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Encrypt StringBuilder Content to a JWE

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.EncryptSb, which encrypts content supplied in a StringBuilder and writes the resulting JWE into another StringBuilder.

Background. JWE (JSON Web Encryption) protects content with a content-encryption algorithm (the header enc value) while the content-encryption key is managed by the key-management algorithm (the header alg value). This example uses AES key wrapping with a symmetric wrapping key.

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

$success = $false

$jwe = New-Object Chilkat.Jwe

#  Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
#  encryption algorithm (enc).
$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
}

#  Encrypt content supplied in a StringBuilder, writing the resulting JWE into another StringBuilder.
$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())