/// <summary>
/// Builds key exchange request xml with generated keypair's public key and calls key exchange subcontract to receive providers public key
/// </summary>S
/// <param name="fileName"></param>
/// <param name="subContractId">Key exchange subcontractId given by service provider</param>
/// <param name="signingCert">Signing certificate</param>
public void PerformExchange(String fileName, String subContractId, X509Certificate2 signingCert)
{
if (GeneratedPublicKey == null)
{
GenerateKeyPair();
}
var publicKeyXml = GeneratedPublicKey.ToXml();
var signId = GovTalkHelpers.GenerateSignId();
var firstChild = (XmlElement)publicKeyXml.FirstChild;
firstChild.SignXml(signingCert, signId);
var xmlText = GovTalkHelpers.GetXmlFile(fileName);
var requestNode = GovTalkHelpers.ComposeRequestXmlWithParamObjects(xmlText, subContractId, publicKeyXml);
var keyExchangeResponse = GovTalkCallApi.GetResponse(requestNode.OuterXml);
var keyExchangeDoc = new XmlDocument();
keyExchangeDoc.LoadXml(keyExchangeResponse);
//var logFileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "XmlLogs", $"keyExch_{DateTime.Now:yyyy.MM.dd_hh.mm.ss}.xml");
//var fileName = HttpContext.Current.Server.MapPath($"~/XmlLogs/keyExch_{DateTime.Now:yyyy.MM.dd_hh.mm.ss}.xml");
//using (var file = File.CreateText(logFileName))
// keyExchangeDoc.Save(file);
var resultStatus = GovTalkHelpers.GetResponseStatus(keyExchangeDoc);
if (resultStatus.Code != "14")
{
var message = $"KeyExchange error [{resultStatus.Code}] {resultStatus.Message}";
throw new Exception(message);
}
ReceivedPublicKey = new ECPublicKey();
ReceivedPublicKey.LoadXml(keyExchangeResponse);
KeyId = ReceivedPublicKey.Id;
}