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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

import static java.lang.System.out;

import java.nio.ByteBuffer;

import java.security.MessageDigest;

import java.util.Random;

/**

 * @test

 * @bug 8050371

 * @summary Check md.getDigestLength() equal digest output length with various

 *          algorithm/dataLen/(update,digest methods).

 * @author Kevin Liu

 */

public class TestSameLength {

    public static void main(String[] args) throws Exception {

        TestSameLength test = new TestSameLength();

        test.run();

    }

    private void run() throws Exception {

        String[] algorithmArr = {

                "SHA", "Sha", "SHA-1", "sha-1", "SHA1", "sha1", "MD5", "md5",

                "SHA-224", "SHA-256", "SHA-384", "SHA-512"

        };

        int[] nUpdatesArr = {

                0, 1, 2, 3

        };

        int[] dataLenArr = {

                1, 50, 2500, 125000, 6250000

        };

        for (String algorithm: algorithmArr) {

            for (UpdateMethod update: UpdateMethod.values()) {

                for (int dataLen: dataLenArr) {

                    if (!runTest(algorithm, dataLen, update)) {

                        throw new RuntimeException(

                                "Test failed at algorithm/dataLen/numUpdate:"

                                        + algorithm + "/" + dataLen + "/"

                                        + update.toString());

                    }

                }

            }

        }

        out.println("All " + algorithmArr.length * nUpdatesArr.length

                * dataLenArr.length + " tests Passed");

    }

    private boolean runTest(String algo, long dataLen,

            UpdateMethod whichUpdate) throws Exception {

        try {

            // Do initialization

            byte[] data = new byte[(int) dataLen];

            new Random().nextBytes(data);

            MessageDigest md = MessageDigest.getInstance(algo);

            int outputLen = md.getDigestLength();

            // Perform the update using all available/possible update methods

            whichUpdate.updateDigest(data, md, dataLen);

            // Get the output

            byte[] output = md.digest();

            // Compare input and output

            return outputLen == output.length;

        } catch (Exception ex) {

            System.err.println("Testing: " + algo + "/" + dataLen + "/"

                    + whichUpdate.toString()

                    + " failed with unexpected exception");

            ex.printStackTrace();

            throw ex;

        }

    }

    private static enum UpdateMethod {

        UPDATE_BYTE {

            @Override

            public void updateDigest(byte[] data,

                    MessageDigest md, long dataLen) {

                for (int i = 0; i < dataLen; i++) {

                    md.update(data[i]);

                }

            }

        },

        UPDATE_BUFFER {

            @Override

            public void updateDigest(byte[] data,

                    MessageDigest md, long dataLen) {

                md.update(data);

            }

        },

        UPDATE_BUFFER_LEN {

            @Override

            public void updateDigest(byte[] data,

                    MessageDigest md, long dataLen) {

                for (int i = 0; i < dataLen; i++) {

                    md.update(data, i, 1);

                }

            }

        },

        UPDATE_BYTE_BUFFER {

            @Override

            public void updateDigest(byte[] data,

                    MessageDigest md, long dataLen) {

                md.update(ByteBuffer.wrap(data));

            }

        };

        public abstract void updateDigest(byte[] data,

                    MessageDigest md, long dataLen);

        }

}