一个java的md5加密代码， 高手帮忙看看， 要弄成c++的

[daviddelphilee]

不太懂java， 这个是别人写的， 对错也不知道， 对比了下c++里的md5算法， 我感觉是错的，
java高手帮忙看下， 是否正确， 是什么意思。





package util.xxx;

import java.io.FileInputStream;
import java.io.InputStream;
import java.security.MessageDigest;

public class HashFile {
public static char[] hexChar = {'0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'a', 'b',
'c', 'd', 'e', 'f'};


public static String getHash(String fileName, String hashType) throws
Exception {
InputStream fis;
fis = new FileInputStream(fileName);
byte[] buffer = new byte[1024];
MessageDigest md5 = MessageDigest.getInstance(hashType);
int numRead = 0;
while ((numRead = fis.read(buffer)) > 0) {
md5.update(buffer, 0, numRead);
}
fis.close();
return toHexString(md5.digest());
}

public static String toHexString(byte[] b) {
StringBuilder sb = new StringBuilder(b.length * 2);
for (int i = 0; i < b.length; i++) {
sb.append(hexChar[(b[i] & 0xf0) >>> 4]);
sb.append(hexChar[b[i] & 0x0f]);
}
return sb.toString();
}
public static void main(String[] args) throws
Exception {
String fileName = "F:\\onecard[1].ear.rar";
String hashType = "MD5";
System.out.println(hashType + " == " +
getHash(fileName, hashType));
}
}

[lhmei]

那你直接用一个c版的md5不就可以了吗?

[gujianjun2006]

import java.security.*;
import java.security.spec.*; 
public class MD5_Test{
		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[] strTemp = s.getBytes();
			MessageDigest mdTemp = MessageDigest.getInstance("MD5");
			mdTemp.update(strTemp);
			byte[] md = mdTemp.digest();
			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){
			return null;
		}
	      }
         	public static void main(String[] args){
			//MD5_Test aa = new MD5_Test();
			System.out.print("MD5:"+MD5_Test.MD5("gujianjun"));//这里可以换成你要加密的文本
		}
}