Question

我有这个代码，它可以在一台服务器上运行（不是localhost）。我已经使用Ctl-A和Ctl-V将它放入另一台不同服务器的页面中，它不起作用（localhost）。我只是得到一个白色的空白页面。如果我注释掉它的PHP它工作正常，但如果甚至第一个变量没有注释......没有。怎么了？

<?php
/*
 * PHP 5.3.18 on windows XP
 *
 * I don't have open_ssl active from PHP so used MCRYPT_RAND for the salt.
 * It is adequate for this exercise.
 *
 * As the encoded SALT and encrypted output are binary code i have converted all
 * the output to Base64 encoding to ensure it is HTML safe.
 *
 * It selects the appropriate default action in the 'do' select list.
 *
 * There is a new 'salt' generated at each encryption and the user is prevented from
 * changing it by making the display field as 'readonly'. Normally this would be a 'hidden' field'.
 *
 */

$isEncrypted = null; // used to set default output options
                     // i like to pre-declare the script 'global' variables


$key_size = mcrypt_get_key_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CFB);
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CFB);


if($_POST){ // we have some input...
$encryption_key = $_POST["key"];
$string = $_POST["msg"]; // this may be base64 encoded...


if($_POST["do"]=="encrypt"){
    $isEncrypted = true; // used to set defaults

    $iv = mcrypt_create_iv($iv_size,  MCRYPT_RAND); // new salt with each encryption
    $result = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $encryption_key, $string, MCRYPT_MODE_CFB, $iv);
    $result = base64_encode($result); // $result is binary so encode as HTML safe.


}else{
    $isEncrypted = false; // used to set defaults

    $iv = base64_decode($_POST["iv"]); // get current salt converted back to binary format
    $string = base64_decode($string); // convert encoded text back to binary string
    $result = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $encryption_key, $string, MCRYPT_MODE_CFB, $iv);
}
}else{ // no input so create something useful...
  $isEncrypted = false; // used to set default actions

  $result = 'enter text to encrypt...'; // sample text
  $iv = mcrypt_create_iv($iv_size,  MCRYPT_RAND); // new salt
  $encryption_key = substr('testing!' . uniqid() . '!testing', 0, $key_size);
}
?>
<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Test Encryption with base64 encoding.</title>
  </head>

  <body>
    <div class="main" id="main">
    <!-- heading -->
    <strong><?php echo $isEncrypted ? 'Encrypted' : 'Decrypted'; ?></strong><br/>

    <form method="POST" action="">

        <!-- do not allow the user to change the salt by setting 'readonly' -->
        <input type="text" value="<?php echo base64_encode($iv); ?>" readonly name="iv"/> <br/>

        <!-- supply a suggested password but the user can change it -->
        <input type="text" value="<?php echo $encryption_key; ?>" name="key"/><br/>

        <!-- either show the encoded text as HTML safe string -->
        <!--- or show as plain text -->
        <textarea name="msg" ><?php echo $result; ?></textarea><br/>

        <!-- set the appropriate action as the default -->
        <select name="do">
          <option <?php echo $isEncrypted ? 'selected' : ''; ?>>decrypt</option>
          <option <?php echo $isEncrypted ? '' : 'selected'; ?>>encrypt</option>
        </select><br/>

        <input type="submit" value="GO"/>
    </form>
</div>
  </body>
</html>

Answer 1

mcrypt并不总是安装，所以如果它在一个环境而不是另一个环境中工作，我会把它押在上面：

http://php.net/manual/en/mcrypt.installation.php

相同的代码不能在不同的服务器上运行

1 个答案: