src/testcases/org/apache/poi/hssf/record/crypto/TestBiff8EncryptionKey.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.hssf.record.crypto;

import java.util.Arrays;

import junit.framework.ComparisonFailure;
import junit.framework.TestCase;

import org.apache.poi.util.HexDump;
import org.apache.poi.util.HexRead;

/**
 * Tests for {@link Biff8EncryptionKey}
 *
 * @author Josh Micich
 */
public final class TestBiff8EncryptionKey extends TestCase {

	private static byte[] fromHex(String hexString) {
		return HexRead.readFromString(hexString);
	}
	public void testCreateKeyDigest() {
		byte[] docIdData = fromHex("17 F6 D1 6B 09 B1 5F 7B 4C 9D 03 B4 81 B5 B4 4A");
		byte[] keyDigest = Biff8RC4Key.createKeyDigest("MoneyForNothing", docIdData);
		byte[] expResult = fromHex("C2 D9 56 B2 6B");
		if (!Arrays.equals(expResult, keyDigest)) {
			throw new ComparisonFailure("keyDigest mismatch", HexDump.toHex(expResult), HexDump.toHex(keyDigest));
		}
	}


	public void testValidateWithDefaultPassword() {

		String docIdSuffixA = "F 35 52 38 0D 75 4A E6 85 C2 FD 78 CE 3D D1 B6"; // valid prefix is 'D'
		String saltHashA = "30 38 BE 5E 93 C5 7E B4 5F 52 CD A1 C6 8F B6 2A";
		String saltDataA = "D4 04 43 EC B7 A7 6F 6A D2 68 C7 DF CF A8 80 68";

		String docIdB = "39 D7 80 41 DA E4 74 2C 8C 84 F9 4D 39 9A 19 2D";
		String saltDataSuffixB = "3 EA 8D 52 11 11 37 D2 BD 55 4C 01 0A 47 6E EB"; // valid prefix is 'C'
		String saltHashB = "96 19 F5 D0 F1 63 08 F1 3E 09 40 1E 87 F0 4E 16";

		confirmValid(true, "D" + docIdSuffixA, saltDataA, saltHashA);
		confirmValid(true, docIdB, "C" + saltDataSuffixB, saltHashB);
		confirmValid(false, "E" + docIdSuffixA, saltDataA, saltHashA);
		confirmValid(false, docIdB, "B" + saltDataSuffixB, saltHashB);
	}

	public void testValidateWithSuppliedPassword() {

		String docId = "DF 35 52 38 0D 75 4A E6 85 C2 FD 78 CE 3D D1 B6";
		String saltData = "D4 04 43 EC B7 A7 6F 6A D2 68 C7 DF CF A8 80 68";
		String saltHashA = "8D C2 63 CC E1 1D E0 05 20 16 96 AF 48 59 94 64"; // for password '5ecret'
		String saltHashB = "31 0B 0D A4 69 55 8E 27 A1 03 AD C9 AE F8 09 04"; // for password '5ecret'

		confirmValid(true, docId, saltData, saltHashA, "5ecret");
		confirmValid(false, docId, saltData, saltHashA, "Secret");
		confirmValid(true, docId, saltData, saltHashB, "Secret");
		confirmValid(false, docId, saltData, saltHashB, "secret");
	}


	private static void confirmValid(boolean expectedResult,
			String docIdHex, String saltDataHex, String saltHashHex) {
		confirmValid(expectedResult, docIdHex, saltDataHex, saltHashHex, null);
	}
	private static void confirmValid(boolean expectedResult,
			String docIdHex, String saltDataHex, String saltHashHex, String password) {
		byte[] docId = fromHex(docIdHex);
		byte[] saltData = fromHex(saltDataHex);
		byte[] saltHash = fromHex(saltHashHex);


		Biff8EncryptionKey key;
		if (password == null) {
			key = Biff8EncryptionKey.create(docId);
		} else {
			key = Biff8EncryptionKey.create(password, docId);
		}
		boolean actResult = key.validate(saltData, saltHash);
		if (expectedResult) {
			assertTrue("validate failed", actResult);
		} else {
			assertFalse("validate succeeded unexpectedly", actResult);
		}
	}
}