OpenPGP Message Format
draft-ietf-openpgp-rfc4880bis-08
Network Working Group W. Koch
Internet-Draft GnuPG e.V.
Obsoletes: 4880, 5581, 6637 (if B. Carlson
approved)
Intended status: Standards Track R. Tse
Expires: March 9, 2020 Ribose
D. Atkins
D. Gillmor
September 6, 2019
OpenPGP Message Format
draft-ietf-openpgp-rfc4880bis-08
Abstract
{ Work in progress to update the OpenPGP specification from RFC4880 }
This document specifies the message formats used in OpenPGP. OpenPGP
provides encryption with public-key or symmetric cryptographic
algorithms, digital signatures, compression and key management.
This document is maintained in order to publish all necessary
information needed to develop interoperable applications based on the
OpenPGP format. It is not a step-by-step cookbook for writing an
application. It describes only the format and methods needed to
read, check, generate, and write conforming packets crossing any
network. It does not deal with storage and implementation questions.
It does, however, discuss implementation issues necessary to avoid
security flaws.
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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
Koch, et al. Expires March 9, 2020 [Page 1]
Internet-Draft OpenPGP Message Format September 2019
This Internet-Draft will expire on March 9, 2020.
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
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
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to this document. Code Components extracted from this document must
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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1. Terms . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2. General functions . . . . . . . . . . . . . . . . . . . . . . 6
2.1. Confidentiality via Encryption . . . . . . . . . . . . . 7
2.2. Authentication via Digital Signature . . . . . . . . . . 8
2.3. Compression . . . . . . . . . . . . . . . . . . . . . . . 8
2.4. Conversion to Radix-64 . . . . . . . . . . . . . . . . . 8
2.5. Signature-Only Applications . . . . . . . . . . . . . . . 9
3. Data Element Formats . . . . . . . . . . . . . . . . . . . . 9
3.1. Scalar Numbers . . . . . . . . . . . . . . . . . . . . . 9
3.2. Multiprecision Integers . . . . . . . . . . . . . . . . . 9
3.3. Key IDs . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4. Text . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.5. Time Fields . . . . . . . . . . . . . . . . . . . . . . . 10
3.6. Keyrings . . . . . . . . . . . . . . . . . . . . . . . . 10
3.7. String-to-Key (S2K) Specifiers . . . . . . . . . . . . . 10
3.7.1. String-to-Key (S2K) Specifier Types . . . . . . . . . 10
3.7.2. String-to-Key Usage . . . . . . . . . . . . . . . . . 13
4. Packet Syntax . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2. Packet Headers . . . . . . . . . . . . . . . . . . . . . 14
4.2.1. Old Format Packet Lengths . . . . . . . . . . . . . . 15
4.2.2. New Format Packet Lengths . . . . . . . . . . . . . . 15
4.2.3. Packet Length Examples . . . . . . . . . . . . . . . 17
4.3. Packet Tags . . . . . . . . . . . . . . . . . . . . . . . 17
5. Packet Types . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1. Public-Key Encrypted Session Key Packets (Tag 1) . . . . 18
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