private bool VerifySignature(JObject data)
{
var isValid = false;
if (data.ContainsKey("payload") &&
data.ContainsKey("signature"))
{
var payloadJson = (string)data["payload"];
var parsedPayload = JObject.Parse(payloadJson);
var signature = (string)data["signature"];
if (parsedPayload.ContainsKey("method") &&
(string)parsedPayload["method"] == "connect" &&
parsedPayload.ContainsKey("pubkey") &&
parsedPayload.ContainsKey("session_id"))
{
ServerPublicKey = (string)parsedPayload["pubkey"];
SessionId = (string)parsedPayload["session_id"];
}
isValid = RSAKeyUtilities.VerifyData(payloadJson, HASHING_ALGORITHM, signature, ServerPublicKey);
}
return(isValid);
}
public Client(string host, int port, string version = VERSION)
{
Version = version;
Endpoint = string.Format("https://{0}:{1}/v{2}/dicom", host, port, version);
using (var rsaProvider = new RSACryptoServiceProvider(1024))
{
try
{
PrivateKey = RSAKeyUtilities.ExportPrivateKey(rsaProvider);
PublicKey = RSAKeyUtilities.ExportPublicKey(rsaProvider);
}
finally
{
rsaProvider.PersistKeyInCsp = false;
}
}
var httpClientHandler = new HttpClientHandler();
httpClientHandler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return(true); };
WebClient = new HttpClient(httpClientHandler);
WebClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
}
private async Task <string> Execute(Dictionary <string, object> parameters)
{
if (!string.IsNullOrWhiteSpace(SessionId))
{
parameters["session_id"] = SessionId;
}
var payload = JsonConvert.SerializeObject(parameters);
var pemSignature = RSAKeyUtilities.ExportSignature(RSAKeyUtilities.SignData(payload, PrivateKey));
var request = new Dictionary <string, object>()
{
{ "dicom", Version },
{ "payload", payload },
{ "signature", pemSignature },
{ "pubkey", PublicKey }
};
var data = JsonConvert.SerializeObject(request);
var content = new StringContent(data, Encoding.UTF8, "application/json");
var postResult = await WebClient.PostAsync(Endpoint, content);
var result = string.Empty;
var resultJson = await postResult.Content.ReadAsStringAsync();
JObject parsedJson = JObject.Parse(resultJson);
if (parsedJson.ContainsKey("payload"))
{
var resultPayload = (string)parsedJson["payload"];
VerifySignature(parsedJson);
result = resultPayload;
}
else if (parsedJson.ContainsKey("error"))
{
result = string.Format("SSS responded with an error: {0}", (string)parsedJson["error"]);
}
else
{
result = string.Format("SSS returned an unexpected response: {0}", postResult.ToString());
}
return(result);
}
