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 ChilkatJwe
jwe.Initialize

'  Protected header: AES key-wrap with AES-256-GCM content encryption.
Dim header As ChilkatJsonObject
header.Initialize
header.UpdateString("alg", "A256KW")
header.UpdateString("enc", "A256GCM")
success = jwe.SetProtectedHeader(header)
If success = False Then
    Log(jwe.LastErrorText)
    Return
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
    Log(jwe.LastErrorText)
    Return
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 ChilkatJsonObject
recipHeader.Initialize
recipHeader.UpdateString("kid", "recipient-key-1")
success = jwe.SetRecipientHeader(0, recipHeader)
If success = False Then
    Log(jwe.LastErrorText)
    Return
End If


Dim sbContent As ChilkatStringBuilder
sbContent.Initialize
sbContent.Append("This is the secret content.")
Dim sbJwe As ChilkatStringBuilder
sbJwe.Initialize
success = jwe.EncryptSb(sbContent, "utf-8", sbJwe)
If success = False Then
    Log(jwe.LastErrorText)
    Return
End If

Log(sbJwe.GetAsString)