PHP AES加密学习笔记

';  
    printf("128-bit encrypted result:\n%s\n\n",bin2hex($cipherText));  
    echo '
';echo '
';  
}  
//--------第一种AES加密方案--------  
?> 

';  
$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%s\n\n",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
';  
$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);  
//--------第三种AES加密方案--------  
?>
#KEY长度无限制，IV长度必须是block_size的倍数
#如果是MCRYPT_MODE_ECB加密，结果与KEY有关，与IV无关
#如果是MCRYPT_MODE_CBC加密，结果与KEY有关，与IV有关