Процесс верификации сертификата цифровой подписи с помощью pdf-файла ASP.NET и с#

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Привет Разработчикам
как сгенерировать сертификат цифровой подписи, а также проверить открытый и закрытый ключи с помощью C# any one know share me.
Надеюсь, с Savadamuthu сараванан.

Что я уже пробовал:

 class X509CertTest

    {

        static void Main(string[] args)

        {

            string messageToFatima = "My personal data";
//13
​
//14
            //retrieve certificate from store//
//15
            X509Certificate2 certificate = GetCertFromStore();
//16
​
//17
            //**signing data**//
//18
            

            byte[] hashBytes = GetDataHash(messageToFatima);
        byte[] signature= GetDigitalSignature(hashBytes);
//24
           bool isVerified = VerifyData(signature, messageToFatima);
//25
​
//26
            Console.WriteLine("IsVerified: {isVerified}");
​

            Console.ReadLine();
        }
    private static bool VerifyData(byte[] signature, string messageFromAhemd)

        {
//33
            var messageHash = GetDataHash(messageFromAhemd);
//34
​
//35
            X509Certificate2 certificate = GetCertFromStore();

            RSACryptoServiceProvider cryptoServiceProvider=(RSACryptoServiceProvider)certificate.PublicKey.Key;

            return cryptoServiceProvider.VerifyHash(messageHash, CryptoConfig.MapNameToOID("SHA1"), signature);

        }

        private static byte[] GetDigitalSignature(byte[] hashBytes)

        {

            X509Certificate2 certificate = GetCertFromStore();

            /*use any asymmetric crypto service provider for encryption of hash
46
              with private key of cert.
47
             */

            RSACryptoServiceProvider rsaCryptoService = (RSACryptoServiceProvider) certificate.PrivateKey;

            /*now lets sign the hash
51
              1.spevify hash bytes
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              2. and hash algorithm name to obtain the bytes
53
             */
//54
            return rsaCryptoService.SignHash(hashBytes,CryptoConfig.MapNameToOID("SHA1") );
        }
        private static byte[] GetDataHash(string sampleData)
        {
           SHA1Managed managedHash=new SHA1Managed();

            return managedHash.ComputeHash(Encoding.Unicode.GetBytes(sampleData));

        }

        private static X509Certificate2 GetCertFromStore()

        {

            //to access to store we need to specify store name and location

            X509Store x509Store = new X509Store("sampleCertStore",StoreLocation.CurrentUser);
         //obtain read only access to get cert
//71
            x509Store.Open(OpenFlags.ReadOnly);
//72
​
//73
            return x509Store.Certificates[1]; 
            
        }
    }

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