使用 X509 证书进行消息签名

Question

我正在使用以下代码在 asp.net 网络服务中使用数字证书签署消息。 签名工作正常，预计 signedMessage.ComputeSignature 行最多需要 30 到 40 秒，因为我面临超时异常。当我在 Windows 窗体应用程序下运行时，相同的代码会在几分之一秒内产生结果。任何线索或帮助。

   public static string Encrypt(string fullMessage, string certificateName, bool deAttch)
    {
        X509Certificate2 signer = GetCertificate(certificateName);  
        byte[] contentBytes = Encoding.ASCII.GetBytes(fullMessage);  
        Oid contentOid = new Oid("1.2.840.113549.1.7.1", "PKCS 7 Data");
        SignedCms signedMessage = new SignedCms(new ContentInfo(contentOid, contentBytes), deAttch);

        signedMessage.ComputeSignature(new CmsSigner(signer));

        byte[] signedBytes = signedMessage.Encode();
        return Convert.ToBase64String(signedBytes).Trim();
        }

Answer 1

我不确定这是否应该是一个答案（我不知道它会造成什么影响，但我会找出答案）。只是设置一个属性

cert.IncludeOption = X509IncludeOption.EndCertOnly;    

的

CmsSigner cert = new CmsSigner(signer);

以前我使用构造函数创建对象并直接传递给方法。现在它工作正常，不需要花费太多时间。

   public static string Encrypt(string fullMessage, string certificateName, bool deAttch)
    {
        X509Certificate2 signer = GetCertificate(certificateName);  
        byte[] contentBytes = Encoding.ASCII.GetBytes(fullMessage);  
        Oid contentOid = new Oid("1.2.840.113549.1.7.1", "PKCS 7 Data");
        SignedCms signedMessage = new SignedCms(new ContentInfo(contentOid, contentBytes), deAttch);
        CmsSigner cert = new CmsSigner(signer);
        cert.IncludeOption = X509IncludeOption.EndCertOnly;            
        signedMessage.ComputeSignature(cert);
        byte[] signedBytes = signedMessage.Encode();
        return Convert.ToBase64String(signedBytes).Trim();
        }


        private static X509Certificate2 GetCertificate(string certificateName)
    {
        X509Store store = new X509Store(StoreName.My, StoreLocation.LocalMachine);
        store.Open(OpenFlags.OpenExistingOnly | OpenFlags.ReadOnly);
        X509Certificate2 certificate = store.Certificates.Cast<X509Certificate2>().Where(cert => cert.Subject.IndexOf(certificateName) >= 0).FirstOrDefault();
        if (certificate == null)
            throw new Exception("Certificate " + certificateName + " not found.");

        return certificate;
    }