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Load ECC Private Key from JWK Format (JSON Web Key)

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Demonstrates how to load an ECC private key from JWK (JSON Web Key) format.

Note: This example requires Chilkat v9.5.0.66 or later.

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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();

    // Note: This example requires Chilkat v9.5.0.66 or later.

    // First build a JWK sample to load..
    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.updateString("kty", "EC") catch {};
    json.updateString("crv", "P-256") catch {};
    json.updateString("x", "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE") catch {};
    json.updateString("y", "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU") catch {};
    json.updateString("d", "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM") catch {};

    // The JSON contains the following:
    // {
    //   "kty": "EC",
    //   "crv": "P-256",
    //   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
    //   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
    //   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
    // }

    // Note: The JSON can contain other members, such as "use", "kid", or anything else.  These will be ignored.
    json.setEmitCompact(false);

    // Show the JWK string to be loaded:
    const jwk_str = try json.emit(alloc);

    const priv_key = try chilkat.PrivateKey.init();
    defer priv_key.deinit();
    priv_key.loadJwk(jwk_str) catch {
        std.debug.print("{s}\n", .{try priv_key.getLastErrorText(alloc)});
        return;
    };

    // OK.. the JWK is loaded.  It can be used in whatever way desired...

    // The key can be retrieved in any other format, such as XML or PEM..
    std.debug.print("{s}\n", .{try priv_key.getXml(alloc)});

    // XML output:
    // <ECCKeyValue curve="secp256r1">MHcCAQEEIBG1c3z52T8XwMsahGVdOZWgKCQJfv+l7djuJjgetdbDoAoGCCqGSM49AwEHoEQDQgAEoBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxG+9DLFmRSMlBQ9T/RsLLc+PmpB1+7yPAR+oR5gZn3kJQ==</ECCKeyValue>

    std.debug.print("{s}\n", .{try priv_key.getPkcs8EncryptedPem(alloc, "secret")});

    // PEM output
    //
    // -----BEGIN ENCRYPTED PRIVATE KEY-----
    // MIHFMEAGCSqGSIb3DQEFDTAzMBsGCSqGSIb3DQEFDDAOBAiku9rUjavLQQICCAAw
    // FAYIKoZIhvcNAwcECGsl/5nLai+JBIGAVIqKAdfcRQNLl1t3x+n8OZ92d1H+qgjS
    // Hs83wn2joJK4nlqy+rzosZxQ3e8NTJQyUEWZWcjqMj/N0phS3QWtcD/qbda5oEcv
    // QgtU60cZ4ql3truefAmlZz2PdpOfqtYhxlvjJQxnyojn4ntj69OwLOt9SZbaBQQi
    // KUL8KXT4Pq8=
    // -----END ENCRYPTED PRIVATE KEY-----
}