Visual FoxPro

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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LOCAL lnSuccess
LOCAL loPubKey
LOCAL lcJwk

lnSuccess = 0

*  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
*  JWK, and other supported representations.
loPubKey = CreateObject('Chilkat.PublicKey')
lnSuccess = loPubKey.LoadFromFile("qa_data/public.pem")
IF (lnSuccess = 0) THEN
    ? loPubKey.LastErrorText
    RELEASE loPubKey
    CANCEL
ENDIF

*  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.
lcJwk = loPubKey.GetJwk()
IF (loPubKey.LastMethodSuccess = 0) THEN
    ? loPubKey.LastErrorText
    RELEASE loPubKey
    CANCEL
ENDIF

? lcJwk

RELEASE loPubKey