code: public static boolean isHashed(String encoded_string) {
          String algorithm = getCryptoAlgorithm(encoded_string);
          return isValidAlgorithm(algorithm, PasswordCipherUtil.getSupportedHashAlgorithms());
      }
docs: Determine if the provided string is hashed by examining the algorithm tag.
  Note that this method is only avaiable for the Liberty profile.
  
  @param encoded_string the string with the encoded algorithm tag.
  @return true if the encoded algorithm is hash. false otherwise.