Crypto Forum D. Connolly
Internet-Draft SandboxAQ
Intended status: Informational 3 March 2025
Expires: 4 September 2025
SHA-3 for HPKE
draft-connolly-cfrg-sha3-hpke-00
Abstract
This document defines Secure Hashing Algorithm-3 (SHA-3) options for
Hybrid Public-Key Encryption (HPKE) as registered KDFs.
About This Document
This note is to be removed before publishing as an RFC.
The latest revision of this draft can be found at
https://dconnolly.github.io/draft-connolly-cfrg-sha3-hpke/draft-
connolly-cfrg-sha3-hpke.html. Status information for this document
may be found at https://datatracker.ietf.org/doc/draft-connolly-cfrg-
sha3-hpke/.
Discussion of this document takes place on the Crypto Forum mailing
list (mailto:cfrg@ietf.org), which is archived at
https://mailarchive.ietf.org/arch/browse/cfrg. Subscribe at
https://www.ietf.org/mailman/listinfo/cfrg/.
Source for this draft and an issue tracker can be found at
https://github.com/dconnolly/draft-connolly-cfrg-sha3-hpke.
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
working documents as Internet-Drafts. The list of current Internet-
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 4 September 2025.
Connolly Expires 4 September 2025 [Page 1]
Internet-Draft sha3-hpke March 2025
Copyright Notice
Copyright (c) 2025 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 to this document.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions and Definitions . . . . . . . . . . . . . . . . . 2
3. Security Considerations . . . . . . . . . . . . . . . . . . . 2
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 2
5. Normative References . . . . . . . . . . . . . . . . . . . . 3
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 3
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 3
1. Introduction
TODO Introduction
2. Conventions and Definitions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
3. Security Considerations
TODO Security
4. IANA Considerations
This document requests/registers three new entries to the "HPKE KDF
Identifiers" registry.
Value: 0x0004 (please) KDF:
SHA3-256 Nh: The output size of the Extract function in bytes
32 Reference:
Connolly Expires 4 September 2025 [Page 2]
Internet-Draft sha3-hpke March 2025
[FIPS202]
Value: 0x0005 (please) KDF:
SHA3-384 Nh: The output size of the Extract function in bytes
48 Reference:
[FIPS202]
Value: 0x0006 (please) KDF:
SHA3-512 Nh: The output size of the Extract function in bytes
64 Reference:
[FIPS202]
5. Normative References
[FIPS202] "SHA-3 standard :: permutation-based hash and extendable-
output functions", National Institute of Standards and
Technology (U.S.), DOI 10.6028/nist.fips.202, 2015,
<https://doi.org/10.6028/nist.fips.202>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/rfc/rfc2119>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/rfc/rfc8174>.
[RFC9180] Barnes, R., Bhargavan, K., Lipp, B., and C. Wood, "Hybrid
Public Key Encryption", RFC 9180, DOI 10.17487/RFC9180,
February 2022, <https://www.rfc-editor.org/rfc/rfc9180>.
Acknowledgments
TODO acknowledge.
Author's Address
Deirdre Connolly
SandboxAQ
Email: durumcrustulum@gmail.com
Connolly Expires 4 September 2025 [Page 3]