How do I use a private key in C#? “Cannot find the requested object.”

Question

I\'m trying to implement authentication for MasterCard Match, as part of their following documentation, they have a sample private key:

https://developer.mastercard.

Answer 1

I can't remember exactly but I believe pem files can not be used. You'll need something like bouncy castle.

I don't remember much but it loads PEM files. Occasionally it will not like it but its somewhat rare. I don't know if it can be used but I do know i successfully used private/public keys with it. I have no idea how to convert it to something that works with .NET ssl library.

However I suggest you convert it to pem to something that is more compatible with .NET implementation if you are using .net implementation rather then bouncy castle. I used bouncycastle and it worked for my project which didnt need to interface with another library.

using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.OpenSsl;
using System.IO;
using System.Security.Cryptography;

//elsewhere

        using (var reader = File.OpenText(fileName))
        {
            var pemReader = new PemReader(reader);
            var bouncyRsaParameters = (RsaPrivateCrtKeyParameters)pemReader.ReadObject();
            var rsaParameters = DotNetUtilities.ToRSAParameters(bouncyRsaParameters);
            this.PrivateKey = new RSACryptoServiceProvider();
            this.PrivateKey.ImportParameters(rsaParameters);
        }

Answer 2

You could try to use a relative path instead of an absolute one?

Just put the file in the root of your project and try to use only the filename, without the path.