[Buildroot] [patch] OCF cryptodev patchset

Brad House brad at mainstreetsoftworks.com
Thu Aug 30 02:41:15 UTC 2007

Patch: http://www.monetra.com/~brad/buildroot/ocf-linux.patch.bz2

This is a patchset to provide userland access to kernel
cryptographic interfaces.  This means that hardware crypto
accelerators supported by the kernel can now be utilized by
userland applications and libraries such as OpenSSL, OpenSwan,
and OpenSSH.

Reference: http://ocf-linux.sourceforge.net

The patchset also provides support for these additional
hardware crypto devices (which are not currently part
of the linux kernel):
	Hifn 7951
	Hifn 7956
	SafeNet SafeXcel 1741
	SafeNet SafeXcel 1142
	Intel IXP465
	Intel IXP425
	Intel IXP422
	Freescale SEC

Note: to take advantage of hardware crypto accelerators
already in the kernel (such as GeodeLX AES, or Via Padlock)
you must, counter-intuitively, enable the 'cryptosoft' feature
of OCF.  Also, don't forget to enable 'cryptodev' for userland

The kernel patchset is from the 20070727 release, but had
to be re-diffed to apply cleanly to

The openssl patchset included here is from the 20051110
release, which is the last release supporting the 0.9.7
series of OpenSSL which is what buildroot currently
provides.  Some minor manual patching was needed to make
this apply cleanly to 0.9.7m.

Since hardware cryptographic acceleration is becoming
common in embedded devices, it makes sense for buildroot
to support this natively.

On a Soekris net5501-60 (433MHz GeodeLX), with the built-in
GeodeLX AES accelerator, using openssl's speed test with and
without cryptodev, here are some statistics:

software, single-threaded:
openssl speed -evp aes128 -elapsed
 type             16 bytes     64 bytes    256 bytes   1024 bytes   8192
aes-128-cbc       3823.26k     4329.37k     4467.63k     4510.92k

hardware, single-threaded:
openssl speed -evp aes128 -engine cryptodev -elapsed
 type             16 bytes     64 bytes    256 bytes   1024 bytes   8192
aes-128-cbc       1359.10k     4837.19k    13548.04k    25759.01k

software, multi-threaded:
openssl speed -evp aes128 -elapsed -multi 10
 type             16 bytes     64 bytes    256 bytes   1024 bytes   8192
aes-128-cbc       3921.08k     4247.58k     4483.26k     4539.02k

hardware, multi-threaded:
openssl speed -evp aes128 -engine cryptodev -elapsed -multi 10
 type             16 bytes     64 bytes    256 bytes   1024 bytes   8192
aes-128-cbc       4058.10k    16153.17k    26851.91k    74207.78k

Obviously the hardware acceleration is a huge win for large block sizes.

I've bzip2'd the entire patch for size.
Please make sure the  toolchain/kernel-headers/ocf and
package/openssl/ocf  directory and contents get committed.

My first attempt to send this sent it as an attachment, I've uploaded
it now to my webserver so it can be downloaded since it was rejected
by the mailinglist for size:


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