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liukuan/hash.php

Forked from anonymous/hash.php
Created March 28, 2013 04:21
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Revisions

  1. @invalid-email-address Anonymous created this gist Mar 27, 2013.
    111 changes: 111 additions & 0 deletions hash.php
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,111 @@
    <?php

    /**
    * 加密 hash，生成发送给用户的 hash 字符串
    *
    * @param array $hash_data
    * @param string $hash_key
    * @return string
    */
    function encode_hash($hash_data, $hash_key = false)
    {
    if (!$hash_data)
    {
    return false;
    }

    foreach ($hash_data as $key => $value)
    {
    $hash_string .= $key . "^]+" . $value . "!;-";
    }

    $hash_string = substr($hash_string, 0, - 3);

    // 加密干扰码，加密解密时需要用到的 key
    if (! $hash_key)
    {
    $hash_key = G_COOKIE_HASH_KEY;
    }

    // 加密过程
    for ($i = 1; $i <= strlen($hash_string); $i ++)
    {
    $char = substr($hash_string, $i - 1, 1);
    $keychar = substr($hash_key, ($i % strlen($hash_key)) - 2, 1);
    $char = chr(ord($char) + ord($keychar));
    $tmp_str .= $char;
    }

    $hash_string = base64_encode($tmp_str);
    $hash_string = str_replace(array(
    '+',
    '/',
    '='
    ), array(
    '-',
    '_',
    '.'
    ), $hash_string);

    return $hash_string;
    }

    /**
    * 解密 hash，从用户回链的 hash 字符串解密出里面的内容
    *
    * @param string $hash_string
    * @return array
    */
    function decode_hash($hash_string, $hash_key = false)
    {
    if (!$hash_string)
    {
    return array();
    }

    // 加密干扰码，加密解密时需要用到的 Key
    if (! $hash_key)
    {
    $hash_key = G_COOKIE_HASH_KEY;
    }

    // 解密过程
    if (strpos($hash_string, '-') || strpos($hash_string, '_') || strpos($hash_string, '.'))
    {
    $hash_string = str_replace(array(
    '-',
    '_',
    '.'
    ), array(
    '+',
    '/',
    '='
    ), $hash_string);
    }

    $hash_string = base64_decode($hash_string);

    for ($i = 1; $i <= strlen($hash_string); $i ++)
    {
    $char = substr($hash_string, $i - 1, 1);
    $keychar = substr($hash_key, ($i % strlen($hash_key)) - 2, 1);
    $char = chr(ord($char) - ord($keychar));
    $tmp_str .= $char;
    }

    $hash_data = array();

    $arr = explode('!;-', $tmp_str);

    foreach ($arr as $value)
    {
    list($k, $v) = explode('^]+', $value);

    if ($k)
    {
    $hash_data[$k] = $v;
    }
    }

    return $hash_data;
    }