809N/A/*
2362N/A * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved.
809N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
809N/A *
809N/A * This code is free software; you can redistribute it and/or modify it
809N/A * under the terms of the GNU General Public License version 2 only, as
809N/A * published by the Free Software Foundation.
809N/A *
809N/A * This code is distributed in the hope that it will be useful, but WITHOUT
809N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
809N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
809N/A * version 2 for more details (a copy is included in the LICENSE file that
809N/A * accompanied this code).
809N/A *
809N/A * You should have received a copy of the GNU General Public License version
809N/A * 2 along with this work; if not, write to the Free Software Foundation,
809N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
809N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
809N/A */
809N/A
809N/A/* @test
809N/A * @bug 4181191
809N/A * @summary test BigInteger modPow method
809N/A */
809N/Aimport java.math.BigInteger;
809N/Aimport java.util.Random;
809N/A
809N/Apublic class ModPow {
809N/A public static void main(String[] args) {
809N/A Random rnd = new Random(1234);
809N/A
809N/A for (int i=0; i<2000; i++) {
809N/A BigInteger m = new BigInteger(800, rnd);
809N/A BigInteger base = new BigInteger(16, rnd);
809N/A if (rnd.nextInt() % 1 == 0)
809N/A base = base.negate();
809N/A BigInteger exp = new BigInteger(8, rnd);
809N/A
809N/A BigInteger z = base.modPow(exp, m);
809N/A BigInteger w = base.pow(exp.intValue()).mod(m);
809N/A if (!z.equals(w)){
809N/A System.err.println(base +" ** " + exp + " mod "+ m);
809N/A System.err.println("modPow : " + z);
809N/A System.err.println("pow.mod: " + w);
809N/A throw new RuntimeException("BigInteger modPow failure.");
809N/A }
809N/A }
809N/A }
809N/A}