Beyond Linux® From Scratch (System V Edition) - Version r12.2-743

Chapter 4. Security

GPGME-1.24.0

Introduction to GPGME

The GPGME package is a C library that allows cryptography support to be added to a program. It is designed to make access to public key crypto engines like GnuPG or GpgSM easier for applications. GPGME provides a high-level crypto API for encryption, decryption, signing, signature verification and key management.

[Note]

Note

Development versions of BLFS may not build or run some packages properly if LFS or dependencies have been updated since the most recent stable versions of the books.

Package Information

GPGME Dependencies

Required

libassuan-3.0.1

Optional

Doxygen-1.12.0 and Graphviz-12.2.0 (for API documentation), GnuPG-2.4.7 (required if Qt or SWIG are installed; used during the test suite), Clisp-2.49, and SWIG-4.3.0 (for language bindings)

Installation of GPGME

Install GPGME by running the following commands: 

mkdir build &&
cd    build &&

../configure --prefix=/usr --disable-gpg-test &&
make PYTHONS=

If SWIG-4.3.0 is installed, build the Python 3 binding as a wheel: 

if swig -version > /dev/null; then
  srcdir=$PWD/../lang/python \
  top_builddir=$PWD          \
  pip3 wheel -w dist --no-build-isolation --no-deps --no-cache-dir $PWD/lang/python
fi

To test the results, you should have GnuPG-2.4.7 installed and remove the --disable-gpg-test above. Issue: 

make -k check PYTHONS= PYTHON=$PWD/testenv/bin/python3

Now, as the root user: 

make install PYTHONS=

If SWIG-4.3.0 is installed, still as the root user, install the Python 3 binding: 

if swig -version > /dev/null; then
  pip3 install --no-index --find-links=dist --no-cache-dir --no-user gpg
fi

Command Explanations

--disable-gpg-test: if this parameter is not passed to configure, the test programs are built during make stage, which requires GnuPG-2.4.7. This parameter is not needed if GnuPG-2.4.7 is installed.

PYTHONS=: Disable building Python binding using the deprecated python3 setup.py build command. The explicit instruction to build the Python 3 binding with the pip3 wheel command is provided.

Contents

Installed Program: gpgme-json, and gpgme-tool
Installed Libraries: libgpgme.so, libgpgmepp.so, and libqgpgme.so
Installed Directory: /usr/include/{gpgme++,qgpgme,QGpgME}, /usr/lib/cmake/{Gpgmepp,QGpgme}. /usr/lib/python3.13/site-packages/gpg{,-1.24.0.dist-info}, and /usr/share/common-lisp/source/gpgme

Short Descriptions

gpgme-json

outputs GPGME commands in JSON format

gpgme-tool

is an assuan server exposing GPGME operations, such as printing fingerprints and keyids with keyservers

libgpgme.so

contains the GPGME API functions

libgpgmepp.so

contains the C++ GPGME API functions

libqgpgme.so

contains API functions for handling GPG operations in Qt applications