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Bouncy Castle is a popular cryptography library in C#. If you want to parse and extract Certificate Signing Request (CSR) extensions using Bouncy Castle, you can follow these steps

Add Bouncy Castle Library

First, make sure you have the Bouncy Castle library added to your project. You can do this via NuGet Package Manager:

Install-Package BouncyCastle

Parse CSR:

Use Bouncy Castle to parse the CSR. The following code demonstrates how to parse a CSR from a PEM-encoded string:

using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.OpenSsl;
using Org.BouncyCastle.X509;
using System;
using System.IO;

class Program
{
    static void Main()
    {
        string csrString = File.ReadAllText("path/to/your/csr.pem");

        Pkcs10CertificationRequest csr = ParseCSR(csrString);

        // Now you can work with the parsed CSR
    }

    static Pkcs10CertificationRequest ParseCSR(string csrString)
    {
        PemReader pemReader = new PemReader(new StringReader(csrString));
        object pemObject = pemReader.ReadObject();

        if (pemObject is Pkcs10CertificationRequest csr)
        {
            return csr;
        }

        throw new InvalidOperationException("Invalid CSR format");
    }
}

Extract Extensions:

Once you have the CSR parsed, you can extract extensions using the GetAttributes method. Extensions in a CSR are typically stored in the Attributes property. Here's an example:

foreach (DerObjectIdentifier oid in csr.CertificationRequestInfo.Attributes.GetOids())
{
    Attribute attribute = csr.CertificationRequestInfo.Attributes[oid];

    // Work with the attribute, e.g., check if it's an extension
    if (oid.Equals(PkcsObjectIdentifiers.Pkcs9AtExtensionRequest))
    {
        X509Extensions extensions = X509Extensions.GetInstance(attribute.AttrValues[0]);

        // Now you can iterate over extensions and extract the information you need
        foreach (DerObjectIdentifier extOID in extensions.ExtensionOids)
        {
            X509Extension extension = extensions.GetExtension(extOID);
            // Process the extension
        }
    }
}

Modify the code according to your specific requirements and the structure of your CSR. The example assumes a basic structure, and you may need to adapt it based on your CSR format and the extensions you're interested in.

UDP (User Datagram Protocol) is a transport layer protocol that provides a simple and fast way to send data over a network. Unlike TCP, UDP does not establish a connection between the sender and receiver before sending data. Instead, UDP uses a connectionless communication model, where each datagram (data packet) is sent independently.

Here's how UDP works:

1. The sender application prepares the data to be sent and wraps it in a UDP datagram. This datagram contains the data, the source IP address, the destination IP address, and a checksum for error detection.

2. The sender application sends the UDP datagram to the network layer, which then forwards it to the appropriate network interface for transmission.

3. The datagram is transmitted over the network as a single, self-contained packet. There is no guarantee that the datagram will reach its destination, as UDP does not provide any error correction or retransmission mechanisms.

4. The receiving application listens for incoming UDP datagrams on a specific port. When a datagram arrives, the network layer forwards it to the appropriate application.

5. The receiving application processes the datagram, extracts the data, and handles any errors detected by the checksum.

It's important to note that UDP does not establish a connection between the sender and receiver. This means that there is no handshake or acknowledgment of receipt, and the sender does not know if the datagram was successfully delivered. UDP is often used for applications that prioritize speed over reliability, such as video streaming, online gaming, and VoIP (Voice over Internet Protocol).

Each option has its own advantages and disadvantages. HTTP is faster because it supports caching. And SOCKS provides better anonymity because it hides the headers of requested pages.

In the messenger settings, go to "Data and storage" and then, in the "Proxy settings" section, click "Add proxy". You can see whether a proxy is connected in Telegram by the presence of the shield icon located in the top menu bar.

Go to "Control Panel" and in "Small icons" mode, find the item "Browser properties", aka "Internet Options". In the "Connection" tab, click on "Network Settings", and then leave the item "Automatic detection of parameters" enabled in the window that opens, and disable everything else.