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Using OpenBSD Problem-Solving Resources
Let's pick a common question and use the OpenBSD resources to solve it. We'll use several different methods to find an answer. One topic that comes up frequently is that of hardware-accelerated cryptography: how does it work, and what does OpenBSD do to support it? Here's how you find information on this topic from each of the information sources the OpenBSD Project provides.
www.OpenBSD.org
If you look at the main page of the OpenBSD website, you'll find a link pointing to "Integrated Crypto." That leads you in turn to "Cryptographic Hardware Support." Read, learn, and enjoy.
Man Pages
If you just type "man cryptography" you won't get any matches; there is no "cryptography" man page. It's frequently called "crypto," however, and if you try "man crypto" you'll get something.
crypto(3) OpenSSL crypto(3)
NAME
crypto - OpenSSL cryptographic library
SYNOPSIS
DESCRIPTION
The OpenSSL crypto library implements a wide range of
cryptographic algorithms used in various Internet stan-
dards. The services provided by this library are used by
the OpenSSL implementations of SSL, TLS and S/MIME, and
they have also been used to implement SSH, OpenPGP, and
other cryptographic standards.
OVERVIEW
libcrypto consists of a number of sub-libraries that
...
Well, that's not what we want. It's nice to have OpenSSL documentation on a system that includes OpenSSL, but it doesn't answer our question. You might give up here, but that's not what you want to do either. Notice that this manual this page falls in Section 3. Information on hardware belongs in Section 4 of the manual. When multiple man pages share a name, and you don't give man(1) a section number, the page in the lowest section number is displayed. Try "apropos crypto" to look for all the man pages that include the word "crypto." You'll notice the following....
crypto (3) - OpenSSL cryptographic library
crypto (4) - hardware crypto access driver
crypto (9) - API for cryptographic services in the kernel
...
There are three different crypto man pages, each in a different section. Crypto(3) is for programmers who want to use the OpenSSL cryptographic interface; crypto(9) is for programmers who want to access crypto routines within the kernel; and crypto(4) is for cryptographic accelerator hardware. Type "man 4 crypto" and you'll see what you want.
CRYPTO(4) OpenBSD Programmer's Manual CRYPTO(4)
NAME
crypto - hardware crypto access driver
SYNOPSIS
pseudo-device crypto [count]
DESCRIPTION
The crypto driver provides userland applications access to hardware cryp-
to support via the kernel. The /dev/crypto device node primarily oper-
ates in an ioctl(2) based model, permitting a variety of applications to
query device capabilities, submit transactions, and get results.
If count given in the specification, and is greater than 0, a maximum of
...
You may have to wade through some dense technical information, but everything you need to know is right here.
Checking the Internet
Go to Google and enter "OpenBSD crypto hardware support." On the day I wrote this, the first page of results gave me a direct link to the relevant OpenBSD web page, a link to a mailing list archive result, and a couple of third-party web pages discussing OpenBSD's hardware crypto support.
