tree a448a08f1b7f81ba5352af8ed38c3d3ac0b5e8aa
parent 3b3e12d81ee52ee293b4a2dc4f416b209188e744
author David Benjamin <davidben@google.com> 1516942595 -0500
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1517885254 +0000

Make bn_sqr_recursive constant-time.

We still need BN_mul and, in particular, bn_mul_recursive will either
require bn_abs_sub_words be generalized or that we add a parallel
bn_abs_sub_part_words, but start with the easy one.

While I'm here, simplify the i and j mess in here. It's patterned after
the multiplication one, but can be much simpler.

Bug: 234
Change-Id: If936099d53304f2512262a1cbffb6c28ae30ccee
Reviewed-on: https://boringssl-review.googlesource.com/25325
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>