Description:

With OpenSSL 0.9.6, a new component was added to support alternative
cryptography implementations, most commonly for interfacing with external
crypto devices (eg. accelerator cards). This component is called ENGINE,
and its presence in OpenSSL 0.9.6 (and subsequent bug-fix releases) caused
a little confusion as 0.9.6** releases were rolled in two versions,
a "standard" and an "engine" version. In development for 0.9.7, the
ENGINE code has been merged into the main branch and will be present in
the standard releases from 0.9.7 forwards.

There are currently built-in ENGINE implementations for the following
crypto devices:

o CryptoSwift
o Compaq Atalla
o nCipher CHIL
o Nuron
o Broadcom uBSec

In addition, dynamic binding to external ENGINE implementations is now
provided by a special ENGINE called "dynamic".