从证书存储导入的 X509 证书没有私钥

Question

有一些简单的代码可以使用以下命令将带有私钥的证书导入到 Windows 证书存储中.net core 2.2：

  using (var store = new X509Store(StoreName.Root,StoreLocation.CurrentUser))
  {
      store.Open(OpenFlags.ReadWrite);
      store.Add(cert);
      store.Close();
  }

还有一些同样简单的代码可以再次将其读出来：

 using (var store = new X509Store(StoreName.Root,StoreLocation.CurrentUser))
 {
    store.Open(OpenFlags.ReadOnly);
    var certCollection = store.Certificates.Find(X509FindType.FindBySubjectName, commonName, validOnly);
    store.Close();
    return certCollection;
 }

然而，尽管证书已成功检索到 certCollection 中，但它的私钥为 null 并且 hasPrivateKey 为 false，即使它们在之前的调用中不为 null 且为 true Add。为什么是这样？

更新：

using (RSA rsa = RSA.Create(keySize)) {    
     CertificateRequest certRequest = new CertificateRequest(
         subjectName,
         rsa,
         HashAlgorithmName.SHA512,
         RSASignaturePadding.Pkcs1);

     certRequest.CertificateExtensions
         .Add(newX509SubjectKeyIdentifierExtension(certRequest.PublicKey, false));  
     return certRequest;
}

Answer 1

您的密钥被创建为临时密钥，因此当将其添加到持久存储时，该密钥将被丢弃。

If you want to persist the key into the store certificate, you either need to create it as a persisted key directly, or export to a PFX then re-import (which is the easiest form):

// If you're planning on saving to a LocalMachine store you should also | in the
// X509KeyStorageFlags.MachineKeySet bit.
X509KeyStorageFlags storageFlags = X509KeyStorageFlags.PersistKeySet;

X509Certificate2 certWithPersistedKey =
    new X509Certificate2(
        certWithEphemeralKey.Export(X509ContentType.Pkcs12, ""),
        "",
        storageFlags);

Now certWithPersistedKey can be added like you expect.