PHP中使用AES加密算法加密数据的例子

$privateKey = "1234567812345678";
$iv = "1234567812345678";
$data = "Test String";

//加密
$encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $privateKey, $data, MCRYPT_MODE_CBC, $iv);
echo(base64_encode($encrypted));
echo '
';

//解密
$encryptedData = base64_decode("2fbwW9+8vPId2/foafZq6Q==");
$decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $privateKey, $encryptedData, MCRYPT_MODE_CBC, $iv);
echo($decrypted);
?>

//加密   
$key = '1234567890123456';   
$content = 'hello';   
$padkey = pad2Length($key,16);   
$cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');   
$iv_size = mcrypt_enc_get_iv_size($cipher);   
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); #IV自动生成？   
echo '自动生成iv的长度:'.strlen($iv).'位:'.bin2hex($iv).'
';   
if (mcrypt_generic_init($cipher, pad2Length($key,16), $iv) != -1)   
{   
   // PHP pads with NULL bytes if $content is not a multiple of the block size..   
   $cipherText = mcrypt_generic($cipher,pad2Length($content,16) );   
   mcrypt_generic_deinit($cipher);   
   mcrypt_module_close($cipher);   
    
   // Display the result in hex.   
   printf("128-bit encrypted result:n%snn",bin2hex($cipherText));   
   print("
");   
    
}   
//解密   
$mw = bin2hex($cipherText);   
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');   
if (mcrypt_generic_init($td, $padkey, $iv) != -1)   
{   
   $p_t = mdecrypt_generic($td, hexToStr($mw));   
   mcrypt_generic_deinit($td);   
   mcrypt_module_close($td);   
    
   $p_t = trimEnd($p_t);   
   echo '解密:';   
   print($p_t);   
   print("
");   
   print(bin2hex($p_t));   
   echo '

';   
}   
//将$text补足$padlen倍数的长度   
function pad2Length($text, $padlen){   
   $len = strlen($text)%$padlen;   
   $res = $text;   
   $span = $padlen-$len;   
   for($i=0; $i<$span; $i++){   
       $res .= chr($span);   
   }   
   return $res;   
}   
//将解密后多余的长度去掉(因为在加密的时候 补充长度满足block_size的长度)   
function trimEnd($text){   
   $len = strlen($text);   
   $c = $text[$len-1];   
   if(ord($c) <$len){   
       for($i=$len-ord($c); $i<$len; $i++){   
           if($text[$i] != $c){   
               return $text;   
           }   
       }   
       return substr($text, 0, $len-ord($c));   
   }   
   return $text;   
}   
//16进制的转为2进制字符串   
function hexToStr($hex)   
{   
   $bin="";   
   for($i=0; $i    {   
       $bin.=chr(hexdec($hex[$i].$hex[$i+1]));   
   }   
   return $bin;   
}   

$key = '1234567890123456';   
$key = pad2Length($key,16);   
$iv = 'asdff';   
$content = 'hello';   
$content = pad2Length($content,16);   
$AESed =  bin2hex( mcrypt_encrypt(MCRYPT_RIJNDAEL_128,$key,$content,MCRYPT_MODE_ECB,$iv) ); #加密   
echo "128-bit encrypted result:".$AESed.'
';   
$jiemi = mcrypt_decrypt(MCRYPT_RIJNDAEL_128,$key,hexToStr($AESed),MCRYPT_MODE_ECB,$iv); #解密   
echo '解密:';   
echo trimEnd($jiemi);     
?>