Avishka Kavindu B. Dambawinna :
I was solving challenges on Hackerrank.com and I met with this challenge about the java SHA-256 Cryptographic hash functions. here
I wrote the following piece of code as a solution. But some test cases are failing for my solution. Hoping to know what's wrong with my code.
import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.nio.charset.StandardCharsets;
import java.math.BigInteger;
public class Solution {
public static String toHexString(byte[] hash)
{
BigInteger number = new BigInteger(1, hash);
StringBuilder hexString = new StringBuilder(number.toString(16));
while (hexString.length() < 32)
{
hexString.insert(0, '0');
}
return hexString.toString();
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String input = sc.next();
try
{
MessageDigest md = MessageDigest.getInstance("SHA-256");
System.out.println(toHexString(md.digest(input.getBytes(StandardCharsets.UTF_8))));
}
// For specifying wrong message digest algorithms
catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
}
}
This is one test case that is failing.
pero_hero :
a 32 byte hash means a string of 64 characters as for any byte you need 2 characters:
while (hexString.length() < 64)
{
hexString.insert(0, '0');
}
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