tree 230e01a9806d3fe17a953e7616acaa4f01675591
parent fe5f7c7b56e1d54478d2983c26153ead80e0322a
author David Benjamin <davidben@chromium.org> 1450802473 -0500
committer Adam Langley <agl@google.com> 1450827022 +0000

Fix a ** 0 mod 1 = 0 for real this time.

Commit 2b0180c37fa6ffc48ee40caa831ca398b828e680 attempted to do this but
only hit one of many BN_mod_exp codepaths. Fix remaining variants and
add a test for each method.

Thanks to Hanno Boeck for reporting this issue.

(Imported from upstream's 44e4f5b04b43054571e278381662cebd3f3555e6.)

Change-Id: Ic691b354101c3e9c3565300836fb6d55c6f253ba
Reviewed-on: https://boringssl-review.googlesource.com/6820
Reviewed-by: Adam Langley <agl@google.com>