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[[!comment format=mdwn
username="http://joeyh.name/"
ip="4.154.7.235"
subject="comment 2"
date="2013-07-08T19:57:10Z"
content="""
Based on <http://pthree.org/2009/06/08/gnupg-up-and-close/> and <http://www.faqs.org/rfcs/rfc4880.html>, symmetric encryption algorithm 3 is CAST5.
When I run `gpg -v --version` on Android, I get a very short list of Cipher algorithms, just \"3DES (S2)\".
Compare with on Linux, where it supports:
<pre>
Cipher: 3DES (S2), CAST5 (S3), BLOWFISH (S4), AES (S7), AES192 (S8),
AES256 (S9), TWOFISH (S10), CAMELLIA128 (S11), CAMELLIA192 (S12),
CAMELLIA256 (S13)
</pre>
I suspect that you guys have a gpg on your non-android side that either defaults to CAST5, or has been configured, via the default-preference-list setting in gpg.conf, to use it. It should be possible to adjust your gpg.conf to use 3DES by default, and then things will interoperate (anything already encrypted by git-annex still won't be visible on Android of course).
The gpg shipped with git-annex on Android could be rebuilt to include these. However, it would probably need porting of more libraries to Android. I stopped once I got gpg to compile at all, and had to pass several configure flags to disable features,
This is something that anyone interested could work on. (Ie, no Haskell!) See `standalone/android/Makefile` in the git-annex source tree, which uses the Android SDK and NDK to cross-compile gnupg for Android.
I think that getting it to build without `--enable-minimal` would probably get most of the way there. Aha.. I just tried this, and the new binary seems to support nearly everything the linux one does, no extra libraries needed!
"""]]
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