分配和验证数字签名

介绍

使用“数字签名”对话框附加数字签名。数字签名对话框列出了有效的证书。您可以使用“数字签名”对话框查看证书并选择您要使用的证书。如果工作簿有数字签名,签名的名称会出现在证书名称场地。如果您单击去掉数字签名对话框中的按钮,Microsoft Excel 也会删除数字签名。

Aspose.Cells 提供了Aspose.Cells.DigitalSignatures命名空间来执行作业(分配和验证数字签名)。命名空间具有一些用于添加和验证数字签名的有用功能。

请参阅以下示例代码,它描述了如何使用 Aspose.Cells for .NET API 执行任务。

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
// dsc is signature collection contains one or more signature needed to sign
DigitalSignatureCollection dsc = new DigitalSignatureCollection();
// Cert must contain private key, it can be contructed from cert file or windows certificate collection. aa is password of cert
X509Certificate2 cert = new X509Certificate2(dataDir + "mykey2.pfx", "aa");
DigitalSignature ds = new DigitalSignature(cert, "test for sign", DateTime.Now);
dsc.Add(ds);
Workbook wb = new Workbook();
// wb.SetDigitalSignature signs all signatures in dsc
wb.SetDigitalSignature(dsc);
wb.Save(dataDir + @"newfile_out.xlsx");
// open the file
wb = new Workbook(dataDir + @"newfile_out.xlsx");
System.Console.WriteLine(wb.IsDigitallySigned);
// Get digitalSignature collection from workbook
dsc = wb.GetDigitalSignature();
foreach (DigitalSignature dst in dsc)
{
System.Console.WriteLine(dst.Comments); //test for sign -OK
System.Console.WriteLine(dst.SignTime); //11/25/2010 1:22:01 PM -OK
System.Console.WriteLine(dst.IsValid); //True -OK
}

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