import java.io.*;
import java.nio.file.*;

import java.util.Scanner;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class SHA256Sum {
    public static void main(String[] args) {
       if (args.length == 0) {
            try {
                printSHA256SystemIn();
            } catch (NoSuchAlgorithmException e) {
                System.err.println("ERROR: cannot find SHA-256 algorithm.");
                return;
            }
        } else {
            for (String filePath : args) {
                try {
                    printSHA256(filePath);
                } catch (NoSuchAlgorithmException e) {
                    System.err.println("ERROR: cannot find SHA-256 algorithm.");
                    return;
                } catch (FileNotFoundException e) {
                    System.err.println("ERROR: " + filePath + ": file not found.");
                    return;
                } catch (IOException e) {
                    System.err.println("ERROR: " + filePath + ": cannot read from file.");
                    return;
                }
            }
        }
    }

    public static void printSHA256(String filePath) throws NoSuchAlgorithmException, IOException {
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update(Files.readAllBytes(Paths.get(filePath)));

        for (byte b : md.digest()) {
            System.out.print(String.format("%02x", b).toUpperCase());
        }

        System.out.println(" *" + filePath);
    }

    public static void printSHA256SystemIn() throws NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        Scanner input = new Scanner(System.in);

        while (input.hasNextLine()) {
            md.update(input.nextLine().getBytes());
        }

        for (byte b : md.digest()) {
            System.out.print(String.format("%02x", b).toUpperCase());
        }

        System.out.println(" *-");
        input.close();
    }
}