/* TLS hanshake callback */
/* Extract a public key from certificate and append to a header specific to the key type
* Returns nil if the key type in the certificate can not be recognized/extracted
*/
byte[] PublicKeyWithHeader(X509Certificate2 cert)
{
/* We need to use java native code to allow ECC public key extraction which is
* not implemented in C#/Xamarin
*/
byte[] rawData = cert.GetRawCertData();
Java.Security.Cert.CertificateFactory certFactory = Java.Security.Cert.CertificateFactory.GetInstance("X.509");
System.IO.Stream inputBytes = new System.IO.MemoryStream(rawData);
try
{
var javaCert = certFactory.GenerateCertificate(inputBytes);
Java.Security.IPublicKey publicKey = javaCert.PublicKey;
byte[] encoded = publicKey.GetEncoded();
if (encoded == null)
{
// Return null and let caller throw an exception with hostname
return(null);
}
return(encoded);
}
catch (Java.Security.Cert.CertificateException e)
{
Console.WriteLine(TAG + "Unable to generate certificate: " + e.Message);
return(null);
}
}
static Java.Security.Cert.X509Certificate ConvertCertificate(Java.Security.Cert.CertificateFactory factory, byte[] certificateData)
{
return(factory.GenerateCertificate(new System.IO.MemoryStream(certificateData))
.JavaCast <Java.Security.Cert.X509Certificate>() !);
}
