C#中的HMAC SHA256与Swift中的HMAC SHA256不匹配

using System;
using System.Security.Cryptography;
using System.Text;

public class Program
{
    public static void Main()
    {
        string message = "Hello World";
        string key = "SecretKey";

        byte[] keyBytes = Encoding.UTF8.GetBytes(key);
        byte[] messageBytes = Encoding.UTF8.GetBytes(message);

        using (HMACSHA256 hmac = new HMACSHA256(keyBytes))
        {
            byte[] hashBytes = hmac.ComputeHash(messageBytes);
            string hash = BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
            Console.WriteLine(hash);
        }
    }
}

import CommonCrypto
import Foundation

func hmacSHA256(message: String, key: String) -> String? {
    guard let messageData = message.data(using: .utf8),
          let keyData = key.data(using: .utf8) else {
        return nil
    }
    
    var hash = [UInt8](repeating: 0, count: Int(CC_SHA256_DIGEST_LENGTH))
    
    keyData.withUnsafeBytes { keyBytes in
        messageData.withUnsafeBytes { messageBytes in
            CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA256),
                   keyBytes.baseAddress, keyBytes.count,
                   messageBytes.baseAddress, messageBytes.count,
                   &hash)
        }
    }
    
    let hashData = Data(bytes: hash, count: Int(CC_SHA256_DIGEST_LENGTH))
    return hashData.map { String(format: "%02hhx", $0) }.joined()
}

let message = "Hello World"
let key = "SecretKey"

if let hash = hmacSHA256(message: message, key: key) {
    print(hash)
}