import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

class Program01 {
	public static String digest(String clearText) {
		String digestText = null;
		try {
			digestText = tryDigest(clearText);
		}catch(NoSuchAlgorithmException ex) {
			System.err.println("Nincs ilyen algoritmus");
		}
		return digestText;
	}
	public static String tryDigest(String clearText) 
		throws NoSuchAlgorithmException {
			
		MessageDigest md = MessageDigest.getInstance("SHA1");
		byte[] sb = md.digest(clearText.getBytes());

		StringBuffer hexText = new StringBuffer();
		for (int i=0; i<sb.length; i++) {
			String hex = Integer.toHexString(0xFF & sb[i]);
			if(hex.length() == 1) {
				hexText.append('0');
			}
			hexText.append(hex);
		}		
		return hexText.toString();
	}
	public static void main(String[] args) {		
		System.out.println(digest("titok"));
	}
}