Question

我必须从增量号码（1到50000）和密码密码开始构建50,000个代码。我必须在php中完成它，最终代码必须是8或12个字符长，并且只包含大写字母（A-Z）和数字（0-9）。

最终代码必须是可解密，并带有密码...

我正在尝试使用openssl_encrypt，但我找不到一种方法来缩短最终代码。

$longCode = openssl_encrypt($number, $method, ENC_KEY, true, $iv);
$shortCode = .....

一些想法？

Answer 1

第一步是使用块大小为8字节的密码方法，例如， “RC2-CBC的”。

$nr = 1234;
$key = 'secretkey';
$method = 'rc2-cbc';

$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length($method));

$code = openssl_encrypt($nr, $method, $key, true, $iv);

第二步是将结果字符串转换为字母表;因为你的字母大小只有36，最接近和“简单”的转换是base32;这给了（在剥去可选填充之后）一串正好13个字符的字符串。

理论上，您可以将4个字节转换为base36的6个字符：

log(36) / log(2) ~ 5.17 bits, saves 1 bit after 6 blocks

6 x 5.17 ~ 31.02, 6 blocks fits inside 32 bits (unsigned long)

32 bits = 4 bytes -> 6 characters

执行错误

以下代码应该这样做 - 但不（始终）工作！

$final = '';
foreach (str_split($code, 4) as $part) {
    $x = current(unpack('L', $part));
    $final .= strtoupper(base_convert($x, 10, 36));
}

解码会像这样：

$code2 = '';
foreach (str_split($final, 6) as $part) {
        $code2 .= pack('L', base_convert(strtolower($part), 36, 10));
}

不知何故，整数精度无法处理它，或者我正在做一些愚蠢的事情;不管怎样，它并不总是有效。

Answer 2

试试这个：

// generate random ID
    function generateRandomID ($len) {
        //To Pull Unique Random Values Out Of AlphaNumeric
        //removed number 0, capital o, number 1 and small L
        //Total: keys = 32, elements = 33
        $characters = array(
        "A","B","C","D","E","F","G","H","J","K","L","M",
        "N","P","Q","R","S","T","U","V","W","X","Y","Z",
        "1","2","3","4","5","6","7","8","9");

        //make an "empty container" or array for our keys
        $keys = array();

        //first count of $keys is empty so "1", remaining count is 1-6 = total 7 times
        while(count($keys) < $len) {
                //"0" because we use this to FIND ARRAY KEYS which has a 0 value
                //"-1" because were only concerned of number of keys which is 32 not 33
                //count($characters) = 33
                $x = mt_rand(0, count($characters)-1);
                if(!in_array($x, $keys)) {
                     $keys[] = $x;
                }
        }

        foreach($keys as $key){
             $random_chars .= $characters[$key];
        }
        return $random_chars;
    }

编辑：删除了一些字母和数字以便用户更友好地阅读，请参阅代码中的注释。

从数字和密码开始构建短密码

2 个答案: