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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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Local $bSuccess = False

$oJwe = ObjCreate("Chilkat.Jwe")

;  Set the JWE protected header, specifying the key-management algorithm (alg) and the content-
;  encryption algorithm (enc).
$oHeader = ObjCreate("Chilkat.JsonObject")
$oHeader.UpdateString("alg","A256KW")
$oHeader.UpdateString("enc","A256GCM")
$bSuccess = $oJwe.SetProtectedHeader($oHeader)
If ($bSuccess = False) Then
    ConsoleWrite($oJwe.LastErrorText & @CRLF)
    Exit
EndIf

;  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.
Local $sBase64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
$bSuccess = $oJwe.SetWrappingKey(0,$sBase64Key,"base64")
If ($bSuccess = False) Then
    ConsoleWrite($oJwe.LastErrorText & @CRLF)
    Exit
EndIf

;  Encrypt content supplied in a StringBuilder, writing the resulting JWE into another StringBuilder.
$oSbContent = ObjCreate("Chilkat.StringBuilder")
$oSbContent.Append("This is the secret content.")

$oSbJwe = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oJwe.EncryptSb($oSbContent,"utf-8",$oSbJwe)
If ($bSuccess = False) Then
    ConsoleWrite($oJwe.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite($oSbJwe.GetAsString() & @CRLF)