robbat2@gentoo.org Robin H. Johnson af_alg implements an OpenSSL engine that uses the AF_ALG functionailty found in kernel >= 2.6.38 for crypto offload. Be sure to actually check if it's faster, as for many modern systems, userspace software implementations are actually faster, as they avoid a kernel context switch. However, on embedded systems and others with crypto hardware, AF_ALG may be faster. The homepage has more details.