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Load a Private Key from a JWK

Demonstrates the Chilkat PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key) JSON. The only argument is the JWK JSON string. Supported key types are RSA, EC, and Ed25519 (kty=OKP).

Background: JWK is the JSON key format used throughout modern web security — JWT signing, OAuth, OpenID Connect — so this loader is what you use to consume a key from a JWK Set or an identity provider. A private JWK includes the private parameters (d and, for RSA, the CRT values); a public-only JWK omits them. As JSON in the clear, a private JWK must be handled as sensitive material.

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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();

    // Demonstrates the PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key)
    // JSON.  The only argument is the JWK JSON string.  Supported key types are RSA, EC, and
    // Ed25519 (kty=OKP).

    const priv_key = try chilkat.PrivateKey.init();
    defer priv_key.deinit();

    // A private JWK.  For a real key, "d" (and the other private parameters) would be present.
    const jwk = "{\"kty\":\"EC\",\"crv\":\"P-256\",\"x\":\"...\",\"y\":\"...\",\"d\":\"...\"}";

    priv_key.loadJwk(jwk) catch {
        std.debug.print("{s}\n", .{try priv_key.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Loaded a {s} private key.\n", .{try priv_key.getKeyType(alloc)});
}