JSON Web Encryption (JWE)
draft-ietf-jose-json-web-encryption-02

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Document Type Active Internet-Draft (jose WG)
Last updated 2012-05-12
Replaces draft-jones-json-web-encryption
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JOSE Working Group                                              M. Jones
Internet-Draft                                                 Microsoft
Intended status: Standards Track                             E. Rescorla
Expires: November 13, 2012                                          RTFM
                                                           J. Hildebrand
                                                                   Cisco
                                                            May 12, 2012

                       JSON Web Encryption (JWE)
                 draft-ietf-jose-json-web-encryption-02

Abstract

   JSON Web Encryption (JWE) is a means of representing encrypted
   content using JSON data structures.  Cryptographic algorithms and
   identifiers used with this specification are enumerated in the
   separate JSON Web Algorithms (JWA) specification.  Related digital
   signature and MAC capabilities are described in the separate JSON Web
   Signature (JWS) specification.

Requirements Language

   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 RFC 2119 [RFC2119].

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
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 13, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Jones, et al.           Expires November 13, 2012               [Page 1]
Internet-Draft                     JWE                          May 2012

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Jones, et al.           Expires November 13, 2012               [Page 2]
Internet-Draft                     JWE                          May 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  JSON Web Encryption (JWE) Overview . . . . . . . . . . . . . .  6
     3.1.  Example JWE with an Integrated Integrity Check . . . . . .  6
     3.2.  Example JWE with a Separate Integrity Check  . . . . . . .  7
   4.  JWE Header . . . . . . . . . . . . . . . . . . . . . . . . . .  8
     4.1.  Reserved Header Parameter Names  . . . . . . . . . . . . .  8
       4.1.1.  "alg" (Algorithm) Header Parameter . . . . . . . . . .  9
       4.1.2.  "enc" (Encryption Method) Header Parameter . . . . . .  9
       4.1.3.  "int" (Integrity Algorithm) Header Parameter . . . . .  9
       4.1.4.  "iv" (Initialization Vector) Header Parameter  . . . . 10
       4.1.5.  "epk" (Ephemeral Public Key) Header Parameter  . . . . 10
       4.1.6.  "zip" (Compression Algorithm) Header Parameter . . . . 10
       4.1.7.  "jku" (JWK Set URL) Header Parameter . . . . . . . . . 10
       4.1.8.  "jwk" (JSON Web Key) Header Parameter  . . . . . . . . 10
       4.1.9.  "x5u" (X.509 URL) Header Parameter . . . . . . . . . . 11
       4.1.10. "x5t" (X.509 Certificate Thumbprint) Header
               Parameter  . . . . . . . . . . . . . . . . . . . . . . 11
       4.1.11. "x5c" (X.509 Certificate Chain) Header Parameter . . . 11
       4.1.12. "kid" (Key ID) Header Parameter  . . . . . . . . . . . 12
       4.1.13. "typ" (Type) Header Parameter  . . . . . . . . . . . . 12
     4.2.  Public Header Parameter Names  . . . . . . . . . . . . . . 12
     4.3.  Private Header Parameter Names . . . . . . . . . . . . . . 12
   5.  Message Encryption . . . . . . . . . . . . . . . . . . . . . . 13
   6.  Message Decryption . . . . . . . . . . . . . . . . . . . . . . 14
   7.  Key Derivation . . . . . . . . . . . . . . . . . . . . . . . . 15
   8.  CMK Encryption . . . . . . . . . . . . . . . . . . . . . . . . 16
     8.1.  Asymmetric Encryption  . . . . . . . . . . . . . . . . . . 16
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