import java.security.*;

public class sha1demo {
  public static void main(String[] args) throws NoSuchAlgorithmException {
    MessageDigest md = MessageDigest.getInstance("SHA");
    String data = "It's just data";

    md.update(data.getBytes());
    byte[] digest = md.digest();
    for (int i=0; i<digest.length; i++) {
      String hex = Integer.toHexString(digest[i]);
      if (hex.length() == 1) hex = "0" + hex;
      hex=hex.substring(hex.length()-2);
      System.out.print(hex);
    }
  }
}