airways/meeseeks.php

## readme.md

      
    Raw
  

              readme.md
            
          
    I'm Mr. Meeseeks the PHP Encryption Tool, look at me!

Hey buddy, this utility can help you improve your golf swing!
No wait, it can help you encrypt and decrypt files!


This is a probably very insecure encryption/decryption utility written in PHP.
It creates self-extracting executable PHP scripts which contain their own
archive data.
You can also use your own copy of meeseeks.php to decrypt any .meeseeks file you
recieve. It will detect the special marker comment and get the data after that,
ignoring the script before it.
You can verify a .meeseeks file has not been modified by comparing it to the copy
in this gist. The only differences should be in the preamble explaining that it
is a self extracting script. The remaining difference should be 100% BASE64
encoded data.
$ diff -l meeseeks.php meeseeks.php.meeseeks

(see meeseeks.php.diff-against.meeseeks.php.meeseeks.diff at the end of this gist for what it should
look like)
The encryopted copy of meeseeks.php.meeseeks below was encrypted with this key:
14A9357CF652D9839BF266F4209A8E3D

You can decrypt it like this:
php ./meeseeks.php.meeseeks decrypt -k 14A9357CF652D9839BF266F4209A8E3D

(this will replace meeseeks.php if you already download it)
or using meeseeks.php (and avoiding clobbering it):
mkdir ./data
mv ./meeseeks.php.meeseeks ./data/meeseeks.php.meeseeks
php ./meeseeks.php decrypt -f ./data/meeseeks.php.meeseeks -k 14A9357CF652D9839BF266F4209A8E3D

Oh and please let me know how insecure this is!
Thanks!

  
## meeseeks.php
<?php
// I'm Mr. Meeseeks the PHP Encryption Tool, look at me!
//
// Cobbled together with great trepidation by Blueapples.
//
// Visit me at Blueapples.org
//
// Version 1.0, 2022-09-26.

define('LF', "\n");

function meeseeks_error(int $code, string|array|object $message = 'Unknown error') {
    echo str_repeat('!', 80).LF;
    if(is_array($message) || is_object($message)) $message = json_encode($message);
    echo 'MEESEEKS ERROR #'.$code.': '.$message.LF.LF;
    exit;
}
function meeseeks_sanitize(array &$data) {
    foreach($data as $k => $v) {
        if(strpos(strtolower($k), 'email') !== FALSE) {
            $v = filter_var($v, FILTER_SANITIZE_EMAIL);
        }
        $v = str_replace(LF, '|EOL|', $v);
        $v = strip_tags($v);
        $v = filter_var($v, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_STRIP_LOW|FILTER_FLAG_STRIP_HIGH);
        $data[$k] = $v;
    }
}

function meeseeks_implode($data) {
    if(!is_array($data) && !is_object($data)) {
        exit(meeseeks_error(600, 'Cannot implode non-array/non-object value:'.$data));
    }
    $type = is_object($data) ? 'OBJ' : 'ARR';
    $data = (array)$data;
    ksort($data);
    $result = 'MEESEEKS<0>';
    $result .= $type.'<0>';
    $result .= implode('<1>', array_keys($data)).'<0>';
    $result .= implode('<1>', $data).'<0>';
    $result .= md5($result).'<0>';
    return $result;
}

function meeseeks_explode($str) {
    $data = explode('<0>', $str);
    $sig  = $data[0];
    $type = $data[1];
    $keys = $data[2];
    $vals = $data[3];
    $hash = $data[4];
    if($sig !== 'MEESEEKS') {
        exit(meeseeks_error(700, ['err' => 'Invalid MV signature (should be MEESEEKS)', 'str' => $str]));
    }
    $keys = explode('<1>', $keys);
    $vals = explode('<1>', $vals);
    if(count($keys) !== count($vals)) {
        exit(meeseeks_error(701, ['err' => 'Parallel arrays differ in length', 'str' => $str]));
    }
    $result = array_combine($keys, $vals);
    switch($type) {
    case 'ARR':
        break;
    case 'OBJ':
        $result = (object)$result;
        break;
    default:
        exit(meeseeks_error(702, ['err' => 'Invalid type', 'str' => $str]));
    }
    return $result;
}


class UnsafeCrypto
{
    const METHOD = 'aes-256-ctr';

    /**
     * Encrypts (but does not authenticate) a message
     *
     * @param string $message - plaintext message
     * @param string $key - encryption key (raw binary expected)
     * @param boolean $encode - set to TRUE to return a base64-encoded
     * @return string (raw binary)
     */
    public static function encrypt($message, $key, $encode = false)
    {
        $nonceSize = openssl_cipher_iv_length(self::METHOD);
        $nonce = openssl_random_pseudo_bytes($nonceSize);

        $ciphertext = openssl_encrypt(
            $message,
            self::METHOD,
            $key,
            OPENSSL_RAW_DATA,
            $nonce
        );

        // Now let's pack the IV and the ciphertext together
        // Naively, we can just concatenate
        if ($encode) {
            return base64_encode($nonce.$ciphertext);
        }
        return $nonce.$ciphertext;
    }

    /**
     * Decrypts (but does not verify) a message
     *
     * @param string $message - ciphertext message
     * @param string $key - encryption key (raw binary expected)
     * @param boolean $encoded - are we expecting an encoded string?
     * @return string
     */
    public static function decrypt($message, $key, $encoded = false)
    {
        if ($encoded) {
            $message = base64_decode($message, true);
            if ($message === false) {
                throw new Exception('Encryption failure');
            }
        }

        $nonceSize = openssl_cipher_iv_length(self::METHOD);
        $nonce = mb_substr($message, 0, $nonceSize, '8bit');
        $ciphertext = mb_substr($message, $nonceSize, null, '8bit');

        $plaintext = openssl_decrypt(
            $ciphertext,
            self::METHOD,
            $key,
            OPENSSL_RAW_DATA,
            $nonce
        );

        return $plaintext;
    }
}

class SaferCrypto extends UnsafeCrypto
{
    const HASH_ALGO = 'sha256';

    /**
     * Encrypts then MACs a message
     *
     * @param string $message - plaintext message
     * @param string $key - encryption key (raw binary expected)
     * @param boolean $encode - set to TRUE to return a base64-encoded string
     * @return string (raw binary)
     */
    public static function encrypt($message, $key, $encode = false)
    {
        list($encKey, $authKey) = self::splitKeys($key);

        // Pass to UnsafeCrypto::encrypt
        $ciphertext = parent::encrypt($message, $encKey);

        // Calculate a MAC of the IV and ciphertext
        $mac = hash_hmac(self::HASH_ALGO, $ciphertext, $authKey, true);

        if ($encode) {
            return base64_encode($mac.$ciphertext);
        }
        // Prepend MAC to the ciphertext and return to caller
        return $mac.$ciphertext;
    }

    /**
     * Decrypts a message (after verifying integrity)
     *
     * @param string $message - ciphertext message
     * @param string $key - encryption key (raw binary expected)
     * @param boolean $encoded - are we expecting an encoded string?
     * @return string (raw binary)
     */
    public static function decrypt($message, $key, $encoded = false)
    {
        list($encKey, $authKey) = self::splitKeys($key);
        if ($encoded) {
            $message = base64_decode($message, true);
            if ($message === false) {
                throw new Exception('Encryption failure');
            }
        }

        // Hash Size -- in case HASH_ALGO is changed
        $hs = mb_strlen(hash(self::HASH_ALGO, '', true), '8bit');
        $mac = mb_substr($message, 0, $hs, '8bit');

        $ciphertext = mb_substr($message, $hs, null, '8bit');

        $calculated = hash_hmac(
            self::HASH_ALGO,
            $ciphertext,
            $authKey,
            true
        );

        if (!self::hashEquals($mac, $calculated)) {
            throw new Exception('Encryption failure');
        }

        // Pass to UnsafeCrypto::decrypt
        $plaintext = parent::decrypt($ciphertext, $encKey);

        return $plaintext;
    }

    /**
     * Splits a key into two separate keys; one for encryption
     * and the other for authenticaiton
     *
     * @param string $masterKey (raw binary)
     * @return array (two raw binary strings)
     */
    protected static function splitKeys($masterKey)
    {
        // You really want to implement HKDF here instead!
        return [
            hash_hmac(self::HASH_ALGO, 'ENCRYPTION', $masterKey, true),
            hash_hmac(self::HASH_ALGO, 'AUTHENTICATION', $masterKey, true)
        ];
    }

    /**
     * Compare two strings without leaking timing information
     *
     * @param string $a
     * @param string $b
     * @ref https://paragonie.com/b/WS1DLx6BnpsdaVQW
     * @return boolean
     */
    protected static function hashEquals($a, $b)
    {
        if (function_exists('hash_equals')) {
            return hash_equals($a, $b);
        }
        $nonce = openssl_random_pseudo_bytes(32);
        return hash_hmac(self::HASH_ALGO, $a, $nonce) === hash_hmac(self::HASH_ALGO, $b, $nonce);
    }
}

function meeseeks_encrypt(string $key, string|array|object $data) {
    if(strlen($key) < 32) {
        echo$key.LF;
        exit(meeseeks_error(604, 'Encrypt key is not long enough: '.strlen($key)));
    }
    if(is_object($data) || is_array($data)) {
        $data = json_encode($data);
    }
    return chunk_split(base64_encode(SaferCrypto::encrypt($data, $key)), separator: LF);
}

function meeseeks_decrypt(string $key, string $data, string|array|object $default=NULL, bool $throwException=FALSE): string|array|object {
    if(strlen($key) < 32) {
        exit(meeseeks_error(604, 'Decrypt key is not long enough: '.strlen($key)));
    }
    try {
        $data = SaferCrypto::decrypt(base64_decode($data), $key);
        if(substr($data, 0, 1) == '{'
         ||substr($data, 0, 1) == '[') {
            $data = json_decode($data);
         }
    } catch(Exception $e) {
        if($throwException) {
            throw $e;
        }
        return $default;
    }
    return $data;
}

function meeseeks_signdata(string $sig_key, string|array|object &$data): string|array|object {
    if(is_object($data) || is_array($data)) {
        // turn array or object into string
        $signature = meeseeks_implode($data);
    }

    // hash the string
    $signature = md5($signature);

    //echo 'Outgoing hash: '.$signature.LF;
    // encrypt the hash
    $signature = meeseeks_encrypt($signature, $sig_key);
    //echo 'Outgoing encrypted hash: '.$signature.LF;

    if(strlen(meeseeks_decrypt($signature, $sig_key)) !== 32) {
        exit(meeseeks_error(601, 'Generated signature is invalid length'));
    }

    // make signature easier to read
    $signature = trim(str_replace('=', '', chunk_split($signature, 8, ' ')));

    //echo 'Outgoing encrypted hash: '.$signature;
    // add signature to incoming data
    if(is_object($data)) {
        $data->signature = $signature;
    } elseif(is_array($data)) {
        $data['signature'] = $signature;
    } else {
        $data .= '<0>'.$signature;
    }
    return $signature;
}

function meeseeks_signcheck(string $sig_key, string|array|object $data): bool {
    // get signature from the data
    // we also need to unset it from our
    // copy so we can recalculate the correct
    // hash
    $data = clone $data;
    if(is_array($data)) {
        $signature = $data['signature'];
        unset($data['signature']);
    } elseif(is_object($data)) {
        $signature = $data->signature;
        unset($data->signature);
    } else {
        $data = explode('<0>', $data);
        $signature = array_pop($data);
        $data = implode('<0>', $data);
    }

    // turn array or object into string
    if(is_object($data) || is_array($object)) {
        $data = meeseeks_implode($data);
    }

    // hash the string
    $check_signature = md5($data);
    //echo 'Incoming encrypted hash: '.$signature;

    // decrypt the incoming hash
    $signature = meeseeks_decrypt($signature, $sig_key);
    //echo 'Incoming hash: '.$signature.LF;
    //echo 'Check hash   : '.$check_signature.LF;

    return !is_null($signature)
        && !is_null($check_signature)
        && strlen($signature) > 16
        && strlen($check_signature) > 16
        && $signature === $check_signature;
}

class RegExOpt {
    var $pattern;
    var $options;
    var $regex_delimiter;

    function __construct(string $pattern, string $options = '', $regex_delimiter = '/') {
        $this->pattern = $pattern;
        $this->options = $options;
        $this->regex_delimiter = $regex_delimiter;
    }

    function __toString() {
        return $this->regex_delimiter
            . str_replace($this->regex_delimiter, '\\'.$this->regex_delimiter, $this->pattern)
            . $this->regex_delimiter
            . $this->options;
    }
}


enum opt_required: int {
    case YES = 1;
    case NO = 0;
}

function meeseeks_getopt_flag(array $argv, string|array $option, opt_required $required = opt_required::NO): bool {
    is_array($option) OR $option = [$option];
    foreach($argv as $index => $arg) {
        if(in_array($arg, $option)) {
            return true;
        }
    }
    if($required == opt_required::YES) {
        cmd_help(help_reason::OPTION_ERROR, $option);
    }
    return false;
}

function meeseeks_getopt_value(array $argv, string|array $option_pattern, opt_required $required = opt_required::NO, $regex_delimiter = '/'): string {
    is_array($option_pattern) OR $option_pattern = [$option_pattern];

    // In this loop, "arg" means an actual user-provided CLI argument
    // from argv, and "option" means the program-requested to opt to
    // search for.

    // Check each user-provided argument to see if it was the one(s) requested
    foreach($argv as $index => $arg) {
        // First search to see if it is in the array of options explicitly
        if(in_array($arg, $option_pattern)) {
            if($index+1 < count($argv)) {
                return $argv[$index+1];
            } else {
                goto not_found;
            }
        } else {
            // Next, check if any of the options are patterns; and if so if
            // they match this user-provided argument
            foreach($option_pattern as $pattern) {
                // RegExOpt instances are the clearest way to provide parameters,
                // and the only way if you need to use options. We will also
                // handle strings that start and end with the regex delimiter.
                if($pattern instanceof RegExOpt || (substr($pattern, 0, 1) == $regex_delimiter && substr($pattern, -1, 1) == $regex_delimiter)) {
                    // it looks like a regex so let's try to match it
                    if(preg_match($pattern, $arg, $matches)) {
                        // No subpatterns?
                        if(count($matches) == 1) {
                            // Get next argument or return empty string
                            if($index+1 < count($argv)) {
                                return $argv[$index+1];
                            } else {
                                goto not_found;
                            }
                        } else {
                            // Return the match
                            return $matches[1];
                        }

                    }
                } // if($pattern <is a regex>)
            } // foreach($option_pattern as $pattern)
        } // else if(in_array($arg, $option_pattern))
    } // foreach($argv as $index => $arg)


not_found:
    if($required == opt_required::YES) {
        meeseeks_error(900, 'Option '.implode(' or ', $option_pattern).(count($option_pattern) > 1 ? ' are' : ' is').' required');
    }
    return '';
} // function meeseeks_getopt_value()

enum help_reason: int {
    case REQUESTED = 0;
    case MISSING = 1;
    case INVALID = 2;
    case OPTION_ERROR = 3;
}

function cmd_help(help_reason $reason = help_reason::REQUESTED, array $missing_options = []) {
    echo LF;
    $look_at_me = '= "I\'m Mr. Meeseeks the PHP Encryption Tool, look at me!"';
    echo str_repeat('=', 80).LF;
    echo '||'.$look_at_me.str_repeat(' ', 80-strlen($look_at_me)-4).'||'.LF;
    echo str_repeat('=', 80).LF;

    if(in_array($reason, [help_reason::INVALID, help_reason::MISSING])) {
        echo LF;
        echo 'Gosh I\'d love to help with your golf swing, but ';
        if($reason === help_reason::INVALID) echo 'I don\'t know that commaaaaaand!'.LF;
        if($reason === help_reason::MISSING) echo 'you didn\'t enter a commaaaaaand!'.LF;
    }

    if($reason === help_reason::OPTION_ERROR) {
        echo LF;
        echo (count($missing_options) > 1 ? '  Error: One of the options `' : 'The option `')
                .implode('` or `', $missing_options).(count($missing_options) > 1 ? '` are' : '` is')
                .' required.';
        echo LF;
    }
    if(defined('IS_SELF_EXTRACTING_FILE_ARCHIVE')) {
        echo LF;
        echo '[Self Extract]'.LF;
        echo 'Since this is a self extracting file you can run it by doing this:'.LF;
        echo '  php ./file_name.meeseeks decrypt -k $KEY'.LF;
        echo LF;
    }

    echo LF;
    echo '[Usage]'.LF;
    echo 'Generate a secure random key of 32 HEX bytes. Example, which may or may not be secure on your system:'.LF;
    echo LF;
    echo '  KEY=`head -c16 </dev/urandom|xxd -p -u`; echo $KEY;'.LF;
    echo LF;
    echo LF;
    echo '[Encrypt a File]'.LF;
    echo 'To encrypt a file named file_name with this key and save it to file_name.meeseeks'.LF;
    echo '(overwriting that file if it exists), you would then run: '.LF;
    echo '  php ./meeseeks.php encrypt $KEY meeseeks'.LF;
    echo LF;
    echo LF;
    echo '[Decrypt a File]'.LF;
    echo 'To decrypt a file named file_name.meeseeks with the same key, and save the plaintext file to'.LF;
    echo 'file_name (overwriting that file if it exists), you would then run: '.LF;
    echo '  php ./meeseeks.php decrypt $KEY file_name.meeseeks'.LF;
    exit;
}

function cmd_encrypt(array $argv) {
    $p_key  = meeseeks_getopt_value($argv, ['-k', '-key'], opt_required::YES);
    $p_file_in  = meeseeks_getopt_value($argv, ['-f', '-in'], opt_required::YES);
    $p_file_out = $p_file_in.'.meeseeks';

    if(meeseeks_getopt_flag($argv, '-v')) {
        echo '-- encrypt --'.LF;
        echo 'Key: '.$p_key.LF;
        echo 'Encrypt file: '.$p_file_in.LF;
        echo 'Output file: '.$p_file_out.LF;
    }

    file_put_contents($p_file_out, str_replace("<?php", "<?php define('IS_SELF_EXTRACTING_FILE_ARCHIVE', true); ".LF
                                                        ."/* Hey there, I am a self extracting archive built with meeseeks.php, look at me!".LF
                                                        ."   Seriously, you can see how this file was built by reading the code".LF
                                                        ."   below. This file requires PHP 8.1 or higher. */".LF,
                                                        file_get_contents(__FILE__))
                                                        .'#'.md5('start_of_data')
                                                        .meeseeks_encrypt($p_key, file_get_contents($p_file_in)));
}

function cmd_decrypt(array $argv) {
    $p_key  = meeseeks_getopt_value($argv, ['-k', '-key'], opt_required::YES);
    if(defined('IS_SELF_EXTRACTING_FILE_ARCHIVE')) {
        $p_file_in  = __FILE__;
    } else {
        $p_file_in  = meeseeks_getopt_value($argv, ['-f', '-in'], opt_required::YES);
    }
    $p_file_out = str_replace('.meeseeks', '', $p_file_in);

    if(meeseeks_getopt_flag($argv, '-v')) {
        echo '-- decrypt --'.LF;
        echo 'Key: '.$p_key.LF;
        echo 'Decrypt file: '.$p_file_in.LF;
        echo 'Output file: '.$p_file_out.LF;
    }

    $cypher_text = file_get_contents($p_file_in);
    $data_start = '#'.md5('start_of_data');
    if(($data_pos = strpos($cypher_text, $data_start)) !== false) {
        $data_pos += strlen($data_start);
        echo 'Extracting data from file at position '.$data_pos.LF;
        echo substr($cypher_text, $data_pos, 30).LF.LF;
        $cypher_text = substr($cypher_text, $data_pos);
    }

    file_put_contents($p_file_out, meeseeks_decrypt($p_key, $cypher_text));
}

function main(int $argc, array $argv) {
    meeseeks_sanitize($argv);

    $p_cmd = meeseeks_getopt_value($argv, ['-c', new RegExOpt(pattern: '.+\.php'), new RegExOpt(pattern: '.+\.meeseeks')]);

    if(meeseeks_getopt_flag($argv, ['-h', '-help'])) $p_cmd = 'help';

    $commands = ['encrypt', 'decrypt', 'help'];

    if(in_array($p_cmd, $commands)) {
        $exec = 'cmd_'.$p_cmd;
        $exec($argv);
    } else {
        if(strlen($p_cmd) > 0) {
            cmd_help(help_reason::INVALID);
        } else {
            cmd_help(help_reason::MISSING);
        }
    }

}

main($argc, $argv);
exit(0);
?>

## meeseeks.php.diff-against.meeseeks.php.meeseeks.diff


2022-09-26 20:30    diff -l meeseeks.php meeseeks.php.meeseeks    Page 1


1c1,5
< <?php
---
> <?php define('IS_SELF_EXTRACTING_FILE_ARCHIVE', true);
> /* Hey there, I am a self extracting archive built with meeseeks.php, look at me!
>    Seriously, you can see how this file was built by reading the code
>    below. This file requires PHP 8.1 or higher. */
>
505c509,517
<     file_put_contents($p_file_out, str_replace("<?php", "<?php define('IS_SELF_EXTRACTING_FILE_ARCHIVE', true); ".LF
---
>     file_put_contents($p_file_out, str_replace("<?php define('IS_SELF_EXTRACTING_FILE_ARCHIVE', true);
> /* Hey there, I am a self extracting archive built with meeseeks.php, look at me!
>    Seriously, you can see how this file was built by reading the code
>    below. This file requires PHP 8.1 or higher. */
> ", "<?php define('IS_SELF_EXTRACTING_FILE_ARCHIVE', true);
> /* Hey there, I am a self extracting archive built with meeseeks.php, look at me!
>    Seriously, you can see how this file was built by reading the code
>    below. This file requires PHP 8.1 or higher. */
>  define('IS_SELF_EXTRACTING_FILE_ARCHIVE', true); ".LF
566a579,917
> #f7bee8925a87acfe0516a436804c644dMYKJhaLwMiU//B1gDNqr+thInalOQ2s6TEyVCMPD7ifRVrQfmeTXW7cw1cfaqrCx1hPENDTqgH7p
> 1drWVuas9I5myJZ19flSXZKuS6Xn8wTnNDIFzY9r026+3rc1QmColM4RJgSpmgq75rihTowkK9WF
> rKIATT0Vf4hSF/E4Z3CSW4QaaEcxzIjgrAbwvDhdCi20dET4Jaa0LY5OO3NVM0NS8SyneGyl3VVE
> 7mVbsciarx7algorEUSUy1Zf4O3Gk1BKodhbOvJaIyCZvwl1i7xX5WZ+VuTAWYfAYK6+fM0+5kzC
> wrkL0Rnzlep9v0Oh5tYOGcZQqCJ6koc2uThuJewVkxboIv/HC0fxOBoGY7+M3qsMEn5hHmPPclxQ
> dh9kVF/avmty6W2BSoEQyimyPWsWnlT0rKfRJ6o/CDckh6/emJCCONcr9nJcjUo4GwjiUumVZk1i
> UEsiO/h0vxZedcwrIerEe65/xphwTRUzWd4fXCHN6ymsu/4Y6RDHxMd7XmV0sVRsC5eOoIFhl+ZP
> UIh9SDBaIVUm815iyEmad7Fk2VDpKU4NIW35pPmL/ibgnt7GfE90RGLLOYGchpkWnarfUjYdbcWt
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2022-09-26 20:30    diff -l meeseeks.php meeseeks.php.meeseeks    Page 7


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> HX0=


## meeseeks.php.meeseeks
<?php define('IS_SELF_EXTRACTING_FILE_ARCHIVE', true);
/* Hey there, I am a self extracting archive built with meeseeks.php, look at me!
   Seriously, you can see how this file was built by reading the code
   below. This file requires PHP 8.1 or higher. */

// I'm Mr. Meeseeks the PHP Encryption Tool, look at me!
//
// Cobbled together with great trepidation by Blueapples.
//
// Visit me at Blueapples.org
//
// Version 1.0, 2022-09-26.

define('LF', "\n");

function meeseeks_error(int $code, string|array|object $message = 'Unknown error') {
    echo str_repeat('!', 80).LF;
    if(is_array($message) || is_object($message)) $message = json_encode($message);
    echo 'MEESEEKS ERROR #'.$code.': '.$message.LF.LF;
    exit;
}
function meeseeks_sanitize(array &$data) {
    foreach($data as $k => $v) {
        if(strpos(strtolower($k), 'email') !== FALSE) {
            $v = filter_var($v, FILTER_SANITIZE_EMAIL);
        }
        $v = str_replace(LF, '|EOL|', $v);
        $v = strip_tags($v);
        $v = filter_var($v, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_STRIP_LOW|FILTER_FLAG_STRIP_HIGH);
        $data[$k] = $v;
    }
}

function meeseeks_implode($data) {
    if(!is_array($data) && !is_object($data)) {
        exit(meeseeks_error(600, 'Cannot implode non-array/non-object value:'.$data));
    }
    $type = is_object($data) ? 'OBJ' : 'ARR';
    $data = (array)$data;
    ksort($data);
    $result = 'MEESEEKS<0>';
    $result .= $type.'<0>';
    $result .= implode('<1>', array_keys($data)).'<0>';
    $result .= implode('<1>', $data).'<0>';
    $result .= md5($result).'<0>';
    return $result;
}

function meeseeks_explode($str) {
    $data = explode('<0>', $str);
    $sig  = $data[0];
    $type = $data[1];
    $keys = $data[2];
    $vals = $data[3];
    $hash = $data[4];
    if($sig !== 'MEESEEKS') {
        exit(meeseeks_error(700, ['err' => 'Invalid MV signature (should be MEESEEKS)', 'str' => $str]));
    }
    $keys = explode('<1>', $keys);
    $vals = explode('<1>', $vals);
    if(count($keys) !== count($vals)) {
        exit(meeseeks_error(701, ['err' => 'Parallel arrays differ in length', 'str' => $str]));
    }
    $result = array_combine($keys, $vals);
    switch($type) {
    case 'ARR':
        break;
    case 'OBJ':
        $result = (object)$result;
        break;
    default:
        exit(meeseeks_error(702, ['err' => 'Invalid type', 'str' => $str]));
    }
    return $result;
}


class UnsafeCrypto
{
    const METHOD = 'aes-256-ctr';

    /**
     * Encrypts (but does not authenticate) a message
     *
     * @param string $message - plaintext message
     * @param string $key - encryption key (raw binary expected)
     * @param boolean $encode - set to TRUE to return a base64-encoded
     * @return string (raw binary)
     */
    public static function encrypt($message, $key, $encode = false)
    {
        $nonceSize = openssl_cipher_iv_length(self::METHOD);
        $nonce = openssl_random_pseudo_bytes($nonceSize);

        $ciphertext = openssl_encrypt(
            $message,
            self::METHOD,
            $key,
            OPENSSL_RAW_DATA,
            $nonce
        );

        // Now let's pack the IV and the ciphertext together
        // Naively, we can just concatenate
        if ($encode) {
            return base64_encode($nonce.$ciphertext);
        }
        return $nonce.$ciphertext;
    }

    /**
     * Decrypts (but does not verify) a message
     *
     * @param string $message - ciphertext message
     * @param string $key - encryption key (raw binary expected)
     * @param boolean $encoded - are we expecting an encoded string?
     * @return string
     */
    public static function decrypt($message, $key, $encoded = false)
    {
        if ($encoded) {
            $message = base64_decode($message, true);
            if ($message === false) {
                throw new Exception('Encryption failure');
            }
        }

        $nonceSize = openssl_cipher_iv_length(self::METHOD);
        $nonce = mb_substr($message, 0, $nonceSize, '8bit');
        $ciphertext = mb_substr($message, $nonceSize, null, '8bit');

        $plaintext = openssl_decrypt(
            $ciphertext,
            self::METHOD,
            $key,
            OPENSSL_RAW_DATA,
            $nonce
        );

        return $plaintext;
    }
}

class SaferCrypto extends UnsafeCrypto
{
    const HASH_ALGO = 'sha256';

    /**
     * Encrypts then MACs a message
     *
     * @param string $message - plaintext message
     * @param string $key - encryption key (raw binary expected)
     * @param boolean $encode - set to TRUE to return a base64-encoded string
     * @return string (raw binary)
     */
    public static function encrypt($message, $key, $encode = false)
    {
        list($encKey, $authKey) = self::splitKeys($key);

        // Pass to UnsafeCrypto::encrypt
        $ciphertext = parent::encrypt($message, $encKey);

        // Calculate a MAC of the IV and ciphertext
        $mac = hash_hmac(self::HASH_ALGO, $ciphertext, $authKey, true);

        if ($encode) {
            return base64_encode($mac.$ciphertext);
        }
        // Prepend MAC to the ciphertext and return to caller
        return $mac.$ciphertext;
    }

    /**
     * Decrypts a message (after verifying integrity)
     *
     * @param string $message - ciphertext message
     * @param string $key - encryption key (raw binary expected)
     * @param boolean $encoded - are we expecting an encoded string?
     * @return string (raw binary)
     */
    public static function decrypt($message, $key, $encoded = false)
    {
        list($encKey, $authKey) = self::splitKeys($key);
        if ($encoded) {
            $message = base64_decode($message, true);
            if ($message === false) {
                throw new Exception('Encryption failure');
            }
        }

        // Hash Size -- in case HASH_ALGO is changed
        $hs = mb_strlen(hash(self::HASH_ALGO, '', true), '8bit');
        $mac = mb_substr($message, 0, $hs, '8bit');

        $ciphertext = mb_substr($message, $hs, null, '8bit');

        $calculated = hash_hmac(
            self::HASH_ALGO,
            $ciphertext,
            $authKey,
            true
        );

        if (!self::hashEquals($mac, $calculated)) {
            throw new Exception('Encryption failure');
        }

        // Pass to UnsafeCrypto::decrypt
        $plaintext = parent::decrypt($ciphertext, $encKey);

        return $plaintext;
    }

    /**
     * Splits a key into two separate keys; one for encryption
     * and the other for authenticaiton
     *
     * @param string $masterKey (raw binary)
     * @return array (two raw binary strings)
     */
    protected static function splitKeys($masterKey)
    {
        // You really want to implement HKDF here instead!
        return [
            hash_hmac(self::HASH_ALGO, 'ENCRYPTION', $masterKey, true),
            hash_hmac(self::HASH_ALGO, 'AUTHENTICATION', $masterKey, true)
        ];
    }

    /**
     * Compare two strings without leaking timing information
     *
     * @param string $a
     * @param string $b
     * @ref https://paragonie.com/b/WS1DLx6BnpsdaVQW
     * @return boolean
     */
    protected static function hashEquals($a, $b)
    {
        if (function_exists('hash_equals')) {
            return hash_equals($a, $b);
        }
        $nonce = openssl_random_pseudo_bytes(32);
        return hash_hmac(self::HASH_ALGO, $a, $nonce) === hash_hmac(self::HASH_ALGO, $b, $nonce);
    }
}

function meeseeks_encrypt(string $key, string|array|object $data) {
    if(strlen($key) < 32) {
        echo$key.LF;
        exit(meeseeks_error(604, 'Encrypt key is not long enough: '.strlen($key)));
    }
    if(is_object($data) || is_array($data)) {
        $data = json_encode($data);
    }
    return chunk_split(base64_encode(SaferCrypto::encrypt($data, $key)), separator: LF);
}

function meeseeks_decrypt(string $key, string $data, string|array|object $default=NULL, bool $throwException=FALSE): string|array|object {
    if(strlen($key) < 32) {
        exit(meeseeks_error(604, 'Decrypt key is not long enough: '.strlen($key)));
    }
    try {
        $data = SaferCrypto::decrypt(base64_decode($data), $key);
        if(substr($data, 0, 1) == '{'
         ||substr($data, 0, 1) == '[') {
            $data = json_decode($data);
         }
    } catch(Exception $e) {
        if($throwException) {
            throw $e;
        }
        return $default;
    }
    return $data;
}

function meeseeks_signdata(string $sig_key, string|array|object &$data): string|array|object {
    if(is_object($data) || is_array($data)) {
        // turn array or object into string
        $signature = meeseeks_implode($data);
    }

    // hash the string
    $signature = md5($signature);

    //echo 'Outgoing hash: '.$signature.LF;
    // encrypt the hash
    $signature = meeseeks_encrypt($signature, $sig_key);
    //echo 'Outgoing encrypted hash: '.$signature.LF;

    if(strlen(meeseeks_decrypt($signature, $sig_key)) !== 32) {
        exit(meeseeks_error(601, 'Generated signature is invalid length'));
    }

    // make signature easier to read
    $signature = trim(str_replace('=', '', chunk_split($signature, 8, ' ')));

    //echo 'Outgoing encrypted hash: '.$signature;
    // add signature to incoming data
    if(is_object($data)) {
        $data->signature = $signature;
    } elseif(is_array($data)) {
        $data['signature'] = $signature;
    } else {
        $data .= '<0>'.$signature;
    }
    return $signature;
}

function meeseeks_signcheck(string $sig_key, string|array|object $data): bool {
    // get signature from the data
    // we also need to unset it from our
    // copy so we can recalculate the correct
    // hash
    $data = clone $data;
    if(is_array($data)) {
        $signature = $data['signature'];
        unset($data['signature']);
    } elseif(is_object($data)) {
        $signature = $data->signature;
        unset($data->signature);
    } else {
        $data = explode('<0>', $data);
        $signature = array_pop($data);
        $data = implode('<0>', $data);
    }

    // turn array or object into string
    if(is_object($data) || is_array($object)) {
        $data = meeseeks_implode($data);
    }

    // hash the string
    $check_signature = md5($data);
    //echo 'Incoming encrypted hash: '.$signature;

    // decrypt the incoming hash
    $signature = meeseeks_decrypt($signature, $sig_key);
    //echo 'Incoming hash: '.$signature.LF;
    //echo 'Check hash   : '.$check_signature.LF;

    return !is_null($signature)
        && !is_null($check_signature)
        && strlen($signature) > 16
        && strlen($check_signature) > 16
        && $signature === $check_signature;
}

class RegExOpt {
    var $pattern;
    var $options;
    var $regex_delimiter;

    function __construct(string $pattern, string $options = '', $regex_delimiter = '/') {
        $this->pattern = $pattern;
        $this->options = $options;
        $this->regex_delimiter = $regex_delimiter;
    }

    function __toString() {
        return $this->regex_delimiter
            . str_replace($this->regex_delimiter, '\\'.$this->regex_delimiter, $this->pattern)
            . $this->regex_delimiter
            . $this->options;
    }
}


enum opt_required: int {
    case YES = 1;
    case NO = 0;
}

function meeseeks_getopt_flag(array $argv, string|array $option, opt_required $required = opt_required::NO): bool {
    is_array($option) OR $option = [$option];
    foreach($argv as $index => $arg) {
        if(in_array($arg, $option)) {
            return true;
        }
    }
    if($required == opt_required::YES) {
        cmd_help(help_reason::OPTION_ERROR, $option);
    }
    return false;
}

function meeseeks_getopt_value(array $argv, string|array $option_pattern, opt_required $required = opt_required::NO, $regex_delimiter = '/'): string {
    is_array($option_pattern) OR $option_pattern = [$option_pattern];

    // In this loop, "arg" means an actual user-provided CLI argument
    // from argv, and "option" means the program-requested to opt to
    // search for.

    // Check each user-provided argument to see if it was the one(s) requested
    foreach($argv as $index => $arg) {
        // First search to see if it is in the array of options explicitly
        if(in_array($arg, $option_pattern)) {
            if($index+1 < count($argv)) {
                return $argv[$index+1];
            } else {
                goto not_found;
            }
        } else {
            // Next, check if any of the options are patterns; and if so if
            // they match this user-provided argument
            foreach($option_pattern as $pattern) {
                // RegExOpt instances are the clearest way to provide parameters,
                // and the only way if you need to use options. We will also
                // handle strings that start and end with the regex delimiter.
                if($pattern instanceof RegExOpt || (substr($pattern, 0, 1) == $regex_delimiter && substr($pattern, -1, 1) == $regex_delimiter)) {
                    // it looks like a regex so let's try to match it
                    if(preg_match($pattern, $arg, $matches)) {
                        // No subpatterns?
                        if(count($matches) == 1) {
                            // Get next argument or return empty string
                            if($index+1 < count($argv)) {
                                return $argv[$index+1];
                            } else {
                                goto not_found;
                            }
                        } else {
                            // Return the match
                            return $matches[1];
                        }

                    }
                } // if($pattern <is a regex>)
            } // foreach($option_pattern as $pattern)
        } // else if(in_array($arg, $option_pattern))
    } // foreach($argv as $index => $arg)


not_found:
    if($required == opt_required::YES) {
        meeseeks_error(900, 'Option '.implode(' or ', $option_pattern).(count($option_pattern) > 1 ? ' are' : ' is').' required');
    }
    return '';
} // function meeseeks_getopt_value()

enum help_reason: int {
    case REQUESTED = 0;
    case MISSING = 1;
    case INVALID = 2;
    case OPTION_ERROR = 3;
}

function cmd_help(help_reason $reason = help_reason::REQUESTED, array $missing_options = []) {
    echo LF;
    $look_at_me = '= "I\'m Mr. Meeseeks the PHP Encryption Tool, look at me!"';
    echo str_repeat('=', 80).LF;
    echo '||'.$look_at_me.str_repeat(' ', 80-strlen($look_at_me)-4).'||'.LF;
    echo str_repeat('=', 80).LF;

    if(in_array($reason, [help_reason::INVALID, help_reason::MISSING])) {
        echo LF;
        echo 'Gosh I\'d love to help with your golf swing, but ';
        if($reason === help_reason::INVALID) echo 'I don\'t know that commaaaaaand!'.LF;
        if($reason === help_reason::MISSING) echo 'you didn\'t enter a commaaaaaand!'.LF;
    }

    if($reason === help_reason::OPTION_ERROR) {
        echo LF;
        echo (count($missing_options) > 1 ? '  Error: One of the options `' : 'The option `')
                .implode('` or `', $missing_options).(count($missing_options) > 1 ? '` are' : '` is')
                .' required.';
        echo LF;
    }
    if(defined('IS_SELF_EXTRACTING_FILE_ARCHIVE')) {
        echo LF;
        echo '[Self Extract]'.LF;
        echo 'Since this is a self extracting file you can run it by doing this:'.LF;
        echo '  php ./file_name.meeseeks decrypt -k $KEY'.LF;
        echo LF;
    }

    echo LF;
    echo '[Usage]'.LF;
    echo 'Generate a secure random key of 32 HEX bytes. Example, which may or may not be secure on your system:'.LF;
    echo LF;
    echo '  KEY=`head -c16 </dev/urandom|xxd -p -u`; echo $KEY;'.LF;
    echo LF;
    echo LF;
    echo '[Encrypt a File]'.LF;
    echo 'To encrypt a file named file_name with this key and save it to file_name.meeseeks'.LF;
    echo '(overwriting that file if it exists), you would then run: '.LF;
    echo '  php ./meeseeks.php encrypt $KEY meeseeks'.LF;
    echo LF;
    echo LF;
    echo '[Decrypt a File]'.LF;
    echo 'To decrypt a file named file_name.meeseeks with the same key, and save the plaintext file to'.LF;
    echo 'file_name (overwriting that file if it exists), you would then run: '.LF;
    echo '  php ./meeseeks.php decrypt $KEY file_name.meeseeks'.LF;
    exit;
}

function cmd_encrypt(array $argv) {
    $p_key  = meeseeks_getopt_value($argv, ['-k', '-key'], opt_required::YES);
    $p_file_in  = meeseeks_getopt_value($argv, ['-f', '-in'], opt_required::YES);
    $p_file_out = $p_file_in.'.meeseeks';

    if(meeseeks_getopt_flag($argv, '-v')) {
        echo '-- encrypt --'.LF;
        echo 'Key: '.$p_key.LF;
        echo 'Encrypt file: '.$p_file_in.LF;
        echo 'Output file: '.$p_file_out.LF;
    }

    file_put_contents($p_file_out, str_replace("<?php define('IS_SELF_EXTRACTING_FILE_ARCHIVE', true);
/* Hey there, I am a self extracting archive built with meeseeks.php, look at me!
   Seriously, you can see how this file was built by reading the code
   below. This file requires PHP 8.1 or higher. */
", "<?php define('IS_SELF_EXTRACTING_FILE_ARCHIVE', true);
/* Hey there, I am a self extracting archive built with meeseeks.php, look at me!
   Seriously, you can see how this file was built by reading the code
   below. This file requires PHP 8.1 or higher. */
 define('IS_SELF_EXTRACTING_FILE_ARCHIVE', true); ".LF
                                                        ."/* Hey there, I am a self extracting archive built with meeseeks.php, look at me!".LF
                                                        ."   Seriously, you can see how this file was built by reading the code".LF
                                                        ."   below. This file requires PHP 8.1 or higher. */".LF,
                                                        file_get_contents(__FILE__))
                                                        .'#'.md5('start_of_data')
                                                        .meeseeks_encrypt($p_key, file_get_contents($p_file_in)));
}

function cmd_decrypt(array $argv) {
    $p_key  = meeseeks_getopt_value($argv, ['-k', '-key'], opt_required::YES);
    if(defined('IS_SELF_EXTRACTING_FILE_ARCHIVE')) {
        $p_file_in  = __FILE__;
    } else {
        $p_file_in  = meeseeks_getopt_value($argv, ['-f', '-in'], opt_required::YES);
    }
    $p_file_out = str_replace('.meeseeks', '', $p_file_in);

    if(meeseeks_getopt_flag($argv, '-v')) {
        echo '-- decrypt --'.LF;
        echo 'Key: '.$p_key.LF;
        echo 'Decrypt file: '.$p_file_in.LF;
        echo 'Output file: '.$p_file_out.LF;
    }

    $cypher_text = file_get_contents($p_file_in);
    $data_start = '#'.md5('start_of_data');
    if(($data_pos = strpos($cypher_text, $data_start)) !== false) {
        $data_pos += strlen($data_start);
        echo 'Extracting data from file at position '.$data_pos.LF;
        echo substr($cypher_text, $data_pos, 30).LF.LF;
        $cypher_text = substr($cypher_text, $data_pos);
    }

    file_put_contents($p_file_out, meeseeks_decrypt($p_key, $cypher_text));
}

function main(int $argc, array $argv) {
    meeseeks_sanitize($argv);

    $p_cmd = meeseeks_getopt_value($argv, ['-c', new RegExOpt(pattern: '.+\.php'), new RegExOpt(pattern: '.+\.meeseeks')]);

    if(meeseeks_getopt_flag($argv, ['-h', '-help'])) $p_cmd = 'help';

    $commands = ['encrypt', 'decrypt', 'help'];

    if(in_array($p_cmd, $commands)) {
        $exec = 'cmd_'.$p_cmd;
        $exec($argv);
    } else {
        if(strlen($p_cmd) > 0) {
            cmd_help(help_reason::INVALID);
        } else {
            cmd_help(help_reason::MISSING);
        }
    }

}

main($argc, $argv);
exit(0);
?>
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HX0=
	<?php
	// I'm Mr. Meeseeks the PHP Encryption Tool, look at me!
	//
	// Cobbled together with great trepidation by Blueapples.
	//
	// Visit me at Blueapples.org
	//
	// Version 1.0, 2022-09-26.

	define('LF', "\n");

	function meeseeks_error(int $code, string\|array\|object $message = 'Unknown error') {
	echo str_repeat('!', 80).LF;
	if(is_array($message) \|\| is_object($message)) $message = json_encode($message);
	echo 'MEESEEKS ERROR #'.$code.': '.$message.LF.LF;
	exit;
	}
	function meeseeks_sanitize(array &$data) {
	foreach($data as $k => $v) {
	if(strpos(strtolower($k), 'email') !== FALSE) {
	$v = filter_var($v, FILTER_SANITIZE_EMAIL);
	}
	$v = str_replace(LF, '\|EOL\|', $v);
	$v = strip_tags($v);
	$v = filter_var($v, FILTER_SANITIZE_SPECIAL_CHARS, FILTER_FLAG_STRIP_LOW\|FILTER_FLAG_STRIP_HIGH);
	$data[$k] = $v;
	}
	}

	function meeseeks_implode($data) {
	if(!is_array($data) && !is_object($data)) {
	exit(meeseeks_error(600, 'Cannot implode non-array/non-object value:'.$data));
	}
	$type = is_object($data) ? 'OBJ' : 'ARR';
	$data = (array)$data;
	ksort($data);
	$result = 'MEESEEKS<0>';
	$result .= $type.'<0>';
	$result .= implode('<1>', array_keys($data)).'<0>';
	$result .= implode('<1>', $data).'<0>';
	$result .= md5($result).'<0>';
	return $result;
	}

	function meeseeks_explode($str) {
	$data = explode('<0>', $str);
	$sig = $data[0];
	$type = $data[1];
	$keys = $data[2];
	$vals = $data[3];
	$hash = $data[4];
	if($sig !== 'MEESEEKS') {
	exit(meeseeks_error(700, ['err' => 'Invalid MV signature (should be MEESEEKS)', 'str' => $str]));
	}
	$keys = explode('<1>', $keys);
	$vals = explode('<1>', $vals);
	if(count($keys) !== count($vals)) {
	exit(meeseeks_error(701, ['err' => 'Parallel arrays differ in length', 'str' => $str]));
	}
	$result = array_combine($keys, $vals);
	switch($type) {
	case 'ARR':
	break;
	case 'OBJ':
	$result = (object)$result;
	break;
	default:
	exit(meeseeks_error(702, ['err' => 'Invalid type', 'str' => $str]));
	}
	return $result;
	}


	class UnsafeCrypto
	{
	const METHOD = 'aes-256-ctr';

	/**
	* Encrypts (but does not authenticate) a message
	*
	* @param string $message - plaintext message
	* @param string $key - encryption key (raw binary expected)
	* @param boolean $encode - set to TRUE to return a base64-encoded
	* @return string (raw binary)
	*/
	public static function encrypt($message, $key, $encode = false)
	{
	$nonceSize = openssl_cipher_iv_length(self::METHOD);
	$nonce = openssl_random_pseudo_bytes($nonceSize);

	$ciphertext = openssl_encrypt(
	$message,
	self::METHOD,
	$key,
	OPENSSL_RAW_DATA,
	$nonce
	);

	// Now let's pack the IV and the ciphertext together
	// Naively, we can just concatenate
	if ($encode) {
	return base64_encode($nonce.$ciphertext);
	}
	return $nonce.$ciphertext;
	}

	/**
	* Decrypts (but does not verify) a message
	*
	* @param string $message - ciphertext message
	* @param string $key - encryption key (raw binary expected)
	* @param boolean $encoded - are we expecting an encoded string?
	* @return string
	*/
	public static function decrypt($message, $key, $encoded = false)
	{
	if ($encoded) {
	$message = base64_decode($message, true);
	if ($message === false) {
	throw new Exception('Encryption failure');
	}
	}

	$nonceSize = openssl_cipher_iv_length(self::METHOD);
	$nonce = mb_substr($message, 0, $nonceSize, '8bit');
	$ciphertext = mb_substr($message, $nonceSize, null, '8bit');

	$plaintext = openssl_decrypt(
	$ciphertext,
	self::METHOD,
	$key,
	OPENSSL_RAW_DATA,
	$nonce
	);

	return $plaintext;
	}
	}

	class SaferCrypto extends UnsafeCrypto
	{
	const HASH_ALGO = 'sha256';

	/**
	* Encrypts then MACs a message
	*
	* @param string $message - plaintext message
	* @param string $key - encryption key (raw binary expected)
	* @param boolean $encode - set to TRUE to return a base64-encoded string
	* @return string (raw binary)
	*/
	public static function encrypt($message, $key, $encode = false)
	{
	list($encKey, $authKey) = self::splitKeys($key);

	// Pass to UnsafeCrypto::encrypt
	$ciphertext = parent::encrypt($message, $encKey);

	// Calculate a MAC of the IV and ciphertext
	$mac = hash_hmac(self::HASH_ALGO, $ciphertext, $authKey, true);

	if ($encode) {
	return base64_encode($mac.$ciphertext);
	}
	// Prepend MAC to the ciphertext and return to caller
	return $mac.$ciphertext;
	}

	/**
	* Decrypts a message (after verifying integrity)
	*
	* @param string $message - ciphertext message
	* @param string $key - encryption key (raw binary expected)
	* @param boolean $encoded - are we expecting an encoded string?
	* @return string (raw binary)
	*/
	public static function decrypt($message, $key, $encoded = false)
	{
	list($encKey, $authKey) = self::splitKeys($key);
	if ($encoded) {
	$message = base64_decode($message, true);
	if ($message === false) {
	throw new Exception('Encryption failure');
	}
	}

	// Hash Size -- in case HASH_ALGO is changed
	$hs = mb_strlen(hash(self::HASH_ALGO, '', true), '8bit');
	$mac = mb_substr($message, 0, $hs, '8bit');

	$ciphertext = mb_substr($message, $hs, null, '8bit');

	$calculated = hash_hmac(
	self::HASH_ALGO,
	$ciphertext,
	$authKey,
	true
	);

	if (!self::hashEquals($mac, $calculated)) {
	throw new Exception('Encryption failure');
	}

	// Pass to UnsafeCrypto::decrypt
	$plaintext = parent::decrypt($ciphertext, $encKey);

	return $plaintext;
	}

	/**
	* Splits a key into two separate keys; one for encryption
	* and the other for authenticaiton
	*
	* @param string $masterKey (raw binary)
	* @return array (two raw binary strings)
	*/
	protected static function splitKeys($masterKey)
	{
	// You really want to implement HKDF here instead!
	return [
	hash_hmac(self::HASH_ALGO, 'ENCRYPTION', $masterKey, true),
	hash_hmac(self::HASH_ALGO, 'AUTHENTICATION', $masterKey, true)
	];
	}

	/**
	* Compare two strings without leaking timing information
	*
	* @param string $a
	* @param string $b
	* @ref https://paragonie.com/b/WS1DLx6BnpsdaVQW
	* @return boolean
	*/
	protected static function hashEquals($a, $b)
	{
	if (function_exists('hash_equals')) {
	return hash_equals($a, $b);
	}
	$nonce = openssl_random_pseudo_bytes(32);
	return hash_hmac(self::HASH_ALGO, $a, $nonce) === hash_hmac(self::HASH_ALGO, $b, $nonce);
	}
	}

	function meeseeks_encrypt(string $key, string\|array\|object $data) {
	if(strlen($key) < 32) {
	echo$key.LF;
	exit(meeseeks_error(604, 'Encrypt key is not long enough: '.strlen($key)));
	}
	if(is_object($data) \|\| is_array($data)) {
	$data = json_encode($data);
	}
	return chunk_split(base64_encode(SaferCrypto::encrypt($data, $key)), separator: LF);
	}

	function meeseeks_decrypt(string $key, string $data, string\|array\|object $default=NULL, bool $throwException=FALSE): string\|array\|object {
	if(strlen($key) < 32) {
	exit(meeseeks_error(604, 'Decrypt key is not long enough: '.strlen($key)));
	}
	try {
	$data = SaferCrypto::decrypt(base64_decode($data), $key);
	if(substr($data, 0, 1) == '{'
	\|\|substr($data, 0, 1) == '[') {
	$data = json_decode($data);
	}
	} catch(Exception $e) {
	if($throwException) {
	throw $e;
	}
	return $default;
	}
	return $data;
	}

	function meeseeks_signdata(string $sig_key, string\|array\|object &$data): string\|array\|object {
	if(is_object($data) \|\| is_array($data)) {
	// turn array or object into string
	$signature = meeseeks_implode($data);
	}

	// hash the string
	$signature = md5($signature);

	//echo 'Outgoing hash: '.$signature.LF;
	// encrypt the hash
	$signature = meeseeks_encrypt($signature, $sig_key);
	//echo 'Outgoing encrypted hash: '.$signature.LF;

	if(strlen(meeseeks_decrypt($signature, $sig_key)) !== 32) {
	exit(meeseeks_error(601, 'Generated signature is invalid length'));
	}

	// make signature easier to read
	$signature = trim(str_replace('=', '', chunk_split($signature, 8, ' ')));

	//echo 'Outgoing encrypted hash: '.$signature;
	// add signature to incoming data
	if(is_object($data)) {
	$data->signature = $signature;
	} elseif(is_array($data)) {
	$data['signature'] = $signature;
	} else {
	$data .= '<0>'.$signature;
	}
	return $signature;
	}

	function meeseeks_signcheck(string $sig_key, string\|array\|object $data): bool {
	// get signature from the data
	// we also need to unset it from our
	// copy so we can recalculate the correct
	// hash
	$data = clone $data;
	if(is_array($data)) {
	$signature = $data['signature'];
	unset($data['signature']);
	} elseif(is_object($data)) {
	$signature = $data->signature;
	unset($data->signature);
	} else {
	$data = explode('<0>', $data);
	$signature = array_pop($data);
	$data = implode('<0>', $data);
	}

	// turn array or object into string
	if(is_object($data) \|\| is_array($object)) {
	$data = meeseeks_implode($data);
	}

	// hash the string
	$check_signature = md5($data);
	//echo 'Incoming encrypted hash: '.$signature;

	// decrypt the incoming hash
	$signature = meeseeks_decrypt($signature, $sig_key);
	//echo 'Incoming hash: '.$signature.LF;
	//echo 'Check hash : '.$check_signature.LF;

	return !is_null($signature)
	&& !is_null($check_signature)
	&& strlen($signature) > 16
	&& strlen($check_signature) > 16
	&& $signature === $check_signature;
	}

	class RegExOpt {
	var $pattern;
	var $options;
	var $regex_delimiter;

	function __construct(string $pattern, string $options = '', $regex_delimiter = '/') {
	$this->pattern = $pattern;
	$this->options = $options;
	$this->regex_delimiter = $regex_delimiter;
	}

	function __toString() {
	return $this->regex_delimiter
	. str_replace($this->regex_delimiter, '\\'.$this->regex_delimiter, $this->pattern)
	. $this->regex_delimiter
	. $this->options;
	}
	}


	enum opt_required: int {
	case YES = 1;
	case NO = 0;
	}

	function meeseeks_getopt_flag(array $argv, string\|array $option, opt_required $required = opt_required::NO): bool {
	is_array($option) OR $option = [$option];
	foreach($argv as $index => $arg) {
	if(in_array($arg, $option)) {
	return true;
	}
	}
	if($required == opt_required::YES) {
	cmd_help(help_reason::OPTION_ERROR, $option);
	}
	return false;
	}

	function meeseeks_getopt_value(array $argv, string\|array $option_pattern, opt_required $required = opt_required::NO, $regex_delimiter = '/'): string {
	is_array($option_pattern) OR $option_pattern = [$option_pattern];

	// In this loop, "arg" means an actual user-provided CLI argument
	// from argv, and "option" means the program-requested to opt to
	// search for.

	// Check each user-provided argument to see if it was the one(s) requested
	foreach($argv as $index => $arg) {
	// First search to see if it is in the array of options explicitly
	if(in_array($arg, $option_pattern)) {
	if($index+1 < count($argv)) {
	return $argv[$index+1];
	} else {
	goto not_found;
	}
	} else {
	// Next, check if any of the options are patterns; and if so if
	// they match this user-provided argument
	foreach($option_pattern as $pattern) {
	// RegExOpt instances are the clearest way to provide parameters,
	// and the only way if you need to use options. We will also
	// handle strings that start and end with the regex delimiter.
	if($pattern instanceof RegExOpt \|\| (substr($pattern, 0, 1) == $regex_delimiter && substr($pattern, -1, 1) == $regex_delimiter)) {
	// it looks like a regex so let's try to match it
	if(preg_match($pattern, $arg, $matches)) {
	// No subpatterns?
	if(count($matches) == 1) {
	// Get next argument or return empty string
	if($index+1 < count($argv)) {
	return $argv[$index+1];
	} else {
	goto not_found;
	}
	} else {
	// Return the match
	return $matches[1];
	}

	}
	} // if($pattern <is a regex>)
	} // foreach($option_pattern as $pattern)
	} // else if(in_array($arg, $option_pattern))
	} // foreach($argv as $index => $arg)


	not_found:
	if($required == opt_required::YES) {
	meeseeks_error(900, 'Option '.implode(' or ', $option_pattern).(count($option_pattern) > 1 ? ' are' : ' is').' required');
	}
	return '';
	} // function meeseeks_getopt_value()

	enum help_reason: int {
	case REQUESTED = 0;
	case MISSING = 1;
	case INVALID = 2;
	case OPTION_ERROR = 3;
	}

	function cmd_help(help_reason $reason = help_reason::REQUESTED, array $missing_options = []) {
	echo LF;
	$look_at_me = '= "I\'m Mr. Meeseeks the PHP Encryption Tool, look at me!"';
	echo str_repeat('=', 80).LF;
	echo '\|\|'.$look_at_me.str_repeat(' ', 80-strlen($look_at_me)-4).'\|\|'.LF;
	echo str_repeat('=', 80).LF;

	if(in_array($reason, [help_reason::INVALID, help_reason::MISSING])) {
	echo LF;
	echo 'Gosh I\'d love to help with your golf swing, but ';
	if($reason === help_reason::INVALID) echo 'I don\'t know that commaaaaaand!'.LF;
	if($reason === help_reason::MISSING) echo 'you didn\'t enter a commaaaaaand!'.LF;
	}

	if($reason === help_reason::OPTION_ERROR) {
	echo LF;
	echo (count($missing_options) > 1 ? ' Error: One of the options `' : 'The option `')
	.implode('` or `', $missing_options).(count($missing_options) > 1 ? '` are' : '` is')
	.' required.';
	echo LF;
	}
	if(defined('IS_SELF_EXTRACTING_FILE_ARCHIVE')) {
	echo LF;
	echo '[Self Extract]'.LF;
	echo 'Since this is a self extracting file you can run it by doing this:'.LF;
	echo ' php ./file_name.meeseeks decrypt -k $KEY'.LF;
	echo LF;
	}

	echo LF;
	echo '[Usage]'.LF;
	echo 'Generate a secure random key of 32 HEX bytes. Example, which may or may not be secure on your system:'.LF;
	echo LF;
	echo ' KEY=`head -c16 </dev/urandom\|xxd -p -u`; echo $KEY;'.LF;
	echo LF;
	echo LF;
	echo '[Encrypt a File]'.LF;
	echo 'To encrypt a file named file_name with this key and save it to file_name.meeseeks'.LF;
	echo '(overwriting that file if it exists), you would then run: '.LF;
	echo ' php ./meeseeks.php encrypt $KEY meeseeks'.LF;
	echo LF;
	echo LF;
	echo '[Decrypt a File]'.LF;
	echo 'To decrypt a file named file_name.meeseeks with the same key, and save the plaintext file to'.LF;
	echo 'file_name (overwriting that file if it exists), you would then run: '.LF;
	echo ' php ./meeseeks.php decrypt $KEY file_name.meeseeks'.LF;
	exit;
	}

	function cmd_encrypt(array $argv) {
	$p_key = meeseeks_getopt_value($argv, ['-k', '-key'], opt_required::YES);
	$p_file_in = meeseeks_getopt_value($argv, ['-f', '-in'], opt_required::YES);
	$p_file_out = $p_file_in.'.meeseeks';

	if(meeseeks_getopt_flag($argv, '-v')) {
	echo '-- encrypt --'.LF;
	echo 'Key: '.$p_key.LF;
	echo 'Encrypt file: '.$p_file_in.LF;
	echo 'Output file: '.$p_file_out.LF;
	}

	file_put_contents($p_file_out, str_replace("<?php", "<?php define('IS_SELF_EXTRACTING_FILE_ARCHIVE', true); ".LF
	."/* Hey there, I am a self extracting archive built with meeseeks.php, look at me!".LF
	." Seriously, you can see how this file was built by reading the code".LF
	." below. This file requires PHP 8.1 or higher. */".LF,
	file_get_contents(__FILE__))
	.'#'.md5('start_of_data')
	.meeseeks_encrypt($p_key, file_get_contents($p_file_in)));
	}

	function cmd_decrypt(array $argv) {
	$p_key = meeseeks_getopt_value($argv, ['-k', '-key'], opt_required::YES);
	if(defined('IS_SELF_EXTRACTING_FILE_ARCHIVE')) {
	$p_file_in = __FILE__;
	} else {
	$p_file_in = meeseeks_getopt_value($argv, ['-f', '-in'], opt_required::YES);
	}
	$p_file_out = str_replace('.meeseeks', '', $p_file_in);

	if(meeseeks_getopt_flag($argv, '-v')) {
	echo '-- decrypt --'.LF;
	echo 'Key: '.$p_key.LF;
	echo 'Decrypt file: '.$p_file_in.LF;
	echo 'Output file: '.$p_file_out.LF;
	}

	$cypher_text = file_get_contents($p_file_in);
	$data_start = '#'.md5('start_of_data');
	if(($data_pos = strpos($cypher_text, $data_start)) !== false) {
	$data_pos += strlen($data_start);
	echo 'Extracting data from file at position '.$data_pos.LF;
	echo substr($cypher_text, $data_pos, 30).LF.LF;
	$cypher_text = substr($cypher_text, $data_pos);
	}

	file_put_contents($p_file_out, meeseeks_decrypt($p_key, $cypher_text));
	}

	function main(int $argc, array $argv) {
	meeseeks_sanitize($argv);

	$p_cmd = meeseeks_getopt_value($argv, ['-c', new RegExOpt(pattern: '.+\.php'), new RegExOpt(pattern: '.+\.meeseeks')]);

	if(meeseeks_getopt_flag($argv, ['-h', '-help'])) $p_cmd = 'help';

	$commands = ['encrypt', 'decrypt', 'help'];

	if(in_array($p_cmd, $commands)) {
	$exec = 'cmd_'.$p_cmd;
	$exec($argv);
	} else {
	if(strlen($p_cmd) > 0) {
	cmd_help(help_reason::INVALID);
	} else {
	cmd_help(help_reason::MISSING);
	}
	}

	}

	main($argc, $argv);
	exit(0);
	?>