Crc32Test.java

package org.apache.kerberos.kerb.crypto;

import org.junit.Assert;
import org.junit.Test;

public class Crc32Test {

    static class TestCase {
        String data;
        long answer;

        public TestCase(String data, long answer) {
            this.data = data;
            this.answer = answer;
        }
    }

    static TestCase[] testCases = new TestCase[] {
            new TestCase("01", 0x77073096),
            new TestCase("02", 0xee0e612c),
            new TestCase("04", 0x076dc419),
            new TestCase("08", 0x0edb8832),
            new TestCase("10", 0x1db71064),
            new TestCase("20", 0x3b6e20c8),
            new TestCase("40", 0x76dc4190),
            new TestCase("80", 0xedb88320),
            new TestCase("0100", 0x191b3141),
            new TestCase("0200", 0x32366282),
            new TestCase("0400", 0x646cc504),
            new TestCase("0800", 0xc8d98a08),
            new TestCase("1000", 0x4ac21251),
            new TestCase("2000", 0x958424a2),
            new TestCase("4000", 0xf0794f05),
            new TestCase("8000", 0x3b83984b),
            new TestCase("0001", 0x77073096),
            new TestCase("0002", 0xee0e612c),
            new TestCase("0004", 0x076dc419),
            new TestCase("0008", 0x0edb8832),
            new TestCase("0010", 0x1db71064),
            new TestCase("0020", 0x3b6e20c8),
            new TestCase("0040", 0x76dc4190),
            new TestCase("0080", 0xedb88320),
            new TestCase("01000000", 0xb8bc6765),
            new TestCase("02000000", 0xaa09c88b),
            new TestCase("04000000", 0x8f629757),
            new TestCase("08000000", 0xc5b428ef),
            new TestCase("10000000", 0x5019579f),
            new TestCase("20000000", 0xa032af3e),
            new TestCase("40000000", 0x9b14583d),
            new TestCase("80000000", 0xed59b63b),
            new TestCase("00010000", 0x01c26a37),
            new TestCase("00020000", 0x0384d46e),
            new TestCase("00040000", 0x0709a8dc),
            new TestCase("00080000", 0x0e1351b8),
            new TestCase("00100000", 0x1c26a370),
            new TestCase("00200000", 0x384d46e0),
            new TestCase("00400000", 0x709a8dc0),
            new TestCase("00800000", 0xe1351b80),
            new TestCase("00000100", 0x191b3141),
            new TestCase("00000200", 0x32366282),
            new TestCase("00000400", 0x646cc504),
            new TestCase("00000800", 0xc8d98a08),
            new TestCase("00001000", 0x4ac21251),
            new TestCase("00002000", 0x958424a2),
            new TestCase("00004000", 0xf0794f05),
            new TestCase("00008000", 0x3b83984b),
            new TestCase("00000001", 0x77073096),
            new TestCase("00000002", 0xee0e612c),
            new TestCase("00000004", 0x076dc419),
            new TestCase("00000008", 0x0edb8832),
            new TestCase("00000010", 0x1db71064),
            new TestCase("00000020", 0x3b6e20c8),
            new TestCase("00000040", 0x76dc4190),
            new TestCase("00000080", 0xedb88320),
            new TestCase("666F6F", 0x7332bc33),
            new TestCase("7465737430313233343536373839", 0xb83e88d6),
            new TestCase("4D4153534143485653455454532049" +
                    "4E53544954565445204F4620544543484E4F4C4F4759", 0xe34180f7)
    };

    @Test
    public void testCrc32() {
        boolean isOk = true;
        for (TestCase tc : testCases) {
            if (! testWith(tc)) {
                isOk = false;
                System.err.println("Test with data " + tc.data + " failed");
            }
        }

        Assert.assertTrue(isOk);
    }

    private boolean testWith(TestCase testCase) {
        byte[] data = TestUtil.hex2bytes(testCase.data);
        long value = Crc32.crc(0, data, 0, data.length);
        return value == testCase.answer;
    }
}