How to use APNs Auth Key (.p8 file) in C #?
I am trying to send push notifications to iOS devices using token based authentication.
As required, I generated APNs Auth Key in the Apple Dev Portal and uploaded it (it is a p8 file).
In order to send push notifications from my C # server I need to somehow use this p8 file to sign my JWT tokens. How to do it?
I tried uploading the file to X509Certificate2 but X509Certificate2 doesn't seem to accept p8 files, so I tried converting the file to pfx / p12 but couldn't find a way to do it, which actually works.
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I found a way to do this using BouncyCastle :
private static CngKey GetPrivateKey()
{
using (var reader = File.OpenText("path/to/apns/auth/key/file.p8"))
{
var ecPrivateKeyParameters = (ECPrivateKeyParameters)new PemReader(reader).ReadObject();
var x = ecPrivateKeyParameters.Parameters.G.AffineXCoord.GetEncoded();
var y = ecPrivateKeyParameters.Parameters.G.AffineYCoord.GetEncoded();
var d = ecPrivateKeyParameters.D.ToByteArrayUnsigned();
return EccKey.New(x, y, d);
}
}
And now we create and sign the token (using jose-jwt ):
private static string GetProviderToken()
{
var epochNow = (int) DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1)).TotalSeconds;
var payload = new Dictionary<string, object>()
{
{"iss", "your team id"},
{"iat", epochNow}
};
var extraHeaders = new Dictionary<string, object>()
{
{"kid", "your key id"}
};
var privateKey = GetPrivateKey();
return JWT.Encode(payload, privateKey, JwsAlgorithm.ES256, extraHeaders);
}
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