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<?php |
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/** |
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* Helper library for CryptoJS AES encryption/decryption |
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* Allow you to use AES encryption on client side and server side vice versa |
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* |
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* @author BrainFooLong (bfldev.com) |
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* @link https://github.com/brainfoolong/cryptojs-aes-php |
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*/ |
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/** |
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* Decrypt data from a CryptoJS json encoding string |
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* |
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* @param mixed $passphrase |
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* @param mixed $jsonString |
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* @return mixed |
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*/ |
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function cryptoJsAesDecrypt($passphrase, $jsonString){ |
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$jsondata = json_decode($jsonString, true); |
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try { |
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$salt = hex2bin($jsondata["s"]); |
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$iv = hex2bin($jsondata["iv"]); |
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} catch(Exception $e) { return null; } |
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$ct = base64_decode($jsondata["ct"]); |
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$concatedPassphrase = $passphrase.$salt; |
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$md5 = array(); |
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$md5[0] = md5($concatedPassphrase, true); |
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$result = $md5[0]; |
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for ($i = 1; $i < 3; $i++) { |
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$md5[$i] = md5($md5[$i - 1].$concatedPassphrase, true); |
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$result .= $md5[$i]; |
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} |
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$key = substr($result, 0, 32); |
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$data = openssl_decrypt($ct, 'aes-256-cbc', $key, true, $iv); |
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return json_decode($data, true); |
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} |
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/** |
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* Encrypt value to a cryptojs compatiable json encoding string |
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* |
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* @param mixed $passphrase |
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* @param mixed $value |
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* @return string |
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*/ |
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function cryptoJsAesEncrypt($passphrase, $value){ |
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$salt = openssl_random_pseudo_bytes(8); |
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$salted = ''; |
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$dx = ''; |
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while (strlen($salted) < 48) { |
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$dx = md5($dx.$passphrase.$salt, true); |
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$salted .= $dx; |
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} |
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$key = substr($salted, 0, 32); |
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$iv = substr($salted, 32,16); |
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$encrypted_data = openssl_encrypt(json_encode($value), 'aes-256-cbc', $key, true, $iv); |
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$data = array("ct" => base64_encode($encrypted_data), "iv" => bin2hex($iv), "s" => bin2hex($salt)); |
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return json_encode($data); |
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} |
