C# - Private Key Does Not Persist Even With X509KeyStorageFlags.PersistKeySet
Dec 9, 2010
I am storing a key pair in Windows Store, and recently started receiving the "Keyset does not exist" error. Investigating a bit further i found out it could be two things, 1 - The private key is not stored with the persist key set attribute (X509KeyStorageFlags.PersistKeySet) and 2 - access rights to the key. I have tried both 1 and 2 with no success on one machine (in my machine it works apparently). The strange thing is that when i look into MicrosoftCryptoRSAMachineKeys (and S-1-5-18) the key remains there but only for a period of time then it is deleted which means that it is not persisting.
//If decoded then save as RSACryptoServiceProvider
newCert.PrivateKey = DecodePrivateKey(privateKeyFile, pkPassword)
if (newCert.PrivateKey == null)
throw new System.NullReferenceException("Decoded private key resulted in a null reference. Unable to store certificate.");
byte[] pfx = newCert.Export(X509ContentType.Pfx);
newCert = new X509Certificate2(pfx, string.Empty, X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet);
I am running this code on a WCF Service hosted on IIS, and the certificate is deleted even if i give permissions to Network Service, the AppPoolIdentity, my account, etc through MMC-CertMgr. Would anyone know why this happens?
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