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

Instead of:

keyPair = (Org.BouncyCastle.Crypto.AsymmetricCipherKeyPair)new Org.BouncyCastle.OpenSsl.PemReader(reader).ReadObject();

Use:

keyPair = (Org.BouncyCastle.Crypto.AsymmetricKeyParameter)new Org.BouncyCastle.OpenSsl.PemReader(reader).ReadObject();

Since you are only using a public key and you don't actually have a pair of keys (public & private) you can't cast it as 'AsymmetricCipherKeyPair' you should cast it as 'AsymmetricKeyParameter'.