由iTextSharp 5或iText7 dotnet签署的PDF显示，iText和Adobe有效，但欧盟DSS演示版无效

Question

我发现最新的iText5存在PDF签名问题。我知道那个版本已经被弃用了，但我必须使用旧版本，因为我需要在一个不比旧版本更新的环境中使用它。NET框架v3。5个是允许的。

对于歌唱文档，客户端可以使用软件或硬件密钥。我们公司已经使用了RSA签名，但现在我们也必须实现对ECDsa密钥的支持。这就是为什么我试图用iText的PrivateKeySignature类对PDF文件进行签名，并调用MakeSignature。签名分离方法。

当我使用RSA密钥对PDF进行签名，并尝试使用欧盟委员会的DSS演示应用程序（https://ec.europa.eu/cefdigital/DSS/webapp-demo/validation）验证签名时，它对签名没有问题，只是它不接受证书颁发者作为受信任的CA。那很好，因为我使用内部CA生成的测试密钥，仅供开发人员使用。

但如果我使用ECDSA密钥对PDF进行签名，DSS演示应用程序会显示“签名不完整”。

我用于签名的代码：

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);

我使用的课程如下：https://gist.github.com/azure-hu/822229714a6ca896682bbb903e1b1ecf，但即使我尝试使用iText提供的示例，也会发生同样的情况。（例如：https://kb.itextsupport.com/home/it5kb/examples/digital-signatures-chapter-2#Digitalsignatures-第2-c2章（签名世界）

在创建ECDsa签名的PDF文件时，我是否错过了什么？也许iTextSharp 5只能使用RSA或DSA密钥对PDF文件进行签名？

Answer 1

就像@mval在评论中提到的那样，iText使用公钥算法OID作为签名算法OID。

如果RSA与此处相同，则为RSA密钥和RSASSA指定相同的OID（使用PKCS#1 v1.5填充）。

ECDSA并非如此，因此eSignature DSS抱怨。另一方面，Adobe Acrobat（Reader）非常松懈。它实际上忽略了签名算法OID字段，您甚至可以在该字段中使用带有RSA OID的ECDSA签名，而当前的Acrobat不会抱怨。

要解决此问题，请使用IExternalSignatureContainer实现，而不是IExternalSignature实现并调用MakeSignature。SignExternalContainer而不是MakeSignature。签名分离。在IExternalSignatureContainer实现中，可以使用BouncyCastle或Windows Crypto API类创建CMS签名容器。

与iText方面不正确的签名算法OID相关的其他问题：

• ECDSA签名的PDF无法通过iText 7（C#）进行签名验证，但在Adobe Reader DC上成功
• C#Itext7签名的pdf签名在Foxit pdf Reqader中无效，但在Acrobat reader中有效