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 Long
success = 0

Dim jwe As New ChilkatJwe

'  Protected header: AES key-wrap with AES-256-GCM content encryption.
Dim header As New ChilkatJsonObject
success = header.UpdateString("alg","A256KW")
success = header.UpdateString("enc","A256GCM")
success = jwe.SetProtectedHeader(header)
If (success = 0) Then
    Debug.Print 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
base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jwe.SetWrappingKey(0,base64Key,"base64")
If (success = 0) Then
    Debug.Print 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 ChilkatJsonObject
success = recipHeader.UpdateString("kid","recipient-key-1")
success = jwe.SetRecipientHeader(0,recipHeader)
If (success = 0) Then
    Debug.Print jwe.LastErrorText
    Exit Sub
End If

Dim sbContent As New ChilkatStringBuilder
success = sbContent.Append("This is the secret content.")
Dim sbJwe As New ChilkatStringBuilder
success = jwe.EncryptSb(sbContent,"utf-8",sbJwe)
If (success = 0) Then
    Debug.Print jwe.LastErrorText
    Exit Sub
End If

Debug.Print sbJwe.GetAsString()