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JWE using ECDH-ES, BP-256, A256GCM

See more JSON Web Encryption (JWE) Examples

Create a JWE with the following header:

	{
	  "alg": "ECDH-ES",
	  "enc": "A256GCM",
	  "exp": 1621957030,
	  "cty": "NJWT",
	  "epk": {
	    "kty": "EC",
	    "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w"
	    "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
	    "crv": "BP-256"
	  }
	}

Note: This example requires Chilkat v9.5.0.87 or greater.

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Local $bSuccess = False

; This requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

; Load our brainpool BP-256 public key.

; 	{
; 	  "use": "enc",
; 	  "kid": "puk_idp_enc",
; 	  "kty": "EC",
; 	  "crv": "BP-256",
; 	  "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w",
; 	  "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
; 	}

$oJson = ObjCreate("Chilkat.JsonObject")
$oJson.UpdateString("use","enc")
$oJson.UpdateString("kid","puk_idp_enc")
$oJson.UpdateString("kty","EC")
$oJson.UpdateString("crv","BP-256")
$oJson.UpdateString("x","QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w")
$oJson.UpdateString("y","AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu")

$oPubkey = ObjCreate("Chilkat.PublicKey")

$bSuccess = $oPubkey.LoadFromString($oJson.Emit())
If ($bSuccess = False) Then
    ConsoleWrite($oPubkey.LastErrorText & @CRLF)
    Exit
EndIf

; Build our protected header:

; 	{
; 	  "alg": "ECDH-ES",
; 	  "enc": "A256GCM",
; 	  "exp": 1621957030,
; 	  "cty": "NJWT",
; 	  "epk": {
; 	    "kty": "EC",
; 	    "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w"
; 	    "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
; 	    "crv": "BP-256"
; 	  }
; 	}

; Use jwt only for getting the current date/time + 3600 seconds.
$oJwt = ObjCreate("Chilkat.Jwt")

$oJweProtHdr = ObjCreate("Chilkat.JsonObject")
$oJweProtHdr.UpdateString("alg","ECDH-ES")
$oJweProtHdr.UpdateString("enc","A256GCM")
$oJweProtHdr.UpdateInt("exp",$oJwt.GenNumericDate(3600))
$oJweProtHdr.UpdateString("cty","NJWT")
$oJweProtHdr.UpdateString("epk.kty","EC")
$oJweProtHdr.UpdateString("epk.x","QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w")
$oJweProtHdr.UpdateString("epk.y","AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu")
$oJweProtHdr.UpdateString("epk.crv","BP-256")

$oJwe = ObjCreate("Chilkat.Jwe")
$oJwe.SetProtectedHeader($oJweProtHdr)
$oJwe.SetPublicKey(0,$oPubkey)

Local $sPlainText = "This is the text to be encrypted."
Local $strJwe = $oJwe.Encrypt($sPlainText,"utf-8")
If ($oJwe.LastMethodSuccess <> True) Then
    ConsoleWrite($oJwe.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite($strJwe & @CRLF)

ConsoleWrite("Success." & @CRLF)