esp_tmp_iv
iv = esp_tmp_iv(aead, tmp, extralen);
iv = esp_tmp_iv(aead, tmp, extralen);
iv = esp_tmp_iv(aead, tmp, seqhilen);
iv = esp_tmp_iv(aead, tmp, extralen);
iv = esp_tmp_iv(aead, tmp, extralen);
iv = esp_tmp_iv(aead, tmp, seqhilen);