public ActionResult Index(SignatureStartModel model)
{
byte[] toSignBytes, transferData;
SignatureAlgorithm signatureAlg;
try {
// Verify if the userfile exists and get its absolute path.
string userfilePath;
if (!StorageMock.TryGetFile(model.UserFile, out userfilePath))
{
return(HttpNotFound());
}
// Decode the user's certificate.
var cert = PKCertificate.Decode(model.CertContent);
// Get an instance of the PadesSigner class.
var padesSigner = new PadesSigner();
// Set the file to be signed.
padesSigner.SetPdfToSign(userfilePath);
// Set the signer certificate.
padesSigner.SetSigningCertificate(cert);
// Set the signature policy.
padesSigner.SetPolicy(GetSignaturePolicy());
// Set a visual representation for the signature.
padesSigner.SetVisualRepresentation(PadesVisualElements.GetVisualRepresentationForPkiSdk(cert));
// Generate the "to-sign-bytes". This method also yields the signature algorithm that must
// be used on the client-side, based on the signature policy, as well as the "transfer data",
// a byte-array that will be needed on the next step.
toSignBytes = padesSigner.GetToSignBytes(out signatureAlg, out transferData);
} catch (ValidationException ex) {
// Some of the operations above may throw a ValidationException, for instance if the certificate
// encoding cannot be read or if the certificate is expired.
ModelState.AddModelError("", ex.ValidationResults.ToString());
return(View());
}
// On the next step (Complete action), we'll need once again some information:
// - The thumbprint of the selected certificate.
// - The "transfer data" used to validate the signature in complete action. Its content is stored in
// a temporary file (with extension .bin) to be shared with the Complete action.
// - The "to-sign-hash" (digest of the "to-sign-bytes") to be signed. (see signature-complete-form.js)
// - The OID of the digest algorithm to be used during the signature operation.
// We'll store these values on TempData, which is a dictionary shared between actions.
TempData["SignatureCompleteModel"] = new SignatureCompleteModel()
{
CertThumb = model.CertThumb,
TransferDataFileId = StorageMock.Store(transferData, ".bin"),
ToSignHash = signatureAlg.DigestAlgorithm.ComputeHash(toSignBytes),
DigestAlgorithmOid = signatureAlg.DigestAlgorithm.Oid
};
return(RedirectToAction("Complete", new { userfile = model.UserFile }));
}
public IHttpActionResult Start(SignatureStartRequest request)
{
byte[] toSignBytes, transferData;
SignatureAlgorithm signatureAlg;
try {
// Decode the user's certificate
var cert = PKCertificate.Decode(request.Certificate);
// Instantiate a PadesSigner class
var padesSigner = new PadesSigner();
// Set the PDF to sign, which in the case of this example is a fixed sample document
if (!string.IsNullOrEmpty(request.FileId))
{
padesSigner.SetPdfToSign(Storage.GetFile(request.FileId));
}
else
{
padesSigner.SetPdfToSign(Storage.GetSampleDocContent());
}
// Set the signer certificate
padesSigner.SetSigningCertificate(cert);
// Set the signature policy
padesSigner.SetPolicy(getSignaturePolicy());
// Set the signature's visual representation options (optional)
padesSigner.SetVisualRepresentation(getVisualRepresentation(cert));
// Generate the "to-sign-bytes". This method also yields the signature algorithm that must
// be used on the client-side, based on the signature policy, as well as the "transfer data",
// a byte-array that will be needed on the next step.
toSignBytes = padesSigner.GetToSignBytes(out signatureAlg, out transferData);
} catch (ValidationException ex) {
// Some of the operations above may throw a ValidationException, for instance if the certificate
// encoding cannot be read or if the certificate is expired.
return(new ResponseMessageResult(Request.CreateResponse(HttpStatusCode.BadRequest, new ValidationErrorModel(ex.ValidationResults))));
}
// Create response with some informations that we'll use on Complete action and on client-side.
var response = new SignatureStartResponse()
{
// The "transfer data" for PDF signatures can be as large as the original PDF itself. Therefore, we mustn't use a hidden field
// on the page to store it. Here we're using our storage mock (see file Classes\Storage.cs) to simulate storing the transfer data
// on a database and saving on a hidden field on the page only the ID that can be used later to retrieve it. Another option would
// be to store the transfer data on the Session dictionary.
TransferDataFileId = Storage.StoreFile(transferData),
// Send to the javascript the "to sign hash" of the document (digest of the "to-sign-bytes") and the digest algorithm that must
// be used on the signature algorithm computation
ToSignBytes = toSignBytes,
DigestAlgorithmOid = signatureAlg.DigestAlgorithm.Oid
};
return(Ok(response));
}
protected void SubmitCertificateButton_Click(object sender, EventArgs e)
{
byte[] toSignBytes, transferData;
SignatureAlgorithm signatureAlg;
try {
// Decode the user's certificate.
var cert = PKCertificate.Decode(Convert.FromBase64String(CertificateField.Value));
// Instantiate a PadesSigner class.
var padesSigner = new PadesSigner();
// Set the PDF to sign, which in the case of this example is a fixed sample document.
padesSigner.SetPdfToSign(Storage.GetSampleDocContent());
// Set the signer certificate.
padesSigner.SetSigningCertificate(cert);
// Set the signature policy.
padesSigner.SetPolicy(getSignaturePolicy());
// Set the signature's visual representation options (optional).
padesSigner.SetVisualRepresentation(getVisualRepresentation(cert));
// Generate the "to-sign-bytes". This method also yields the signature algorithm that must
// be used on the client-side, based on the signature policy, as well as the "transfer data",
// a byte-array that will be needed on the next step.
toSignBytes = padesSigner.GetToSignBytes(out signatureAlg, out transferData);
}
catch (ValidationException ex) {
// Some of the operations above may throw a ValidationException, for instance if the certificate
// encoding cannot be read or if the certificate is expired.
ex.ValidationResults.Errors.ForEach(ve => ModelState.AddModelError("", ve.ToString()));
return;
}
// The "transfer data" for PDF signatures can be as large as the original PDF itself. Therefore, we
// mustn't use a hidden field on the page to store it. Here we're using our storage mock
// (see file Classes\Storage.cs) to simulate storing the transfer data on a database and saving on a
// hidden field on the page only the ID that can be used later to retrieve it. Another option would
// be to store the transfer data on the Session dictionary.
TransferDataFileIdField.Value = Storage.StoreFile(transferData);
// Send to the javascript the "to sign hash" of the document (digest of the "to-sign-bytes") and the
// digest algorithm that must be used on the signature algorithm computation.
ToSignHashField.Value = Convert.ToBase64String(signatureAlg.DigestAlgorithm.ComputeHash(toSignBytes));
DigestAlgorithmField.Value = signatureAlg.DigestAlgorithm.Oid;
}
public ActionResult Start(BatchSignatureStartRequest request)
{
byte[] toSignBytes, transferData;
SignatureAlgorithm signatureAlg;
try {
// Decode the user's certificate
var cert = PKCertificate.Decode(request.CertContent);
// Instantiate a PadesSigner class
var padesSigner = new PadesSigner();
// Set the PDF to sign, which in the case of this example is one of the batch documents
padesSigner.SetPdfToSign(StorageMock.GetBatchDocPath(request.Id));
// Set the signer certificate
padesSigner.SetSigningCertificate(cert);
// Set the signature policy.
padesSigner.SetPolicy(GetSignaturePolicy());
// Set a visual representation for the signature.
padesSigner.SetVisualRepresentation(PadesVisualElements.GetVisualRepresentationForPkiSdk(cert));
// Generate the "to-sign-bytes". This method also yields the signature algorithm that must
// be used on the client-side, based on the signature policy, as well as the "transfer data",
// a byte-array that will be needed on the next step.
toSignBytes = padesSigner.GetToSignBytes(out signatureAlg, out transferData);
} catch (ValidationException ex) {
// Some of the operations above may throw a ValidationException, for instance if the certificate
// encoding cannot be read or if the certificate is expired.
return(new HttpStatusCodeResult(500, ex.ValidationResults.ToString()));
}
// For the next steps, we'll need once again some information:
// - The "transfer data" filename. Its content is stored in a temporary file (with extension .bin) to
// be shared with the Complete action.
// - The "to-sign-hash" (digest of the "to-sign-bytes"). And the OID of the digest algorithm to be
// used during the signature operation. this information is need in the signature computation with
// Web PKI component. (see batch-signature-form.js)
return(Json(new BatchSignatureStartResponse()
{
TransferDataFileId = StorageMock.Store(transferData, ".bin"),
ToSignHash = signatureAlg.DigestAlgorithm.ComputeHash(toSignBytes),
DigestAlgorithmOid = signatureAlg.DigestAlgorithm.Oid
}));
}
public ActionResult Start(SignatureStartModel model)
{
byte[] toSignBytes, transferData;
SignatureAlgorithm signatureAlg;
try {
// Verify if the userfile exists and get its absolute path.
string userfilePath;
if (!StorageMock.TryGetFile(model.UserFile, out userfilePath))
{
return(HttpNotFound());
}
// Decode the user's certificate.
var cert = PKCertificate.Decode(model.CertContent);
// Get an instance of the PadesSigner class.
var padesSigner = new PadesSigner();
// Set the file to be signed.
padesSigner.SetPdfToSign(userfilePath);
// REQUIRED!
// Provide the signer's certificate. You must sign with a valid digital
// certificate of a doctor, who was registered on CRM. In this sample,
// we used a sample certificate stored on server to do the execute this
// sample.
padesSigner.SetSigningCertificate(cert);
// REQUIRED!
// Define the trust arbitrator, which will configure the signer to
// some kind of certificate. In the case of this sample, only
// ICP-Brasil certificates will be accepted in the defined standard.
var trustArbitrator = new LinkedTrustArbitrator(TrustArbitrators.PkiBrazil);
#if DEBUG
// For development purposes, we also trust in Lacuna Software's test certificates.
var lacunaRoot = Lacuna.Pki.PKCertificate.Decode(Convert.FromBase64String("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"));
trustArbitrator.Add(new TrustedRoots(lacunaRoot));
#endif
// REQUIRED!
// Use a policy accepted by ICP-Brasil. We use the trust arbitrator
// defined above to configure the policy.
padesSigner.SetPolicy(PadesPoliciesForGeneration.GetPadesBasic(trustArbitrator));
// REQUIRED!
// Use a custom signature field name. This field MUST have the
// "Emitente" keyword as the last keyword.
padesSigner.SetCustomSignatureFieldName("Signature1 Emitente");
// REQUIRED!
// Set Certification Level to not allow changes after signed.
padesSigner.SetCertificationLevel(PadesCertificationLevel.CertifiedNoChangesAllowed);
// Set a visual representation for the signature.
padesSigner.SetVisualRepresentation(PadesVisualElements.GetVisualRepresentationForPkiSdk(cert));
// Generate the "to-sign-bytes". This method also yields the signature algorithm that must
// be used on the client-side, based on the signature policy, as well as the "transfer data",
// a byte-array that will be needed on the next step.
toSignBytes = padesSigner.GetToSignBytes(out signatureAlg, out transferData);
} catch (ValidationException ex) {
// Some of the operations above may throw a ValidationException, for instance if the certificate
// encoding cannot be read or if the certificate is expired.
ModelState.AddModelError("", ex.ValidationResults.ToString());
return(View());
}
// On the next step (Complete action), we'll need once again some information:
// - The thumbprint of the selected certificate.
// - The "transfer data" used to validate the signature in complete action. Its content is stored in
// a temporary file (with extension .bin) to be shared with the Complete action.
// - The "to-sign-hash" (digest of the "to-sign-bytes") to be signed. (see signature-complete-form.js)
// - The OID of the digest algorithm to be used during the signature operation.
// We'll store these values on TempData, which is a dictionary shared between actions.
TempData["SignatureCompleteModel"] = new SignatureCompleteModel()
{
CertThumb = model.CertThumb,
TransferDataFileId = StorageMock.Store(transferData, ".bin"),
ToSignHash = signatureAlg.DigestAlgorithm.ComputeHash(toSignBytes),
DigestAlgorithmOid = signatureAlg.DigestAlgorithm.Oid
};
return(RedirectToAction("Complete", new { userfile = model.UserFile }));
}
public IHttpActionResult Start(BatchSignatureStartRequest request)
{
byte[] toSignBytes, transferData;
SignatureAlgorithm signatureAlg;
try {
// Decode the user's certificate
var cert = PKCertificate.Decode(request.CertContent);
// Instantiate a PadesSigner class
var padesSigner = new PadesSigner();
// Set the PDF to sign, which in the case of this example is one of the batch documents
padesSigner.SetPdfToSign(Storage.GetBatchDocContent(request.Id));
// Set the signer certificate
padesSigner.SetSigningCertificate(cert);
// Set the signature policy
padesSigner.SetPolicy(getSignaturePolicy());
// Set the signature's visual representation options (this is optional). For more information, see
// http://pki.lacunasoftware.com/Help/html/98095ec7-2742-4d1f-9709-681c684eb13b.htm
var visual = new PadesVisualRepresentation2()
{
// Text of the visual representation
Text = new PadesVisualText()
{
// Compose the message
CustomText = $"Assinado digitalmente por {cert.SubjectDisplayName}",
// Specify that the signing time should also be rendered
IncludeSigningTime = true,
// Optionally set the horizontal alignment of the text ('Left' or 'Right'), if not set the default is Left
HorizontalAlign = PadesTextHorizontalAlign.Left
},
// Background image of the visual representation
Image = new PadesVisualImage()
{
// We'll use as background the image in Content/PdfStamp.png
Content = Storage.GetPdfStampContent(),
// Opacity is an integer from 0 to 100 (0 is completely transparent, 100 is completely opaque).
Opacity = 50,
// Align the image to the right
HorizontalAlign = PadesHorizontalAlign.Right
},
// Set the position of the visual representation
Position = PadesVisualAutoPositioning.GetFootnote()
};
padesSigner.SetVisualRepresentation(visual);
// Generate the "to-sign-bytes". This method also yields the signature algorithm that must
// be used on the client-side, based on the signature policy, as well as the "transfer data",
// a byte-array that will be needed on the next step.
toSignBytes = padesSigner.GetToSignBytes(out signatureAlg, out transferData);
} catch (ValidationException ex) {
// Some of the operations above may throw a ValidationException, for instance if the certificate
// encoding cannot be read or if the certificate is expired.
var message = Request.CreateErrorResponse(HttpStatusCode.InternalServerError, ex.ValidationResults.ToString());
return(ResponseMessage(message));
}
// For the next steps, we'll need once again some information:
// - The "transfer data" filename. Its content is stored in a temporary file (with extension .bin) to
// be shared with the Complete action.
// - The "to-sign-hash" (digest of the "to-sign-bytes"). And the OID of the digest algorithm to be
// used during the signature operation. this information is need in the signature computation with
// Web PKI component. (see batch-signature-form.js)
return(Ok(new BatchSignatureStartResponse()
{
TransferDataFileId = Storage.StoreFile(transferData, ".bin"),
ToSignHash = signatureAlg.DigestAlgorithm.ComputeHash(toSignBytes),
DigestAlgorithmOid = signatureAlg.DigestAlgorithm.Oid
}));
}
public ActionResult Index(SignatureStartModel model)
{
byte[] toSignBytes, transferData;
SignatureAlgorithm signatureAlg;
try {
// Decode the user's certificate
var cert = PKCertificate.Decode(model.CertContent);
// Instantiate a PadesSigner class
var padesSigner = new PadesSigner();
// Set the PDF to sign, which in the case of this example is a fixed sample document
padesSigner.SetPdfToSign(Storage.GetSampleDocContent());
// Set the signer certificate
padesSigner.SetSigningCertificate(cert);
// Set the signature policy
padesSigner.SetPolicy(getSignaturePolicy());
// Set the signature's visual representation options (this is optional). For more information, see
// http://pki.lacunasoftware.com/Help/html/98095ec7-2742-4d1f-9709-681c684eb13b.htm
var visual = new PadesVisualRepresentation2()
{
// Text of the visual representation
Text = new PadesVisualText()
{
// Compose the message
CustomText = String.Format("Assinado digitalmente por {0}", cert.SubjectDisplayName),
// Specify that the signing time should also be rendered
IncludeSigningTime = true,
// Optionally set the horizontal alignment of the text ('Left' or 'Right'), if not set the default is Left
HorizontalAlign = PadesTextHorizontalAlign.Left
},
// Background image of the visual representation
Image = new PadesVisualImage()
{
// We'll use as background the image in Content/PdfStamp.png
Content = Storage.GetPdfStampContent(),
// Opacity is an integer from 0 to 100 (0 is completely transparent, 100 is completely opaque).
Opacity = 50,
// Align the image to the right
HorizontalAlign = PadesHorizontalAlign.Right
},
// Set the position of the visual representation
Position = PadesVisualAutoPositioning.GetFootnote()
};
padesSigner.SetVisualRepresentation(visual);
// Generate the "to-sign-bytes". This method also yields the signature algorithm that must
// be used on the client-side, based on the signature policy, as well as the "transfer data",
// a byte-array that will be needed on the next step.
toSignBytes = padesSigner.GetToSignBytes(out signatureAlg, out transferData);
} catch (ValidationException ex) {
// Some of the operations above may throw a ValidationException, for instance if the certificate
// encoding cannot be read or if the certificate is expired.
ModelState.AddModelError("", ex.ValidationResults.ToString());
return(View());
}
// On the next step (Complete action), we'll need once again some information:
// - The content of the selected certificate only used to render the user's certificate information
// after the signature is completed. It is no longer needed for the signature process.
// - The thumbprint of the selected certificate.
// - The "transfer data" used to validate the signature in complete action.
// - The "to-sign-hash" (digest of the "to-sign-bytes") to be signed. (see signature-complete-form.js)
// - The OID of the digest algorithm to be used during the signature operation.
// We'll store these values on TempData, which is a dictionary shared between actions.
TempData["SignatureCompleteModel"] = new SignatureCompleteModel()
{
CertContent = model.CertContent,
CertThumb = model.CertThumb,
TransferData = transferData,
ToSignHash = signatureAlg.DigestAlgorithm.ComputeHash(toSignBytes),
DigestAlgorithmOid = signatureAlg.DigestAlgorithm.Oid
};
return(RedirectToAction("Complete"));
}
private void startNextSignature()
{
// Increment the index of the document currently being signed.
DocumentIndex += 1;
// Check if we have reached the end of the batch, in which case we fill the hidden field
// "ToSignHashField" with value "(end)", which signals to the javascript on batch-signature-form.js
// that the process is completed and the page can be unblocked.
if (DocumentIndex == DocumentIds.Count)
{
ToSignHashField.Value = "(end)";
return;
}
// Get the ID of the document currently being signed.
var docId = DocumentIds[DocumentIndex];
byte[] toSignBytes, transferData;
SignatureAlgorithm signatureAlg;
try {
// Decode the user's certificate.
var cert = PKCertificate.Decode(Convert.FromBase64String(CertificateField.Value));
// Instantiate a PadesSigner class.
var padesSigner = new PadesSigner();
// Set the PDF to sign.
padesSigner.SetPdfToSign(Storage.GetBatchDocContent(docId));
// Set the signer certificate.
padesSigner.SetSigningCertificate(cert);
// Set the signature policy.
padesSigner.SetPolicy(getSignaturePolicy());
// Set the signature's visual representation options (optional).
padesSigner.SetVisualRepresentation(getVisualRepresentation(cert));
// Generate the "to-sign-bytes". This method also yields the signature algorithm that must
// be used on the client-side, based on the signature policy, as well as the "transfer data",
// a byte-array that will be needed on the next step.
toSignBytes = padesSigner.GetToSignBytes(out signatureAlg, out transferData);
}
catch (ValidationException ex) {
// One or more validations failed. We log the error, update the page with a summary of what
// happened to this document and start the next signature.
logger.Error(ex, "Validation error starting the signature of a batch document");
setValidationError(ex.ValidationResults);
startNextSignature();
return;
}
catch (Exception ex) {
// An error has occurred. We log the error, update the page with a summary of what happened to
// this document and start the next signature.
logger.Error(ex, "Error starting the signature of a batch document");
setError(ex.Message);
startNextSignature();
return;
}
// The "transfer data" for PDF signatures can be as large as the original PDF itself. Therefore, we
// mustn't use a hidden field on the page to store it. Here we're using our storage mock
// (see file Classes\Storage.cs) to simulate storing the transfer data on a database and saving on a
// hidden field on the page only the ID that can be used later to retrieve it. Another option would
// be to store the transfer data on the Session dictionary.
TransferDataFileIdField.Value = Storage.StoreFile(transferData);
// Send to the javascript the "to sign hash" of the document (digest of the "to-sign-bytes") and the
// digest algorithm that must be used on the signature algorithm computation
ToSignHashField.Value = Convert.ToBase64String(signatureAlg.DigestAlgorithm.ComputeHash(toSignBytes));
DigestAlgorithmField.Value = signatureAlg.DigestAlgorithm.Oid;
}