Hash a Password with Argon2 (Defaults)

Demonstrates Crypt2.Argon2HashPassword, which hashes a password with Argon2 and returns a PHC-format string. Passing an empty options string uses all defaults, including a random salt.

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

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

    const crypt = try chilkat.Crypt2.init();
    defer crypt.deinit();

    // The password should come from a secure source rather than being hard-coded.
    const password = "correct horse battery staple";

    // Hash the password using all defaults by passing an empty options string.  The defaults are
    // Argon2id, version 19, 3 iterations, 64 MB of memory, 1 lane, a 32-byte hash, and a 16-byte random
    // salt.  A random salt is generated automatically, which is what should normally happen.
    const phc_hash = crypt.argon2HashPassword(alloc, password, "") catch {
        std.debug.print("{s}\n", .{try crypt.getLastErrorText(alloc)});
        return;
    };

    // The returned PHC-format string records the variant, version, cost parameters, salt, and hash --
    // everything needed to verify the password later.  Store the whole string.
    std.debug.print("{s}\n", .{phc_hash});
}