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| <?php | |
| if (!is_callable('sodium_crypto_sign_detached')) { | |
| function sodium_crypto_sign_detached($message, $key) { | |
| return substr(sodium_crypto_sign($message, $key), 0, 64); | |
| } | |
| } | |
| function encode_base64($data) { | |
| return rtrim(base64_encode($data), '='); | |
| } | |
| function ksort_recursive(&$array, $sort_flags = SORT_REGULAR) { | |
| if (!is_array($array) && !is_object($array)) return false; | |
| if (empty((array) $array)) return false; // Don't convert empty objects to arrays | |
| $array = (array) $array; | |
| ksort($array, $sort_flags); | |
| foreach ($array as &$arr) { | |
| ksort_recursive($arr, $sort_flags); | |
| } | |
| return true; | |
| } | |
| function sign_json($json_object, $signing_key, $signing_name) | |
| { | |
| if (is_array($json_object)) { | |
| if (isset($json_object['signatures'])) { | |
| $signatures = $json_object['signatures']; | |
| unset($json_object['signatures']); | |
| } | |
| if (isset($json_object['unsigned'])) { | |
| $unsigned = $json_object['unsigned']; | |
| unset($json_object['unsigned']); | |
| } | |
| } else { | |
| if (isset($json_object->signatures)) { | |
| $signatures = $json_object->signatures; | |
| unset($json_object->signatures); | |
| } | |
| if (isset($json_object->unsigned)) { | |
| $unsigned = $json_object->unsigned; | |
| unset($json_object->unsigned); | |
| } | |
| } | |
| ksort_recursive($json_object); | |
| $signed = sodium_crypto_sign_detached(json_encode($json_object, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES), $signing_key['key']); | |
| $signature_base64 = encode_base64($signed); | |
| $key_id = $signing_key['alg'] . ':' . $signing_key['version']; | |
| $signatures[$signing_name][$key_id] = $signature_base64; | |
| if (is_array($json_object)) { | |
| $json_object["signatures"] = $signatures; | |
| if (!empty($unsigned)) { | |
| $json_object["unsigned"] = $unsigned; | |
| } | |
| } else { | |
| $json_object->signatures = $signatures; | |
| if (!empty($unsigned)) { | |
| $json_object->unsigned = $unsigned; | |
| } | |
| } | |
| return $json_object; | |
| } | |
| $signing_key = @json_decode(file_get_contents('./signing_key.json'), true); | |
| if (empty($signing_key) || !$signing_key['seed']) { | |
| $seed = random_bytes(32); | |
| $keypair = sodium_crypto_sign_seed_keypair($seed); | |
| $keypair_secret = sodium_crypto_sign_secretkey($keypair); | |
| $keypair_public = sodium_crypto_sign_publickey($keypair); | |
| $signing_key = array( | |
| 'key' => $keypair_secret, | |
| 'public' => $keypair_public, | |
| 'alg' => 'ed25519', | |
| 'version' => '2', | |
| ); | |
| $json = '{"seed":"' . bin2hex($seed) . '","key":"' . bin2hex($keypair_secret) . '","public":"' . bin2hex($keypair_public) . '","alg":"ed25519","version":"2"}'; | |
| file_put_contents('./signing_key.json', $json); | |
| } else { | |
| $signing_key['key'] = hex2bin($signing_key['key']); | |
| $signing_key['public'] = hex2bin($signing_key['public']); | |
| } | |
| $data = array(); | |
| $data['server_name'] = $config['server_name']; | |
| $data['verify_keys'] = array( | |
| $signing_key['alg'] . ':' . $signing_key['version'] => | |
| array( | |
| 'key' => encode_base64($signing_key['public']), | |
| ), | |
| ); | |
| $data['old_verify_keys'] = new StdClass(); | |
| $data['tls_fingerprints'] = array(); | |
| $data['valid_until_ts'] = (strtotime('midnight +10 days')) * 1000; | |
| header('Content-Type: application/json'); | |
| echo json_encode(sign_json($data, $signing_key, $config['server_name']), JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES); |
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