hash.java

public static String generateSHA1(String str) {
    String digestStr = null;
    try {
        MessageDigest digest = MessageDigest.getInstance("SHA");
        digest.update(str.getBytes());
        digestStr = new String(Hex.encodeHex(digest.digest()));
    } catch (NoSuchAlgorithmException e) {
        Logger.error("Unknown algorithm.", e);
    }
    return digestStr;
}