Rename undocumented `HACL_CAN_COMPILE_SIMD{128,256}` macros
to `_Py_HACL_CAN_COMPILE_VEC{128,256}`. These macros are private.
(cherry picked from commit 1e975aee28)
gh-135561: ensure that the GIL is held when handling an HACL* error in `_hmac` (GH-135562)
(cherry picked from commit c765683398)
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
A new extension module, `_hmac`, now exposes the HACL* HMAC (formally verified) implementation.
The HACL* implementation is used as a fallback implementation when the OpenSSL implementation of HMAC
is not available or disabled. For now, only named hash algorithms are recognized and SIMD support provided
by HACL* for the BLAKE2 hash functions is not yet used.
