===== JSON Encryption/Decryption =====
This code works with a JSON stream encrypted with CryptoJS. You can use PHP with openSSL support to decrypt the data stream using your password.
==== Decrypt ====
/**
* Decrypt data from a CryptoJS json encoding string
*
* @param mixed $passphrase
* @param mixed $jsonString
* @return mixed
*/
function Decrypt($passphrase, $jsonString){
$jsondata = json_decode($jsonString, true);
$salt = hex2bin($jsondata["s"]);
$ct = base64_decode($jsondata["ct"]);
$iv = hex2bin($jsondata["iv"]);
$concatedPassphrase = $passphrase.$salt;
$md5 = array();
$md5[0] = md5($concatedPassphrase, true);
$result = $md5[0];
for ($i = 1; $i < 3; $i++) {
$md5[$i] = md5($md5[$i - 1].$concatedPassphrase, true);
$result .= $md5[$i];
}
$key = substr($result, 0, 32);
$data = openssl_decrypt($ct, 'aes-256-cbc', $key, true, $iv);
return json_decode($data, true);
}
==== Encrypt ====
/**
* Encrypt value to a cryptojs compatiable json encoding string
*
* @param mixed $passphrase
* @param mixed $value
* @return string
*/
function Encrypt($passphrase, $value){
$salt = openssl_random_pseudo_bytes(8);
$salted = '';
$dx = '';
while (strlen($salted) < 48) {
$dx = md5($dx.$passphrase.$salt, true);
$salted .= $dx;
}
$key = substr($salted, 0, 32);
$iv = substr($salted, 32,16);
$encrypted_data = openssl_encrypt(json_encode($value), 'aes-256-cbc', $key, true, $iv);
$data = array("ct" => base64_encode($encrypted_data), "iv" => bin2hex($iv), "s" => bin2hex($salt));
return json_encode($data);
}
==== Execute ====
$json = file_get_contents('https://encryptedURL');
$data = json_decode($json);
$secret = "YOUR PASSWORD";
$rdat = Decrypt($secret, $json);
echo $rdat;
==== Example PHP ====
$encrypted = Encrypt("my passphrase", "value to encrypt");
$decrypted = Decrypt("my passphrase", $encrypted);