Question

我尝试练习C＃编程。我试着计算一个字符串“a”的MD5.has。但如何修复此代码，因为它输出4144e195f46de78a3623da7364d04f11而不是0cc175b9c0f1b6a831c399e269772661？

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string a="a";
            Console.WriteLine(CalculateMD5Hash(a));
            Console.ReadKey();
        }
        public static string CalculateMD5Hash(string input)
        {
            using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create())
            {
                byte[] retval = md5.ComputeHash(Encoding.Unicode.GetBytes(input));
                StringBuilder sb = new StringBuilder();
                for (int i=0;i<retval.Length;++i)
                {
                    sb.Append(retval[i].ToString("x2"));
                }
                return sb.ToString();
            }

        }
    }
}

Answer 1

要获得0cc175b9c0f1b6a831c399e269772661，您只需使用Encoding.UTF8。

using (var md5 = System.Security.Cryptography.MD5.Create())
{
    byte[] hashValue = md5.ComputeHash(Encoding.UTF8.GetBytes(input));
    var sb = new StringBuilder();
    foreach (byte b in hashValue)
        sb.Append(b.ToString("x2"));
    return sb.ToString();
}

请查看.NET使用UTF-16对字符串进行编码的事实。

如何在C＃中计算“a”的MD5哈希值？

1 个答案: