Obtain the same output in java as the linux md5sum command

I'd like to get the same hash value in java as the md5sum/opensl command.
I can't get the result I expected.
How do I write in java to get the same result?

(1) For the md5sum/opensl command

$echoabc|md5sum
0bee89b07a248e27c83fc3d5951213c1-
$ echoabc | openssl md5
(stdin) = 0bee89b07a248e27c83fc3d5951213c1
$

(2) For java programs (Apache Common Codec, MessageDigest)
·Source

package test;

import java.math.BigInteger;
import java.security.MessageDigest;
import org.apache.commons.codec.digest.DigestUtils;

public class Md5sum2 {

    public static void main(String[]args) {
        String str = "abc";

        // 1. MessageDiget
        try{
            byte [ ] input = str.getBytes("UTF-8");
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] md5 = md.digest(input);
            BigInteger bigInt = new BigInteger(1,md5);
            String result = bigInt.toString(16);
            System.out.println("result:"+result);
        } catch(Exceptionex){
            ex.printStackTrace();
            through new RuntimeException (ex);
        }

        // 2. Apache Commons Codec
        String out = DigestUtils.md5Hex(str);
        System.out.println("result:"+out);
    }
}

·Results of execution

$java-cp to /.m2/repository/commons-codec/commons-codec/1.10/commons-codec-1.10.jar:.test.Md5sum2
result —900150983cd24fb0d6963f7d28e17f72
result —900150983cd24fb0d6963f7d28e17f72
$

java md5 md5sum

2022-09-30 20:47

1 Answers

echo automatically adds a new line when there is no new line at the end of the string.
So echoabc|md5sum is actually calculating the MD5 hash of "abc\n".

In Java,

String str="abc\n";

You can get the same results as echoabc|md5sum.

Conversely, if you want echoabc|md5sum to get the same result as Java, you can add the echo option to echo to calculate the MD5 hash of the "abc" itself because no new line is added.

$echo-nabc | md5sum
900150983cd24fb0d6963f7d28e17f72-

2022-09-30 20:47

If you have any answers or tips

Popular Tags

python x 4647

android x 1593

java x 1494

javascript x 1427

c x 927

c++ x 878

ruby-on-rails x 696

php x 692

python3 x 685

html x 656