protected function processEncryptedNode(ProtocolNode $node)
{
if ($this->parent->getAxolotlStore() == null) {
return;
}
//is a chat encrypted message
$from = $node->getAttribute('from');
if (strpos($from, Constants::WHATSAPP_SERVER) !== false) {
$author = ExtractNumber($node->getAttribute('from'));
$version = $node->getChild(0)->getAttribute('v');
$encType = $node->getChild(0)->getAttribute('type');
$encMsg = $node->getChild('enc')->getData();
if (!$this->parent->getAxolotlStore()->containsSession($author, 1)) {
//we don't have the session to decrypt, save it in pending and process it later
$this->parent->addPendingNode($node);
$this->parent->logFile('info', 'Requesting cipher keys from {from}', ['from' => $author]);
$this->parent->sendGetCipherKeysFromUser($author);
} else {
//decrypt the message with the session
if ($node->getChild('enc')->getAttribute('count') == '') {
$this->parent->setRetryCounter($node->getAttribute('id'), 1);
}
if ($version == '2') {
if (!in_array($author, $this->parent->getv2Jids())) {
$this->parent->setv2Jids($author);
}
}
$plaintext = $this->decryptMessage($from, $encMsg, $encType, $node->getAttribute('id'), $node->getAttribute('t'));
//$plaintext ="A";
if ($plaintext === false) {
$this->parent->sendRetry($this->node, $from, $node->getAttribute('id'), $node->getAttribute('t'));
$this->parent->logFile('info', 'Couldn\'t decrypt message with {id} id from {from}. Retrying...', ['id' => $node->getAttribute('id'), 'from' => ExtractNumber($from)]);
return $node;
// could not decrypt
}
if (isset($this->parent->retryNodes[$node->getAttribute('id')])) {
unset($this->parent->retryNodes[$node->getAttribute('id')]);
}
if (isset($this->parent->retryCounters[$node->getAttribute('id')])) {
unset($this->parent->retryCounters[$node->getAttribute('id')]);
}
switch ($node->getAttribute('type')) {
case 'text':
$node->addChild(new ProtocolNode('body', null, null, $plaintext));
break;
case 'media':
switch ($node->getChild('enc')->getAttribute('mediatype')) {
case 'image':
$image = new ImageMessage();
$image->parseFromString($plaintext);
$keys = (new HKDFv3())->deriveSecrets($image->getRefKey(), hex2bin('576861747341707020496d616765204b657973'), 112);
$iv = substr($keys, 0, 16);
$keys = substr($keys, 16);
$parts = str_split($keys, 32);
$key = $parts[0];
$macKey = $parts[1];
$refKey = $parts[2];
//should be changed to nice curl, no extra headers :D
$file_enc = file_get_contents($image->getUrl());
//requires mac check , last 10 chars
$mac = substr($file_enc, -10);
$cipherImage = substr($file_enc, 0, strlen($file_enc) - 10);
$decrypted_image = pkcs5_unpad(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $cipherImage, MCRYPT_MODE_CBC, $iv));
//$save_file = tempnam(sys_get_temp_dir(),"WAIMG_");
//file_put_contents($save_file,$decrypted_image);
$child = new ProtocolNode('media', ['size' => $image->getLength(), 'caption' => $image->getCaption(), 'url' => $image->getUrl(), 'mimetype' => $image->getMimeType(), 'filehash' => bin2hex($image->getSha256()), 'width' => 0, 'height' => 0, 'file' => $decrypted_image, 'type' => 'image'], null, $image->getThumbnail());
$node->addChild($child);
break;
}
break;
}
$this->parent->logFile('info', 'Decrypted message with {id} from {from}', ['id' => $node->getAttribute('id'), 'from' => ExtractNumber($from)]);
return $node;
}
} else {
$author = ExtractNumber($node->getAttribute('participant'));
$group_number = ExtractNumber($node->getAttribute('from'));
$childs = $node->getChildren();
foreach ($childs as $child) {
if ($child->getAttribute('type') == 'pkmsg' || $child->getAttribute('type') == 'msg') {
if (!$this->parent->getAxolotlStore()->containsSession($author, 1)) {
$this->parent->addPendingNode($node);
$this->parent->sendGetCipherKeysFromUser($author);
break;
} else {
//decrypt senderKey and save it
$encType = $child->getAttribute('type');
$encMsg = $child->getData();
$from = $node->getAttribute('participant');
$version = $child->getAttribute('v');
if ($node->getChild('enc')->getAttribute('count') == '') {
$this->parent->setRetryCounter($node->getAttribute('id'), 1);
}
if ($version == '2') {
if (!in_array($author, $this->parent->getv2Jids())) {
$this->parent->setv2Jids($author);
}
}
$skip_unpad = $node->getChild('enc', ['type' => 'skmsg']) == null;
$senderKeyBytes = $this->decryptMessage($from, $encMsg, $encType, $node->getAttribute('id'), $node->getAttribute('t'), $node->getAttribute('from'), $skip_unpad);
if ($senderKeyBytes) {
if (!$skip_unpad) {
$senderKeyGroupMessage = new SenderKeyGroupMessage();
$senderKeyGroupMessage->parseFromString($senderKeyBytes);
} else {
$senderKeyGroupMessage = new SenderKeyGroupData();
try {
$senderKeyGroupMessage->parseFromString($senderKeyBytes);
} catch (Exception $ex) {
try {
$senderKeyGroupMessage->parseFromString(substr($senderKeyBytes, 0, -1));
} catch (Exception $ex) {
return $node;
}
}
$message = $senderKeyGroupMessage->getMessage();
$senderKeyGroupMessage = $senderKeyGroupMessage->getSenderKey();
}
$senderKey = new SenderKeyDistributionMessage(null, null, null, null, $senderKeyGroupMessage->getSenderKey());
$groupSessionBuilder = new GroupSessionBuilder($this->parent->axolotlStore);
$groupSessionBuilder->processSender($group_number . ':' . $author, $senderKey);
if (isset($message)) {
$this->parent->sendReceipt($node, 'receipt', $this->parent->getJID($this->phoneNumber));
$node->addChild(new ProtocolNode('body', null, null, $message));
}
}
}
} elseif ($child->getAttribute('type') == 'skmsg') {
$version = $child->getAttribute('v');
if ($version == '2') {
if (!in_array($author, $this->parent->v2Jids)) {
$this->parent->setv2Jids($author);
}
}
$plaintext = $this->decryptMessage([$group_number, $author], $child->getData(), $child->getAttribute('type'), $node->getAttribute('id'), $node->getAttribute('t'));
if (!$plaintext) {
$this->parent->sendRetry($this->node, $from, $node->getAttribute('id'), $node->getAttribute('t'), $node->getAttribute('participant'));
$this->parent->logFile('info', 'Couldn\'t decrypt group message with {id} id from {from}. Retrying...', ['id' => $node->getAttribute('id'), 'from' => $from]);
return $node;
// could not decrypt
} else {
if (isset($this->parent->retryNodes[$node->getAttribute('id')])) {
unset($this->parent->retryNodes[$node->getAttribute('id')]);
}
if (isset($this->parent->retryCounters[$node->getAttribute('id')])) {
unset($this->parent->retryCounters[$node->getAttribute('id')]);
}
$this->parent->logFile('info', 'Decrypted group message with {id} from {from}', ['id' => $node->getAttribute('id'), 'from' => $from]);
$this->parent->sendReceipt($node, 'receipt', $this->parent->getJID($this->phoneNumber));
$node->addChild(new ProtocolNode('body', null, null, $plaintext));
}
}
}
}
}
protected function processEncryptedNode(ProtocolNode $node)
{
if ($this->parent->getAxolotlStore() == null) {
return null;
}
//is a chat encrypted message
$from = $node->getAttribute('from');
if (strpos($from, Constants::WHATSAPP_SERVER) !== false) {
$author = ExtractNumber($node->getAttribute("from"));
$version = $node->getChild(0)->getAttribute("v");
$encType = $node->getChild(0)->getAttribute("type");
$encMsg = $node->getChild("enc")->getData();
if (!$this->parent->getAxolotlStore()->containsSession($author, 1)) {
//we don't have the session to decrypt, save it in pending and process it later
$this->parent->addPendingNode($node);
$this->parent->logFile('info', 'Requesting cipher keys from {from}', array('from' => $author));
$this->parent->sendGetCipherKeysFromUser($author);
} else {
//decrypt the message with the session
if ($node->getChild("enc")->getAttribute('count') == "") {
$this->parent->setRetryCounter = 1;
}
if ($version == "2") {
if (!in_array($author, $this->parent->getv2Jids())) {
$this->parent->setv2Jids($author);
}
}
$plaintext = $this->decryptMessage($from, $encMsg, $encType, $node->getAttribute('id'), $node->getAttribute('t'));
if (!$plaintext) {
$this->parent->sendRetry($from, $node->getAttribute('id'), $node->getAttribute('t'));
$this->parent->logFile('info', 'Couldn\'t decrypt message with {id} id from {from}. Retrying...', array('id' => $node->getAttribute('id'), 'from' => ExtractNumber($from)));
return $node;
// could not decrypt
}
switch ($node->getAttribute("type")) {
case "text":
$node->addChild(new ProtocolNode("body", null, null, $plaintext));
break;
case "media":
switch ($node->getChild("enc")->getAttribute("mediatype")) {
case "image":
$image = new ImageMessage();
$image->parseFromString($plaintext);
break;
}
break;
}
$this->parent->logFile('info', 'Decrypted message with {id} from {from}', array('id' => $node->getAttribute('id'), 'from' => ExtractNumber($from)));
return $node;
}
} else {
$author = ExtractNumber($node->getAttribute("participant"));
$group_number = ExtractNumber($node->getAttribute("from"));
$childs = $node->getChildren();
foreach ($childs as $child) {
if ($child->getAttribute("type") == "pkmsg" || $child->getAttribute("type") == "msg") {
if (!$this->parent->getAxolotlStore()->containsSession($author, 1)) {
$this->parent->addPendingNode($node);
$this->parent->sendGetCipherKeysFromUser($author);
break;
} else {
//decrypt senderKey and save it
$encType = $child->getAttribute("type");
$encMsg = $child->getData();
$from = $node->getAttribute("participant");
$version = $child->getAttribute("v");
if ($node->getChild("enc")->getAttribute('count') == "") {
$this->parent->retryCounter = 1;
}
if ($version == "2") {
if (!in_array($author, $this->parent->getv2Jids())) {
$this->parent->setv2Jids($author);
}
}
$skip_unpad = $node->getChild("enc", ["type" => "skmsg"]) == null;
$senderKeyBytes = $this->decryptMessage($from, $encMsg, $encType, $node->getAttribute('id'), $node->getAttribute('t'), $node->getAttribute("from"), $skip_unpad);
if ($senderKeyBytes) {
if (!$skip_unpad) {
$senderKeyGroupMessage = new SenderKeyGroupMessage();
$senderKeyGroupMessage->parseFromString($senderKeyBytes);
} else {
$senderKeyGroupMessage = new SenderKeyGroupData();
try {
$senderKeyGroupMessage->parseFromString($senderKeyBytes);
} catch (Exception $ex) {
try {
$senderKeyGroupMessage->parseFromString(substr($senderKeyBytes, 0, -1));
} catch (Exception $ex) {
return $node;
}
}
$message = $senderKeyGroupMessage->getMessage();
$senderKeyGroupMessage = $senderKeyGroupMessage->getSenderKey();
}
$senderKey = new SenderKeyDistributionMessage(null, null, null, null, $senderKeyGroupMessage->getSenderKey());
$groupSessionBuilder = new GroupSessionBuilder($this->axolotlStore);
$groupSessionBuilder->processSender($group_number . ":" . $author, $senderKey);
if (isset($message)) {
$this->parent->sendReceipt($node, 'receipt', $this->parent->getJID($this->phoneNumber));
$node->addChild(new ProtocolNode("body", null, null, $message));
}
}
}
} else {
if ($child->getAttribute("type") == "skmsg") {
$version = $child->getAttribute("v");
if ($version == "2") {
if (!in_array($author, $this->v2Jids)) {
$this->v2Jids[] = $author;
}
}
$plaintext = $this->decryptMessage([$group_number, $author], $child->getData(), $child->getAttribute("type"), $node->getAttribute('id'), $node->getAttribute('t'));
if (!$plaintext) {
$this->parent->sendRetry($from, $node->getAttribute('id'), $node->getAttribute('t'));
$this->parent->logFile('info', 'Couldn\'t decrypt group message with {id} id from {from}. Retrying...', array('id' => $node->getAttribute('id'), 'from' => $from));
return $node;
// could not decrypt
} else {
$this->parent->logFile('info', 'Decrypted group message with {id} from {from}', array('id' => $node->getAttribute('id'), 'from' => $from));
$this->parent->sendReceipt($node, 'receipt', $this->parent->getJID($this->phoneNumber));
$node->addChild(new ProtocolNode("body", null, null, $plaintext));
}
}
}
}
}
}