Expand description
CPU feature detection.
Lives in ic-core so that both the implementation crates and the ontology
can consult it without either depending on the other: ic-cipher uses it to
pick a backend, and ic-ontology uses it to tell an agent which backend is
live.
Detection is compile-time when the feature is already enabled for the build
(-C target-cpu=native, or an explicit -C target-feature=+aes), and
runtime otherwise. Under no_std only the compile-time path exists, because
runtime detection needs std.
Every query here depends only on the CPU, never on key material, so none of it is a side channel.
Functionsยง
- has_aes
- Whether x86 AES-NI is available.
- has_
ghash_ clmul - Whether GHASH will run on the carry-less multiply in this build.
- has_
pclmulqdq - Whether carry-less multiplication (
PCLMULQDQ) is available.