Ruby

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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Ruby

require 'chilkat'

success = false

jws = Chilkat::CkJws.new()

#  Load the JWS compact serialization.
jwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
success = jws.LoadJws(jwsCompact)
if (success == false)
    print jws.lastErrorText() + "\n";
    exit
end

#  Copy the decoded protected header of signature 0 into a JsonObject.
json = Chilkat::CkJsonObject.new()
success = jws.GetProtectedH(0,json)
if (success == false)
    print jws.lastErrorText() + "\n";
    exit
end

json.put_EmitCompact(false)
print json.emit() + "\n";