static byte[] buildDH(DHPublicKey key) {
DataByteOutputStream out = new DataByteOutputStream();
BigInteger p = key.getParams().getP();
BigInteger g = key.getParams().getG();
BigInteger y = key.getY();
int pLength, gLength, yLength;
if (g.equals(TWO) && (p.equals(DHPRIME768) || p.equals(DHPRIME1024))) {
pLength = 1;
gLength = 0;
} else {
pLength = BigIntegerLength(p);
gLength = BigIntegerLength(g);
}
yLength = BigIntegerLength(y);
out.writeShort(pLength);
if (pLength == 1) {
if (p.bitLength() == 768) out.writeByte((byte) 1);
else out.writeByte((byte) 2);
} else out.writeBigInteger(p);
out.writeShort(gLength);
if (gLength > 0) out.writeBigInteger(g);
out.writeShort(yLength);
out.writeBigInteger(y);
return out.toByteArray();
}
/**
* Returns whether the Diffie-Hellman public key is valid or not.
*
* <p>Per RFC 2631 and NIST SP800-56A, the following algorithm is used to validate Diffie-Hellman
* public keys: 1. Verify that y lies within the interval [2,p-1]. If it does not, the key is
* invalid. 2. Compute y^q mod p. If the result == 1, the key is valid. Otherwise the key is
* invalid.
*/
private static void validateDHPublicKey(DHPublicKey publicKey) throws InvalidKeyException {
DHParameterSpec paramSpec = publicKey.getParams();
BigInteger p = paramSpec.getP();
BigInteger g = paramSpec.getG();
BigInteger y = publicKey.getY();
validateDHPublicKey(p, g, y);
}
public void setRemoteDHPublicKey(DHPublicKey dhPublicKey) {
// Verifies that Alice's gy is a legal value (2 <= gy <= modulus-2)
if (dhPublicKey.getY().compareTo(OtrCryptoEngine.MODULUS_MINUS_TWO) > 0) {
throw new IllegalArgumentException("Illegal D-H Public Key value, Ignoring message.");
} else if (dhPublicKey.getY().compareTo(OtrCryptoEngine.BIGINTEGER_TWO) < 0) {
throw new IllegalArgumentException("Illegal D-H Public Key value, Ignoring message.");
}
logger.finest("Received D-H Public Key is a legal value.");
this.remoteDHPublicKey = dhPublicKey;
}
static DHPublicKeySpec getDHPublicKeySpec(PublicKey key) {
if (key instanceof DHPublicKey) {
DHPublicKey dhKey = (DHPublicKey) key;
DHParameterSpec params = dhKey.getParams();
return new DHPublicKeySpec(dhKey.getY(), params.getP(), params.getG());
}
try {
KeyFactory factory = JsseJce.getKeyFactory("DH");
return (DHPublicKeySpec) factory.getKeySpec(key, DHPublicKeySpec.class);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Create a set of public/private keys using ValueLinks defined parameters
*
* @return KeyPair object containing both public and private keys
* @throws NoSuchAlgorithmException
* @throws InvalidAlgorithmParameterException
*/
public KeyPair createKeys()
throws NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeySpecException {
// initialize the parameter spec
DHPublicKey publicKey = (DHPublicKey) this.getValueLinkPublicKey();
DHParameterSpec dhParamSpec = publicKey.getParams();
// Debug.logInfo(dhParamSpec.getP().toString() + " / " + dhParamSpec.getG().toString(), module);
// create the public/private key pair using parameters defined by valuelink
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DH");
keyGen.initialize(dhParamSpec);
KeyPair keyPair = keyGen.generateKeyPair();
return keyPair;
}
public void testIODHPublicKey() throws Exception {
KeyPair pair = new OtrCryptoEngineImpl().generateDHKeyPair();
DHPublicKey source = (DHPublicKey) pair.getPublic();
ByteArrayOutputStream out = new ByteArrayOutputStream();
OtrOutputStream oos = new OtrOutputStream(out);
oos.writeDHPublicKey(source);
byte[] converted = out.toByteArray();
ByteArrayInputStream bin = new ByteArrayInputStream(converted);
OtrInputStream ois = new OtrInputStream(bin);
DHPublicKey result = ois.readDHPublicKey();
assertTrue(source.getY().compareTo(result.getY()) == 0);
}
protected KeySpec engineGetKeySpec(Key key, Class spec) throws InvalidKeySpecException {
if (spec.isAssignableFrom(PKCS8EncodedKeySpec.class) && key.getFormat().equals("PKCS#8")) {
return new PKCS8EncodedKeySpec(key.getEncoded());
} else if (spec.isAssignableFrom(X509EncodedKeySpec.class) && key.getFormat().equals("X.509")) {
return new X509EncodedKeySpec(key.getEncoded());
} else if (spec.isAssignableFrom(RSAPublicKeySpec.class) && key instanceof RSAPublicKey) {
RSAPublicKey k = (RSAPublicKey) key;
return new RSAPublicKeySpec(k.getModulus(), k.getPublicExponent());
} else if (spec.isAssignableFrom(RSAPrivateKeySpec.class) && key instanceof RSAPrivateKey) {
RSAPrivateKey k = (RSAPrivateKey) key;
return new RSAPrivateKeySpec(k.getModulus(), k.getPrivateExponent());
} else if (spec.isAssignableFrom(RSAPrivateCrtKeySpec.class)
&& key instanceof RSAPrivateCrtKey) {
RSAPrivateCrtKey k = (RSAPrivateCrtKey) key;
return new RSAPrivateCrtKeySpec(
k.getModulus(),
k.getPublicExponent(),
k.getPrivateExponent(),
k.getPrimeP(),
k.getPrimeQ(),
k.getPrimeExponentP(),
k.getPrimeExponentQ(),
k.getCrtCoefficient());
} else if (spec.isAssignableFrom(DHPrivateKeySpec.class) && key instanceof DHPrivateKey) {
DHPrivateKey k = (DHPrivateKey) key;
return new DHPrivateKeySpec(k.getX(), k.getParams().getP(), k.getParams().getG());
} else if (spec.isAssignableFrom(DHPublicKeySpec.class) && key instanceof DHPublicKey) {
DHPublicKey k = (DHPublicKey) key;
return new DHPublicKeySpec(k.getY(), k.getParams().getP(), k.getParams().getG());
}
throw new RuntimeException("not implemented yet " + key + " " + spec);
}
@Override
public int hashCode() {
final int prime = 31;
int result = super.hashCode();
result = prime * result + Arrays.hashCode(ctr);
result = prime * result + Arrays.hashCode(encryptedMessage);
result = prime * result + flags;
result = prime * result + Arrays.hashCode(mac);
// TODO: Needs work.
result = prime * result + ((nextDH == null) ? 0 : nextDH.hashCode());
result = prime * result + Arrays.hashCode(oldMACKeys);
result = prime * result + recipientKeyID;
result = prime * result + senderKeyID;
return result;
}
protected Key engineDoPhase(Key key, boolean lastPhase)
throws InvalidKeyException, IllegalStateException {
if (x == null) {
throw new IllegalStateException("Diffie-Hellman not initialised.");
}
if (!(key instanceof DHPublicKey)) {
throw new InvalidKeyException("DHKeyAgreement doPhase requires DHPublicKey");
}
DHPublicKey pubKey = (DHPublicKey) key;
if (!pubKey.getParams().getG().equals(g) || !pubKey.getParams().getP().equals(p)) {
throw new InvalidKeyException("DHPublicKey not for this KeyAgreement!");
}
if (lastPhase) {
result = ((DHPublicKey) key).getY().modPow(x, p);
return null;
} else {
result = ((DHPublicKey) key).getY().modPow(x, p);
}
return new BCDHPublicKey(result, pubKey.getParams());
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (!super.equals(obj)) return false;
if (getClass() != obj.getClass()) return false;
DataMessage other = (DataMessage) obj;
if (!Arrays.equals(ctr, other.ctr)) return false;
if (!Arrays.equals(encryptedMessage, other.encryptedMessage)) return false;
if (flags != other.flags) return false;
if (!Arrays.equals(mac, other.mac)) return false;
if (nextDH == null) {
if (other.nextDH != null) return false;
} else if (!nextDH.equals(other.nextDH)) return false;
if (!Arrays.equals(oldMACKeys, other.oldMACKeys)) return false;
if (recipientKeyID != other.recipientKeyID) return false;
if (senderKeyID != other.senderKeyID) return false;
return true;
}
/** Given a DH key pair, return the BIND9-style text encoding */
private String generatePrivateDH(DHPrivateKey key, DHPublicKey pub, int algorithm) {
StringWriter sw = new StringWriter();
PrintWriter out = new PrintWriter(sw);
DnsKeyAlgorithm algs = DnsKeyAlgorithm.getInstance();
DHParameterSpec p = key.getParams();
out.println("Private-key-format: v1.2");
out.println("Algorithm: " + algorithm + " (" + algs.algToString(algorithm) + ")");
out.print("Prime(p): ");
out.println(b64BigInt(p.getP()));
out.print("Generator(g): ");
out.println(b64BigInt(p.getG()));
out.print("Private_value(x): ");
out.println(b64BigInt(key.getX()));
out.print("Public_value(y): ");
out.println(b64BigInt(pub.getY()));
return sw.toString();
}
/**
* Return the generated public value for this key agreement operation as a <code>BigInteger</code>
* .
*
* @return The diffie-hellman public value as a <code>BigInteger</code>.
*/
public BigInteger getPublicValue() {
DHPublicKey pubKey = (DHPublicKey) keyPair.getPublic();
return pubKey.getY();
}
private void testGP(int size, int privateValueSize, BigInteger g, BigInteger p) throws Exception {
DHParameterSpec elParams = new DHParameterSpec(p, g, privateValueSize);
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ElGamal", "BC");
byte[] in = "This is a test".getBytes();
keyGen.initialize(elParams);
KeyPair keyPair = keyGen.generateKeyPair();
SecureRandom rand = new SecureRandom();
checkKeySize(privateValueSize, keyPair);
Cipher cipher = Cipher.getInstance("ElGamal", "BC");
cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand);
if (cipher.getOutputSize(in.length) != (size / 8) * 2) {
fail("getOutputSize wrong on encryption");
}
byte[] out = cipher.doFinal(in);
cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
if (cipher.getOutputSize(out.length) != (size / 8) - 1) {
fail("getOutputSize wrong on decryption");
}
//
// No Padding - maximum length
//
byte[] modBytes = ((DHPublicKey) keyPair.getPublic()).getParams().getP().toByteArray();
byte[] maxInput = new byte[modBytes.length - 1];
maxInput[0] |= 0x7f;
cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand);
out = cipher.doFinal(maxInput);
cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
out = cipher.doFinal(out);
if (!areEqual(out, maxInput)) {
fail(
"NoPadding test failed on decrypt expected "
+ new String(Hex.encode(maxInput))
+ " got "
+ new String(Hex.encode(out)));
}
//
// encrypt/decrypt
//
Cipher c1 = Cipher.getInstance("ElGamal", "BC");
Cipher c2 = Cipher.getInstance("ElGamal", "BC");
c1.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand);
byte[] out1 = c1.doFinal(in);
c2.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
byte[] out2 = c2.doFinal(out1);
if (!areEqual(in, out2)) {
fail(size + " encrypt test failed");
}
//
// encrypt/decrypt with update
//
int outLen = c1.update(in, 0, 2, out1, 0);
outLen += c1.doFinal(in, 2, in.length - 2, out1, outLen);
outLen = c2.update(out1, 0, 2, out2, 0);
outLen += c2.doFinal(out1, 2, out1.length - 2, out2, outLen);
if (!areEqual(in, out2)) {
fail(size + " encrypt with update test failed");
}
//
// public key encoding test
//
byte[] pubEnc = keyPair.getPublic().getEncoded();
KeyFactory keyFac = KeyFactory.getInstance("ElGamal", "BC");
X509EncodedKeySpec pubX509 = new X509EncodedKeySpec(pubEnc);
DHPublicKey pubKey = (DHPublicKey) keyFac.generatePublic(pubX509);
DHParameterSpec spec = pubKey.getParams();
if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) {
fail(size + " bit public key encoding/decoding test failed on parameters");
}
if (!((DHPublicKey) keyPair.getPublic()).getY().equals(pubKey.getY())) {
fail(size + " bit public key encoding/decoding test failed on y value");
}
//
// public key serialisation test
//
pubKey = (DHPublicKey) serializeDeserialize(keyPair.getPublic());
spec = pubKey.getParams();
if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) {
fail(size + " bit public key serialisation test failed on parameters");
}
if (!((DHPublicKey) keyPair.getPublic()).getY().equals(pubKey.getY())) {
fail(size + " bit public key serialisation test failed on y value");
}
if (!keyPair.getPublic().equals(pubKey)) {
fail("equals test failed");
}
if (keyPair.getPublic().hashCode() != pubKey.hashCode()) {
fail("hashCode test failed");
}
//
// private key encoding test
//
byte[] privEnc = keyPair.getPrivate().getEncoded();
PKCS8EncodedKeySpec privPKCS8 = new PKCS8EncodedKeySpec(privEnc);
DHPrivateKey privKey = (DHPrivateKey) keyFac.generatePrivate(privPKCS8);
spec = privKey.getParams();
if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) {
fail(size + " bit private key encoding/decoding test failed on parameters");
}
if (!((DHPrivateKey) keyPair.getPrivate()).getX().equals(privKey.getX())) {
fail(size + " bit private key encoding/decoding test failed on y value");
}
//
// private key serialisation test
//
privKey = (DHPrivateKey) serializeDeserialize(keyPair.getPrivate());
spec = privKey.getParams();
if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) {
fail(size + " bit private key serialisation test failed on parameters");
}
if (!((DHPrivateKey) keyPair.getPrivate()).getX().equals(privKey.getX())) {
fail(size + " bit private key serialisation test failed on y value");
}
if (!keyPair.getPrivate().equals(privKey)) {
fail("equals test failed");
}
if (keyPair.getPrivate().hashCode() != privKey.hashCode()) {
fail("hashCode test failed");
}
if (!(privKey instanceof PKCS12BagAttributeCarrier)) {
fail("private key not implementing PKCS12 attribute carrier");
}
}
private void testDefault(int privateValueSize, BigInteger g, BigInteger p) throws Exception {
DHParameterSpec elParams = new DHParameterSpec(p, g, privateValueSize);
int size = p.bitLength();
new BouncyCastleProvider().setParameter(ConfigurableProvider.DH_DEFAULT_PARAMS, elParams);
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ElGamal", "BC");
byte[] in = "This is a test".getBytes();
keyGen.initialize(p.bitLength());
KeyPair keyPair = keyGen.generateKeyPair();
new BouncyCastleProvider().setParameter(ConfigurableProvider.DH_DEFAULT_PARAMS, elParams);
SecureRandom rand = new SecureRandom();
checkKeySize(privateValueSize, keyPair);
Cipher cipher = Cipher.getInstance("ElGamal", "BC");
cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand);
if (cipher.getOutputSize(in.length) != (size / 8) * 2) {
fail("getOutputSize wrong on encryption");
}
byte[] out = cipher.doFinal(in);
cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
if (cipher.getOutputSize(out.length) != (size / 8) - 1) {
fail("getOutputSize wrong on decryption");
}
//
// No Padding - maximum length
//
byte[] modBytes = ((DHPublicKey) keyPair.getPublic()).getParams().getP().toByteArray();
byte[] maxInput = new byte[modBytes.length - 1];
maxInput[0] |= 0x7f;
cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand);
out = cipher.doFinal(maxInput);
cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
out = cipher.doFinal(out);
if (!areEqual(out, maxInput)) {
fail(
"NoPadding test failed on decrypt expected "
+ new String(Hex.encode(maxInput))
+ " got "
+ new String(Hex.encode(out)));
}
//
// encrypt/decrypt
//
Cipher c1 = Cipher.getInstance("ElGamal", "BC");
Cipher c2 = Cipher.getInstance("ElGamal", "BC");
c1.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand);
byte[] out1 = c1.doFinal(in);
c2.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
byte[] out2 = c2.doFinal(out1);
if (!areEqual(in, out2)) {
fail(size + " encrypt test failed");
}
//
// encrypt/decrypt with update
//
int outLen = c1.update(in, 0, 2, out1, 0);
outLen += c1.doFinal(in, 2, in.length - 2, out1, outLen);
outLen = c2.update(out1, 0, 2, out2, 0);
outLen += c2.doFinal(out1, 2, out1.length - 2, out2, outLen);
if (!areEqual(in, out2)) {
fail(size + " encrypt with update test failed");
}
//
// public key encoding test
//
byte[] pubEnc = keyPair.getPublic().getEncoded();
KeyFactory keyFac = KeyFactory.getInstance("ElGamal", "BC");
X509EncodedKeySpec pubX509 = new X509EncodedKeySpec(pubEnc);
DHPublicKey pubKey = (DHPublicKey) keyFac.generatePublic(pubX509);
DHParameterSpec spec = pubKey.getParams();
if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) {
fail(size + " bit public key encoding/decoding test failed on parameters");
}
if (!((DHPublicKey) keyPair.getPublic()).getY().equals(pubKey.getY())) {
fail(size + " bit public key encoding/decoding test failed on y value");
}
//
// public key serialisation test
//
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
ObjectOutputStream oOut = new ObjectOutputStream(bOut);
oOut.writeObject(keyPair.getPublic());
ByteArrayInputStream bIn = new ByteArrayInputStream(bOut.toByteArray());
ObjectInputStream oIn = new ObjectInputStream(bIn);
pubKey = (DHPublicKey) oIn.readObject();
spec = pubKey.getParams();
if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) {
fail(size + " bit public key serialisation test failed on parameters");
}
if (!((DHPublicKey) keyPair.getPublic()).getY().equals(pubKey.getY())) {
fail(size + " bit public key serialisation test failed on y value");
}
//
// private key encoding test
//
byte[] privEnc = keyPair.getPrivate().getEncoded();
PKCS8EncodedKeySpec privPKCS8 = new PKCS8EncodedKeySpec(privEnc);
DHPrivateKey privKey = (DHPrivateKey) keyFac.generatePrivate(privPKCS8);
spec = privKey.getParams();
if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) {
fail(size + " bit private key encoding/decoding test failed on parameters");
}
if (!((DHPrivateKey) keyPair.getPrivate()).getX().equals(privKey.getX())) {
fail(size + " bit private key encoding/decoding test failed on y value");
}
//
// private key serialisation test
//
bOut = new ByteArrayOutputStream();
oOut = new ObjectOutputStream(bOut);
oOut.writeObject(keyPair.getPrivate());
bIn = new ByteArrayInputStream(bOut.toByteArray());
oIn = new ObjectInputStream(bIn);
privKey = (DHPrivateKey) oIn.readObject();
spec = privKey.getParams();
if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP())) {
fail(size + " bit private key serialisation test failed on parameters");
}
if (!((DHPrivateKey) keyPair.getPrivate()).getX().equals(privKey.getX())) {
fail(size + " bit private key serialisation test failed on y value");
}
}
JCEElGamalPublicKey(DHPublicKey key) {
this.y = key.getY();
this.elSpec = new ElGamalParameterSpec(key.getParams().getP(), key.getParams().getG());
}
private StringBuffer outputKeyCreation(int loop, boolean kekOnly, String kekTest) {
StringBuffer buf = new StringBuffer();
loop++;
if (loop > 100) {
// only loop 100 times; then throw an exception
throw new IllegalStateException("Unable to create 128 byte keys in 100 tries");
}
// place holder for the keys
DHPrivateKey privateKey = null;
DHPublicKey publicKey = null;
if (!kekOnly) {
KeyPair keyPair = null;
try {
keyPair = this.createKeys();
} catch (NoSuchAlgorithmException e) {
Debug.logError(e, module);
} catch (InvalidAlgorithmParameterException e) {
Debug.logError(e, module);
} catch (InvalidKeySpecException e) {
Debug.logError(e, module);
}
if (keyPair != null) {
publicKey = (DHPublicKey) keyPair.getPublic();
privateKey = (DHPrivateKey) keyPair.getPrivate();
if (publicKey == null || publicKey.getY().toByteArray().length != 128) {
// run again until we get a 128 byte public key for VL
return this.outputKeyCreation(loop, kekOnly, kekTest);
}
} else {
Debug.logInfo("Returned a null KeyPair", module);
return this.outputKeyCreation(loop, kekOnly, kekTest);
}
} else {
// use our existing private key to generate a KEK
try {
privateKey = (DHPrivateKey) this.getPrivateKey();
} catch (Exception e) {
Debug.logError(e, module);
}
}
// the KEK
byte[] kekBytes = null;
try {
kekBytes = this.generateKek(privateKey);
} catch (NoSuchAlgorithmException e) {
Debug.logError(e, module);
} catch (InvalidKeySpecException e) {
Debug.logError(e, module);
} catch (InvalidKeyException e) {
Debug.logError(e, module);
}
// the 3DES KEK value
SecretKey loadedKek = this.getDesEdeKey(kekBytes);
byte[] loadKekBytes = loadedKek.getEncoded();
// test the KEK
Cipher cipher = this.getCipher(this.getKekKey(), Cipher.ENCRYPT_MODE);
byte[] kekTestB = {0, 0, 0, 0, 0, 0, 0, 0};
byte[] kekTestC = new byte[0];
if (kekTest != null) {
kekTestB = StringUtil.fromHexString(kekTest);
}
// encrypt the test bytes
try {
kekTestC = cipher.doFinal(kekTestB);
} catch (Exception e) {
Debug.logError(e, module);
}
if (!kekOnly) {
// public key (just Y)
BigInteger y = publicKey.getY();
byte[] yBytes = y.toByteArray();
String yHex = StringUtil.toHexString(yBytes);
buf.append("======== Begin Public Key (Y @ ")
.append(yBytes.length)
.append(" / ")
.append(yHex.length())
.append(") ========\n");
buf.append(yHex).append("\n");
buf.append("======== End Public Key ========\n\n");
// private key (just X)
BigInteger x = privateKey.getX();
byte[] xBytes = x.toByteArray();
String xHex = StringUtil.toHexString(xBytes);
buf.append("======== Begin Private Key (X @ ")
.append(xBytes.length)
.append(" / ")
.append(xHex.length())
.append(") ========\n");
buf.append(xHex).append("\n");
buf.append("======== End Private Key ========\n\n");
// private key (full)
byte[] privateBytes = privateKey.getEncoded();
String privateHex = StringUtil.toHexString(privateBytes);
buf.append("======== Begin Private Key (Full @ ")
.append(privateBytes.length)
.append(" / ")
.append(privateHex.length())
.append(") ========\n");
buf.append(privateHex).append("\n");
buf.append("======== End Private Key ========\n\n");
}
if (kekBytes != null) {
buf.append("======== Begin KEK (").append(kekBytes.length).append(") ========\n");
buf.append(StringUtil.toHexString(kekBytes)).append("\n");
buf.append("======== End KEK ========\n\n");
buf.append("======== Begin KEK (DES) (").append(loadKekBytes.length).append(") ========\n");
buf.append(StringUtil.toHexString(loadKekBytes)).append("\n");
buf.append("======== End KEK (DES) ========\n\n");
buf.append("======== Begin KEK Test (").append(kekTestC.length).append(") ========\n");
buf.append(StringUtil.toHexString(kekTestC)).append("\n");
buf.append("======== End KEK Test ========\n\n");
} else {
Debug.logError("KEK came back empty", module);
}
return buf;
}
/**
* Perform CA (Chip Authentication) part of EAC (version 1). For details see TR-03110 ver. 1.11.
* In short, we authenticate the chip with (EC)DH key agreement protocol and create new secure
* messaging keys.
*
* @param keyId passport's public key id (stored in DG14), -1 if none
* @param publicKey passport's public key (stored in DG14)
* @return the chip authentication result
* @throws CardServiceException if CA failed or some error occurred
*/
public synchronized ChipAuthenticationResult doCA(BigInteger keyId, PublicKey publicKey)
throws CardServiceException {
if (publicKey == null) {
throw new IllegalArgumentException("Public key is null");
}
try {
String agreementAlg = Util.inferKeyAgreementAlgorithm(publicKey);
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(agreementAlg);
AlgorithmParameterSpec params = null;
if ("DH".equals(agreementAlg)) {
DHPublicKey dhPublicKey = (DHPublicKey) publicKey;
params = dhPublicKey.getParams();
} else if ("ECDH".equals(agreementAlg)) {
ECPublicKey ecPublicKey = (ECPublicKey) publicKey;
params = ecPublicKey.getParams();
} else {
throw new IllegalStateException("Unsupported algorithm \"" + agreementAlg + "\"");
}
keyPairGenerator.initialize(params);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
KeyAgreement agreement = KeyAgreement.getInstance(agreementAlg);
agreement.init(keyPair.getPrivate());
agreement.doPhase(publicKey, true);
byte[] secret = agreement.generateSecret();
// TODO: this SHA1ing may have to be removed?
// TODO: this hashing is needed for our Java Card passport applet implementation
// byte[] secret = md.digest(secret);
byte[] keyData = null;
byte[] idData = null;
byte[] keyHash = new byte[0];
if ("DH".equals(agreementAlg)) {
DHPublicKey dhPublicKey = (DHPublicKey) keyPair.getPublic();
keyData = dhPublicKey.getY().toByteArray();
// TODO: this is probably wrong, what should be hashed?
MessageDigest md = MessageDigest.getInstance("SHA1");
md = MessageDigest.getInstance("SHA1");
keyHash = md.digest(keyData);
} else if ("ECDH".equals(agreementAlg)) {
org.bouncycastle.jce.interfaces.ECPublicKey ecPublicKey =
(org.bouncycastle.jce.interfaces.ECPublicKey) keyPair.getPublic();
keyData = ecPublicKey.getQ().getEncoded();
byte[] t = Util.i2os(ecPublicKey.getQ().getX().toBigInteger());
keyHash =
Util.alignKeyDataToSize(t, ecPublicKey.getParameters().getCurve().getFieldSize() / 8);
}
keyData = Util.wrapDO((byte) 0x91, keyData);
if (keyId.compareTo(BigInteger.ZERO) >= 0) {
byte[] keyIdBytes = keyId.toByteArray();
idData = Util.wrapDO((byte) 0x84, keyIdBytes);
}
sendMSEKAT(wrapper, keyData, idData);
SecretKey ksEnc = Util.deriveKey(secret, Util.ENC_MODE);
SecretKey ksMac = Util.deriveKey(secret, Util.MAC_MODE);
long ssc = 0;
wrapper = new DESedeSecureMessagingWrapper(ksEnc, ksMac, ssc);
state = CA_AUTHENTICATED_STATE;
return new ChipAuthenticationResult(keyId, publicKey, keyHash, keyPair);
} catch (GeneralSecurityException e) {
throw new CardServiceException(e.toString());
}
}
