gpgme_op_keylist_start: error: Invalid crypto engine <GPGME>

Mon Oct 22 22:19:06 CEST 2012

On 10/22/2012 05:13 AM, Werner Koch wrote:
> Hi,
> 
> looking closer at the logs shows that none of the tools return any
> information for a call with EGNINE --version.
> 
>  <0x0391>  _gpgme_io_spawn: check: path=0x4a2ea798, argv[ 0] = /data/data/info.guardianproject.gpg/app_opt/bin/gpg2
>  <0x0391>  _gpgme_io_spawn: check: path=0x4a2ea798, argv[ 1] = --version
>  <0x0391>  _gpgme_io_spawn: check: path=0x4a2ea798, fd[0] = 0x26 -> 0x1
> 
> Setup everything for an exec.  Register to connect stdout of gpg2 to the
> pipe.
> 
>  <0x0391>  _gpgme_io_spawn: check: path=0x4a2ea798, waiting for child
>  process pid=941
> 
> Wait in the parent for gpg to finish.
> 
>  <0x03ae>    gpgme:max_fds: call: 0=0x0, max fds=1024 (RLIMIT_NOFILE)
> 
> The child is about to close all file descriptors.  Actually this is the
> grandchild because gpgme uses double forking to let init reap the
> children.
> 
>  <0x0391>    _gpgme_io_close: enter: fd=0x26
>  <0x0391>    _gpgme_io_close: leave: result=0
> 
> Close other end of the pipe in the parent.
> 
>  <0x0391>  _gpgme_io_spawn: leave: result=0
> 
> Finished.
> 
>  <0x0391>  _gpgme_io_read: enter: fd=0x25, buffer=0xbeac65e4, count=79
>  <0x0391>  _gpgme_io_read: leave: result=0
> 
> Read end of the pipe was called with a 79 byte buffer but returned
> nothing.  Here is what you should have seen between these two log lines:
> 
>  <0x0391>  _gpgme_io_read: check: 6770672028476e75 50472920312e342e gpg (GnuPG) 1.4
>  [...]
> 
> 
> I assume you already verified that 
> 
>  $ /data/data/info.guardianproject.gpg/app_opt/bin/gpg2 --version 

I have a menu item in the test Android app that downloads a key from a
keyserver using the gpg2 command line binary.  That has been working fine for
a while now.  In case you're curious, I ran this from 'adb shell', i.e. a
terminal to an Android emulator:

# export
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/data/data/info.guardianproject.gpg/app_opt/lib
# /data/data/info.guardianproject.gpg/app_opt/bin/gpg2 --version
gpg (GnuPG) 2.1.0-beta82
libgcrypt 1.6.0-git38fcd59
NOTE: THIS IS A DEVELOPMENT VERSION!
It is only intended for test purposes and should NOT be
used in a production environment or with production keys!
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Home: ~/.gnupg
Supported algorithms:
Pubkey: RSA, ELG, DSA, ECDH, ECDSA
Cipher: 3DES, CAST5, BLOWFISH, AES128, AES192, AES256, TWOFISH, CAMELLIA128,
        CAMELLIA192, CAMELLIA256
Hash: MD5, SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224
Compression: Uncompressed, ZIP, ZLIB

> return something to stdout.  The next step would be to enable the trace
> calls in  src/posix-io.c:gpgme_io_spawn .  The are all "#if 0"-ed to
> avoid problems with pthread.  Change the all to "#if 1" and check the
> logs again.

I'll run that now.

> How long would it take me to setup a test environment?  Does that make
> sense?

If you are interested in GnuPG on Android beyond just this problem, I think it
does make sense. If you are running a Debian-deriv, its not too bad to setup,
I think the whole thing might take no more than an hour, if you ignore the
Eclipse setup:

 apt-get install ia32-libs (only if running amd64 64-bit)
 apt-get install autoconf automake libtool transfig wget patch \
       texinfo ant gettext build-essential bison

 cd /path/to/folder/for/your/android/tools
 wget https://dl.google.com/android/ndk/android-ndk-r8b-linux-x86.tar.bz2
 tar xjf android-ndk-r8b-linux-x86.tar.bz2
 wget https://dl.google.com/android/android-sdk_r20.0.3-linux.tgz
 tar xjf android-sdk_r20.0.3-linux.tgz

I source a ~/.android/bashrc file to set the relevant vars for locating the
NDK and SDK, I attached the one I use.

Next you need to install setup an emulator, unless you have an Android phone
you want to use:
http://developer.android.com/sdk/installing/adding-packages.html  Then it
should just be:

 git clone https://github.com/guardianproject/gnupg-for-android
 cd gnupg-for-android
 . /path/to/your/android-bashrc
 make -C external/ distclean
 make -C external/ gnupg-install
 make -C external/ gnupg-static
 make -C external/ gpgme-install
 make -C external/ android-assets
 ndk-build
 android update project --path . --target android-8 --name GnuPrivacyGuard
 ant clean debug
 adb install bin/info.guardianproject.gpg.GnuPrivacyGuard.apk

.hc
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export NDK_BASE=/opt/android-ndk
export NDK_ROOT=$NDK_BASE
export NDK_TOOLCHAIN_BASE=${NDK_BASE}/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
export NDK_SYSROOT=$NDK_BASE/platforms/android-$NDK_PLATFORM_VERSION/arch-arm

export SDK_BASE=/opt/android-sdk
export SDK_ROOT=$SDK_BASE
export SDK_TOOLS=${SDK_BASE}/tools
export SDK_PLATFORM_TOOLS=${SDK_BASE}/platform-tools

export PATH="${PATH}:${NDK_BASE}:${NDK_TOOLCHAIN_BASE}/bin:${SDK_TOOLS}:${SDK_PLATFORM_TOOLS}"
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