JCode

JCode is a Bukkit plugin that generates short, secure, time-based authentication codes for players.
These codes can be used to authenticate players with external services such as cape or skin systems.

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Features

• Secure SHA-256 code generation
• Codes change every 5 minutes
• Per-player & per-service codes
• Configurable secret key
• Permission-based access

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Installation

1. Place JCode.jar in your plugins/ folder.
2. Start the server to create config.yml.
3. Edit settings.key.value with your own secure key.
4. Restart or reload the server.

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Command

/jcode <service> — Generates a code for the given service.
Requires jcode.code and jcode.code.<service> permissions.

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How Codes Work

1. Determine current 5-minute epoch block:

   currentEpochMinutes / 5
   

2. Create hash from:

   player-uuid : config-key : epoch-block : service
   

3. Take the first 6 characters as the code.

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🖥 PHP Verification Example

<?php
function generateJCode($playerUuid, $configKey, $service) {
    $epochMinutes = floor(microtime(true) / 60);
    $block = floor($epochMinutes / 5);
    $codeString = $playerUuid . ":" . $configKey . ":" . $block . ":" . strtolower($service);
    $hash = hash("sha256", $codeString);
    return substr($hash, 0, 6);
}

$uuid = "123e4567-e89b-12d3-a456-426614174000";
$key = "your-secure-key";
$service = "cape";

echo "Generated code: " . generateJCode($uuid, $key, $service);
?>

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License

MIT License, software is provided as is. See LICENSE.md for more information.