1 files changed, 56 insertions, 0 deletions

diff --git a/docs/cryptography.md b/docs/cryptography.md
new file mode 100644
index 00000000..3a485df9
--- /dev/null
+++ b/docs/cryptography.md
@@ -0,0 +1,56 @@
+# Cryptograghy
+
+## OpenPGP
+
+To get Open PGP support we use GpgME >= 1.8.0. GpgME has now include Gpgme++ and QGpgME, that were living before in kdepim repositories.
+
+GpgME gives use directly PGP and SMime support and needs gpg-agent, gpg2, gpgsm and a pinentry to be installed to work correctly. The package names differ between the distributions on Fedora the are named gnupg2, gnupg2-smime and pinentry-qt (there are several different flavours for diffrent environments. I think the Qt flavour mathes best).
+
+gnupg using ~/.gnupg as default homedir to store every file it uses. In our test docker environment, we setup all relevat files and added keys without passphrase to test PGP/SMime support. We also incuded one key `With Passphrase "test" <passphrase@example.org>`, that has a phassphrase named `test`.
+
+You can get all keys with secret key available via `gpg2 --list-secret-keys` all known keys with `gpg2 --list-keys`.
+
+```
+$ gpg2 --list-secret-keys
+gpg: WARNING: unsafe permissions on homedir '/home/developer/.gnupg'
+gpg: enabled debug flags: memstat
+/home/developer/.gnupg/pubring.gpg
+----------------------------------
+sec   rsa2048 2009-11-13 [SC]
+      1BA323932B3FAA826132C79E8D9860C58F246DE6
+uid           [ultimate] unittest key (no password) <test@kolab.org>
+ssb   rsa2048 2009-11-13 [E]
+
+sec   rsa1024 2009-11-25 [SC]
+      00949E2AF4A985AFB572FDD214B79E26050467AA
+uid           [ultimate] kdetest <you@you.com>
+ssb   rsa1024 2009-11-25 [E]
+
+sec   rsa1024 2009-11-25 [SC]
+      CA739AC832766152139B5C49FC4FAB94C727D4BB
+uid           [ultimate] kde testing <bcc@bcc.org>
+ssb   rsa1024 2009-11-25 [E]
+
+sec   rsa2048 2016-11-22 [SC]
+      4F7EE48F586A13D1397E91D270057E539B9DE64B
+uid           [ultimate] With Passphrase "test" <passphrase@example.org>
+ssb   rsa2048 2016-11-22 [E]
+```
+
+### Testing OpenPGP support
+
+We have many testmails, that are signed and encrypted with keys without a passphrase.
+
+All testmails can be found in the folder [github:cmollekopf/docker](https://github.com/cmollekopf/docker/tree/master/kube/testmails/cur).
+
+* With `openpgp-` prefix are PGP/Mime messages [RFC 3156](https://tools.ietf.org/html/rfc3156).
+* With `openpgp-inline-` prefix are PGP inline messages [RFC 4880](https://tools.ietf.org/html/rfc4880).
+* With `smime-` prefix are SMIME messages [RFC 2633](https://tools.ietf.org/html/rfc2633).
+
+To be able to also test gpg errors, we created some test mails, that triggers known issues:
+
+* `openpgp-keymissing.mbox` this key is missing in the test environment, so gpg returns a KeyMissing error.
+* `openpgp-wrong_passphrase.mbox`, here a pinentry popups and if you press three time `Cancel` in a row, a Passphrase error is returnd. If you enter the correct passphrase `test` you the the content of the mail. But than you need wither restart the testenvironment, kill `gpg-agent` or simply wait 1h before you see the passphrase error again.
+* you can unistall the `gnupg-smime` package, or delete `/usr/bin/gpgsm` by hand to trigger a UnknownError for smime encrypted messages. If delete all `gnupgp2` related pacakges the application may react with segfaults.
+
+We also have a unittest for gnupg errors in a lower level [kde:kube/framework/domain/mimetreeparser/tests/gpgerrortest.cpp](https://cgit.kde.org/kube.git/tree/framework/domain/mimetreeparser/tests/gpgerrortest.cpp?h=develop).