code: public static TokenProvider createSharedAccessSignatureTokenProvider(String sasKeyName, String sasKey)
      {
          return new SharedAccessSignatureTokenProvider(sasKeyName, sasKey, SecurityConstants.DEFAULT_SAS_TOKEN_VALIDITY_IN_SECONDS);
      }
docs: Creates a Shared Access Signature token provider with the given key name and key value. Returned token provider creates tokens
  with validity of 20 minutes. This is a utility method.
  @param sasKeyName SAS key name
  @param sasKey SAS key value
  @return an instance of Shared Access Signature token provider with the given key name, key value.