分别用C#和Java实现MD5加密

两种方法返回的结果是一样的

Java版：

import java.security.MessageDigest;

/**
 * Created by liuyikai on 2016/8/8.
 */
public class MD5Util {
    public final static String MD5(String s) {
        char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
        try {
            byte[] btInput = s.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

}

C#版：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace PasswordGenerator
{
    class MD5Util
    {
        public static String MD5(string s)
        {
            char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(s);
            byte[] result = md5.ComputeHash(inputBytes);
            int j = result.Length;
            char[] str = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++)
            {
                byte byte0 = result[i];
                str[k++] = hexDigits[byte0 >> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);


        }
    }
}