Set JWE Additional Authenticated Data from BinData

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetAadBd, which sets external Additional Authenticated Data (AAD) to the exact bytes held in a BinData.

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

set jwe = CreateObject("Chilkat.Jwe")

'  Protected header: AES key-wrap with AES-256-GCM content encryption.
set header = CreateObject("Chilkat.JsonObject")
success = header.UpdateString("alg","A256KW")
success = header.UpdateString("enc","A256GCM")
success = jwe.SetProtectedHeader(header)
If (success = 0) Then
    outFile.WriteLine(jwe.LastErrorText)
    WScript.Quit
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
    outFile.WriteLine(jwe.LastErrorText)
    WScript.Quit
End If

'  Set external Additional Authenticated Data (AAD) to the exact bytes in a BinData.  Passing an empty
'  BinData clears any previously configured AAD.
set bdAad = CreateObject("Chilkat.BinData")
success = bdAad.AppendString("context-info-v1","utf-8")
success = jwe.SetAadBd(bdAad)
If (success = 0) Then
    outFile.WriteLine(jwe.LastErrorText)
    WScript.Quit
End If

set sbContent = CreateObject("Chilkat.StringBuilder")
success = sbContent.Append("This is the secret content.")
set sbJwe = CreateObject("Chilkat.StringBuilder")
success = jwe.EncryptSb(sbContent,"utf-8",sbJwe)
If (success = 0) Then
    outFile.WriteLine(jwe.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine(sbJwe.GetAsString())

outFile.Close