Set the Shared JWE Unprotected Header

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetUnprotectedHeader, which sets the shared JWE unprotected header from a JsonObject.

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

$jwe = New-Object Chilkat.Jwe

#  Protected header: AES key-wrap with AES-256-GCM content encryption.
$header = New-Object Chilkat.JsonObject
$header.UpdateString("alg","A256KW")
$header.UpdateString("enc","A256GCM")
$success = $jwe.SetProtectedHeader($header)
if ($success -eq $false) {
    $($jwe.LastErrorText)
    exit
}

#  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 -eq $false) {
    $($jwe.LastErrorText)
    exit
}

#  Set the shared JWE unprotected header.  It is shared by all recipients but, unlike the protected
#  header, is not integrity-protected.
$unprotected = New-Object Chilkat.JsonObject
$unprotected.UpdateString("cty","text/plain")
$success = $jwe.SetUnprotectedHeader($unprotected)
if ($success -eq $false) {
    $($jwe.LastErrorText)
    exit
}

$sbContent = New-Object Chilkat.StringBuilder
$sbContent.Append("This is the secret content.")
$sbJwe = New-Object Chilkat.StringBuilder
$success = $jwe.EncryptSb($sbContent,"utf-8",$sbJwe)
if ($success -eq $false) {
    $($jwe.LastErrorText)
    exit
}

$($sbJwe.GetAsString())