在 php 中生成 MAC ISOIEC 97971

确定MAC所需的步骤(根据算法3)为(here):

• 填充法(OP应用方法一)，S，here
• 输入/初始转换1，S.here和迭代，S.here.
• 输出转化3，S.here.
• 截断，S.here.

一种可能的PHP实现是(包括测试数据):

<?php
function xored($data1, $data2) {
    $result = '';
    for($n = 0; $n < strlen($data1); $n++){
        $result .= substr($data1, $n, 1) ^ substr($data2, $n, 1);
    }
    return $result;    
}

function encrypt($data, $key){
    return openssl_encrypt($data, 'DES-ECB', $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
}

function decrypt($data, $key){
    return openssl_decrypt($data, 'DES-ECB', $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
}

$messageHex = '54686520717569636b2062726f776e20666f78206a756d7073206f76657220746865206c617a7920646f67';
$message = hex2bin($messageHex);

// get 1st and 2nd DES key
$keyHex = '04984575FE4A526123D6F876B3E3371A';
$key = hex2bin($keyHex);
$desKey1 = substr($key, 0, 8);
$desKey2 = substr($key, 8, 16);

// padding method 1: zero pad only if length criterion is not met
$length = strlen($message);
$padding = (8 - ($length % 8)) % 8; 
$message .= str_repeat(chr(0), $padding);

// input/initial transformation 1 and iteration
$messageLen = strlen($message);
for ($i = 0; $i < $messageLen; $i = $i + 8) {
    $d = substr($message, $i, 8);
    $i == 0 ? $in = $d : $in = xored($d, $h);
    $h = encrypt($in, $desKey1);
}

// output transformation 3
$innerDecryption = decrypt($h, $desKey2);
$outerEncryption = encrypt($innerDecryption, $desKey1);

// truncation
$mac = substr($outerEncryption, 0, 8);

print(bin2hex($mac) . PHP_EOL); // 37b44913c7a43700
?>

对于使用的测试数据，根据链接的网站，MAC为0x37b44913c7a43700: