protected void SubmitSignatureButton_Click(object sender, EventArgs e)
{
PKCertificate cert;
byte[] signatureContent;
try {
// Decode the user's certificate.
cert = PKCertificate.Decode(Convert.FromBase64String(CertificateField.Value));
// Instantiate a CadesSigner class.
var cadesSigner = new CadesSigner();
// Set the document to be signed and the policy, exactly like in the previous action
// (SubmitCertificateButton_Click).
cadesSigner.SetDataToSign(Storage.GetSampleDocContent());
cadesSigner.SetPolicy(getSignaturePolicy());
// Set the signer certificate.
cadesSigner.SetSigningCertificate(cert);
// Set the signature computed on the client-side, along with the "to-sign-bytes" recovered from
// the page.
cadesSigner.SetPrecomputedSignature(Convert.FromBase64String(SignatureField.Value), Convert.FromBase64String(ToSignBytesField.Value));
// Call ComputeSignature(), which does all the work, including validation of the signer's
// certificate and of the resulting signature.
cadesSigner.ComputeSignature();
// Get the signature as an array of bytes.
signatureContent = cadesSigner.GetSignature();
}
catch (ValidationException ex) {
// Some of the operations above may throw a ValidationException, for instance if the certificate
// is revoked.
ex.ValidationResults.Errors.ForEach(ve => ModelState.AddModelError("", ve.ToString()));
CertificateField.Value = "";
ToSignHashField.Value = "";
return;
}
// Pass the following fields to be used on CadesSignatureInfo page:
// - The signature file will be stored on the folder "App_Data/". Its name will be passed by
// SignatureFile field.
// - The user's certificate
this.SignatureFile = Storage.StoreFile(signatureContent, ".p7s");
this.Certificate = cert;
Server.Transfer("CadesSignatureInfo.aspx");
}
public IHttpActionResult Complete(SignatureCompleteRequest request)
{
byte[] signatureContent;
try {
// Instantiate a CadesSigner class
var cadesSigner = new CadesSigner();
// Set the document to be signed and the policy, exactly like in the Start action
if (!string.IsNullOrEmpty(request.FileId))
{
cadesSigner.SetDataToSign(Storage.GetFile(request.FileId));
}
else
{
cadesSigner.SetDataToSign(Storage.GetSampleDocContent());
}
cadesSigner.SetPolicy(getSignaturePolicy());
// Set signer's certificate
cadesSigner.SetSigningCertificate(PKCertificate.Decode(request.Certificate));
// Set the signature computed on the client-side, along with the "to-sign-bytes" received from the request.
cadesSigner.SetPrecomputedSignature(request.Signature, request.ToSignBytes);
// Call ComputeSignature(), which does all the work, including validation of the signer's certificate and of the resulting signature.
cadesSigner.ComputeSignature();
// Get the signature as an array of bytes
signatureContent = cadesSigner.GetSignature();
} catch (ValidationException ex) {
// Some of the operations above may throw a ValidationException, for instance if the certificate is revoked.
return(new ResponseMessageResult(Request.CreateResponse(HttpStatusCode.BadRequest, new ValidationErrorModel(ex.ValidationResults))));
}
// Pass the following fields to be used on signature-results template:
// - The signature file will be stored on the folder "App_Data/". Its name will be passed by Filename field.
// - The user's certificate
var response = new SignatureCompleteResponse()
{
Filename = Storage.StoreFile(signatureContent, ".p7s"),
Certificate = new CertificateModel(PKCertificate.Decode(request.Certificate))
};
return(Ok(response));
}
public ActionResult Complete(SignatureCompleteModel model)
{
byte[] signatureContent;
try {
// Instantiate a CadesSigner class
var cadesSigner = new CadesSigner();
// Set the document to be signed and the policy, exactly like in the Start method
cadesSigner.SetDataToSign(Storage.GetSampleDocContent());
cadesSigner.SetPolicy(getSignaturePolicy());
// Set signer's certificate
cadesSigner.SetSigningCertificate(PKCertificate.Decode(model.CertContent));
// Set the signature computed on the client-side, along with the "to-sign-bytes" (rendered in a hidden input field, see the view)
cadesSigner.SetPrecomputedSignature(model.Signature, model.ToSignBytes);
// Call ComputeSignature(), which does all the work, including validation of the signer's certificate and of the resulting signature
cadesSigner.ComputeSignature();
// Get the signature as an array of bytes
signatureContent = cadesSigner.GetSignature();
} catch (ValidationException ex) {
// Some of the operations above may throw a ValidationException, for instance if the certificate is revoked.
ModelState.AddModelError("", ex.ValidationResults.ToString());
return(View());
}
// On the next step (SignatureInfo action), we'll render the following information:]
// - The filename to be available to download in next action.
// - The signer's certificate information to be rendered.
// We'll store these values on TempData, which is a dictionary shared between actions.
TempData["SignatureInfoModel"] = new SignatureInfoModel()
{
// Store the signature file on the folder "App_Data/" and redirects to the SignatureInfo action with the filename.
// With this filename, it can show a link to download the signature file.
Filename = Storage.StoreFile(signatureContent, ".p7s"),
UserCert = PKCertificate.Decode(model.CertContent)
};
return(RedirectToAction("SignatureInfo"));
}
public ActionResult Complete(SignatureCompleteModel model)
{
byte[] signatureContent;
try {
// Instantiate a CadesSigner class
var cadesSigner = new CadesSigner();
// Set the document to be signed, exactly like in the Start method
if (!string.IsNullOrEmpty(model.CmsFile))
{
// Verify if the cmsfile exists and get the content of the cmsfile.
byte[] cmsfileContent;
if (!StorageMock.TryGetFile(model.CmsFile, out cmsfileContent))
{
return(HttpNotFound());
}
// If the URL argument "cmsfile" is filled, the user has asked to co-sign a previously signed
// CMS. We'll set the path to the CMS to be co-signed, which was perviously saved in the
// App_Data folder by the POST action on this controller.
cadesSigner.SetSignatureToCoSign(cmsfileContent);
}
else
{
// Verify if the userfile exists and get the content of the userfile.
byte[] userfileContent;
if (!StorageMock.TryGetFile(model.UserFile, out userfileContent))
{
return(HttpNotFound());
}
// If the URL argument "userfile" is filled, it means the user was redirected here by
// UploadController (signature with file uploaded by user). We'll set the path of the file to
// be signed, which was saved in the App_Data folder by UploadController.
cadesSigner.SetDataToSign(userfileContent);
}
// Set the signature policy, exactly like in the Start method.
cadesSigner.SetPolicy(getSignaturePolicy());
// Decode the user's certificate and set as the signer certificate.
var cert = PKCertificate.Decode(model.CertContent);
cadesSigner.SetSigningCertificate(cert);
// Set the signature computed on the client-side, along with the "to-sign-bytes" (rendered in a hidden input field, see the view)
cadesSigner.SetPrecomputedSignature(model.Signature, model.ToSignBytes);
// Call ComputeSignature(), which does all the work, including validation of the signer's certificate and of the resulting signature
cadesSigner.ComputeSignature();
// Get the signature as an array of bytes
signatureContent = cadesSigner.GetSignature();
} catch (ValidationException ex) {
// Some of the operations above may throw a ValidationException, for instance if the certificate is revoked.
ModelState.AddModelError("", ex.ValidationResults.ToString());
// Return userfile to continue the signature with the same file.
return(View("Complete", model));
}
// On the next step (SignatureInfo action), we'll render the following information:]
// - The filename to be available to download in next action.
// We'll store these values on TempData, which is a dictionary shared between actions.
TempData["SignatureInfoModel"] = new SignatureInfoModel()
{
// Store the signature file on the folder "App_Data/" and redirects to the SignatureInfo action with the filename.
// With this filename, it can show a link to download the signature file.
File = StorageMock.Store(signatureContent, ".p7s")
};
return(RedirectToAction("SignatureInfo"));
}
public IHttpActionResult Complete(SignatureCompleteRequest model)
{
// We'll use the SignatureProcess ID to locate the values we stored during the signature first step
SignatureProcess signatureProcess;
using (var dbContext = new DbContext()) {
signatureProcess = dbContext.SignatureProcesses.FirstOrDefault(p => p.Id == model.ProcessId);
// We won't be needing this information again, so let's do some housekeeping
if (signatureProcess != null) {
dbContext.SignatureProcesses.Remove(signatureProcess);
dbContext.SaveChanges();
}
}
// If we haven't found the SignatureProcess, something went wrong and we cannot continue (this shouldn't normally happen)
if (signatureProcess == null) {
return NotFound();
}
byte[] signatureContent;
try {
var cadesSigner = new CadesSigner();
// Set the document to be signed and the policy, exactly like in the Start method
cadesSigner.SetDataToSign(Util.GetSampleDocContent());
cadesSigner.SetPolicy(getPolicy());
// Set signer's certificate recovered from the database
cadesSigner.SetSigningCertificate(PKCertificate.Decode(signatureProcess.CadesSignerCertificate));
// Set the signature computed on the client-side, along with the "to-sign-bytes" recovered from the database
cadesSigner.SetPrecomputedSignature(model.Signature, signatureProcess.CadesToSign);
// Call ComputeSignature(), which does all the work, including validation of the signer's certificate and of the resulting signature
cadesSigner.ComputeSignature();
// Get the signature as an array of bytes
signatureContent = cadesSigner.GetSignature();
} catch (ValidationException ex) {
// Some of the operations above may throw a ValidationException, for instance if the certificate is revoked.
return Ok(new SignatureCompleteResponse() {
Success = false,
Message = "A validation error has occurred",
ValidationResults = ex.ValidationResults.ToString()
});
}
// Store the signature for future download (see method SignatureController.Download in the Controllers folder)
Signature signature;
using (var dbContext = new DbContext()) {
signature = Signature.Create();
signature.Type = SignatureTypes.Cades;
signature.Content = signatureContent;
dbContext.Signatures.Add(signature);
dbContext.SaveChanges();
}
// Inform the page of the success, along with the ID of the stored signature, so that the page
// can render the download link
return Ok(new SignatureCompleteResponse() {
Success = true,
SignatureId = signature.Id
});
}
private void completeSignature()
{
// Get the ID of the document currently being signed.
var docId = DocumentIds[DocumentIndex];
PKCertificate cert;
byte[] signatureContent;
try {
// Decode the user's certificate.
cert = PKCertificate.Decode(Convert.FromBase64String(CertificateField.Value));
// Instantiate a CadesSigner class.
var cadesSigner = new CadesSigner();
// Set the document to be signed and the policy, exactly like in the previous action
// (SubmitCertificateButton_Click).
cadesSigner.SetDataToSign(Storage.GetBatchDocContent(docId));
cadesSigner.SetPolicy(getSignaturePolicy());
// Set the signer certificate.
cadesSigner.SetSigningCertificate(cert);
// Optionally, set whether the content should be encapsulated in the resulting CMS.
cadesSigner.SetEncapsulatedContent(false);
// Set the signature computed on the client-side, along with the "to-sign-bytes" recovered from
// the page.
cadesSigner.SetPrecomputedSignature(Convert.FromBase64String(SignatureField.Value), Convert.FromBase64String(ToSignBytesField.Value));
// Call ComputeSignature(), which does all the work, including validation of the signer's
// certificate and of the resulting signature.
cadesSigner.ComputeSignature();
// Get the signature as an array of bytes.
signatureContent = cadesSigner.GetSignature();
}
catch (ValidationException ex) {
// One or more validations failed. We log the error and update the page with a summary of what
// happened to this document.
logger.Error(ex, "Validation error completing the signature of a batch document");
setValidationError(ex.ValidationResults);
return;
}
catch (Exception ex) {
// An error has occurred. We log the error and update the page with a summary of what happened to
// this document.
logger.Error(ex, "Error completing the signature of a batch document");
setError(ex.Message);
return;
}
// Store the signed file.
var file = Storage.StoreFile(signatureContent, ".p7s");
// Update the page with a link to the signed file.
var docItem = DocumentsListView.Items[DocumentIndex];
docItem.DataItem = new DocumentItem()
{
Id = DocumentIds[DocumentIndex],
DownloadLink = "Download?file=" + file
};
docItem.DataBind();
}