public static IEnumerable<string> GetPublicKeysList(IReadOnlyList<Certificate> serverCertificates)
        {
            for (var i = 0; i < serverCertificates.Count; i++)
            {
                string publicKey = null;
                try
                {
                    var certificate = new X509Certificate2(serverCertificates[0].GetCertificateBlob().ToArray());
                    var ms = new MemoryStream(certificate.RawData);
                    using (var reader = new BerReader(ms))
                    {
                        var asnCert = reader.ReadToEnd(true);
                        var pkNode = asnCert.ChildNodes[0].ChildNodes[0].ChildNodes[6]; // тут лежит сам ключ
                        byte[] pkBuffer = new byte[pkNode.Length + (pkNode.DataOffsetToStream - pkNode.StartPosition)];
                        ms.Seek(pkNode.StartPosition, SeekOrigin.Begin);
                        ms.Read(pkBuffer, 0, pkNode.Length + (int)(pkNode.DataOffsetToStream - pkNode.StartPosition)); // чтобы не потерять последние 4 байта
                        publicKey = Convert.ToBase64String(pkBuffer);
                    }
                }
                catch (Exception ex)
                {
                    throw new SecurityException($"Cant get public key {ex.Message}");
                }
                yield return publicKey;
            }
        }