Zig

Create JWT Using Ed25519 Private Key (EdDSA)

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using an Ed25519 private key. If the private key is Ed25519, which is an EdDSA algorithm, the JOSE header's "alg" member should be set to "EdDSA".

Note: This example requires Chilkat v9.5.0.95 or greater.

Zig

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

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

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Demonstrates how to create a JWT using an Ed25519 private key.

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

    // Load an Ed25519 (EdDSA) private key from a PEM file.
    priv_key.loadPemFile("qa_data/eddsa/ed25519.pem") catch {
        std.debug.print("{s}\n", .{try priv_key.getLastErrorText(alloc)});
        return;
    };

    const jwt = try chilkat.Jwt.init();
    defer jwt.deinit();

    // Build the JOSE header
    const jose = try chilkat.JsonObject.init();
    defer jose.deinit();

    // -----------------------------------------------------------------
    // Note: This example requires Chilkat v9.5.0.95 or greater.
    // -----------------------------------------------------------------
    try jose.appendString("alg", "EdDSA");
    try jose.appendString("typ", "JWT");

    // Now build the JWT claims (also known as the payload)
    const claims = try chilkat.JsonObject.init();
    defer claims.deinit();
    try claims.appendString("iss", "http://example.org");
    try claims.appendString("sub", "John");
    try claims.appendString("aud", "http://example.com");

    // (optional) Set the timestamp of when the JWT was created to now.
    const cur_date_time = jwt.genNumericDate(0);
    try claims.addIntAt(-1, "iat", cur_date_time);

    // (optional)  Set the "not process before" timestamp to now.
    try claims.addIntAt(-1, "nbf", cur_date_time);

    // (optional)  Set the timestamp defining an expiration time (end time) for the token
    // to be now + 1 hour (3600 seconds)
    try claims.addIntAt(-1, "exp", cur_date_time + 3600);

    // Produce the smallest possible JWT:
    jwt.setAutoCompact(true);

    // Create the JWT token.
    const token = try jwt.createJwtPk(alloc, try jose.emit(alloc), try claims.emit(alloc), priv_key);

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

    // Example output:
    // eyJhbGciOiJFZERTQSIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNjg3OTcwNjgyLCJuYmYiOjE2ODc5NzA2ODIsImV4cCI6MTY4Nzk3NDI4Mn0.eyfrDJfuWJSJVJPfAUYb_p_c-LF_YULHGRaZx82MLLjMLCCFEEGckp8icuayf5bLW9ah20LzYYt0JgOBIB0RDg
}