private static void SendPublicKey(X509Certificate2 cert)
{
var certBytes = cert.Export(X509ContentType.Cert);
byte[] asn1PubKey = Asn1Formatter.SetCertASN1(certBytes);
socket.Send(asn1PubKey);
}
private static void SendCertificatesList()
{
var certs = crypter.Certificates;
byte[] data = Asn1Formatter.SetCertListASN1(certs);
socket.Send(data);
}
static void Main(string[] args)
{
try
{
socket.Init();
while (true)
{
byte[] data = socket.Recieve();
BERelement asn = BERelement.DecodePacket(data);
int operation;
if (asn.Items[0].Value.Length > 1)
{
operation = BitConverter.ToInt32(asn.Items[0].Value, 0);
}
else
{
operation = asn.Items[0].Value[0];
}
switch (operation)
{
case (int)Cmd.certs:
SendCertificatesList();
break;
case (int)Cmd.cipher:
SendCertificatesList();
data = socket.Recieve();
asn = BERelement.DecodePacket(data);
string certName = Encoding.ASCII.GetString(asn.Items[0].Value);
foreach (var cert in crypter.Certificates)
{
if (cert.FriendlyName == certName)
{
crypter.currentCertificate = cert;
SendPublicKey(cert);
break;
}
}
data = socket.Recieve();
crypter.SetSymmetrKey(Asn1Formatter.GetSymAsn1(data));
crypter.IV = Asn1Formatter.GetIVAsn1(data);
byte[] asn1Established = Asn1Formatter.SetCertASN1(Encoding.ASCII.GetBytes("ESTABLISHED"));
socket.Send(asn1Established);
data = socket.Recieve();
String text = Encoding.ASCII.GetString(crypter.Decrypt(data));
Console.WriteLine("Recieved data from client: " + text);
break;
case (int)Cmd.sign:
asn1Established = Asn1Formatter.SetCertASN1(Encoding.ASCII.GetBytes("ESTABLISHED"));
socket.Send(asn1Established);
data = socket.Recieve();
asn = BERelement.DecodePacket(data);
try
{
if (asn.Items[0].Value.Length > 1)
{
operation = BitConverter.ToInt32(asn.Items[0].Value, 0);
}
else
{
operation = asn.Items[0].Value[0];
}
if (operation == (int)Cmd.error)
{
Console.WriteLine("Error!");
continue;
}
}
catch (NotSupportedException)
{
Console.WriteLine("Signed message came!");
}
BERelement mSeq = BERelement.DecodePacket(data);
BERelement sSeq = mSeq.Items[0];
BERelement fSeq = mSeq.Items[1];
var signature = sSeq.Items[0].Value;
var certS = new X509Certificate2(sSeq.Items[1].Value);
var time = DateTime.FromBinary(BitConverter.ToInt64(sSeq.Items[2].Value, 0));
var sData = fSeq.Items[0].Value;
Gost3410_2012_256CryptoServiceProvider sGost = (Gost3410_2012_256CryptoServiceProvider)certS.PublicKey.Key;
Gost3411CryptoServiceProvider hGost = new Gost3411CryptoServiceProvider();
bool correct = sGost.VerifySignature(hGost.ComputeHash(sData), signature);
Console.WriteLine($"Friendly name: {certS.FriendlyName}");
Console.WriteLine(certS + "\n");
Console.WriteLine("Signature time...");
Console.WriteLine(time + "\n");
Console.WriteLine("Correct signature?...");
Console.WriteLine(correct + "\n");
Console.WriteLine("Data:");
Console.WriteLine(Encoding.ASCII.GetString(sData) + "\n");
break;
default:
break;
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}