本文实例讲述了PHP的AES加密算法。分享给大家供大家参考，具体如下：

class MCrypt {

private $hex_iv = '00000000000000000000000000000000'; # converted JAVA byte code in to HEX and placed it here

private $key = 'U1MjU1M0FDOUZ.Qz'; #Same as in JAVA

function __construct() {

$this->key = hash('sha256', $this->key, true);

//echo $this->key.'
';

}

function encrypt($str) {

$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');

mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));

$block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);

$pad = $block - (strlen($str) % $block);

$str .= str_repeat(chr($pad), $pad);

$encrypted = mcrypt_generic($td, $str);

mcrypt_generic_deinit($td);

mcrypt_module_close($td);

return base64_encode($encrypted);

}

function decrypt($code) {

$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');

mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));

$str = mdecrypt_generic($td, base64_decode($code));

$block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);

mcrypt_generic_deinit($td);

mcrypt_module_close($td);

return $this->strippadding($str);

}

/*

For PKCS7 padding

*/

private function addpadding($string, $blocksize = 16) {

$len = strlen($string);

$pad = $blocksize - ($len % $blocksize);

$string .= str_repeat(chr($pad), $pad);

return $string;

}

private function strippadding($string) {

$slast = ord(substr($string, -1));

$slastc = chr($slast);

$pcheck = substr($string, -$slast);

if (preg_match("/$slastc{" . $slast . "}/", $string)) {

$string = substr($string, 0, strlen($string) - $slast);

return $string;

} else {

return false;

}

}

function hexToStr($hex)

{

$string='';

for ($i=0; $i < strlen($hex)-1; $i+=2)

{

$string .= chr(hexdec($hex[$i].$hex[$i+1]));

}

return $string;

}

}

$encryption = new MCrypt();

echo $encryption->encrypt('123456') . "
";

echo $encryption->decrypt('tpyxISJ83dqEs3uw8bN/+w==');

?>

希望本文所述对大家PHP程序设计有所帮助。