tree 4c582e4e66a444be78203c5f3e172555dc081595
parent aeb69a02b833994766f0af1f4d84929f7496d7f6
author Adam Langley <agl@google.com> 1456847650 -0800
committer Adam Langley <agl@google.com> 1456855389 +0000

Make copy_from_prebuf constant time.

(Imported from upstream's 708dc2f1291e104fe4eef810bb8ffc1fae5b19c1.)

Performance penalty varies from platform to platform, and even key
length. For rsa2048 sign it was observed to reach almost 10%.

This is part of the fix for CVE-2016-0702.

Change-Id: Ie0860bf3e531196f03102db1bc48eeaf30ab1d58
Reviewed-on: https://boringssl-review.googlesource.com/7241
Reviewed-by: Adam Langley <agl@google.com>