67 lines
2.5 KiB
Java
67 lines
2.5 KiB
Java
/*
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* Copyright (c) 2022, 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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import jdk.test.lib.Asserts;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.nio.charset.StandardCharsets;
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import java.security.DigestInputStream;
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import java.security.MessageDigest;
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/**
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* @test
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* @bug 6587699
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* @summary Document DigestInputStream behavior when skip() or mark() / reset() is used
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* @library /test/lib
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*/
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public class TestSkipAndReset {
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public static void main(String[] args) throws Exception {
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byte[] data = "1234567890".getBytes(StandardCharsets.UTF_8);
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MessageDigest md = MessageDigest.getInstance("SHA-256");
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DigestInputStream dis = new DigestInputStream(new ByteArrayInputStream(data), md);
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dis.read(); // read 1
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dis.read(new byte[2], 0, 1); // read 2
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dis.skip(3); // skip 3 4 5
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dis.mark(10); // remember 5
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dis.read(new byte[2]); // read 6 7
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dis.skip(1); // skip 8
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dis.read(); // read 9
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dis.reset(); // back to 5
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dis.readNBytes(3); // read 6 7 8
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dis.reset(); // back to 5
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dis.skip(2); // skip 6 7
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dis.readAllBytes(); // read 8 9 0
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dis.reset(); // back to 5
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dis.skip(3); // skip 6 7 8
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dis.transferTo(new ByteArrayOutputStream()); // read 9 0
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byte[] hash = md.digest();
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byte[] directHash = md.digest("1267967889090".getBytes(StandardCharsets.UTF_8));
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Asserts.assertTrue(MessageDigest.isEqual(hash, directHash));
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}
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}
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