How to convert byte array to BigInteger in java

Question

I\'m working on java... I want to know how to convert array of byte into BigInteger. Actually i used md5\'s digest method which returned me array of byte which i want to co

Answer 1

This example Get MD5 hash in a few lines of Java has a related example.

I believe you should be able to do

MessageDigest m=MessageDigest.getInstance("MD5");
m.update(message.getBytes(), 0, message.length());
BigInteger bi = new BigInteger(1,m.digest());

and if you want it printed in the style "d41d8cd98f00b204e9800998ecf8427e" you should be able to do

System.out.println(bi.toString(16));

Answer 2

Actually i used md5's digest method which returned me array of byte which i want to convert into a BigInteger.

You can use new BigInteger(byte[]).

However, it should be noted that the MD5 hash is not really an integer in any useful sense. It is really just a binary bit pattern.

I guess you are just doing this so that you can print or order the MD5 hashes. But there are less memory hungry ways of accomplishing both tasks.