tree 78c58d06f328d1342230efbb844a426502f6e8a9
parent 67e64342c1aa0b31b0b5c11e5ee21c481ce530e8
author David Benjamin <davidben@google.com> 1536007859 -0500
committer Adam Langley <agl@google.com> 1536100013 +0000

No negative moduli.

https://boringssl-review.googlesource.com/31085 wasn't right. We already forbid
creating BN_MONT_CTX on negative numbers, which means almost all moduli already
don't work with BN_mod_exp_mont. Only -1 happened to not get rejected, but it
computed the wrong value. Reject it instead.

Update-Note: BN_mod_exp* will no longer work for negative moduli. It already
didn't work for all negative odd moduli other than -1, so rejecting -1 and
negative evens is unlikely to be noticed.

Bug: 71
Change-Id: I7c713d417e2e6512f3e78f402de88540809977e3
Reviewed-on: https://boringssl-review.googlesource.com/31484
Reviewed-by: Adam Langley <agl@google.com>