Visual Basic 6.0

Export a Public Key as a JWK

Demonstrates the Chilkat PublicKey.GetJwk method, which returns the public key as a compact JWK (JSON Web Key). It takes no arguments; binary values use Base64url without padding and the member order is stable across calls.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: JWK is the JSON key format used across modern web security — JWT, OAuth, OpenID Connect. Exporting a public key to JWK is exactly what you do to publish it in a JWK Set (a jwks_uri endpoint) so others can verify your signatures. The stable member order matters because it makes the output reproducible, which is important when the JWK feeds into a thumbprint.

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Visual Basic 6.0

Dim success As Long
success = 0

'  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
'  JWK, and other supported representations.
Dim pubKey As New PublicKey
success = pubKey.LoadFromFile("qa_data/public.pem")
If (success = 0) Then
    Debug.Print pubKey.LastErrorText
    Exit Sub
End If

'  Export the public key as a compact JWK (JSON Web Key).  Binary values use Base64url without
'  padding, and the member order is stable across calls.
Dim jwk As String
jwk = pubKey.GetJwk()
If (pubKey.LastMethodSuccess = 0) Then
    Debug.Print pubKey.LastErrorText
    Exit Sub
End If

Debug.Print jwk