private CryptoAlterations PerformEncryptionOrSigning(Stream data, CertInfo certificateInfo, string startingContentType)
{
var content = data.ToBytes();
var returnValue = new CryptoAlterations();
var alteredContentType = startingContentType;
if (certificateInfo.Sign)
{
content = MimeUtils.CreateMessage(alteredContentType, "binary", "", content);
var signResult = MimeUtils.Sign(content, certificateInfo.SendingCertifcatePath, certificateInfo.SendingCertPassword);
content = signResult.Item1;
alteredContentType = signResult.Item2;
returnValue.Headers.Add("EDIINT-Features", "multiple-attachments");
}
if (certificateInfo.Encrypt)
{
if (string.IsNullOrEmpty(certificateInfo.ReceiversCertificatePath))
{
throw new ArgumentNullException(certificateInfo.ReceiversCertificatePath, "if encrytionAlgorithm is specified then recipientCertFilename must be specified");
}
var signedContentTypeHeader = Encoding.ASCII.GetBytes($"Content-Type: {alteredContentType}{Environment.NewLine}");
var contentWithContentTypeHeaderAdded = MimeUtils.ConcatBytes(signedContentTypeHeader, content);
content = EncryptionUtils.Encrypt(contentWithContentTypeHeaderAdded, certificateInfo.ReceiversCertificatePath, EncryptionAlgorithm.DES3);
alteredContentType = "application/pkcs7-mime; smime-type=enveloped-data; name=\"smime.p7m\"";
}
returnValue.ContentType = alteredContentType;
returnValue.Data = new MemoryStream(content);
return(returnValue);
}
public As2Response Send(Stream data, string fromAddress, string toAddress, string fileName,
CertInfo certificateInfo = null, string specifiedContentType = null)
{
var headers = new Dictionary <string, string>
{
{ "Mime-Version", "1.0" },
{ "AS2-Version", "1.2" },
{ "AS2-From", fromAddress },
{ "AS2-To", toAddress },
{ "Message-Id", "<AS2_" + DateTime.Now.ToString("hhmmssddd") + ">" },
{ "Subject", fileName }
};
var contentType = DeriveContentType(specifiedContentType, fileName);
if (certificateInfo == null)
{
headers.Add("Content-Transfer-Encoding", "binary");
headers.Add("Content-Disposition", "inline; filename=\"" + fileName + "\"");
}
else
{
var cryptoAlterations = PerformEncryptionOrSigning(data, certificateInfo, contentType);
foreach (var header in cryptoAlterations.Headers)
{
headers.Add(header.Key, header.Value);
}
data = cryptoAlterations.Data;
contentType = cryptoAlterations.ContentType;
}
var content = new StreamContent(data);
content.Headers.ContentType = MediaTypeHeaderValue.Parse(contentType);
foreach (var header in headers)
{
content.Headers.Add(header.Key, header.Value);
}
var as2Response = new As2Response();
var task = _httpClient.PostAsync(_serverUrl, content)
.ContinueWith(taskWithResponse =>
{
var respMsg = taskWithResponse.Result;
as2Response.Content = respMsg.Content.ReadAsStringAsync().Result;
var encType = respMsg.Content.Headers.ContentEncoding?.FirstOrDefault();
as2Response.EncodingType = GetResponseEncoding(encType);
as2Response.RawHttpResponseMessage = respMsg;
});
task.Wait();
return(as2Response);
}