在PHP中加密字符串，其中输出是URL安全的

Question

I have a requirement where I need to move a string from one place to another via GET. e.g. example.com?string=ENCRYPTED_STRING

Is there a algorithm or some other method to encrypt the string so it is URL safe?

By that I mean it will not have characters like = or & ...

I have tried openssl with AES-256-CBC but no luck.

The data is not overly very sensitive but I would prefer to obfuscate it in someway.

Answer 1

The code below allow you to encrypt (alpha/num) and decrypt a string. But you need Mcrypt php module installed to make it run.

static public function encrypt($text){
    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);                                                                           
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $key = "useasuperkey";

    return (bin2hex(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv)));
}

static public function decrypt($text){
    $len = strlen($text);  
    $text = pack("H" . $len, $text);
    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);                                                                           
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $key = "useasuperkey";

    return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv));
}