C#与Java的MD5简单验证(实例代码)

c#端

using system;
using system.io;
using system.security.cryptography;

namespace 计算文件的md5值
{
  class md5_helper
  {
    /// <summary>
    /// 文件md5校验
    /// </summary>
    /// <param name="pathname">文件绝对路径</param>
    /// <returns>md5校验码</returns>
    public string getmd5hash(string pathname)
    {
      string strresult = "";
      string strhashdata = "";
      byte[] arrbythashvalue;
      filestream ofilestream = null;
      md5cryptoserviceprovider omd5hasher =
            new md5cryptoserviceprovider();
      try
      {
        ofilestream = new filestream(pathname, filemode.open, fileaccess.read, fileshare.readwrite);
        arrbythashvalue = omd5hasher.computehash(ofilestream);//计算指定stream 对象的哈希值
        ofilestream.close();
        //由以连字符分隔的十六进制对构成的string，其中每一对表示value 中对应的元素；例如“f-2c-4a”
        strhashdata = bitconverter.tostring(arrbythashvalue);
        //替换-
        strhashdata = strhashdata.replace("-", "");
        strresult = strhashdata;
      }
      catch (system.exception ex)
      {

      }
      return strresult;

    }

    /// <summary>
    /// 字节数组校验
    /// </summary>
    /// <param name="buffer">待字节数组</param>
    /// <returns>md5校验码</returns>
    public string getmd5hash(byte[] buffer)
    {
      string strresult = "";
      string strhashdata = "";
      byte[] arrbythashvalue;
      md5cryptoserviceprovider omd5hasher =
            new md5cryptoserviceprovider();
      try
      {
        arrbythashvalue = omd5hasher.computehash(buffer);//计算指定stream 对象的哈希值
        //由以连字符分隔的十六进制对构成的string，其中每一对表示value 中对应的元素；例如“f-2c-4a”
        strhashdata = bitconverter.tostring(arrbythashvalue);
        //替换-
        strhashdata = strhashdata.replace("-", "");
        strresult = strhashdata;
      }
      catch(system.exception ex)
      {

      }
      return strresult;

    }
  }
}

java端

package com;
import java.io.file;
import java.io.fileinputstream;
import java.io.ioexception;
import java.io.inputstream;
import java.security.messagedigest;
import java.security.nosuchalgorithmexception;

public class md5util {
	/**
	 * 默认的密码字符串组合，用来将字节转换成 16 进制表示的字符,apache校验下载的文件的正确性用的就是默认的这个组合
	 */
	protected static char hexdigits[] = { '0', '1', '2', '3', '4', '5', '6','7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
	protected static messagedigest messagedigest = null;
	static {
		try {
			messagedigest = messagedigest.getinstance("md5");
		} catch (nosuchalgorithmexception e) {
			e.printstacktrace();
		}
	}

	public static void main(string[] args) throws ioexception {

		byte[] buffer= "helloworld".getbytes();//字节数组校验
		string md55 = getfilemd5string(buffer);
		system.out.println("md55:" + md55);
	}
	

	public static string getfilemd5string(file file) throws ioexception {
		inputstream fis;
		fis = new fileinputstream(file);
		byte[] buffer = new byte[1024];
		int numread = 0;
		while ((numread = fis.read(buffer)) > 0) {
			messagedigest.update(buffer, 0, numread);
		}
		fis.close();
		return buffertohex(messagedigest.digest());
	}
	
	public static string getfilemd5string(byte[] buffer) throws ioexception {
			messagedigest.update(buffer, 0, buffer.length);
		return buffertohex(messagedigest.digest());
	}

	private static string buffertohex(byte bytes[]) {
		return buffertohex(bytes, 0, bytes.length);
	}

	private static string buffertohex(byte bytes[], int m, int n) {
		stringbuffer stringbuffer = new stringbuffer(2 * n);
		int k = m + n;
		for (int l = m; l < k; l++) {
			appendhexpair(bytes[l], stringbuffer);
		}
		return stringbuffer.tostring();
	}

	private static void appendhexpair(byte bt, stringbuffer stringbuffer) {
		char c0 = hexdigits[(bt & 0xf0) >> 4];// 取字节中高 4 位的数字转换
		// 为逻辑右移，将符号位一起右移,此处未发现两种符号有何不同
		char c1 = hexdigits[bt & 0xf];// 取字节中低 4 位的数字转换
		stringbuffer.append(c0);
		stringbuffer.append(c1);
	}
} 

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