The format PRIVATE KEY is not yet implemented

[jl2035]

I would like to load a pem file into C# and I can't find the proper tool. I was hoping pem-utils is exactly what I need, but I'm getting the following error:

Unhandled Exception: System.NotImplementedException: The format PRIVATE KEY is not yet implemented

I didn't know there are other formats besides "PRIVATE KEY". Is any other format 'implemented' in this library?

This is how my code looks like:

        RSA rsa = RSA.Create();
        string file = "/home/user/certs/ca5.pem";
        using (var stream = File.OpenRead(file))
        using (var reader = new PemReader(stream))
        {
            var rsaParameters = reader.ReadRsaKey();
            rsa.ImportParameters(rsaParameters);
        }
        Console.WriteLine("RSA: " + rsa.KeySize);

It crashes at ReadRsaKey() line.

Any help would be great.

[huysentruitw]

The only private key format currently supported is RSA PRIVATE KEY (which is the most common one). What type of key are you dealing with?

If possible, can you generate a similar private key that you can share as a test key here?

[jl2035]

Many thanks to you, sir! I used the Keystore Explorer tool to generate private key, and for some reason this tool generates the first line as PRIVATE KEY and not RSA PRIVATE KEY. If I generate the key using openssl it all works fine.

[jl2035]

Hi, now I'm getting the following error:

Unhandled Exception: System.InvalidOperationException: Data on the stream doesn't match the required PEM format

What does that mean?

[huysentruitw]

It means your private key does not adhere to this regular expression: https://github.com/huysentruitw/pem-utils/blob/master/src/PemUtils/PemReader.cs#L56

Can you please post an example private key?

[jl2035]

Sorry, I've also figured this out. I had both keys in the file. After removing public key from the file (and with correct format "BEGIN RSA PRIVATE KEY") it worked.