Gerar hash arquivo

gistfile1.txt

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

public class Main {

	 public static void main(String[] args)throws Exception
	    {
	        MessageDigest md = MessageDigest.getInstance("SHA-512");
	        FileInputStream fis = new FileInputStream("/home/rafael/Downloads/ACcompactado.zip");

	        byte[] dataBytes = new byte[1024];

	        int nread = 0;
	        while ((nread = fis.read(dataBytes)) != -1) {
	          md.update(dataBytes, 0, nread);
	        };
	        byte[] mdbytes = md.digest();

	        //convert the byte to hex format method 1
	        StringBuffer sb = new StringBuffer();
	        for (int i = 0; i < mdbytes.length; i++) {
	          sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
	        }

	        System.out.println("Digest(in hex format):: " + sb.toString());

	        //convert the byte to hex format method 2
	        StringBuffer hexString = new StringBuffer();
	    	for (int i=0;i<mdbytes.length;i++) {
	    		String hex=Integer.toHexString(0xff & mdbytes[i]);
	   	     	if(hex.length()==1) hexString.append('0');
	   	     	hexString.append(hex);
	    	}
	    	System.out.println("Digest(in hex format):: " + hexString.toString());
	    }
	
}