private static async Task CheckSecret(NamedGroup group, byte[] privKey, byte[] peerKey, byte[] publicKey, byte[] secret)
{
using (var bufferPool = new MemoryPool())
{
var options = new PipeOptions(bufferPool);
var pipe = new Pipe(options);
var write = pipe.Writer.Alloc();
write.WriteBigEndian((byte)peerKey.Length);
write.Write(peerKey);
await write.FlushAsync();
var reader = await pipe.Reader.ReadAsync();
var instance = new OpenSsl11.OpenSslFiniteFieldKeyExchange(group);
instance.GenerateKeys(privKey, publicKey);
SetPeerKey(reader, instance);
var buffer = new byte[instance.KeyExchangeSize];
var size = instance.DeriveSecret(buffer);
TestSecret(secret, buffer, size);
}
}
private static void SetPeerKey(ReadResult reader, OpenSsl11.OpenSslFiniteFieldKeyExchange instance) => instance.SetPeerKey(new Internal.BigEndianAdvancingSpan(reader.Buffer.ToSpan()), null, Certificates.SignatureScheme.none);