Lianja

Get a JWS Protected Header

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.GetProtectedH, which copies the decoded protected header of a signature into a JsonObject.

Background. The protected header is integrity-protected by the signature. Inspecting it (for example the alg value) is useful before deciding how to validate.

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llSuccess = .F.

loJws = createobject("CkJws")

//  Load the JWS compact serialization.
lcJwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
llSuccess = loJws.LoadJws(lcJwsCompact)
if (llSuccess = .F.) then
    ? loJws.LastErrorText
    release loJws
    return
endif

//  Copy the decoded protected header of signature 0 into a JsonObject.
loJson = createobject("CkJsonObject")
llSuccess = loJws.GetProtectedH(0,loJson)
if (llSuccess = .F.) then
    ? loJws.LastErrorText
    release loJws
    release loJson
    return
endif

loJson.EmitCompact = .F.
? loJson.Emit()


release loJws
release loJson