C# HMACSHA256 给出的结果与 PHP hash_hmac 不同

Question

我在 php 中有以下代码： demo

function generateHash($hashSecret,$postData) {

    ksort($postData);

        $message="";

        $appendAmp=0;

    foreach($postData as $key => $value) {

            if (strlen($value) > 0) {

                if ($appendAmp == 0) {

                    $message .= $key . '=' . $value;

                    $appendAmp = 1;

                } else {

                    $message .= '&' . $key . "=" . $value;

                }

            }

        }

    $secret = pack('H*', $hashSecret);

    return hash_hmac('sha256', $message, $secret);

}

$postData = array(

    "cardNum" =>  "5123456789012346",

    "cardExp" =>  2105,

    "cardCVC" =>  123,

    "holderName" => "John Doe",

    "mobileNumber" => "20100000000000"

);

$secureHash= 'C0DF9A7B3819968807A9D4E48D0E65C6';

$hashSecret = generateHash($secureHash,$postData);

echo $hashSecret;

//输出6975f8f502e5972722a6d8760cc558e7867f36a312a5d336c4ba983dcfb81691 //以及以下c#演示

public static void Main()

{

    Console.Write(CreateToken("cardCVC=123&cardExp=2105&cardNum=5123456789012346&holderName=John Doe&mobileNumber=20100000000000","C0DF9A7B3819968807A9D4E48D0E65C6"));

}

 private static string CreateToken(string message, string secret)

{

  var encoding = new System.Text.UTF8Encoding();

  byte[] keyByte = encoding.GetBytes(secret);

  byte[] messageBytes = encoding.GetBytes(message);

  using (var hmacsha256 = new HMACSHA256(keyByte))

  {

    byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);

    return BitConverter.ToString(hashmessage).Replace("-","");

  }

}

//输出：26FFE2E29513304F96D444CB69210657B4E44E837B7C8E8947C667B344594F18演示我需要修改我的c#代码以匹配从php生成的值

更新：我尝试过在线 sha 生成器，它给出了我的 C# 结果

Answer 1

经过多次试验，我发现 PHP pack('H*', $hashSecret) 导致结果不同，所以我添加了以下方法：public static byte[] Pack(string key){&nbsp; &nbsp; key = key.Replace("-", "");&nbsp; &nbsp; byte[] raw = new byte[key.Length / 2];&nbsp; &nbsp; for (int i = 0; i < raw.Length; i++)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; raw[i] = Convert.ToByte(key.Substring(i * 2, 2), 16);&nbsp; &nbsp; }&nbsp; &nbsp; return raw;}