C++

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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C++

#include <CkPrivateKey.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Load a private key to export.
    CkPrivateKey privKey;
    success = privKey.LoadPemFile("qa_data/private.pem");
    if (success == false) {
        std::cout << privKey.lastErrorText() << "\r\n";
        return;
    }

    //  Export as a compact JWK (JSON Web Key).  Binary values use Base64url without padding.
    const char *jwk = privKey.getJwk();
    if (privKey.get_LastMethodSuccess() == false) {
        std::cout << privKey.lastErrorText() << "\r\n";
        return;
    }

    std::cout << jwk << "\r\n";
    }