Zig

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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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // Load a private key to export.
    const priv_key = try chilkat.PrivateKey.init();
    defer priv_key.deinit();
    priv_key.loadPemFile("qa_data/private.pem") catch {
        std.debug.print("{s}\n", .{try priv_key.getLastErrorText(alloc)});
        return;
    };

    // Export as a compact JWK (JSON Web Key).  Binary values use Base64url without padding.
    const jwk = priv_key.getJwk(alloc) catch {
        std.debug.print("{s}\n", .{try priv_key.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("{s}\n", .{jwk});
}