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A standard .NET application tries to install a certificate in a PFX file (PKCS12) programmatically by using the X509Certificate or X509Certificate2 class with code like the following example: The following type of exception will occur when you try to use the certificate's private key within another application: Your email address will not be published. We don't have any way of representing the EdDSA keys internally, so we think that the private key blob is invalid. For the most part the answer for this is in Digital signature in c# without using BouncyCastle, but if you can move to .NET Core 3.0 things get a lot easier. Decrypt with PrivateKey X.509 Certificate, read pem file, get 63 bytes in DQ parameter, Associate a private key with the X509Certificate2 class in .net. density matrix. These server certificates require additional steps when hosting a TcpListener in C# (I guess because the CSR wasn't used) but what if I do have the Private Key, and the Certificate that OpenSSL generates/uses. Thanks, @bartonjs, If I got to .NET Core, ill use this - for now, I'l just use a Process() to get OpenSSL to make the .pfx file, since I have the .crt and .key files at hand. You can also manually create Excel files, but the above functionality is what really impressed me. C# (CSharp) System.Security.Cryptography.X509Certificates X509Certificate2.Import - 33 examples found. Loading a PFX with unsupported algorithms reports bad password over unsupported algorithm. How are we doing? A key exists for each store name (folder), and then under the Certificates sub key is a key with a long, random-looking name. (Workarounds would be possible by writing a custom loader using Pkcs12Info, P/Invoking to OpenSSL to load a EdDSA key object, and using private reflection to force the cert object to know about the private key but since that involves private reflection it isn't anything that we'd support or guarantee works across updates). I've had all kinds of bug reports about this. Starting in .NET Framework 4.7.2 or .NET Core 2.0 you can combine a cert and a key. Creates a new X509 certificate from the file contents of an RFC 7468 PEM-encoded certificate and private key. https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.x509certificates.x509certificate2?redirectedfrom=MSDN&view=netframework-4.8, https://forums.iis.net/t/1224708.aspx?C+ProgramData+Microsoft+Crypto+RSA+MachineKeys+is+filling+my+disk+space, https://stackoverflow.com/questions/34527477/clean-my-machinekeys-folder-by-removing-multiple-rsa-files-without-touching-iis?noredirect=1&lq=1, https://stackoverflow.com/questions/22618568/prevent-file-creation-when-x509certificate2-is-created, https://docs.microsoft.com/da-dk/windows/win32/seccng/key-storage-and-retrieval, https://security.stackexchange.com/questions/1771/how-can-i-enumerate-all-the-saved-rsa-keys-in-the-microsoft-csp/102923, https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.x509certificates.x509certificate2, Introducing the Next-Generation Bing Search: Smarter, Faster, and More Personalized than Ever Before, Add NuGet package XML documentation to Swagger, Heres why you should use gRPC for everything, %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA\S-1-5-18\, %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA\S-1-5-19\, %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA\S-1-5-20\, %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA\MachineKeys, %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\SystemKeys, %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\Keys, Microsoft Internet Information Server Certificate.