commit e21154fe31fcf9cebe5163c53b6695cfedccac34
author ALTree <alb.donizetti@gmail.com> Mon Apr 06 21:18:37 2015 +0200
committer Robert Griesemer <gri@golang.org> Tue Apr 07 21:04:09 2015 +0000
tree 9c84e1f529a06927d478b179cf54fc9e5083d10f
parent 0c8fe3463fe5dc49361d7fdcaa2a4d23a38c3151

math/big: fix Exp when exponent is 1

Fixed bug that caused Exp(x, y, m) ( i.e. x**y (mod m) ) to return x
instead of x (mod m) when y == 1. See issue page on github for more
details.

Added test case

Fixes #9826

Change-Id: Ibabb58275a20c4231c9474199b7f1c10e54241ce
Reviewed-on: https://go-review.googlesource.com/8409
Reviewed-by: Robert Griesemer <gri@golang.org>

src/math/big/int_test.go

diff --git a/src/math/big/int_test.go b/src/math/big/int_test.go
index a972a72..fa4ae2d 100644
--- a/src/math/big/int_test.go
+++ b/src/math/big/int_test.go
@@ -525,6 +525,7 @@
 	{"1234", "-1", "1", "0"},
 
 	// misc
+	{"5", "1", "3", "2"},
 	{"5", "-7", "", "1"},
 	{"-5", "-7", "", "1"},
 	{"5", "0", "", "1"},