/* Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/ */
package org.mozilla.gecko.sync.crypto.test;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.util.Arrays;
import org.junit.Test;
import org.mozilla.apache.commons.codec.binary.Base64;
import org.mozilla.gecko.sync.Utils;
import org.mozilla.gecko.sync.crypto.HKDF;
import org.mozilla.gecko.sync.crypto.KeyBundle;
/*
* This class tests the HKDF.java class.
* The tests are the 3 HMAC-based test cases
* from the RFC 5869 specification.
*/
public class TestHKDF {
@Test
public void testCase1() {
String IKM = "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b";
String salt = "000102030405060708090a0b0c";
String info = "f0f1f2f3f4f5f6f7f8f9";
int L = 42;
String PRK = "077709362c2e32df0ddc3f0dc47bba63" +
"90b6c73bb50f9c3122ec844ad7c2b3e5";
String OKM = "3cb25f25faacd57a90434f64d0362f2a" +
"2d2d0a90cf1a5a4c5db02d56ecc4c5bf" +
"34007208d5b887185865";
assertTrue(doStep1(IKM, salt, PRK));
assertTrue(doStep2(PRK, info, L, OKM));
}
@Test
public void testCase2() {
String IKM = "000102030405060708090a0b0c0d0e0f" +
"101112131415161718191a1b1c1d1e1f" +
"202122232425262728292a2b2c2d2e2f" +
"303132333435363738393a3b3c3d3e3f" +
"404142434445464748494a4b4c4d4e4f";
String salt = "606162636465666768696a6b6c6d6e6f" +
"707172737475767778797a7b7c7d7e7f" +
"808182838485868788898a8b8c8d8e8f" +
"909192939495969798999a9b9c9d9e9f" +
"a0a1a2a3a4a5a6a7a8a9aaabacadaeaf";
String info = "b0b1b2b3b4b5b6b7b8b9babbbcbdbebf" +
"c0c1c2c3c4c5c6c7c8c9cacbcccdcecf" +
"d0d1d2d3d4d5d6d7d8d9dadbdcdddedf" +
"e0e1e2e3e4e5e6e7e8e9eaebecedeeef" +
"f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff";
int L = 82;
String PRK = "06a6b88c5853361a06104c9ceb35b45c" +
"ef760014904671014a193f40c15fc244";
String OKM = "b11e398dc80327a1c8e7f78c596a4934" +
"4f012eda2d4efad8a050cc4c19afa97c" +
"59045a99cac7827271cb41c65e590e09" +
"da3275600c2f09b8367793a9aca3db71" +
"cc30c58179ec3e87c14c01d5c1f3434f" +
"1d87";
assertTrue(doStep1(IKM, salt, PRK));
assertTrue(doStep2(PRK, info, L, OKM));
}
@Test
public void testCase3() {
String IKM = "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b";
String salt = "";
String info = "";
int L = 42;
String PRK = "19ef24a32c717b167f33a91d6f648bdf" +
"96596776afdb6377ac434c1c293ccb04";
String OKM = "8da4e775a563c18f715f802a063c5a31" +
"b8a11f5c5ee1879ec3454e5f3c738d2d" +
"9d201395faa4b61a96c8";
assertTrue(doStep1(IKM, salt, PRK));
assertTrue(doStep2(PRK, info, L, OKM));
}
/*
* Tests the code for getting the keys necessary to
* decrypt the crypto keys bundle for Mozilla Sync.
*
* This operation is just a tailored version of the
* standard to get only the 2 keys we need.
*/
@Test
public void testGetCryptoKeysBundleKeys() {
String username = "smqvooxj664hmrkrv6bw4r4vkegjhkns";
String friendlyBase32SyncKey = "gbh7teqqcgyzd65svjgibd7tqy";
String base64EncryptionKey = "069EnS3EtDK4y1tZ1AyKX+U7WEsWRp9bRIKLdW/7aoE=";
String base64HmacKey = "LF2YCS1QCgSNCf0BCQvQ06SGH8jqJDi9dKj0O+b0fwI=";
KeyBundle bundle = null;
try {
bundle = new KeyBundle(username, friendlyBase32SyncKey);
} catch (Exception e) {
fail("Unexpected exception " + e);
}
byte[] expectedEncryptionKey = Base64.decodeBase64(base64EncryptionKey);
byte[] expectedHMACKey = Base64.decodeBase64(base64HmacKey);
assertTrue(Arrays.equals(bundle.getEncryptionKey(), expectedEncryptionKey));
assertTrue(Arrays.equals(bundle.getHMACKey(), expectedHMACKey));
}
/*
* Helper to do step 1 of RFC 5869.
*/
private boolean doStep1(String IKM, String salt, String PRK) {
try {
byte[] prkResult = HKDF.hkdfExtract(Utils.hex2Byte(salt), Utils.hex2Byte(IKM));
byte[] prkExpect = Utils.hex2Byte(PRK);
return Arrays.equals(prkResult, prkExpect);
} catch (Exception e) {
fail("Unexpected exception " + e);
}
return false;
}
/*
* Helper to do step 2 of RFC 5869.
*/
private boolean doStep2(String PRK, String info, int L, String OKM) {
try {
byte[] okmResult = HKDF.hkdfExpand(Utils.hex2Byte(PRK), Utils.hex2Byte(info), L);
byte[] okmExpect = Utils.hex2Byte(OKM);
return Arrays.equals(okmResult, okmExpect);
} catch (Exception e) {
fail("Unexpected exception " + e);
}
return false;
}
}