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Brian Kessler 4d44a87243 math/big: return nil for nonexistent ModInverse 
Currently, the behavior of z.ModInverse(g, n) is undefined
when g and n are not relatively prime.  In that case, no
ModInverse exists which can be easily checked during the
computation of the ModInverse.  Because the ModInverse does
not indicate whether the inverse exists, there are reimplementations
of a "checked" ModInverse in crypto/rsa.  This change removes the
undefined behavior.  If the ModInverse does not exist, the receiver z
is unchanged and the return value is nil. This matches the behavior of
ModSqrt for the case where the square root does not exist.

name          old time/op    new time/op    delta
ModInverse-4    2.40µs ± 4%    2.22µs ± 0%   -7.74%  (p=0.016 n=5+4)

name          old alloc/op   new alloc/op   delta
ModInverse-4    1.36kB ± 0%    1.17kB ± 0%  -14.12%  (p=0.008 n=5+5)

name          old allocs/op  new allocs/op  delta
ModInverse-4      10.0 ± 0%       9.0 ± 0%  -10.00%  (p=0.008 n=5+5)

Fixes #24922

Change-Id: If7f9d491858450bdb00f1e317152f02493c9c8a8
Reviewed-on: https://go-review.googlesource.com/108996
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2018-04-30 23:45:27 +00:00
.github github: update Pull Request template 2018-02-21 02:07:46 +00:00
api syscall: introduce Pointer type and use it instead of uintptr 2018-04-18 08:50:42 +00:00
doc doc: document Go 1.10.2 2018-04-30 18:01:00 +00:00
lib/time all: use HTTPS for iana.org links 2018-02-13 18:36:48 +00:00
misc misc/ios: script lldb directly with Python 2018-04-30 16:17:42 +00:00
src math/big: return nil for nonexistent ModInverse 2018-04-30 23:45:27 +00:00
test all: skip unsupported tests for js/wasm 2018-04-30 19:39:18 +00:00
.gitattributes
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: update email address 2018-04-14 19:28:37 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: add Iskander Sharipov's individual CLA mail 2018-04-16 04:49:46 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
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README.md README: update number of contributors 2018-04-03 22:10:32 +00:00
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