B4X

Export a Private Key as a JWK

Demonstrates the Chilkat PrivateKey.GetJwk method, which exports the key as a compact JWK (JSON Web Key). It takes no arguments; binary values use Base64url without padding.

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 to it lets you publish a key into a JWK Set or hand it to a web framework that speaks JWK. Note this is the private JWK: it includes the private parameters (d and, for RSA, the CRT values), so it is highly sensitive — publish only the public JWK derived from ToPublicKey when sharing.

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Dim success As Boolean = False

'  Load a private key to export.
Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")
success = privKey.LoadPemFile("qa_data/private.pem")
If success = False Then
    Log(privKey.LastErrorText)
    Return
End If


'  Export as a compact JWK (JSON Web Key).  Binary values use Base64url without padding.
Dim jwk As String = privKey.GetJwk
If privKey.LastMethodSuccess = False Then
    Log(privKey.LastErrorText)
    Return
End If

Log(jwk)