PDFDigitalSignatureBySelfSignedCertificate

PDF数字签名 自签名CA证书 Spire.Pdf

前言：最近有个需求是需要对文档进行数字签名； 描述：本示例基于Spire.Pdf组件对PDF进行数字签名，演示了签名证书使用项目 CreateSelfSignedCertificateByBouncyCastle(https://github.com/daileass/CreateSelfSignedCertificateByBouncyCastle.git) 生成的自签名证书pfx，解决了数字签名后文档头部有警告

部分代码：

        var fileCert = System.Environment.CurrentDirectory + "\\Cert\\";
        var file = System.Environment.CurrentDirectory + "\\File\\";
        var filePath = file + "dome.pdf";
        var newFilePath = file + $"dome_{DateTime.Now.ToString("yyyyMMddHHmmss")}.pdf";
        var pfxFilePath = fileCert + "edd9386229324d969692dcabf97ac095dpps.fun.pfx";
        var pfxFilePwd = "ABCD123456";
        var signFilePath = file + "sign.png";

        // 数字签名
        var digitalSignature = new DigitalSignature(
            File2Bytes(filePath),
            File2Bytes(signFilePath),
            "Sign Here:",
            File2Bytes(pfxFilePath),
            pfxFilePwd
            );
        var stream = digitalSignature.Signature();

        // 保存签名后的文件
        using (var fileStream = File.Create(newFilePath))
        {
            stream.Seek(0, SeekOrigin.Begin);
            stream.CopyTo(fileStream);
        }

        Console.WriteLine("OK");
        Console.ReadLine();