Validate a JWS with a Public Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetPublicKey, which sets the public key used to validate a signature of a loaded JWS.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

integer li_rc
integer li_Success
oleobject loo_Jws
string ls_JwsCompact
oleobject loo_PubKey
integer v

li_Success = 0

loo_Jws = create oleobject
li_rc = loo_Jws.ConnectToNewObject("Chilkat.Jws")
if li_rc < 0 then
    destroy loo_Jws
    MessageBox("Error","Connecting to COM object failed")
    return
end if

//  Load the JWS compact serialization.
ls_JwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
li_Success = loo_Jws.LoadJws(ls_JwsCompact)
if li_Success = 0 then
    Write-Debug loo_Jws.LastErrorText
    destroy loo_Jws
    return
end if

//  The file path is relative to the application's current working directory.  An absolute path
//  may also be used.  Supply the path appropriate to your own environment.
//  Load the signer's public key and set it for validating signature 0.
loo_PubKey = create oleobject
li_rc = loo_PubKey.ConnectToNewObject("Chilkat.PublicKey")

li_Success = loo_PubKey.LoadFromFile("qa_data/signer_pubkey.pem")
if li_Success = 0 then
    Write-Debug loo_PubKey.LastErrorText
    destroy loo_Jws
    destroy loo_PubKey
    return
end if

li_Success = loo_Jws.SetPublicKey(0,loo_PubKey)
if li_Success = 0 then
    Write-Debug loo_Jws.LastErrorText
    destroy loo_Jws
    destroy loo_PubKey
    return
end if

//  Validate the signature.  Validate returns 1 when valid, 0 when not, or a negative value on error.
v = loo_Jws.Validate(0)
if v < 0 then
    Write-Debug loo_Jws.LastErrorText
    destroy loo_Jws
    destroy loo_PubKey
    return
end if

if v <> 1 then
    Write-Debug "The signature is not valid."
    destroy loo_Jws
    destroy loo_PubKey
    return
end if

Write-Debug "The signature is valid."


destroy loo_Jws
destroy loo_PubKey