Internet-Draft jose-cose-sphincs-plus March 2023
Prorock, et al. Expires 13 September 2023 [Page]
Workgroup:
COSE
Internet-Draft:
draft-ietf-cose-sphincs-plus-00
Published:
Intended Status:
Standards Track
Expires:
Authors:
M. Prorock
mesur.io
O. Steele
Transmute
R. Misoczki
Google
M. Osborne
IBM
C. Cloostermans
NXP

JOSE and COSE Encoding for SPHINCS+

Abstract

This document describes JSON and CBOR serializations for SPHINCS+, a Post-Quantum Cryptography (PQC) signature suite.

This document does not define any new cryptography, only seralizations of existing cryptographic systems.

This document registers key types for JOSE and COSE, specifically HASH.

Key types in this document are specified by the cryptographic algorithm family in use by a particular algorithm as discussed in RFC7517.

This document registers signature algorithms types for JOSE and COSE, specifically SPHINCS+256s and others as required for use of various parameterizations of the SPHINCS+ post-quantum signature scheme.

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 13 September 2023.

Table of Contents

1. Notational Conventions

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

2. Terminology

The following terminology is used throughout this document:

PK : The public key for the signature scheme.

SK : The secret key for the signature scheme.

signature : The digital signature output.

message : The input to be signed by the signature scheme.

sha256 : The SHA-256 hash function defined in [RFC6234].

shake256 : The SHAKE256 hash function defined in [RFC8702].

3. SPHINCS-PLUS

This section defines core operations used by the signature scheme, as proposed in [SPHINCS-PLUS].

3.1. Overview

This section of the document describes the hash-based signature scheme SPHINCS+. The scheme is based on the concept of authenticating a large number or few-time signatures keypair using a combination of Merkle-tree signatures, a so-called hypertree. For each message to be signed a (pseudo-)random FTS keypair is selected with which the message can be signed. Combining this signature along with an authentication path through the hyper-tree consisting of hash-based many-time signatures then gives the SPHINC+ signature. The parameter set is strategically chosen such that the probability of signing too many messages with a specific FTS keypair to impact security is small enough to prevent forgery attacks. A trade-off in parameter set can be made on security guarantees, performance and signature size.

SPHINCS+ is a post-quantum approach to digital signatures that is promises Post-Quantum Existential Unforgeability under Chosen Message Attack (PQ-EU-CMA), while ensuring that the security levels reached meet security needs for resistance to both classical and quantum attacks. The algoritm itself is based on the hardness assumptions of its underlying hash functions, which can be chosen from the set Haraka, SHA-256 or SHAKE256. For all security levels the only operations required are calls to these hash functions on various combinations of parameters and internal states.

Contrary to CRYSTALS-Dilithium and Falcon, SPHINCS+ is not based on any algebraic structure. This reduces the possible attack surface of the algorithm.

SPHINCS+ brings several advantages over other approaches to signature suites:

  • Post-quantum in nature - use of cryptographically secure hash functions and other approaches that should remain hard problems even when under an attack utilizing quantum approaches
  • Minimal security assumptions - compared to other schemes does not base its security on a new paradigm. The security is solely based on the security of the assumptions of the underlying hash function.
  • Performance and Optimization - based on combining a great many hash function calls of SHA-256, SHAKE256 or Haraka means existing (secure) SW and HW implementations of those hash functions can be re-used for increased performance
  • Private and Public Key Size - compared to other post-quantum approaches a very small key size is the form of hash inputs-outputs. This then has the drawback that either a large signature or low signing speed has to be accepted
  • Cryptanalysis assuarance - attacks (both pre-quantum and quantum) are easy to relate to existing attacks on hash functions. This allows for precise quantification of the security levels
  • Overlap with stateful hash-based algorithms - means there are possibilities to combine implementions with those of XMSS and LMS. For example, both have the same underlying hash functions and utilize existing HW acceleration. Furthermore, an API to a XMSS implementation can be directly used by the subroutines of Sphincs+
  • Inherent resistance against side-channel attacks - since its core primitive is a hash function, it thereby is hard to attack with side-channels.

The primary known disadvantage to SPHINCS+ is the size signatures, or the speed of signing, depending on the chosen parameter set. Especially in IoT applications this might pose a problem. Additionally hash-based schemes are also vulnerable to differential and fault attacks.

3.2. Core Operations

Core operations used by the signature scheme should be implemented according to the details in [SPHINCS-PLUS]. Core operations include key generation, sign, and verify.

3.3. Using SPHINCS-PLUS with JOSE

This sections is based on CBOR Object Signing and Encryption (COSE) and JSON Object Signing and Encryption (JOSE)

3.3.1. SPHINCS-PLUS Key Representations

A new key type (kty) value "HASH" (for keys related to the family of algorithms that utilize hash based approaches to post-quantum cryptography) is defined for public key algorithms that use base 64 encoded strings of the underlying binary material as private and public keys and that support cryptographic sponge functions. It has the following parameters:

  • The parameter "kty" MUST be "HASH".

  • The parameter "alg" MUST be specified, and its value MUST be one of the values specified the below table

Table 1
alg Description
SPHINCS+128s SPHINCS+ with parameter set of 128s
SPHINCS+128f SPHINCS+ with parameter set of 128f
SPHINCS+192s SPHINCS+ with parameter set of 192s
SPHINCS+192f SPHINCS+ with parameter set of 192f
SPHINCS+256s SPHINCS+ with parameter set of 256s
SPHINCS+256f SPHINCS+ with parameter set of 256f
  • The parameter "pset" MAY be specfied to indicate the paramter set in use for the algorithm, but SHOULD also reflect the targeted NIST level for the algorithm in combination with the specified paramter set. For "alg" "HAS" one of the described parameter sets as listed in the section SPHINCS+ Algorithms MUST be specified.

  • The parameter "x" MUST be present and contain the public key encoded using the base64url [RFC4648] encoding.

  • The parameter "d" MUST be present for private keys and contain the private key encoded using the base64url encoding. This parameter MUST NOT be present for public keys.

When calculating JWK Thumbprints [RFC7638], the four public key fields are included in the hash input in lexicographic order: "kty", "alg", and "x".

When using a JWK for this algorithm, the following checks are made:

  • The "kty" field MUST be present, and it MUST be "HASH" for JOSE.

  • The "alg" field MUST be present, and it MUST represent the algorith and parameter set.

  • If the "key_ops" field is present, it MUST include "sign" when creating a HASH signature.

  • If the "key_ops" field is present, it MUST include "verify" when verifying a HASH signature.

  • If the JWK "use" field is present, its value MUST be "sig".

3.3.2. SPHINCS-PLUS Algorithms

In order to reduce the complexity of the key representation and signature representations we register a unique algorithm name per pset. This allows us to omit registering the pset term, and reduced the likelyhood that it will be misused. These alg values are used in both key representations and signatures.

Sphincs+ targets different security levels (128-, 192- and 256-bit security) and tradeoffs between size and speed. For each security level a small (s) and fast (f) parameter set is provided.

Table 2
kty alg Paramter Set
HASH SPHINCS+128s 128s
HASH SPHINCS+128f 128f
HASH SPHINCS+192s 192s
HASH SPHINCS+192f 192f
HASH SPHINCS+256s 256s
HASH SPHINCS+256f 256f

3.4. Using SPHINCS-PLUS with COSE

The approach taken here matches the work done to support secp256k1 in JOSE and COSE in [RFC8812].

The following tables map terms between JOSE and COSE for signatures.

Table 3
Name Value Description Recommended
SPHINCS+128s TBD SPHINCS+ with parameter set 128s No
SPHINCS+128f TBD SPHINCS+ with parameter set 128f No
SPHINCS+192s TBD SPHINCS+ with parameter set 192s No
SPHINCS+192f TBD SPHINCS+ with parameter set 192f No
SPHINCS+256s TBD SPHINCS+ with parameter set 256s No
SPHINCS+256f TBD SPHINCS+ with parameter set 256f No

The following tables map terms between JOSE and COSE for key types.

Table 4
Name Value Description Recommended
HASH TBD kty for hash based digital signature No

4. Security Considerations

The following considerations SHOULD apply to all parmeter sets described in this specification, unless otherwise noted.

Care should be taken to ensure "kty" and intended use match, the algorithms described in this document share many properties with other cryptographic approaches from related families that are used for purposes other than digital signatures.

4.1. Validating public keys

All algorithms in that operate on public keys require first validating those keys. For the sign, verify and proof schemes, the use of KeyValidate is REQUIRED.

4.2. Side channel attacks

Implementations of the signing algorithm SHOULD protect the secret key from side-channel attacks. Multiple best practices exist to protect against side-channel attacks. Any implementation of the the Sphincs+ signing algorithms SHOULD utilize the following best practices at a minimum:

  • Constant timing - the implementation should ensure that constant time is utilized in operations
  • Sequence and memory access persistance - the implemention SHOULD execute the exact same sequence of instructions (at a machine level) with the exact same memory access independent of which polynomial is being operated on.
  • Uniform sampling - care should be given in implementations to preserve the property of uniform sampling in implementation and to prevent information leakage.

4.3. Randomness considerations

It is recommended that the all nonces are from a trusted source of randomness.

5. IANA Considerations

The following has NOT YET been added to the "JSON Web Key Types" registry:

The following has NOT YET been added to the "JSON Web Key Parameters" registry:

The following has NOT YET been added to the "JSON Web Key Parameters" registry:

The following has NOT YET been added to the "JSON Web Key Parameters" registry:

The following has NOT YET been added to the "JSON Web Signature and Encryption Algorithms" registry:

The following has NOT YET been added to the "JSON Web Signature and Encryption Algorithms" registry:

The following has NOT YET been added to the "JSON Web Signature and Encryption Algorithms" registry:

The following has NOT YET been added to the "JSON Web Signature and Encryption Algorithms" registry:

The following has NOT YET been added to the "JSON Web Signature and Encryption Algorithms" registry:

The following has NOT YET been added to the "JSON Web Signature and Encryption Algorithms" registry:

6. Appendix

6.1. Test Vectors

6.1.1. HASH SPHINCS+256s

6.1.1.1. publicKeyJwk
{"kty":"HASH","alg":"SPHINCS+256s","x":"C_NSiMVMN6kpAv\
\1O21izzVkl7cN0ls-tX3xL8VeIOHWzfwmMJ37LvTLVXZQMFyXFTilBcLjcbPNqRCMXi\
\z_c1A"}
6.1.1.2. privateKeyJwk
{"kty":"HASH","alg":"SPHINCS+256s","x":"C_NSiMVMN6kpAv\
\1O21izzVkl7cN0ls-tX3xL8VeIOHWzfwmMJ37LvTLVXZQMFyXFTilBcLjcbPNqRCMXi\
\z_c1A","d":"-gEaHimlK26FRDpf33I6BKsfT3muN8xdOyonuYSgHtEoDxDBsTe30nU\
\O8OWZrfwJxvKyVxo6HCThjbMJX9LqSQvzUojFTDepKQL9TttYs81ZJe3DdJbPrV98S_\
\FXiDh1s38JjCd-y70y1V2UDBclxU4pQXC43GzzakQjF4s_3NQ"}
6.1.1.3. jws
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7. Normative References

[RFC2119]
Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, , <https://www.rfc-editor.org/info/rfc2119>.
[RFC4648]
Josefsson, S., "The Base16, Base32, and Base64 Data Encodings", RFC 4648, DOI 10.17487/RFC4648, , <https://www.rfc-editor.org/info/rfc4648>.
[RFC7638]
Jones, M. and N. Sakimura, "JSON Web Key (JWK) Thumbprint", RFC 7638, DOI 10.17487/RFC7638, , <https://www.rfc-editor.org/info/rfc7638>.
[RFC8702]
Kampanakis, P. and Q. Dang, "Use of the SHAKE One-Way Hash Functions in the Cryptographic Message Syntax (CMS)", RFC 8702, DOI 10.17487/RFC8702, , <https://www.rfc-editor.org/info/rfc8702>.
[RFC8812]
Jones, M., "CBOR Object Signing and Encryption (COSE) and JSON Object Signing and Encryption (JOSE) Registrations for Web Authentication (WebAuthn) Algorithms", RFC 8812, DOI 10.17487/RFC8812, , <https://www.rfc-editor.org/info/rfc8812>.
[SPHINCS-PLUS]
Hulsing, A., "Sphincs+ Stateless Hash-based Signatures", , <https://sphincs.org>.

8. Informative References

[RFC6234]
Eastlake 3rd, D. and T. Hansen, "US Secure Hash Algorithms (SHA and SHA-based HMAC and HKDF)", RFC 6234, DOI 10.17487/RFC6234, , <https://www.rfc-editor.org/info/rfc6234>.

Authors' Addresses

Michael Prorock
mesur.io
Orie Steele
Transmute
Rafael Misoczki
Google
Michael Osborne
IBM
Christine Cloostermans
NXP