Use of Static-Static ECDH in JSON Object Signing and Encryption (JOSE)
draft-amringer-jose-ecdh-ss-00

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(No Working Group)                                           G. Amringer
Internet-Draft                                          January 12, 2020
Intended status: Informational
Expires: July 15, 2020

 Use of Static-Static ECDH in JSON Object Signing and Encryption (JOSE)
                     draft-amringer-jose-ecdh-ss-00

Abstract

   This document defines how to use the Static-Static mode of ECDH in
   JSON Object Signing and Encryption (JOSE).

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Notation and Conventions  . . . . . . . . . . . . . . . .   2
   2.  Key Agreement with Elliptic Curve Diffie-Hellman Static-
       Static  . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  Header Parameters Used for ECDH Key Agreement . . . . . .   3
       2.1.1.  "spk" (Sender Public Key) Header Parameter  . . . . .   3
       2.1.2.  "apu" (Agreement PartyUInfo) Header Parameter . . . .   3
     2.2.  Header Parameters Used for Key Encryption . . . . . . . .   4
       2.2.1.  "iv" (Initialization Vector) Header Parameter . . . .   4
       2.2.2.  "tag" (Authentication Tag) Header Parameter . . . . .   4
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   4.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     4.2.  Informative References  . . . . . . . . . . . . . . . . .   6
     4.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The Internet Research Task Force (IRTF) JOSE Working Group defined
   the ECDH-ES as a key agreement mechanism in the JOSE context.  This
   document defines how to use the ECDH key agreement mechanism in
   Static-Static mode in JOSE in an interoperable manner.

   This document defines the conventions to use in the context of
   [RFC7516]

1.1.  Notation and 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].

   The JOSE key format ("JSON Web Key (JWK)") is defined by [RFC7517]
   and thumbprints for it ("JSON Web Key (JWK) Thumbprint") in
   [RFC7638].

2.  Key Agreement with Elliptic Curve Diffie-Hellman Static-Static

   This section defines the specifics of key agreement with Elliptic
   Curve Diffie-Hellman Static-Static, in combination with the Concat
   KDF, as defined in Section 5.8.2.1 of NIST.800-56A [1] for use as a
   symmetric key to wrap the CEK with the "C20PKW", "XC20PKW", "A128KW",
   "A192KW", "A256KW" algorithms, in the Key Agreement with Key Wrapping
   mode.

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   This mode is used as defined as the atlernate way for ECDH-ES in
   Section 4.6.2 of RFC7518 [2] where the "apu" parameter MUST represent
   a random 512-bit value (analogous to PartyAInfo in Ephemeral-Static
   mode in [RFC2631]).

   The following "alg" (algorithm) Header Parameter values are used to
   indicate that the JWE Encrypted Key is the result of encrypting the
   CEK using the corresponding algorithm:

   +-----------------+-------------------------------------------------+
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