Reading PEM RSA Public Key Only using Bouncy Castle

Question

I am trying to use C# to read in a .pem file that contains only a RSA public key. I do not have access to the private key information, nor does my application

Answer 1

The following code will read a public key from a given filename. The exception handling should be changed for any production code. This method returns an AsymetricKeyParameter:

public Org.BouncyCastle.Crypto.AsymmetricKeyParameter ReadAsymmetricKeyParameter(string pemFilename)
{
    var fileStream = System.IO.File.OpenText(pemFilename);
    var pemReader = new Org.BouncyCastle.OpenSsl.PemReader(fileStream);
    var KeyParameter = (Org.BouncyCastle.Crypto.AsymmetricKeyParameter)pemReader.ReadObject();
    return KeyParameter;
}