68 lines
2.3 KiB
Java
68 lines
2.3 KiB
Java
/*
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* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8308474
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* @summary Test that calling initSign resets RNG
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*/
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import java.security.KeyPairGenerator;
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import java.security.PrivateKey;
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import java.security.SecureRandom;
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import java.security.Signature;
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import java.util.Arrays;
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import java.util.Random;
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public class SecureRandomReset {
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public static void main(String[] args) throws Exception {
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KeyPairGenerator g = KeyPairGenerator.getInstance("DSA");
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PrivateKey sk = g.generateKeyPair().getPrivate();
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Signature s = Signature.getInstance("SHA256withDSA");
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// Initialize deterministic RNG and sign
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s.initSign(sk, deterministic());
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byte[] sig1 = s.sign();
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// Re-initialize deterministic RNG and sign
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s.initSign(sk, deterministic());
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byte[] sig2 = s.sign();
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if (!Arrays.equals(sig1,sig2)) {
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System.out.println("Expected equal signatures");
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throw new RuntimeException("initSign not properly resetting RNG");
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}
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}
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static SecureRandom deterministic() {
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return new SecureRandom() {
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final Random r = new Random(0);
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@Override
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public void nextBytes(byte[] bytes) {
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r.nextBytes(bytes);
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}
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};
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}
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} |