Compute WebSocket Hash

gistfile1.cs

public String ComputeWebSocketHandshakeSecurityHash09(String secWebSocketKey)
{
    const String MagicKEY = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
    String secWebSocketAccept = String.Empty;

    // 1. Combine the request Sec-WebSocket-Key with magic key.
    String ret = secWebSocketKey + MagicKEY;

    // 2. Compute the SHA1 hash
    SHA1 sha = new SHA1CryptoServiceProvider();
    byte[] sha1Hash = sha.ComputeHash(Encoding.UTF8.GetBytes(ret));

    // 3. Base64 encode the hash
    secWebSocketAccept = Convert.ToBase64String(sha1Hash);

    return secWebSocketAccept;
}