CODEWITHSUNDEEP
itextc#-3.0
azur3
azur3

Reputation: 43

PDF signed by iTextSharp 5 or iText7-dotnet shows valid by iText and Adobe, but not by EU DSS Demo

I PDF signing problems with the latest iTextSharp 5. I know that version is already deprecated, but I must use the older one, because I need to use it in an environment, where no newer than .NET Framework v3.5 is allowed.

For singing documents, the clients may use software or hardware keys. We already used RSA signatures in our company, but now we have toimplement support for ECDsa keys too. That's why I tried to sign PDF files with iText's PrivateKeySignature class, and calling MakeSignature.SignDetached method.

When I use RSA key for signing a PDF, and try to verify signature with European Commission's DSS Demonstration App (https://ec.europa.eu/cefdigital/DSS/webapp-demo/validation), it has no issue with the signature, only that it not accepts the certificate issuer as a trusted CA. That's fine, because I use a test key generated by an internal CA for developer use only.

But if I use ECDSA key for signing a PDF, the DSS Demonstration App says "Signature is not intact.".

The code I use for signing:

AbstractPdfSigner pdfSigner = new PdfSigner();
pdfSigner.SignAsPkcs7Detached = false;
pdfSigner.SignMethod = "Hashed;
pdfSigner.SignReason = "The Quick Brown Fox Jumps Over The Lazy Dog";
pdfSigner.SignLocation = "Test Location";
pdfSigner.SignToNewRevision = true;

pdfSigner.TsaClientUrl = "https://bteszt.e-szigno.hu/tsa";
pdfSigner.TsaClientLogin = "teszt";
pdfSigner.TsaClientPwd = "teszt";
pdfSigner.TsaClientAuthenticationCertificate = null;

pdfSigner.EnableOcsp = false;
pdfSigner.OcspUrl = null;

pdfSigner.HashAlgorithmId = "SHA256";

pdfSigner.VisibleSignatureX1 = 10;
pdfSigner.VisibleSignatureY1 = 10;
pdfSigner.VisibleSignatureX2 = 250;
pdfSigner.VisibleSignatureY2 = 90;

string testPdf = "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";
pdfSigner.InputPdfBuffer = Convert.FromBase64String(testPdf);

Status status = pdfSigner.Sign(this.Handle, null);

The classes I use are here: https://gist.github.com/azure-hu/822229714a6ca896682bbb903e1b1ecf, but the same happened even if I tried to use examples provided by iText. (for example: https://kb.itextsupport.com/home/it5kb/examples/digital-signatures-chapter-2#Digitalsignatures-chapter2-c2_01_signhelloworld)

Is there anything I miss when creating ECDsa signed PDF files? Maybe iTextSharp 5 only able to sign PDF files with RSA or DSA keys?

Upvotes: 2

Views: 838

Answers (1)

mkl
mkl

Reputation: 95928

Just like @mval mentioned in a comment, iText uses the public key algorithm OID as signature algorithm OID.

In case of RSA that is ok as here the same OID is specified for a RSA key and for RSASSA (with PKCS#1 v1.5 padding).

This is not the case for ECDSA, so eSignature DSS complains. Adobe Acrobat (Reader) on the other hand is very lax. It actually ignores the signature algorithm OID field, you could even have an ECDSA signature with the RSA OID in that field and the current Acrobat wouldn't complain.

To fix this use an IExternalSignatureContainer implementation instead of an IExternalSignature implementation and call MakeSignature.SignExternalContainer instead of MakeSignature.SignDetached. In your IExternalSignatureContainer implementation you can use BouncyCastle or Windows Crypto API classes to create a CMS signature container.

Other questions related to incorrect signature algorithm OIDs in respect to iText:

Upvotes: 1

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