Set a Per-Recipient JWE Header

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetRecipientHeader, which sets the per-recipient unprotected header for a recipient index.

Dim success As Boolean = False

Dim jwe As New Chilkat.Jwe

'  Protected header: AES key-wrap with AES-256-GCM content encryption.
Dim header As New Chilkat.JsonObject
header.UpdateString("alg","A256KW")
header.UpdateString("enc","A256GCM")
success = jwe.SetProtectedHeader(header)
If (success = False) Then
    Debug.WriteLine(jwe.LastErrorText)
    Exit Sub
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.
Dim base64Key As String = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jwe.SetWrappingKey(0,base64Key,"base64")
If (success = False) Then
    Debug.WriteLine(jwe.LastErrorText)
    Exit Sub
End If


'  Set the per-recipient unprotected header for recipient 0, for example a key id used to identify
'  which key a recipient should use.
Dim recipHeader As New Chilkat.JsonObject
recipHeader.UpdateString("kid","recipient-key-1")
success = jwe.SetRecipientHeader(0,recipHeader)
If (success = False) Then
    Debug.WriteLine(jwe.LastErrorText)
    Exit Sub
End If


Dim sbContent As New Chilkat.StringBuilder
sbContent.Append("This is the secret content.")
Dim sbJwe As New Chilkat.StringBuilder
success = jwe.EncryptSb(sbContent,"utf-8",sbJwe)
If (success = False) Then
    Debug.WriteLine(jwe.LastErrorText)
    Exit Sub
End If

Debug.WriteLine(sbJwe.GetAsString())