Luke Pothier lukepothier

Approaching a Xamarin.Android Bindings Case

1. Investigation

One of the best ways to investigate a problematic Xamarin.Android Binding is to first ensure you have the proper tooling available:

Diagnostic MSBuild Output Enabled(Instructions)
Java Decompiler(http://jd.benow.ca/)
.NET Decompiler(https://www.jetbrains.com/decompiler/)
Binding SDK Documentation

Don't use VPN services.

No, seriously, don't. You're probably reading this because you've asked what VPN service to use, and this is the answer.

Note: The content in this post does not apply to using VPN for their intended purpose; that is, as a virtual private (internal) network. It only applies to using it as a glorified proxy, which is what every third-party "VPN provider" does.

A Russian translation of this article can be found here, contributed by Timur Demin.
A Turkish translation can be found here, contributed by agyild.
There's also this article about VPN services, which is honestly better written (and has more cat pictures!) than my article.

	private byte[] rsa2048Asn1Header = new byte[] {0x30, 0x82, 0x01, 0x22, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
	0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, 0x0f, 0x00};

	public override void DidReceiveChallenge(NSUrlSession session, NSUrlAuthenticationChallenge challenge, Action<NSUrlSessionAuthChallengeDisposition, NSUrlCredential> completionHandler)
	{
	//Sample implementation using SHA1Managed
	var secServerChain = challenge.ProtectionSpace.ServerSecTrust;

	int certCount = challenge.ProtectionSpace.ServerSecTrust.Count;