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aesni — driver for the AES accelerator on Intel CPUs
To compile this driver into the kernel, place the following lines in your
kernel configuration file:
Alternatively, to load the driver as a module at boot time, place the
following line in loader.conf(5):
Starting with some models of Core i5/i7, Intel processors implement a new
set of instructions called AESNI. The set of six instructions
accelerates the calculation of the key schedule for key lengths of 128,
192, and 256 of the Advanced Encryption Standard (AES) symmetric cipher,
and provides a hardware implementation of the regular and the last
encryption and decryption rounds.
The processor capability is reported as AESNI in the Features2 line at
boot. The aesni driver does not attach on systems that lack the required
The aesni driver registers itself to accelerate AES operations for
crypto(4). Besides speed, the advantage of using the aesni driver is
that the AESNI operation is data-independent, thus eliminating some
attack vectors based on measuring cache use and timings typically present
in table-driven implementations.
crypt(3), crypto(4), intro(4), ipsec(4), padlock(4), random(4), crypto(9)
The aesni driver first appeared in FreeBSD 9.0.
The aesni driver was written by Konstantin Belousov ⟨kib@FreeBSD.org⟩.
The key schedule calculation code was adopted from the sample provided by
Intel and used in the analogous OpenBSD driver.