Chacha derived AEAD algorithms in JSON Object Signing and Encryption (JOSE)
draft-amringer-jose-chacha-00

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(No Working Group)                                           G. Amringer
Internet-Draft                                               Independent
Intended status: Informational                          November 7, 2018
Expires: May 11, 2019

  Chacha derived AEAD algorithms in JSON Object Signing and Encryption
                                 (JOSE)
                     draft-amringer-jose-chacha-00

Abstract

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

Status of This Memo

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   This Internet-Draft will expire on May 11, 2019.

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   document authors.  All rights reserved.

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Amringer                  Expires May 11, 2019                  [Page 1]
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Notation and Conventions  . . . . . . . . . . . . . . . .   2
   2.  Key Management  . . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  Algorithms  . . . . . . . . . . . . . . . . . . . . . . .   2
     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.  Content Encryption  . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Algorithms  . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

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.arciszewski-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 Management

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.arciszewski-xchacha]).

Amringer                  Expires May 11, 2019                  [Page 2]
Internet-Draft                                             November 2018

   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
   form as the "tag" (authentication tag) Header Parameter value.

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