nshop/app/Support/Magento1Password.php

<?php

namespace App\Support;

use Illuminate\Contracts\Auth\Authenticatable;
use Illuminate\Support\Facades\Hash;

/**
 * Magento 1.x password hashes: md5(password) or md5(salt + password).':'.salt
 */
class Magento1Password
{
    public static function verify(string $plain, string $hash): bool
    {
        if ($plain === '' || $hash === '') {
            return false;
        }

        $parts = explode(':', $hash);

        $computed = match (count($parts)) {
            1       => md5($plain),
            2       => md5($parts[1].$plain),
            default => null,
        };

        if ($computed === null) {
            return false;
        }

        return hash_equals($parts[0], $computed);
    }

    public static function upgradeToBcrypt(Authenticatable $customer, string $plain): void
    {
        $customer->password = Hash::make($plain);
        $customer->legacy_password = null;
        $customer->save();
    }

    public static function attempt(Authenticatable $customer, string $plain): bool
    {
        $stored = (string) $customer->getAuthPassword();

        try {
            if ($stored !== '' && Hash::check($plain, $stored)) {
                return true;
            }
        } catch (\Throwable) {
            // Magento hashes are not bcrypt; continue with the legacy verifier.
        }

        $legacy = (string) ($customer->legacy_password ?? '');

        if ($legacy !== '' && self::verify($plain, $legacy)) {
            self::upgradeToBcrypt($customer, $plain);

            return true;
        }

        return false;
    }
}