Classic ASP

Export a Public Key as DER into a BinData

Demonstrates the Chilkat PublicKey.GetDerBd method, which writes the public key as binary DER into a BinData. The first argument selects the representation (as for GetPem) and the second is the BinData that receives the bytes (its contents are replaced).

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: The in-memory binary export: the raw DER lands in a BinData ready to hash, transmit, or hand to another API without a temporary file. It is the BinData counterpart to the text exporters, and the first argument picks the same PKCS #1 versus SubjectPublicKeyInfo structure.

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Classic ASP

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

'  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
'  JWK, and other supported representations.
set pubKey = Server.CreateObject("Chilkat.PublicKey")
success = pubKey.LoadFromFile("qa_data/public.pem")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( pubKey.LastErrorText) & "</pre>"
    Response.End
End If

'  Write the public key as binary DER into a BinData.  The 1st argument selects the representation
'  (as for GetPem) and the 2nd is the BinData that receives the bytes (its contents are replaced).
preferPkcs1 = 0
set bd = Server.CreateObject("Chilkat.BinData")
success = pubKey.GetDerBd(preferPkcs1,bd)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( pubKey.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "Exported " & bd.NumBytes & " DER bytes.") & "</pre>"

%>
</body>
</html>