SLH-DSA for JOSE and COSE

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Table of Contents

1. Introduction

SLH-DSA is derived from Version 3.1 of SPHINCS+, as noted in [FIPS-205].¶

SPHINCS+ is one of the post quantum cryptography algorithms selected in [NIST-PQC-2022].¶

TODO: Add complete examples for SLH-DSA-SHA2-128s, SLH-DSA-SHAKE-128s, SLH-DSA-SHA2-128f... ( all of them? really?)¶

2. Terminology

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. The SLH-DSA Algorithm Family

The SLH-DSA Signature Scheme is paramaterized to support different security level.¶

This document requests the registration of the following algorithms in [IANA.jose]:¶

This document requests the registration of the following algorithms in [IANA.cose]:¶

4. The SLH-DSA Key Type

Private and Public Keys are produced to enable the sign and verify opertaions for each of the SLH-DSA Algorithms.¶

This document requests the registration of the following key types in [IANA.jose]:¶

This document requests the registration of the following algorithms in [IANA.cose]:¶

5. 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.¶

6. IANA Considerations

Appendix A. Examples

{
  "kty": "SLH-DSA",
  "alg": "SLH-DSA-SHA2-128s",
  "pub": "V53SIdVF...uvw2nuCQ",
  "priv": "V53SIdVF...cDKLbsBY"
}

{
  "kty": "SLH-DSA",
  "alg": "SLH-DSA-SHA2-128s",
  "pub": "V53SIdVF...uvw2nuCQ"
}

{
  "alg": "SLH-DSA-SHA2-128s"
}

eyJhbGciOiJ...LCJraWQiOiI0MiJ9\
.\
eyJpc3MiOiJ1cm46d...XVpZDo0NTYifQ\
.\
5MSEgQ0dZB4SeLC...AAAAAABIhMUE

{                                   / COSE Key                    /
  1: 8,                             / SLH-DSA Key Type            /
  3: -51,                           / SLH-DSA-SHA2-128s Algorithm /
  -13: h'7803c0f9...3f6e2c70',      / SLH-DSA Private Key         /
  -14: h'7803c0f9...3bba7abd',      / SLH-DSA Public Key          /
}

{                                   / COSE Key                    /
  1: 8,                             / SLH-DSA Key Type            /
  3: -51,                           / SLH-DSA-SHA2-128s Algorithm /
  -13: h'7803c0f9...3f6e2c70'       / SLH-DSA Private Key         /
}

{        / Protected                   /
  1: -51 / SLH-DSA-SHA2-128s Algorithm /
}

18(                                 / COSE Sign 1            /
    [
      h'a10139d902',                / Protected              /
      {},                           / Unprotected            /
      h'66616b65',                  / Payload                /
      h'53e855e8...0f263549'        / Signature              /
    ]
)

Acknowledgments

TODO acknowledge.¶

Authors' Addresses