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
  - Invertex AEON
- No longer being made. Came as 128KB SRAM model, or 2MB DRAM model.
- Hifn 7751
- Reference board with 512KB SRAM.
- PowerCrypt
- Comes with 512KB SRAM.
- XL-Crypt
- Only board based on 7811 (which is faster than 7751 and has a random
      number generator).
- NetSec 7751
- Supports the most IPsec sessions, with 1MB SRAM.
- Soekris Engineering vpn1201 and vpn1211
- Contains a 7951 and supports symmetric and random number operations.
- Soekris Engineering vpn1401 and vpn1411
- Contains a 7955 and supports symmetric and random number operations.
 
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.