C#如何在Asp.net 5中使用弹跳城堡代替x509certificate2进行S/Mime

using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.X509;

// 加载PFX格式的证书和私钥
var certificateStream = new FileStream("path/to/certificate.pfx", FileMode.Open);
var certificatePassword = "certificate_password";
var certificate = new X509CertificateParser().ReadCertificate(certificateStream);
var privateKey = new X509CertificateParser().ReadPrivateKey(certificateStream, certificatePassword.ToCharArray());
certificateStream.Close();

// 创建S/MIME消息
var smimeMessage = new MimeMessage();
smimeMessage.From.Add(new MailboxAddress("Sender", "sender@example.com"));
smimeMessage.To.Add(new MailboxAddress("Recipient", "recipient@example.com"));
smimeMessage.Subject = "S/MIME Test";
smimeMessage.Body = new TextPart("plain")
{
    Text = "This is a test S/MIME message."
};

using Org.BouncyCastle.Cms;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Security;

// 加密消息
var envelopedGenerator = new CmsEnvelopedDataGenerator();
envelopedGenerator.AddKeyTransRecipient(certificate);
var envelopedData = envelopedGenerator.Generate(smimeMessage.Body);

// 签名消息
var signedGenerator = new CmsSignedDataGenerator();
signedGenerator.AddSigner(privateKey, certificate, CmsSignedDataGenerator.DigestSha256);
signedGenerator.AddCertificates(new X509CertificateStore(new X509Certificate[] { certificate }));
var signedData = signedGenerator.Generate(envelopedData, true);

// 导出加密和签名后的消息
var encryptedAndSignedMessage = signedData.GetEncoded();