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

namespace MasstransferCommon.Utils;

/// <summary>
///     MD5 加密工具类
/// </summary>
public class Md5Util
{
    public static string Md5(string input)
    {
        // 创建一个MD5对象
        // 将输入字符串转换为字节数组
        var inputBytes = Encoding.UTF8.GetBytes(input);
        // 计算输入字节数组的哈希值
        var bytes = MD5.HashData(inputBytes);
        // 将字节数组转换为字符串
        var hashString = new StringBuilder();
        foreach (var b in bytes) hashString.Append($"{b:x2}");

        return hashString.ToString();
    }
    
    /// <summary>
    /// 计算压缩包md5
    /// </summary>
    /// <param name="filePath"></param>
    /// <returns></returns>
    public static string Md5ForZipFile(string filePath)
    {
        using (var md5 = MD5.Create())
        {
            using (var stream = File.OpenRead(filePath))
            {
                // 计算文件流的哈希值
                var hash = md5.ComputeHash(stream);
                // 将哈希值转换为字符串格式
                var hashString = BitConverter.ToString(hash).Replace("-", string.Empty).ToLowerInvariant();
                return hashString;
            }
        }
    }
}