Implementations different from GnuPG that aim for OpenPGP compliance.
OpenPGP.js
License: GNU LGPL v>=2.1.
used by:
- https://www.mailvelope.com/ (License GNU Affero v==3) for Webmail -- extensions for Chrome/Chromium & Firefox
- Mymail-Crypt for Gmail (License: GNU GPL v>=2) -- extension for Chrome/Chromium
Completeness: ?
Compatibility: ?
kbpgp
https://github.com/keybase/kbpgp
Keybase's PGP for JS claims: Public-key crypto and improvements to OpenPGP.js
| License | X11-style |
| Programming Language/Environment | Iced Coffescript compiling to Javascript |
| Completeness | ? |
| Compatibility | ? |
| Used by | https://keybase.io/ (likely), though keybase also claims to use GnuPG and maintains a GnuPG-wapper module |
NetPGP
| License | X11-style |
| Programming Language/Environment | C based on https://github.com/public/OpenPGP-SDK/ which based on OpenSSL |
| Completeness | [2] has: NetPGP is useful but does not make up a full competitor to GnuPG. |
| Compatibility | ? |
| Used by | ? |
The latest versions offered on the website are from February 2014 and 2015 (last checked 2018-01-04).
NeoPG
From the website: NeoPG starts as an opiniated fork of GnuPG 2 to clean up the code and make it easier to develop.
| License | GNU GPL v3 (and others like GnuPG) |
| Programming Language/Environment | C moving to C++ |
| Completeness | ? |
| Compatibility | (probably good because started as fork of GnuPG 2) |
| Used by | ? |
Chromium Extension End-to-End
https://code.google.com/p/end-to-end/
| License | Apache 2.0 |
| Programming Language/Environment | Javascript, Chromium Extension |
Completeness: ? Claims to only create ECC certificates (which curve parameters?)
Compatibility: ?
- Google announced a Chromium extension that supports OpenPGP, see http://googleonlinesecurity.blogspot.de/2014/06/making-end-to-end-encryption-easier-to.html
- Heise newsarticle in DE: http://www.heise.de/newsticker/meldung/Google-experimentiert-mit-End-to-End-Verschluesselung-fuer-GMail-2215680.html
Android Privacy Guard
http://thialfihar.org/projects/apg/
| License | GPL 3+ |
| Programming Language/Environment | Java, Android SDK |
Completeness: ?
Compatibility: ?
Integrates with the K-9 Mailer.
Seems to be unmaintained (last release 2014-03, some known vulnerabilities unfixed since (status 2016-04)) with OpenKeychain being the activeley maintained "fork", see ~OpenKeychain FAQ: relation to APG
OpenPGP-Keychain
http://www.openkeychain.org/about/ , Fork of APG. Uses Bouncy Castle.
| License | GPL 3+ |
| Programming Language/Environment | Java, Android SDK |
Completeness: ?
Compatibility: ?
Integrates with the K-9 Mailer.
Bouncy Castle
https://en.wikipedia.org/wiki/Bouncy_Castle_(cryptography) (Homepage with ads: https://bouncycastle.org/)
| License | MIT |
| Programming Language/Environment | Java |
Completeness: ?
Compatibility: ?
hOpenPGP
http://hackage.haskell.org/package/hOpenPGP
native Haskell implementation of OpenPGP (RFC4880), plus Camellia (RFC5581)
| License | MIT |
| Programming Language/Environment | Haskell |
Discussion
- https://news.ycombinator.com/item?id=7843297 Discussion about OpenPGP.js codequality and choice of reimplementation in End-to-End.
- [2] https://lwn.net/Articles/742542/ (subscriber contents to become generally available 10th of January, 2018) Future directions for PGP, January 3, 2018 by J. B. Crawford, lists NetPGP and NeoPGP.