialization technique. cTLS
is not directly interoperable with TLS 1.3, but it should eventually
be possible for a cTLS/TLS 1.3 server to exist and successfully
interoperate.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 7, 2020.
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
Rescorla, et al. Expires May 7, 2020 [Page 1]
Internet-Draft cTLS 1.3 November 2019
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions and Definitions . . . . . . . . . . . . . . . . . 3
3. Common Primitives . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Varints . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.2. Record Layer . . . . . . . . . . . . . . . . . . . . . . 4
3.3. Handshake Layer . . . . . . . . . . . . . . . . . . . . . 5
3.4. Extensions . . . . . . . . . . . . . . . . . . . . . . . 5
4. Handshake Messages . . . . . . . . . . . . . . . . . . . . . 6
4.1. ClientHello . . . . . . . . . . . . . . . . . . . . . . . 6
4.1.1. KeyShare, SupportedGroups, and SignatureAlgorithms . 6
4.1.2. PreSharedKeys . . . . . . . . . . . . . . . . . . . . 6
4.2. ServerHello . . . . . . . . . . . . . . . . . . . . . . . 6
4.3. EncryptedExtensions . . . . . . . . . . . . . . . . . . . 7
4.4. CertificateRequest . . . . . . . . . . . . . . . . . . . 7
4.5. Certificate . . . . . . . . . . . . . . . . . . . . . . . 7
4.6. CertificateVerify . . . . . . . . . . . . . . . . . . . . 8
4.7. Finished . . . . . . . . . . . . . . . . . . . . . . . . 8
4.8. HelloRetryRequest . . . . . . . . . . . . . . . . . . . . 8
5. Template-Based Specialization . . . . . . . . . . . . . . . . 9
5.1. Specifying a Specialization . . . . . . . . . . . . . . . 9
5.1.1. Requirements on the TLS Implementation . . . . . . . 11
5.1.2. Predefined Extensions . . . . . . . . . . . . . . . . 12
5.1.3. Known Certificates . . . . . . . . . . . . . . . . . 13
6. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7. Security Considerations . . . . . . . . . . . . . . . . . . . 14
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
9. Normative References . . . . . . . . . . . . . . . . . . . . 14
Appendix A. Sample Transcripts . . . . . . . . . . . . . . . . . 15
A.1. ECDHE and Mutual Certificate-based Authentication . . . . 15
A.2. PSK . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 19
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 19
1. Introduction
DISCLAIMER: This is a work-in-progress draft of cTLS and has not yet
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