Classic ASP

Set JWE Additional Authenticated Data

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetAad, which sets external Additional Authenticated Data (AAD) for a JWE being encrypted, encoding the supplied text with the given charset.

Background. AAD is integrity-protected but not encrypted, binding external context to the ciphertext. The same AAD must be supplied again when decrypting.

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Classic ASP

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

set jwe = Server.CreateObject("Chilkat.Jwe")

'  Protected header: AES key-wrap with AES-256-GCM content encryption.
set header = Server.CreateObject("Chilkat.JsonObject")
success = header.UpdateString("alg","A256KW")
success = header.UpdateString("enc","A256GCM")
success = jwe.SetProtectedHeader(header)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( jwe.LastErrorText) & "</pre>"
    Response.End
End If

'  The 256-bit key-wrapping key (base64) for recipient index 0.  In production, obtain the key from a
'  secure source rather than hard-coding it.
base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jwe.SetWrappingKey(0,base64Key,"base64")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( jwe.LastErrorText) & "</pre>"
    Response.End
End If

'  Set external Additional Authenticated Data (AAD).  The AAD is integrity-protected but not
'  encrypted, and must be supplied again when decrypting.
success = jwe.SetAad("context-info-v1","utf-8")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( jwe.LastErrorText) & "</pre>"
    Response.End
End If

set sbContent = Server.CreateObject("Chilkat.StringBuilder")
success = sbContent.Append("This is the secret content.")
set sbJwe = Server.CreateObject("Chilkat.StringBuilder")
success = jwe.EncryptSb(sbContent,"utf-8",sbJwe)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( jwe.LastErrorText) & "</pre>"
    Response.End
End If

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

%>
</body>
</html>