HIFN(4) | Device Drivers Manual | HIFN(4) |
hifn
— Hifn
7751/7951/7811/7955/7956 crypto accelerator
hifn* at pci? dev ? function ?
The hifn
driver supports various cards
containing the Hifn 7751, 7951, 7811, 7955, and 7956 chipsets, such as
The hifn
driver registers itself to
accelerate DES, Triple-DES, AES (7955 and 7956 only), ARC4, MD5, MD5-HMAC,
SHA1, and SHA1-HMAC operations for
opencrypto(9), and thus
for ipsec(4) and
crypto(4).
The Hifn 7951, 7811, 7955, and 7956 may also supply data to the kernel rnd(4) subsystem.
The hifn
device driver appeared in
OpenBSD 2.7. The hifn
device
driver was imported to FreeBSD 5.0, back-ported to
FreeBSD 4.8, and subsequently imported into
NetBSD 2.0.
The Hifn 9751 shares the same PCI ID. This chip is basically a 7751, but with the cryptographic functions missing. Instead, the 9751 is only capable of doing compression. Since we do not currently attempt to use any of these chips to do compression, the 9751-based cards are not useful.
Support for the 7955 and 7956 is incomplete; the asymmetric crypto facilities are to be added and the performance is suboptimal.
The 7751 chip starts out at initialization by only supporting compression. A proprietary algorithm, which has been reverse engineered, is required to unlock the cryptographic functionality of the chip. It is possible for vendors to make boards which have a lock ID not known to the driver, but all vendors currently just use the obvious ID which is 13 bytes of 0.
June 13, 2018 | NetBSD 10.99 |