(VB.NET) 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.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

Dim rsa As New Chilkat.Rsa

' Generate a 2048-bit key.  Chilkat RSA supports
Dim success As Boolean = rsa.GenerateKey(2048)
If (success <> True) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


' Get the public part of the key.
Dim pubKey As Chilkat.PublicKey = 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.
Dim bChoosePkcs1 As Boolean = True
Dim pubKeyBase64Der As String = 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.)
Dim privKey As Chilkat.PrivateKey = rsa.ExportPrivateKeyObj()

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

Dim privKeyPkcs8 As String = privKey.GetPkcs8ENC("base64")
Debug.WriteLine("Private Key PKCS8 Base64 DER:")
Debug.WriteLine(privKeyPkcs8)