private unsafe void CreateAuthentication(ApplicationProtocols.ProtocolIds alpnSupportedProtocols)
{
int numberOfPackages;
SecPkgInfo *secPointer = null;
if (alpnSupportedProtocols > 0)
{
_alpnSupportedProtocols = ApplicationProtocols.GetBufferForProtocolId(alpnSupportedProtocols);
_alpnHandle = GCHandle.Alloc(_alpnSupportedProtocols, GCHandleType.Pinned);
}
try
{
if (InteropSspi.EnumerateSecurityPackagesW(out numberOfPackages, out secPointer) != 0)
{
throw new InvalidOperationException("Unable to enumerate security packages");
}
var size = sizeof(SecPkgInfo);
for (int i = 0; i < numberOfPackages; i++)
{
var package = secPointer[i];
var name = Marshal.PtrToStringUni(package.Name);
if (name == SecurityPackage)
{
_maxTokenSize = package.cbMaxToken;
//The correct security package is available
_initOkay = true;
GetCredentials();
return;
}
}
throw new InvalidOperationException($"Unable to find the security package named {SecurityPackage}");
}
finally
{
if (secPointer != null)
{
InteropSspi.FreeContextBuffer((IntPtr)secPointer);
}
}
}
internal static extern int EnumerateSecurityPackagesW([Out] out int pkgnum, [Out] out SecPkgInfo *info);