(.NET Core C#) Generate an RSA Key and Get as Base64 DER

Demonstrates how to generate a 2048-bit RSA key and return the public and private parts as unencrypted Base64 encoded DER.

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// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Rsa rsa = new Chilkat.Rsa();

// Generate a 2048-bit key.  Chilkat RSA supports
bool success = rsa.GenerateKey(2048);
if (success != true) {
    Debug.WriteLine(rsa.LastErrorText);
    return;
}

// Get the public part of the key.
Chilkat.PublicKey pubKey = rsa.ExportPublicKeyObj();

// There are two possible formats for representing the RSA public key 
// in ASN.1 (DER).  The possible formats are PKCS1 and PKCS8.
// We can get either by setting bChoosePkcs1 to true or false.
bool bChoosePkcs1 = true;
string pubKeyBase64Der = pubKey.GetEncoded(bChoosePkcs1,"base64");
Debug.WriteLine("Public Key Base64 DER:");
Debug.WriteLine(pubKeyBase64Der);

// Now get the private key as Base64 DER:
// Get the private part of the key.
// (Note: A public key is actually just a subset of the private key.  
//  If you have the private key, you also have the public key.
//  Thus Chilkat provides a method to get the public key from the private key.)
Chilkat.PrivateKey privKey = rsa.ExportPrivateKeyObj();

// Again, we can get PKCS1 or PKCS8, but with different methods:
string privKeyPkcs1 = privKey.GetPkcs1ENC("base64");
Debug.WriteLine("Private Key PKCS1 Base64 DER:");
Debug.WriteLine(privKeyPkcs1);

string privKeyPkcs8 = privKey.GetPkcs8ENC("base64");
Debug.WriteLine("Private Key PKCS8 Base64 DER:");
Debug.WriteLine(privKeyPkcs8);