The
qat_c2xxx
driver implements
crypto(4)
support for some of the cryptographic acceleration functions of the Intel
QuickAssist (QAT) device found on Atom C2000 devices.
QAT devices are enumerated through PCIe and are thus visible in
pciconf(8)
output.
The
qat_c2xxx
driver can accelerate AES in CBC, CTR, and GCM modes,
and can perform authenticated encryption combining the CBC, and CTR modes
with SHA1-HMAC and SHA2-HMAC.
The
qat_c2xxx
driver can also compute SHA1 and SHA2 digests.
The implementation of AES-GCM has a firmware-imposed constraint that the length
of any additional authenticated data (AAD) must not exceed 240 bytes.
The driver thus rejects
crypto(9)
requests that do not satisfy this constraint.
