public void init(Map attributes) {
HashMap sha_attr = new HashMap();
HashMap md5_attr = new HashMap();
byte[] secret = (byte[]) attributes.get(SECRET);
if (secret != null) {
int l = (secret.length >>> 1) + (secret.length & 1);
byte[] s1 = Util.trim(secret, 0, l);
byte[] s2 = Util.trim(secret, secret.length - l, l);
md5_attr.put(IMac.MAC_KEY_MATERIAL, s1);
sha_attr.put(IMac.MAC_KEY_MATERIAL, s2);
try {
hmac_md5.init(md5_attr);
hmac_sha.init(sha_attr);
} catch (InvalidKeyException ike) {
throw new Error(ike.toString());
}
} else if (!init) {
throw new IllegalArgumentException("no secret supplied");
}
// else re-use
byte[] seeed = (byte[]) attributes.get(SEED);
if (seeed != null) {
seed = (byte[]) seeed.clone();
} else if (!init) {
throw new IllegalArgumentException("no seed supplied");
}
// else re-use
// A(0) is the seed, A(1) = HMAC_hash(secret, A(0)).
hmac_md5.update(seed, 0, seed.length);
md5_a = hmac_md5.digest();
hmac_md5.reset();
hmac_sha.update(seed, 0, seed.length);
sha_a = hmac_sha.digest();
hmac_sha.reset();
fillBuffer();
init = true;
}
private IMac getMac(char[] password) throws MalformedKeyringException {
if (!properties.containsKey("salt")) {
throw new MalformedKeyringException("no salt");
}
byte[] salt = Util.toBytesFromString(properties.get("salt"));
IMac mac = MacFactory.getInstance(properties.get("mac"));
if (mac == null) {
throw new MalformedKeyringException("no such mac: " + properties.get("mac"));
}
int keylen = mac.macSize();
int maclen = 0;
if (!properties.containsKey("maclen")) {
throw new MalformedKeyringException("no MAC length");
}
try {
maclen = Integer.parseInt(properties.get("maclen"));
} catch (NumberFormatException nfe) {
throw new MalformedKeyringException("bad MAC length");
}
HashMap pbAttr = new HashMap();
pbAttr.put(IPBE.PASSWORD, password);
pbAttr.put(IPBE.SALT, salt);
pbAttr.put(IPBE.ITERATION_COUNT, ITERATION_COUNT);
IRandom kdf = PRNGFactory.getInstance("PBKDF2-HMAC-SHA");
kdf.init(pbAttr);
byte[] dk = new byte[keylen];
try {
kdf.nextBytes(dk, 0, keylen);
} catch (LimitReachedException shouldNotHappen) {
throw new Error(shouldNotHappen.toString());
}
HashMap macAttr = new HashMap();
macAttr.put(IMac.MAC_KEY_MATERIAL, dk);
macAttr.put(IMac.TRUNCATED_SIZE, new Integer(maclen));
try {
mac.init(macAttr);
} catch (InvalidKeyException shouldNotHappen) {
throw new Error(shouldNotHappen.toString());
}
return mac;
}
public void test(TestHarness harness) {
harness.checkPoint("TestOfTMMH16");
/*
KEY_LENGTH: 10
TAG_LENGTH: 2
key: { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc }
message: { 0xca, 0xfe, 0xba, 0xbe, 0xba, 0xde }
output: { 0x9d, 0x6a }
*/
try {
attributes.clear();
keystream = new DummyKeystream();
keystream.init(null);
output = new byte[] {(byte) 0x9d, (byte) 0x6a};
mac = new TMMH16();
attributes.put(TMMH16.KEYSTREAM, keystream);
attributes.put(TMMH16.TAG_LENGTH, new Integer(2));
mac.init(attributes);
message =
new byte[] {(byte) 0xca, (byte) 0xfe, (byte) 0xba, (byte) 0xbe, (byte) 0xba, (byte) 0xde};
for (int i = 0; i < message.length; i++) {
mac.update(message[i]);
}
result = mac.digest();
harness.check(Arrays.equals(result, output), "testVector1");
} catch (Exception x) {
harness.debug(x);
harness.fail("TestOfTMMH16.testVector1");
}
/*
KEY_LENGTH: 10
TAG_LENGTH: 2
key: { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc }
message: { 0xca, 0xfe, 0xba }
output: { 0xc8, 0x8e }
*/
try {
attributes.clear();
keystream = new DummyKeystream();
keystream.init(null);
output = new byte[] {(byte) 0xc8, (byte) 0x8e};
mac = new TMMH16();
attributes.put(TMMH16.KEYSTREAM, keystream);
attributes.put(TMMH16.TAG_LENGTH, new Integer(2));
mac.init(attributes);
message = new byte[] {(byte) 0xca, (byte) 0xfe, (byte) 0xba};
for (int i = 0; i < message.length; i++) {
mac.update(message[i]);
}
result = mac.digest();
harness.check(Arrays.equals(result, output), "testVector2");
} catch (Exception x) {
harness.debug(x);
harness.fail("TestOfTMMH16.testVector2");
}
/*
KEY_LENGTH: 10
TAG_LENGTH: 4
key: { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc }
message: { 0xca, 0xfe, 0xba, 0xbe, 0xba, 0xde }
output: { 0x9d, 0x6a, 0xc0, 0xd3 }
*/
try {
attributes.clear();
keystream = new DummyKeystream();
keystream.init(null);
output = new byte[] {(byte) 0x9d, (byte) 0x6a, (byte) 0xc0, (byte) 0xd3};
mac = new TMMH16();
attributes.put(TMMH16.KEYSTREAM, keystream);
attributes.put(TMMH16.TAG_LENGTH, new Integer(4));
mac.init(attributes);
message =
new byte[] {(byte) 0xca, (byte) 0xfe, (byte) 0xba, (byte) 0xbe, (byte) 0xba, (byte) 0xde};
for (int i = 0; i < message.length; i++) {
mac.update(message[i]);
}
result = mac.digest();
harness.check(Arrays.equals(result, output), "testVector3");
} catch (Exception x) {
harness.debug(x);
harness.fail("TestOfTMMH16.testVector3");
}
}