在C#中实现与Java MessageDigest MD5等效的哈希算法

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5Java {
    public static String calculateMd5(String input) throws NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.reset();
        md.update(input.getBytes());
        byte[] enc = md.digest();

        StringBuilder hex = new StringBuilder();
        for (int i = 0; i < enc.length; i++) {
            // 将每个字节转换为无符号整数，然后转为十六进制字符串
            String h = Integer.toHexString(0xFF & enc[i]);
            // 确保每个十六进制数字都是两位，不足两位前补零
            hex.append((h.length() == 2) ? h : ("0" + h));
        }
        return hex.toString();
    }

    public static void main(String[] args) throws NoSuchAlgorithmException {
        String password = "HELLOWORLD";
        System.out.println("Java MD5 for 'HELLOWORLD': " + calculateMd5(password));
        // 预期输出: e81e26d88d62aba9ab55b632f25f117d
    }
}

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

public class Md5CSharp
{
    public static string CalculateMd5(string input)
    {
        // 1. 将输入字符串转换为字节数组，通常使用UTF8编码以确保跨平台一致性
        byte[] inputBytes = Encoding.UTF8.GetBytes(input);

        // 2. 创建MD5哈希算法实例
        using (MD5 md5 = MD5.Create())
        {
            // 3. 计算哈希值
            byte[] hashBytes = md5.ComputeHash(inputBytes);

            // 4. 将字节数组转换为十六进制字符串
            StringBuilder hex = new StringBuilder();
            foreach (byte b in hashBytes)
            {
                // 使用"{0:x2}"格式化字符串，将每个字节转换为两位小写十六进制数
                hex.AppendFormat("{0:x2}", b);
            }
            return hex.ToString();
        }
    }

    public static void Main(string[] args)
    {
        string userPassword = "HELLOWORLD";
        string md5Hash = CalculateMd5(userPassword);
        Console.WriteLine($"C# MD5 for '{userPassword}': {md5Hash}");
        // 预期输出: e81e26d88d62aba9ab55b632f25f117d
    }
}