(Classic ASP) Get ECC Private Key in JWK Format (JSON Web Key)

Demonstrates how to get an ECC private key in JWK (JSON Web Key) format.

Note: This example requires Chilkat v9.5.0.66 or later.

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
' Note: This example requires Chilkat v9.5.0.66 or later.

' Load a PEM file into memory.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbPem = Server.CreateObject("Chilkat.StringBuilder")
success = sbPem.LoadFile("qa_data/pem/ecc_privKey.pem","utf-8")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to load PEM file.") & "</pre>"
    Response.End
End If

' Load the PEM into a private key object.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.PrivateKey")
set privKey = Server.CreateObject("Chilkat.PrivateKey")
success = privKey.LoadPem(sbPem.GetAsString())
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( privKey.LastErrorText) & "</pre>"
    Response.End
End If

' Get the private key in JWK format:
jwk = privKey.GetJwk()

' The GetJwk method will return the JWK in the most compact JSON format possible,
' as a single line with no extra whitespace.  To get a more human-readable JWK (for this example),
' load into a Chilkat JSON object and emit non-compact:

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set json = Server.CreateObject("Chilkat.JsonObject")
success = json.Load(jwk)
json.EmitCompact = 0
Response.Write "<pre>" & Server.HTMLEncode( "ECC Private Key in JWK format:") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( json.Emit()) & "</pre>"

' Sample output:
' { 
'   "kty": "EC",
'   "crv": "P-256",
'   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
'   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
'   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
' }
' 

' Additional information can be added like this:
success = json.AppendString("use","enc")
success = json.AppendString("kid","123ABC")

' Now examine the JSON:
Response.Write "<pre>" & Server.HTMLEncode( json.Emit()) & "</pre>"

' { 
'   "kty": "EC",
'   "crv": "P-256",
'   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
'   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
'   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM",
'   "use": "enc",
'   "kid": "123ABC"
' }

%>
</body>
</html>