Zig

Load EC Public Key from X,Y Values

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Demonstrates how to load an EC public key from X and Y values. Zig

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

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

    // We have the following x and y values in base64 (for an EC point on the P-256 curve).
    const x = "Dn7uB1O7kgk74G6qfQwFJESeDnxO6lLjGZFWZJE16tw";
    const y = "iOWA5DInzK6nuUGvHJbMVq1Dpj248FqSV2teN3HzmhU";

    // Build a JWK that looks like this:

    // {
    //   "kty": "EC",
    //   "crv": "P-256",
    //   "x": "Dn7uB1O7kgk74G6qfQwFJESeDnxO6lLjGZFWZJE16tw",
    //   "y": "iOWA5DInzK6nuUGvHJbMVq1Dpj248FqSV2teN3HzmhU"
    // }

    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.updateString("kty", "EC") catch {};
    json.updateString("crv", "P-256") catch {};
    json.updateString("x", x) catch {};
    json.updateString("y", y) catch {};

    // Load from the JWK.
    const pubkey = try chilkat.PublicKey.init();
    defer pubkey.deinit();
    pubkey.loadFromString(try json.emit(alloc)) catch {
        std.debug.print("{s}\n", .{try pubkey.getLastErrorText(alloc)});
        return;
    };

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