67 lines
2.5 KiB
Java
67 lines
2.5 KiB
Java
/*
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* Copyright (c) 2021, 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 javax.crypto.spec.OAEPParameterSpec;
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import javax.crypto.spec.PSource;
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import java.io.IOException;
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import java.security.AlgorithmParameters;
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import java.security.spec.MGF1ParameterSpec;
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import java.util.Arrays;
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/**
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* @test
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* @bug 8246797
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* @summary Ensures OAEPParameters read correct encoding and
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* reject encoding with invalid ordering
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*/
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public class OAEPOrder {
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public static void main(String[] args) throws Exception {
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// Do not use default fields
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OAEPParameterSpec spec = new OAEPParameterSpec(
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"SHA-384", "MGF1", MGF1ParameterSpec.SHA384,
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new PSource.PSpecified(new byte[10]));
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AlgorithmParameters alg = AlgorithmParameters.getInstance("OAEP");
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alg.init(spec);
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byte[] encoded = alg.getEncoded();
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// Extract the fields inside encoding
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// [0] HashAlgorithm
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byte[] a0 = Arrays.copyOfRange(encoded, 2, encoded[3] + 4);
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// [1] MaskGenAlgorithm + [2] PSourceAlgorithm
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byte[] a12 = Arrays.copyOfRange(encoded, 2 + a0.length, encoded.length);
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// and rearrange [1] and [2] before [0]
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System.arraycopy(a12, 0, encoded, 2, a12.length);
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System.arraycopy(a0, 0, encoded, 2 + a12.length, a0.length);
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AlgorithmParameters alg2 = AlgorithmParameters.getInstance("OAEP");
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try {
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alg2.init(encoded);
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throw new RuntimeException("Should fail");
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} catch (IOException ioe) {
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// expected
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}
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}
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}
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