Java中的HMAC-SHA256 /从C#转换而来

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

public class HmacSha256Example {
    public static void main(String[] args) {
        String message = "Hello, World!";
        String key = "secretKey";

        try {
            Mac sha256Hmac = Mac.getInstance("HmacSHA256");
            SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "HmacSHA256");
            sha256Hmac.init(secretKey);
            byte[] hmacBytes = sha256Hmac.doFinal(message.getBytes());

            // 将字节数组转换为十六进制字符串
            StringBuilder sb = new StringBuilder();
            for (byte b : hmacBytes) {
                sb.append(String.format("%02x", b));
            }
            String hmac = sb.toString();

            System.out.println("HMAC-SHA256: " + hmac);
        } catch (NoSuchAlgorithmException | InvalidKeyException e) {
            e.printStackTrace();
        }
    }
}

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

class HmacSha256Example
{
    static void Main()
    {
        string message = "Hello, World!";
        string key = "secretKey";

        using (HMACSHA256 hmac = new HMACSHA256(Encoding.UTF8.GetBytes(key)))
        {
            byte[] hmacBytes = hmac.ComputeHash(Encoding.UTF8.GetBytes(message));

            // 将字节数组转换为十六进制字符串
            StringBuilder sb = new StringBuilder();
            foreach (byte b in hmacBytes)
            {
                sb.Append(b.ToString("x2"));
            }
            string hmacString = sb.ToString();

            Console.WriteLine("HMAC-SHA256: " + hmacString);
        }
    }
}