Classic ASP

How to Parse a X.509 Certificate and Extract its Public Key

See more Certificates Examples

Demonstrates how to load an X.509 certificate and extract the public key. Chilkat supports many certificate encodings:

• DER (binary) encoded certificates (.crt/.cer)
• PEM (BASE64) encoded certificates (.pem)
• Load Certificates Directly from Windows Certificate Stores
• PFX/PKCS12 (.pfx/.p12)
• Java KeyStore (.jks)
• Cryptographic Message Syntax Standard - PKCS #7 Certificates (.P7B)

Classic ASP

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

set cert = Server.CreateObject("Chilkat.Cert")

'  Load a DER (binary) encoded certificate.
'  To load from a .pem or .p7b, or any other file format that contains
'  just one certificate, call LoadFromFile in exactly the same way.
'  The LoadFromFile method automatically detects the format and loads the certificate.
success = cert.LoadFromFile("qa_data/certs/testCert.cer")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>"
    Response.End
End If

'  Get the public key:
set pubKey = Server.CreateObject("Chilkat.PublicKey")
success = cert.GetPublicKey(pubKey)

'  Examine the key type.
'  A PublicKey object can contain an RSA, ECC, or DSA public key.
'  The KeyType property will contain "rsa", "ecc", or "dsa".
Response.Write "<pre>" & Server.HTMLEncode( "key type = " & pubKey.KeyType) & "</pre>"

%>
</body>
</html>