2

我一直在编写一些软件，它使用“随机”字符串来创建用于 URL 的确认密钥哈希。试图让最终用户看不到请求的 ID 号。一段时间以来，我一直在使用 crypt 代码：http ://blog.kevburnsjr.com/php-unique-hash ，它使用了一些黄金素数，我正在对请求的 ID 号进行哈希处理。我的问题是，自从从 32 位服务器切换到 64 位服务器后，这个 5 个字符的哈希现在被复制了。

考虑切换到 base 36 编码，但这有可能在 100 万个条目后再次复制自身。并不是说我计划有 100 万个条目，但谁知道呢。（3 年后已经有多达 9600 个条目）。

创建“哈希”以隐藏将创建无冲突环境的请求的主要 ID 号的最佳方法是什么？

在这一点上，我不担心长度，即使它是 5 个字符，它可能会与现在的内容产生冲突。

4

3 回答 3

3

请参阅少数有用的 PHP 手册注释之一：http : //www.php.net/manual/en/function.uniqid.php#94959，它生成符合 UUIDv4 的标识符。

function v4()
{
    return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',

      // 32 bits for "time_low"
      mt_rand(0, 0xffff), mt_rand(0, 0xffff),

      // 16 bits for "time_mid"
      mt_rand(0, 0xffff),

      // 16 bits for "time_hi_and_version",
      // four most significant bits holds version number 4
      mt_rand(0, 0x0fff) | 0x4000,

      // 16 bits, 8 bits for "clk_seq_hi_res",
      // 8 bits for "clk_seq_low",
      // two most significant bits holds zero and one for variant DCE1.1
      mt_rand(0, 0x3fff) | 0x8000,

      // 48 bits for "node"
      mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
    );
}

请注意，这mt_rand不是很好，您可能更喜欢openssl_random_pseudo_bytes在它的位置使用。

于 2012-09-04T20:13:27.637 回答
1

这可能是你所追求的：

<?php
// You should create your own salt (hand-typed), and
// ideally, it should be the same length as the hash
// (e.g. for SHA512, it should be 512 chars long).
$salt = 'hi48hO*$H84hOhe8o4hnioH$*oihnO$8hOHTO84HoihOhno$i*HOIHNOh$Oh48oh$';
for($i = 0; $i < 100; $i++) {
    $random = hash('sha512', mt_rand() . microtime() . mt_rand() . $salt);
    echo $random;
}
?>

这产生了非常独特的价值。例如：

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我在这里做了一个例子。

于 2012-09-04T20:08:16.820 回答
-3

我用这个：

define('SALT', '@my#secret');
$hash = MD5( SALT . Uniqid() );
于 2012-09-04T20:06:46.177 回答