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libcrypto: Work around strict aliasing violations in bn_nist.c
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Authored by jrtc27 on Jul 24 2022, 1:24 AM.

Details

Summary

This file is full of strict aliasing violations. Previously it was only
optimised in ways that broke the code by CHERI LLVM, but now it appears
that the in-tree LLVM also breaks it for RISC-V, resulting in broken
ECDSA signature validation with error messages like the following:

root@unmatched:/usr/src # ssh-keygen -l -f /etc/ssh/ssh_host_ecdsa_key
/etc/ssh/ssh_host_ecdsa_key is not a key file.
root@unmatched:/usr/src # git fetch
fatal: unable to access 'https://git.FreeBSD.org/src.git/': error:1012606B:elliptic curve routines:EC_POINT_set_affine_coordinates:point is not on curve

Obtained from: CheriBSD
MFC after: 1 week

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Repository
rG FreeBSD src repository
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