(Classic ASP) 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 ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

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

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Rsa")
set rsa = Server.CreateObject("Chilkat.Rsa")

' Generate a 2048-bit key.  Chilkat RSA supports
success = rsa.GenerateKey(2048)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( rsa.LastErrorText) & "</pre>"
    Response.End
End If

' Get the public part of the key.
' pubKey is a Chilkat.PublicKey
Set 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 1 or 0.
bChoosePkcs1 = 1
pubKeyBase64Der = pubKey.GetEncoded(bChoosePkcs1,"base64")
Response.Write "<pre>" & Server.HTMLEncode( "Public Key Base64 DER:") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( pubKeyBase64Der) & "</pre>"

' 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.)
' privKey is a Chilkat.PrivateKey
Set privKey = rsa.ExportPrivateKeyObj()

' Again, we can get PKCS1 or PKCS8, but with different methods:
privKeyPkcs1 = privKey.GetPkcs1ENC("base64")
Response.Write "<pre>" & Server.HTMLEncode( "Private Key PKCS1 Base64 DER:") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( privKeyPkcs1) & "</pre>"

privKeyPkcs8 = privKey.GetPkcs8ENC("base64")
Response.Write "<pre>" & Server.HTMLEncode( "Private Key PKCS8 Base64 DER:") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( privKeyPkcs8) & "</pre>"


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