20c02-2.php

介绍PHP5的给类型函数应用

<?php
// Define our text, and our 'secret password'
$text = "The market price of our stock will greatly increase next week due
to us releasing the fact that we have made 3 million dollars more than our
original $300 profit estimate that we came up with.";
$secret = "The sparrow flies at midnight";

// Before encryption we need an Initialization Vector for the algorithm
$ivsize = mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($ivsize, MCRYPT_RAND);

// Now, encrypt this data using the Blowfish algorithm:
$enc = mcrypt_encrypt(MCRYPT_BLOWFISH, $secret, $text, MCRYPT_MODE_ECB, $iv);

// Let's echo out what the encrypted version looks like:
echo "<p>Encrypted:<br />{$enc}</p>";

// Generate a new Initialization Vector to decrypt it with.
$niv = mcrypt_create_iv($ivsize, MCRYPT_RAND);

// Now decrypt it again:
$dec = mcrypt_decrypt(MCRYPT_BLOWFISH, $secret, $enc, MCRYPT_MODE_ECB, $niv);

// Now display the decrypted version
echo "<p>Readable Again:<br />{$dec}</p>";
?>