Hello - I have a kernel.org repo set up now: https://git.kernel.org/cgit/linux/kernel/git/martineau/linux.git/ The "ell-key-crypto" branch has the patches to enable Diffie-Hellman and AF_ALG akcipher operations. I will force-push to this branch as the various patch sets are updated, so if you use this branch as a basis for your own development you will have to rebase periodically. To build for your environment, copy your system's current kernel config in to your kernel working directory and update the kernel configuration: $ cp /boot/config-<recent kernel-version> .config $ make olddefconfig $ scripts/config --enable CONFIG_KEY_DH_OPERATIONS $ scripts/config --enable CONFIG_CRYPTO_USER_API_AKCIPHER $ make olddefconfig The second "make olddefconfig" gives the Kbuild system a chance to check dependencies. $ make -j$(nproc) bzImage $ make -j$(nproc) modules $ sudo make modules_install $ sudo make install I've used this approach with the 4.5 kernel and Fedora 23. I'd expect things to work smoothly with configs from kernel 4.2/4.3 or newer, but as you go older than that we'll have to see how things go. ELL knows how to use the Diffie-Hellman functionality in the above kernel. I'm working on keyring patches that include certificate validation, and updating the ELL cipher functions to use the above kernel. -- Mat Martineau Intel OTC