tree 3e07bb5713a1fac9d022939d7822a3e94ac15f08
parent fc27a1919cf14a834f41f01228cb997a90ed25c1
author David Benjamin <davidben@google.com> 1548056433 +0000
committer Adam Langley <agl@google.com> 1548199654 +0000

Fix signed left-shifts in curve25519.c.

Due to a language flaw in C, left-shifts on signed integers are
undefined for negative numbers. This makes them all but useless. Cast to
the unsigned type, left-shift, and cast back (casts are defined to wrap)
to silence UBSan.

Change-Id: I8fbe739aee1c99cf553462b675863e6d68c2b302
Reviewed-on: https://boringssl-review.googlesource.com/c/34446
Reviewed-by: Adam Langley <agl@google.com>