我是 iTextSharp (和 StackOverFlow) 的新手。我正在尝试使用外部 USB 令牌在 C# 中签署 PDF 文档。我尝试使用从互联网上找到的以下代码。
Org.BouncyCastle.X509.X509CertificateParser cp = new Org.BouncyCastle.X509.X509CertificateParser();
//Get Sertifiacte
X509Certificate2 certClient = null;
X509Store st = new X509Store(StoreName.My, StoreLocation.CurrentUser);
st.Open(OpenFlags.MaxAllowed);
X509Certificate2Collection collection = X509Certificate2UI.SelectFromCollection(st.Certificates, "Please choose certificate:", "", X509SelectionFlag.SingleSelection);
if (collection.Count > 0){
certClient = collection[0];
}
st.Close();
//Get Cert Chain
IList<Org.BouncyCastle.X509.X509Certificate> chain = new List<Org.BouncyCastle.X509.X509Certificate>();
X509Chain x509chain = new X509Chain();
x509chain.Build(certClient );
foreach (X509ChainElement x509ChainElement in x509chain.ChainElements){
chain.Add(DotNetUtilities.FromX509Certificate(x509ChainElement.Certificate));
}
PdfReader reader = new PdfReader(sourceDocument);
FileStream resStream = new FileStream(resultDocument, FileMode.Create, FileAccess.ReadWrite);
PdfStamper stamper = PdfStamper.CreateSignature(reader, resStream , '\0', null, true);
PdfSignatureAppearance appearance = stamper.SignatureAppearance;
appearance.Reason = reason;
appearance.Location = location;
appearance.SetVisibleSignature(new iTextSharp.text.Rectangle(20, 10, 170, 60), 1, "Signed");
X509Certificate2Signature es = new X509Certificate2Signature(certClient, "SHA-1");
MakeSignature.SignDetached(appearance, es, chain, null, null, null, 0, CryptoStandard.CMS);
问题在于我收到了一个异常:
System.Security.Cryptography.CryptographicException was unhandled
Message=Invalid type specified.
Source=mscorlib
StackTrace:
at System.Security.Cryptography.CryptographicException.ThrowCryptographicException(Int32 hr)
at System.Security.Cryptography.Utils._GetKeyParameter(SafeKeyHandle hKey, UInt32 paramID)
at System.Security.Cryptography.Utils.GetKeyPairHelper(CspAlgorithmType keyType, CspParameters parameters, Boolean randomKeyContainer, Int32 dwKeySize, SafeProvHandle& safeProvHandle, SafeKeyHandle& safeKeyHandle)
at System.Security.Cryptography.RSACryptoServiceProvider.GetKeyPair()
at System.Security.Cryptography.RSACryptoServiceProvider..ctor(Int32 dwKeySize, CspParameters parameters, Boolean useDefaultKeySize)
at System.Security.Cryptography.X509Certificates.X509Certificate2.get_PrivateKey()
at iTextSharp.text.pdf.security.X509Certificate2Signature..ctor(X509Certificate2 certificate, String hashAlgorithm)
at WindowsFormsApplication1.PDFSignerHelper.signPdfFile(String sourceDocument, String resultDocument, X509Certificate2 certClient, String reason, String location)
InnerException: