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我正在尝试使用 Aspose Pdf 对 PDF 进行数字签名，方法是使用外部设备实际进行签名，在本例中为 Azure Key Vault。iText 对此有一个非常好的机制。它们提供了您可以实现的 IExternalSignature 接口，该接口提供了 Sign 功能，但是我找不到与 Aspose Pdf 类似的任何东西。

我正在使用此博客文章中的示例：https ://rahulpnath.com/blog/signing-a-pdf-file-using-azure-key-vault/

有谁知道如何使用 Aspose Pdf 实现第三个示例（不可导出证书）？

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1 回答 1

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您可以使用ExternalSignature提供X509Certificate2签名文档的对象。请使用以下代码片段。在这些示例中，Windows 证书存储用于获取用于签名的证书：

// The System.Security.dll assembly should be added into References

// Signing 1. Using SignatureField
public void Sign_With_SmartCard_1()
{
    const string dataDir = @"c:\";

    File.Copy(dataDir + "blank.pdf", dataDir + "externalSignature1.pdf", true);
    using (FileStream fs = new FileStream(dataDir + "externalSignature1.pdf", FileMode.Open, FileAccess.ReadWrite))
    {
        using (Document doc = new Document(fs))
        {
            SignatureField field1 = new SignatureField(doc.Pages[1], new Rectangle(100, 400, 10, 10));

            // Sign with certificate selection in the windows certificate store
            X509Store store = new X509Store(StoreLocation.CurrentUser);
            store.Open(OpenFlags.ReadOnly);
            // Manually chose the certificate in the store
            X509Certificate2Collection sel = X509Certificate2UI.SelectFromCollection(store.Certificates, null, null, X509SelectionFlag.SingleSelection);

            Aspose.Pdf.Forms.ExternalSignature externalSignature = new Forms.ExternalSignature(sel[0])
            {
                Authority = "Me",
                Reason = "Reason",
                ContactInfo = "Contact"
            };

            field1.PartialName = "sig1";
            doc.Form.Add(field1, 1);
            field1.Sign(externalSignature);
            doc.Save();
        }
    }

    using (PdfFileSignature pdfSign = new PdfFileSignature(dataDir + "externalSignature1.pdf"))
    {
        IList<string> sigNames = pdfSign.GetSignNames();
        for (int index = 0; index <= sigNames.Count - 1; index++)
        {
            if (!pdfSign.VerifySigned(sigNames[index]) || !pdfSign.VerifySignature(sigNames[index]))
            {
                throw new ApplicationException("Not verified");
            }
        }
    }
}

// Signing 2. Using PdfFileSignature
public void Sign_With_SmartCard_2()
{
    const string dataDir = @"c:\";

    Document doc = new Document(dataDir + "blank.pdf");

    using (PdfFileSignature pdfSign = new PdfFileSignature())
    {
        pdfSign.BindPdf(doc);

        //Sign with certificate selection in the windows certificate store
        X509Store store = new X509Store(StoreLocation.CurrentUser);
        store.Open(OpenFlags.ReadOnly);
        //manually chose the certificate in the store
        X509Certificate2Collection sel = X509Certificate2UI.SelectFromCollection(store.Certificates, null, null, X509SelectionFlag.SingleSelection);

        Aspose.Pdf.Forms.ExternalSignature externalSignature = new Forms.ExternalSignature(sel[0]);
        pdfSign.SignatureAppearance = dataDir + "demo.png";
        pdfSign.Sign(1, "Reason", "Contact", "Location", true, new System.Drawing.Rectangle(100, 100, 200, 200), externalSignature);
        pdfSign.Save(dataDir + "externalSignature2.pdf");
    }

    using (PdfFileSignature pdfSign = new PdfFileSignature(dataDir + "externalSignature2.pdf"))
    {
        IList<string> sigNames = pdfSign.GetSignNames();
        for (int index = 0; index <= sigNames.Count - 1; index++)
        {
            if (!pdfSign.VerifySigned(sigNames[index]) || !pdfSign.VerifySignature(sigNames[index]))
            {
                throw new ApplicationException("Not verified");
            }
        }
    }
}

我们希望这会有所帮助。如果您需要任何进一步的帮助，请随时与我们联系。

于 2019-02-28T21:38:13.393 回答