Chacha derived AEAD algorithms in JSON Object Signing and Encryption (JOSE)
draft-amringer-jose-chacha-01

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(No Working Group)                                           G. Amringer
Internet-Draft                                             July 23, 2019
Intended status: Informational
Expires: January 24, 2020

  Chacha derived AEAD algorithms in JSON Object Signing and Encryption
                                 (JOSE)
                     draft-amringer-jose-chacha-01

Abstract

   This document defines how to use the AEAD algorithms
   "AEAD_XCHACHA20_POLY1305" and "AEAD_CHACHA20_POLY1305" from [RFC8439]
   and [I-D.irtf-cfrg-xchacha] in JSON Object Signing and Encryption
   (JOSE).

Status of This Memo

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   This Internet-Draft will expire on January 24, 2020.

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   document authors.  All rights reserved.

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Amringer                Expires January 24, 2020                [Page 1]
Internet-Draft                                                 July 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Notation and Conventions  . . . . . . . . . . . . . . . .   2
   2.  Key Encryption  . . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  Algorithms  . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Header Parameters Used for Key Encryption . . . . . . . .   3
       2.2.1.  "iv" (Initialization Vector) Header Parameter . . . .   3
       2.2.2.  "tag" (Authentication Tag) Header Parameter . . . . .   3
   3.  Key Agreement with Elliptic Curve Diffie-Hellman Ephemeral
       Static  . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Content Encryption  . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Algorithms  . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     6.2.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The Internet Research Task Force (IRTF) Crypto Forum Research Group
   (CFRG) defined the ChaCha20 and Poly1305 algorithms to be used in
   IETF protocols both independantly and as an AEAD construction
   ([RFC8439]).  It has also been presented with a definition of an
   eXtended-nonce variant ([I-D.irtf-cfrg-xchacha]) for use in stateless
   contexts.  This document defines how to use those algorithms in JOSE
   in an interoperable manner.

   This document defines the conventions to use in the context of
   [RFC7516], and [RFC7517].

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 Encryption

Amringer                Expires January 24, 2020                [Page 2]
Internet-Draft                                                 July 2019

2.1.  Algorithms

   This section defines the specifics of encrypting a JWE Content
   Encryption Key (CEK) with AEAD_CHACHA20_POLY1305 [RFC8439] and
   AEAD_XCHACHA20_POLY1305 [I-D.irtf-cfrg-xchacha].

   Use of an Initialization Vector (IV) is REQUIRED with this algorithm.
   The IV is represented in base64url-encoded form as the "iv"
   (initialization vector) Header Parameter value.

   The Additional Authenticated Data value used is the empty octet
   string.

   The JWE Encrypted Key value is the ciphertext output.

   The Authentication Tag output is represented in base64url-encoded
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