(Classic ASP) Get ETK Public Key (api-acpt.ehealth.fgov.be)

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The following URL returns JSON, which contains a PKCS7 signed data:

https://api-acpt.ehealth.fgov.be/etee/v1/etks?identifier=12345678901&type=SSIN

This example extracts the signed data, validates it, and then extracts the public key from the certificate (obtained from signed content in the PKCS7)

Note: The URL above uses "12345678901" which is not valid. You should replace it with a valid number.

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">
</head>
<body>
<%
success = 0

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

set http = Server.CreateObject("Chilkat.Http")

jsonStr = http.QuickGetStr("https://api-acpt.ehealth.fgov.be/etee/v1/etks?identifier=12345678901&type=SSIN")
If (http.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( http.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( jsonStr) & "</pre>"

' The JSON contains something like this:

' [
'     {
'         "key": {
'             "applicationIdentifier": "",
'             "ssin": "12345678901"
'         },
'         "value": "MIAGCSq....AAAAAAAA=="
'     }
' ]

' Note: The above is a JSON array (not a JSON object)
' It should be loaded into a Chilkat JSON array.
set jarr = Server.CreateObject("Chilkat.JsonArray")
success = jarr.Load(jsonStr)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to load JSON.") & "</pre>"
    Response.End
End If

' json is a Chilkat.JsonObject
Set json = jarr.ObjectAt(0)
set bdPkcs7 = Server.CreateObject("Chilkat.BinData")
success = bdPkcs7.AppendEncoded(json.StringOf("value"),"base64")

' Let's verify the PKCS7, and then examine the signing cert,
' and get the signing cert's public key.
set crypt = Server.CreateObject("Chilkat.Crypt2")

' Validate the signedData PKCS7, and replace the contents of bdPkcs7 with the extracted signed content.
success = crypt.OpaqueVerifyBd(bdPkcs7)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>"
    Response.End
End If

' The signed content is the DER of a certificate.
' In other words, bdPkcs7 now contains a certificate.
set cert = Server.CreateObject("Chilkat.Cert")
success = cert.LoadFromBd(bdPkcs7)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>"
    Response.End
End If

' Show some certificate information:
Response.Write "<pre>" & Server.HTMLEncode( "Subject: " & cert.SubjectDN) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "Serial: " & cert.SerialNumber) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "Issuer: " & cert.IssuerDN) & "</pre>"

' Let's get the cert's public key...
set pubKey = Server.CreateObject("Chilkat.PublicKey")
success = cert.GetPublicKey(pubKey)

' OK, you now have the public key and can do whatever is needed..
Response.Write "<pre>" & Server.HTMLEncode( pubKey.KeyType) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( pubKey.KeySize) & "</pre>"

%>
</body>
</html>