GenerateHash.java

import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;


class GenerateHash {
	public static byte[] getSHA(String input) throws NoSuchAlgorithmException
	{
		MessageDigest md = MessageDigest.getInstance("SHA-256");

		return md.digest(input.getBytes(StandardCharsets.UTF_8));
	}
	
	public static String toHexString(byte[] hash)
	{
		// Convert byte array into signum representation
		BigInteger number = new BigInteger(1, hash);

		// Convert message digest into hex value
		StringBuilder hexString = new StringBuilder(number.toString(16));

		// Pad with leading zeros
		while (hexString.length() < 64)
		{
			hexString.insert(0, '0');
		}

		return hexString.toString();
	}

    public String getDigest(String message){
        try{
            return toHexString(getSHA(message));
        } catch(NoSuchAlgorithmException ne){
            return "None";
        }
        
    }

}