Use RSAPKCS1SignatureFormatter to create a digital signature and then uses the RSAPKCS1SignatureDeformatter class to verify the signature. : RSA « Security « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Security
3. RSA

using System;
using System.Security.Cryptography;

class RSASample
{
        
    static void Main()
    {
        try
        {
            RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
            byte[] Hash = {59,4,248,102,77,97,142,201,210,12,224,93,25,41,100,197,213,134,130,135};

            RSAPKCS1SignatureFormatter RSAFormatter = new RSAPKCS1SignatureFormatter(RSA);

            RSAFormatter.SetHashAlgorithm("SHA1");

            byte[] SignedHash = RSAFormatter.CreateSignature(Hash);

            RSAPKCS1SignatureDeformatter RSADeformatter = new RSAPKCS1SignatureDeformatter(RSA);

            RSADeformatter.SetHashAlgorithm("SHA1");

            Console.WriteLine(RSADeformatter.VerifySignature(Hash, SignedHash));


        }
        catch(CryptographicException e)
        {
            Console.WriteLine(e.Message);
        }
    }

}