Comparar senhas

public class Teste {

    public static void main(String[] args) throws NoSuchAlgorithmException, IOException {
        // TODO code application logic here
        BufferedReader userInput = new BufferedReader(new InputStreamReader(System.in));

        System.out.println("Enter name:");
        String String = userInput.readLine();
        
        System.out.println("Enter password:");
        String senha = userInput.readLine();

        System.out.println("SHA1 hash of string: " + AeSimpleSHA1.SHA1(senha));
}
}

package br.com.teste;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

class AeSimpleSHA1 {

    //metodo para converter senha
    private static String convertToHex(byte[] data) {
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < data.length; i++) {
            int halfbyte = (data[i] >>> 4) & 0x0F;
            int two_halfs = 0;
            do {
                if ((0 <= halfbyte) && (halfbyte <= 9)) {
                    buf.append((char) ('0' + halfbyte));
                } else {
                    buf.append((char) ('a' + (halfbyte - 10)));
                }
                halfbyte = data[i] & 0x0F;
            } while (two_halfs++ < 1);
        }
        return buf.toString();
    }

    //chamada da função para converter senha
    public static String SHA1(String text)
            throws NoSuchAlgorithmException, UnsupportedEncodingException {
        MessageDigest md;
        md = MessageDigest.getInstance("SHA-1");
        byte[] sha1hash = new byte[40];
        md.update(text.getBytes("iso-8859-1"), 0, text.length());
        sha1hash = md.digest();
        return convertToHex(sha1hash);
    }
}