/**
* @param message
* @param pointer
* @return
*/
@Override
public int parseMessageAction(byte[] message, int pointer) {
if (message[pointer] != HandshakeMessageType.SERVER_KEY_EXCHANGE.getValue()) {
throw new InvalidMessageTypeException(HandshakeMessageType.SERVER_KEY_EXCHANGE);
}
protocolMessage.setType(message[pointer]);
int currentPointer = pointer + HandshakeByteLength.MESSAGE_TYPE;
int nextPointer = currentPointer + HandshakeByteLength.MESSAGE_TYPE_LENGTH;
int length =
ArrayConverter.bytesToInt(Arrays.copyOfRange(message, currentPointer, nextPointer));
protocolMessage.setLength(length);
currentPointer = nextPointer;
nextPointer = currentPointer + HandshakeByteLength.DH_PARAM_LENGTH;
int pLength =
ArrayConverter.bytesToInt(Arrays.copyOfRange(message, currentPointer, nextPointer));
protocolMessage.setpLength(pLength);
currentPointer = nextPointer;
nextPointer = currentPointer + protocolMessage.getpLength().getValue();
BigInteger p = new BigInteger(1, Arrays.copyOfRange(message, currentPointer, nextPointer));
protocolMessage.setP(p);
currentPointer = nextPointer;
nextPointer = currentPointer + HandshakeByteLength.DH_PARAM_LENGTH;
int gLength =
ArrayConverter.bytesToInt(Arrays.copyOfRange(message, currentPointer, nextPointer));
protocolMessage.setgLength(gLength);
currentPointer = nextPointer;
nextPointer = currentPointer + protocolMessage.getgLength().getValue();
BigInteger g = new BigInteger(1, Arrays.copyOfRange(message, currentPointer, nextPointer));
protocolMessage.setG(g);
currentPointer = nextPointer;
nextPointer = currentPointer + HandshakeByteLength.DH_PARAM_LENGTH;
int publicKeyLength =
ArrayConverter.bytesToInt(Arrays.copyOfRange(message, currentPointer, nextPointer));
protocolMessage.setPublicKeyLength(publicKeyLength);
currentPointer = nextPointer;
nextPointer = currentPointer + protocolMessage.getPublicKeyLength().getValue();
BigInteger publicKey =
new BigInteger(1, Arrays.copyOfRange(message, currentPointer, nextPointer));
protocolMessage.setPublicKey(publicKey);
byte[] dhParams =
ArrayConverter.concatenate(
ArrayConverter.intToBytes(
protocolMessage.getpLength().getValue(), HandshakeByteLength.DH_PARAM_LENGTH),
BigIntegers.asUnsignedByteArray(protocolMessage.getP().getValue()),
ArrayConverter.intToBytes(
protocolMessage.getgLength().getValue(), HandshakeByteLength.DH_PARAM_LENGTH),
BigIntegers.asUnsignedByteArray(protocolMessage.getG().getValue()),
ArrayConverter.intToBytes(
protocolMessage.getPublicKeyLength().getValue(),
HandshakeByteLength.DH_PARAM_LENGTH),
BigIntegers.asUnsignedByteArray(protocolMessage.getPublicKey().getValue()));
InputStream is = new ByteArrayInputStream(dhParams);
try {
ServerDHParams publicKeyParameters = ServerDHParams.parse(is);
tlsContext.setServerDHParameters(publicKeyParameters);
if (tlsContext.getProtocolVersion() == ProtocolVersion.DTLS12
|| tlsContext.getProtocolVersion() == ProtocolVersion.TLS12) {
currentPointer = nextPointer;
nextPointer++;
HashAlgorithm ha = HashAlgorithm.getHashAlgorithm(message[currentPointer]);
protocolMessage.setHashAlgorithm(ha.getValue());
currentPointer = nextPointer;
nextPointer++;
SignatureAlgorithm sa = SignatureAlgorithm.getSignatureAlgorithm(message[currentPointer]);
protocolMessage.setSignatureAlgorithm(sa.getValue());
}
currentPointer = nextPointer;
nextPointer = currentPointer + HandshakeByteLength.SIGNATURE_LENGTH;
int signatureLength =
ArrayConverter.bytesToInt(Arrays.copyOfRange(message, currentPointer, nextPointer));
protocolMessage.setSignatureLength(signatureLength);
currentPointer = nextPointer;
nextPointer = currentPointer + signatureLength;
protocolMessage.setSignature(Arrays.copyOfRange(message, currentPointer, nextPointer));
protocolMessage.setCompleteResultingMessage(
Arrays.copyOfRange(message, pointer, nextPointer));
return nextPointer;
} catch (IOException ex) {
throw new WorkflowExecutionException("DH public key parsing failed", ex);
}
}
