sha1 possible implementation

SHA1.java

      // Sha-1 operations.
    public static String sha1(String input) {
        MessageDigest mdigest;
        String retVal = null;
        try {
            mdigest = MessageDigest.getInstance("SHA1");
            byte[] rawDigest = mdigest.digest(input.getBytes());
            StringBuffer sb = new StringBuffer();

            for (byte b : rawDigest) {
                sb.append(String.format("%02X", b));
            }
            retVal = sb.toString();
        } catch (NoSuchAlgorithmException e) {
            System.err.println("Error occurred in running sha1: "
                    + e.getMessage());
        }
        return retVal;
    }