SUIT B. Moran Internet-Draft Arm Limited Intended status: Standards Track 24 October 2022 Expires: 27 April 2023 Mandatory-to-Implement Algorithms for Creators and Consumers of Software Update for the Internet of Things manifests draft-moran-suit-mti-02 Abstract This document specifies algorithm profiles for SUIT manifest parsers and authors to ensure better interoperability. These profiles apply specifically to a constrained node software update use case. 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 27 April 2023. Copyright Notice Copyright (c) 2022 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. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Moran Expires 27 April 2023 [Page 1] Internet-Draft MTI SUIT Algorithms October 2022 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1. Digest Algorithms . . . . . . . . . . . . . . . . . . . . 3 2.2. Authentication Algorithms . . . . . . . . . . . . . . . . 3 2.2.1. Symmetric Authentication Algorithm . . . . . . . . . 3 2.2.2. Asymmetric Classical Authentication Algorithms . . . 3 2.2.3. Asymmetric Post-Quantum Authentication Algorithms . . 3 2.3. Key Exchange Algorithms . . . . . . . . . . . . . . . . . 3 2.3.1. Symmetric . . . . . . . . . . . . . . . . . . . . . . 4 2.3.2. Classical Asymmetric . . . . . . . . . . . . . . . . 4 2.4. Encryption Algorithms . . . . . . . . . . . . . . . . . . 4 3. Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.1. Symmetric MTI profile: suit-sha256-hmac-a128-ccm . . . . 4 3.2. Current Asymmetric MTI Profile 1: suit-sha256-es256-hpke-a128gcm . . . . . . . . . . . . . 4 3.3. Current Asymmetric MTI Profile 2: suit-sha256-ed256-hpke-a128gcm . . . . . . . . . . . . . 4 3.4. Future Asymmetric MTI Profile: suit-sha256-hsslms-hpke-a128gcm . . . . . . . . . . . . . 5 3.5. Other Profiles: . . . . . . . . . . . . . . . . . . . . . 5 4. Security Considerations . . . . . . . . . . . . . . . . . . . 6 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 6 6.1. Normative References . . . . . . . . . . . . . . . . . . 6 6.2. Informative References . . . . . . . . . . . . . . . . . 6 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 6 1. Introduction Mandatory algorithms may change over time due to an evolving threat landscape. Algorithms are grouped into algorithm profiles to account for this. Profiles may be deprecated over time. SUIT will define four choices of MTI profile specifically for constrained node software update. These profiles are: * One Symmetric MTI profile * Two "Current" Asymmetric MTI profiles * One "Future" Asymmetric MTI profile At least one MTI algorithm in each category MUST be FIPS qualified. Because SUIT presents an asymmetric communication profile, with powerful/complex manifest authors and constrined manifest recipients, the requirements for Recipients and Authors are different. Moran Expires 27 April 2023 [Page 2] Internet-Draft MTI SUIT Algorithms October 2022 Recipients MAY choose which MTI profile they wish to implement. It is RECOMMENDED thaty they implement the "Future" Asymmetric MTI profile. Recipients MAY implement any number of other profiles. Authors MUST implement all MTI profiles. Authors MAY implement any number of other profiles. Other use-cases of SUIT MAY define their own MTI algorithms. 2. Algorithms The algorithms that form a part of the profiles defined in this document are grouped into: * Digest Algorithms * Authentication Algorithms * Key Exchange Algorithms * Encryption Algorithms 2.1. Digest Algorithms * SHA-256 (-16) 2.2. Authentication Algorithms Authentication Algorithms are divided into three categories: 2.2.1. Symmetric Authentication Algorithm * HMAC-256 (5) 2.2.2. Asymmetric Classical Authentication Algorithms * ES256 (-7) * EdDSA (-8) 2.2.3. Asymmetric Post-Quantum Authentication Algorithms * HSS-LMS (-46) [RFC8778] 2.3. Key Exchange Algorithms Key Exchange Algorithms are divided into two three groups: Symmetric, Classical Asymmetric, and Post-Quantum Asymmetric Moran Expires 27 April 2023 [Page 3] Internet-Draft MTI SUIT Algorithms October 2022 2.3.1. Symmetric * A128 (-3) 2.3.2. Classical Asymmetric * COSE HPKE (TBD) * ECDH-ES + HKDF-256 (-25) 2.4. Encryption Algorithms * A128GCM (1) 3. Profiles Recognized profiles are defined below. 3.1. Symmetric MTI profile: suit-sha256-hmac-a128-ccm This profile requires the following algorithms: * SHA-256 * HMAC-256 * A128W Key Wrap * AES-CCM-16-128-128 3.2. Current Asymmetric MTI Profile 1: suit-sha256-es256-hpke-a128gcm This profile requires the following algorithms: * SHA-256 * ES256 * HPKE * AES-128-GCM 3.3. Current Asymmetric MTI Profile 2: suit-sha256-ed256-hpke-a128gcm This profile requires the following algorithms: * SHA-256 Moran Expires 27 April 2023 [Page 4] Internet-Draft MTI SUIT Algorithms October 2022 * EDDSA * HPKE * AES-128-GCM 3.4. Future Asymmetric MTI Profile: suit-sha256-hsslms-hpke-a128gcm This profile requires the following algorithms: * SHA-256 * HSS-LMS * HPKE * AES-128-GCM 3.5. Other Profiles: Optional classical and PQC profiles are defined below. * suit-sha256-eddsa-ecdh-es-chacha-poly - SHA-256 - EdDSA - ECDH-ES + HKDF-256 - ChaCha20 + Poly1305 * suit-sha256-falcon512-hpke-a128gcm - SHA-256 - HSS-LMS - HPKE - AES-128-GCM * suit-shake256-dilithium-kyber-a128gcm - SHAKE256 - Crystals-Dilithium Moran Expires 27 April 2023 [Page 5] Internet-Draft MTI SUIT Algorithms October 2022 - Crystal-Kyber - AES-128GCM 4. Security Considerations TODO 5. IANA Considerations TODO 6. References 6.1. Normative References [RFC8152] Schaad, J., "CBOR Object Signing and Encryption (COSE)", RFC 8152, DOI 10.17487/RFC8152, July 2017, . [RFC8778] Housley, R., "Use of the HSS/LMS Hash-Based Signature Algorithm with CBOR Object Signing and Encryption (COSE)", RFC 8778, DOI 10.17487/RFC8778, April 2020, . 6.2. Informative References [I-D.ietf-suit-manifest] Moran, B., Tschofenig, H., Birkholz, H., Zandberg, K., and O. Rønningstad, "A Concise Binary Object Representation (CBOR)-based Serialization Format for the Software Updates for Internet of Things (SUIT) Manifest", Work in Progress, Internet-Draft, draft-ietf-suit-manifest-20, 7 October 2022, . Author's Address Brendan Moran Arm Limited Email: brendan.moran.ietf@gmail.com Moran Expires 27 April 2023 [Page 6]