Public Key Hash

What we want to convert is the Base64 string in the Modulus node, so the first step is to extract it and then convert it.

        static void Main(string[] args)  
        {  
            using (var provider = new RSACryptoServiceProvider(2048))  
            {  
                //  
                var publicKey = provider.ToXmlString(false);  
                XmlDocument xd = new XmlDocument();  
                xd.LoadXml(publicKey);  
                string base64PK = xd.SelectSingleNode("descendant::Modulus").InnerText;  
  
                byte[] bytes = Convert.FromBase64String(base64PK);  
                string hex = BitConverter.ToString(bytes);  
  
                string hash = ComputeSha256Hash(base64PK);  
                Console.WriteLine();  
            }  
  
  
             
        }  
        static string ComputeSha256Hash(string rawData)  
        {  
            // Create a SHA256     
            using (SHA256 sha256Hash = SHA256.Create())  
            {  
                // ComputeHash - returns byte array    
                byte[] bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(rawData));  
  
                // Convert byte array to a string     
                StringBuilder builder = new StringBuilder();  
                for (int i = 0; i < bytes.Length; i++)  
                {  
                    builder.Append(bytes[i].ToString("X2"));  
                }  
                return builder.ToString();  
            }  
        }  

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