(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.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<body>
<%
success = 0

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

set rsa = Server.CreateObject("Chilkat.Rsa")

' Generate a 2048-bit key.
set privKey = Server.CreateObject("Chilkat.PrivateKey")
success = rsa.GenKey(2048,privKey)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( rsa.LastErrorText) & "</pre>"
    Response.End
End If

' Get the public part of the key.
set pubKey = Server.CreateObject("Chilkat.PublicKey")
success = privKey.ToPublicKey(pubKey)

' 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>"

' Get the private key as Base64 DER:
' 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>"

%>
</body>
</html>