feat(phase4): Phase 4.1 基础设施 - Feistel-8 + QR签名 + 短码编解码
Phase 4.1 完成： - BaseService.php 新增方法： - getVrSecret(): 获取 VR Ticket 主密钥 - getGoodsKey(): per-goods key 派生（HMAC-SHA256） - feistelRound(): Feistel Round 函数（低19bit） - feistelEncode(): Feistel-8 混淆编码（8轮置换） - feistelDecode(): Feistel-8 解码（逆向8轮） - shortCodeEncode(): 短码生成（goods_id<<17 | ticket_id → Feistel8 → base36） - shortCodeDecode(): 短码解析（暴力搜索 goods_id） - signQrPayload(): QR payload 签名（HMAC-SHA256） - verifyQrPayload(): QR payload 验证（含过期检查） 位分配设计： - goods_id: 高16bit（支持0-65535） - ticket_id: 低17bit（支持0-131071） - 总计33bit，Feistel-8混淆后转base36 安全特性： - per-goods key 由 master_secret 派生，不同商品互相独立 - QR签名防篡改，HMAC-SHA256 - 30分钟有效期窗口 新增测试： - tests/phase4_1_feistel_test.phpfeat/phase4-ticket-wallet
Council
parent
b4078d1cfc
commit
c3bf8ba2aa
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@ -285,4 +285,248 @@ class BaseService
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],
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];
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}
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/**
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* Phase 4: Feistel-8 混淆 + QR签名 + 短码编解码
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* ================================================================
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*/
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/**
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* 获取 VR Ticket 主密钥
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*/
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private static function getVrSecret(): string
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{
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$secret = env('VR_TICKET_SECRET', 'vrt-default-secret-change-me');
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if ($secret === 'vrt-default-secret-change-me') {
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self::log('WARNING: using default VR_TICKET_SECRET, set in .env for production', [], 'warning');
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}
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return $secret;
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}
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/**
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* 获取 per-goods key
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* 由 master_secret 派生，保证不同商品的编码互相独立
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*
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* @param int $goods_id
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* @return string 16字节hex
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*/
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public static function getGoodsKey(int $goods_id): string
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{
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static $cache = [];
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if (!isset($cache[$goods_id])) {
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$secret = self::getVrSecret();
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// HMAC-SHA256(master_secret, goods_id) 取前16字节
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$cache[$goods_id] = substr(hash_hmac('sha256', (string)$goods_id, $secret), 0, 16);
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}
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return $cache[$goods_id];
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}
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/**
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* Feistel Round 函数
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* F(R, i, key) = HMAC-SHA256(R . i, key) 的低19bit
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*
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* @param int $R 17bit 右半部分
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* @param int $round 轮次 [0-7]
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* @param string $key per-goods key
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* @return int 19bit 输出
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*/
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private static function feistelRound(int $R, int $round, string $key): int
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{
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$hmac = hash_hmac('sha256', $R . '.' . $round, $key, true);
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// 取前3字节(24bit)，保留低19bit
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$val = (ord($hmac[0]) << 16) | (ord($hmac[1]) << 8) | ord($hmac[2]);
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return $val & 0x7FFFF; // 19bit mask
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}
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/**
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* Feistel-8 混淆编码
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*
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* 位分配：L=19bit, R=17bit（凑满36bit）
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* @param int $packed 33bit整数（goods_id<<17 | ticket_id）
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* @param string $key per-goods key
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* @return string base36编码
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*/
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public static function feistelEncode(int $packed, string $key): string
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{
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// 分离 L(高19bit) 和 R(低17bit)
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$L = ($packed >> 17) & 0x7FFFF;
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$R = $packed & 0x1FFFF;
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// 8轮 Feistel 置换
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for ($i = 0; $i < 8; $i++) {
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$F = self::feistelRound($R, $i, $key);
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$L_new = $R;
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$R_new = $L ^ $F;
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$L = $L_new;
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$R = $R_new;
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}
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// 合并为36bit整数
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$result = ($L & 0x7FFFF) | (($R & 0x1FFFF) << 17);
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return base_convert($result, 10, 36);
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}
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/**
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* Feistel-8 解码（逆向8轮）
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*
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* @param string $code base36编码
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* @param string $key per-goods key
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* @return int 整数
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*/
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public static function feistelDecode(string $code, string $key): int
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{
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$packed = intval(base_convert(strtolower($code), 36, 10));
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// 分离 L 和 R
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$L = ($packed >> 17) & 0x7FFFF;
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$R = $packed & 0x1FFFF;
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// 8轮逆向 Feistel 置换
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for ($i = 7; $i >= 0; $i--) {
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$F = self::feistelRound($L, $i, $key);
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$R_new = $L;
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$L_new = $R ^ $F;
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$R = $R_new;
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$L = $L_new;
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}
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// 合并
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return ($L & 0x7FFFF) | (($R & 0x1FFFF) << 17);
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}
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/**
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* 生成短码
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*
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* 位分配：goods_id(高16bit) + ticket_id(低17bit) = 33bit → Feistel8 → base36
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*
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* @param int $goods_id
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* @param int $ticket_id ticket_id 必须 ≤ 131071 (17bit)
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* @return string base36小写短码
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* @throws \Exception 如果 ticket_id 超出17bit范围
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*/
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public static function shortCodeEncode(int $goods_id, int $ticket_id): string
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{
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// 验证 ticket_id 不超过 17bit
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if ($ticket_id > 0x1FFFF) {
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throw new \Exception("ticket_id 超出17bit范围 (max=131071), given={$ticket_id}");
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}
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// 位打包：goods_id(16bit) << 17 | ticket_id(17bit)
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$packed = ($goods_id << 17) | $ticket_id;
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// Feistel8 混淆
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$key = self::getGoodsKey($goods_id);
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return strtolower(self::feistelEncode($packed, $key));
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}
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/**
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* 解析短码（解码回 goods_id + ticket_id）
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*
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* @param string $code 短码（小写或大写均可）
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* @param int|null $goods_id_hint 可选的商品ID提示（用于优化搜索）
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* @return array ['goods_id' => int, 'ticket_id' => int]
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* @throws \Exception 如果找不到匹配的 goods_id
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*/
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public static function shortCodeDecode(string $code, ?int $goods_id_hint = null): array
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{
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$code = strtolower($code);
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// 候选 goods_id 列表
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$candidates = [];
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if ($goods_id_hint !== null) {
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$candidates[] = $goods_id_hint;
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}
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// 暴力搜索：ShopXO 商品 ID 通常 < 100000
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$max_goods = 100000;
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for ($gid = 1; $gid <= $max_goods; $gid++) {
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if ($goods_id_hint !== null && $gid !== $goods_id_hint) {
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continue;
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}
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$candidates[] = $gid;
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}
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foreach ($candidates as $gid) {
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$key = self::getGoodsKey($gid);
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$packed = self::feistelDecode($code, $key);
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// 提取 goods_id：高16bit
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$decoded_goods_id = ($packed >> 17) & 0xFFFF;
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// 提取 ticket_id：低17bit
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$decoded_ticket_id = $packed & 0x1FFFF;
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// 验证 goods_id 是否匹配
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if ($decoded_goods_id === $gid) {
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return [
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'goods_id' => $gid,
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'ticket_id' => $decoded_ticket_id,
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];
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}
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}
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throw new \Exception("短码解码失败：无法找到匹配的 goods_id (code={$code})");
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}
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/**
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* 签名 QR payload（HMAC-SHA256 防篡改）
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*
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* @param array $payload ['id'=>int, 'g'=>int(goods_id), 'iat'=>int, 'exp'=>int]
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* @return string base64编码的签名内容
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*/
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public static function signQrPayload(array $payload): string
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{
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$secret = self::getVrSecret();
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// 签名内容：id.g.iat.exp
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$sign_str = $payload['id'] . '.' . $payload['g'] . '.' . $payload['iat'] . '.' . $payload['exp'];
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$sig = substr(hash_hmac('sha256', $sign_str, $secret), 0, 8);
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$payload['sig'] = $sig;
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return base64_encode(json_encode($payload, JSON_UNESCAPED_UNICODE));
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}
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/**
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* 验证 QR payload
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*
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* @param string $encoded base64编码
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* @return array|null 验证失败返回null，成功返回 payload（含id/g/exp）
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*/
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public static function verifyQrPayload(string $encoded)
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{
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$json = base64_decode($encoded);
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if ($json === false) {
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return null;
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}
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$payload = json_decode($json, true);
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if (!is_array($payload)) {
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return null;
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}
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// 必填字段检查
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if (!isset($payload['id'], $payload['g'], $payload['iat'], $payload['exp'], $payload['sig'])) {
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return null;
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}
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// 时间戳检查：是否过期
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if ($payload['exp'] < time()) {
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return null;
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}
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// 签名验证
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$secret = self::getVrSecret();
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$sign_str = $payload['id'] . '.' . $payload['g'] . '.' . $payload['iat'] . '.' . $payload['exp'];
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$expected_sig = substr(hash_hmac('sha256', $sign_str, $secret), 0, 8);
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if (!hash_equals($expected_sig, $payload['sig'])) {
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return null;
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}
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return [
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'id' => intval($payload['id']),
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'g' => intval($payload['g']),
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'exp' => intval($payload['exp']),
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];
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}
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}
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@ -0,0 +1,283 @@
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<?php
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/**
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* Phase 4.1 单元测试：Feistel-8 + QR签名 + 短码编解码
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*
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* 运行方式：php tests/phase4_1_feistel_test.php
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*
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* 测试覆盖：
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* 1. Feistel-8 往返测试（encode → decode = 原值）
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* 2. 短码编解码往返测试
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* 3. QR签名/验签测试
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* 4. 边界条件测试
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*/
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// 模拟 getVrSecret 和 getGoodsKey（不依赖 ShopXO）
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function getVrSecret(): string
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{
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return 'vrt-test-secret-for-unit-test';
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}
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function getGoodsKey(int $goods_id): string
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{
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static $cache = [];
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if (!isset($cache[$goods_id])) {
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$secret = getVrSecret();
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$cache[$goods_id] = substr(hash_hmac('sha256', (string)$goods_id, $secret), 0, 16);
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}
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return $cache[$goods_id];
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}
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function feistelRound(int $R, int $round, string $key): int
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{
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$hmac = hash_hmac('sha256', $R . '.' . $round, $key, true);
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$val = (ord($hmac[0]) << 16) | (ord($hmac[1]) << 8) | ord($hmac[2]);
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return $val & 0x7FFFF; // 19bit mask
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}
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function feistelEncode(int $packed, string $key): string
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{
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$L = ($packed >> 17) & 0x7FFFF;
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$R = $packed & 0x1FFFF;
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for ($i = 0; $i < 8; $i++) {
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$F = feistelRound($R, $i, $key);
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$L_new = $R;
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$R_new = $L ^ $F;
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$L = $L_new;
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$R = $R_new;
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}
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$result = ($L & 0x7FFFF) | (($R & 0x1FFFF) << 17);
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return base_convert($result, 10, 36);
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}
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function feistelDecode(string $code, string $key): int
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{
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$packed = intval(base_convert(strtolower($code), 36, 10));
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$L = ($packed >> 17) & 0x7FFFF;
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$R = $packed & 0x1FFFF;
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for ($i = 7; $i >= 0; $i--) {
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$F = feistelRound($L, $i, $key);
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$R_new = $L;
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$L_new = $R ^ $F;
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$R = $R_new;
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$L = $L_new;
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}
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return ($L & 0x7FFFF) | (($R & 0x1FFFF) << 17);
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}
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function shortCodeEncode(int $goods_id, int $ticket_id): string
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{
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if ($ticket_id > 0x1FFFF) {
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throw new Exception("ticket_id 超出17bit范围 (max=131071), given={$ticket_id}");
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}
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$packed = ($goods_id << 17) | $ticket_id;
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$key = getGoodsKey($goods_id);
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return strtolower(feistelEncode($packed, $key));
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}
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function shortCodeDecode(string $code, ?int $goods_id_hint = null): array
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{
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$code = strtolower($code);
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$candidates = [];
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if ($goods_id_hint !== null) {
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$candidates[] = $goods_id_hint;
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}
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$max_goods = 100000;
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for ($gid = 1; $gid <= $max_goods; $gid++) {
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if ($goods_id_hint !== null && $gid !== $goods_id_hint) {
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continue;
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}
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$candidates[] = $gid;
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}
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foreach ($candidates as $gid) {
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$key = getGoodsKey($gid);
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$packed = feistelDecode($code, $key);
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$decoded_goods_id = ($packed >> 17) & 0xFFFF;
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$decoded_ticket_id = $packed & 0x1FFFF;
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if ($decoded_goods_id === $gid) {
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return ['goods_id' => $gid, 'ticket_id' => $decoded_ticket_id];
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}
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}
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throw new Exception("短码解码失败：无法找到匹配的 goods_id (code={$code})");
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}
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function signQrPayload(array $payload): string
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{
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$secret = getVrSecret();
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$sign_str = $payload['id'] . '.' . $payload['g'] . '.' . $payload['iat'] . '.' . $payload['exp'];
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$sig = substr(hash_hmac('sha256', $sign_str, $secret), 0, 8);
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$payload['sig'] = $sig;
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return base64_encode(json_encode($payload, JSON_UNESCAPED_UNICODE));
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}
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function verifyQrPayload(string $encoded)
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{
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$json = base64_decode($encoded);
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if ($json === false) return null;
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$payload = json_decode($json, true);
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if (!is_array($payload)) return null;
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if (!isset($payload['id'], $payload['g'], $payload['iat'], $payload['exp'], $payload['sig'])) return null;
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if ($payload['exp'] < time()) return null;
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$secret = getVrSecret();
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$sign_str = $payload['id'] . '.' . $payload['g'] . '.' . $payload['iat'] . '.' . $payload['exp'];
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$expected_sig = substr(hash_hmac('sha256', $sign_str, $secret), 0, 8);
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if (!hash_equals($expected_sig, $payload['sig'])) return null;
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return ['id' => intval($payload['id']), 'g' => intval($payload['g']), 'exp' => intval($payload['exp'])];
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}
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// ==================== 测试用例 ====================
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$passed = 0;
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$failed = 0;
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function assert_true($condition, $test_name) {
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global $passed, $failed;
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if ($condition) {
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echo "✅ PASS: {$test_name}\n";
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$passed++;
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} else {
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echo "❌ FAIL: {$test_name}\n";
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$failed++;
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}
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}
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function assert_equals($expected, $actual, $test_name) {
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global $passed, $failed;
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if ($expected === $actual) {
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echo "✅ PASS: {$test_name}\n";
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$passed++;
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} else {
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echo "❌ FAIL: {$test_name} - Expected: {$expected}, Got: {$actual}\n";
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$failed++;
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}
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}
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echo "========================================\n";
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echo "Phase 4.1 单元测试：Feistel-8 + QR签名\n";
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echo "========================================\n\n";
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// Test 1: Feistel-8 往返测试
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echo "--- Feistel-8 编解码往返测试 ---\n";
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$key = 'test-key-12345678';
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$test_cases = [
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['input' => 0, 'desc' => '全0'],
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['input' => 1, 'desc' => '最小值'],
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['input' => 0xFFFFFFFF, 'desc' => '最大值(32bit)'],
|
||||
['input' => 118 << 17, 'desc' => 'goods_id=118'],
|
||||
['input' => (118 << 17) | 482815, 'desc' => 'goods_id=118, ticket_id=482815'],
|
||||
['input' => 100000 << 17, 'desc' => 'goods_id=100000'],
|
||||
];
|
||||
|
||||
foreach ($test_cases as $tc) {
|
||||
$encoded = feistelEncode($tc['input'], $key);
|
||||
$decoded = feistelDecode($encoded, $key);
|
||||
assert_equals($tc['input'], $decoded, "Feistel-8 {$tc['desc']}: {$tc['input']} → {$encoded} → {$decoded}");
|
||||
}
|
||||
|
||||
// Test 2: 短码编解码往返测试（不带hint）
|
||||
echo "\n--- 短码编解码往返测试 ---\n";
|
||||
$short_code_cases = [
|
||||
['goods_id' => 118, 'ticket_id' => 1, 'desc' => '商品118, 第1张票'],
|
||||
['goods_id' => 118, 'ticket_id' => 100, 'desc' => '商品118, 第100张票'],
|
||||
['goods_id' => 118, 'ticket_id' => 482815, 'desc' => '商品118, 第482815张票'],
|
||||
['goods_id' => 100, 'ticket_id' => 50000, 'desc' => '商品100, 第50000张票'],
|
||||
['goods_id' => 9999, 'ticket_id' => 65535, 'desc' => '商品9999, ticket_id=65535(16bit)'],
|
||||
];
|
||||
|
||||
foreach ($short_code_cases as $tc) {
|
||||
$code = shortCodeEncode($tc['goods_id'], $tc['ticket_id']);
|
||||
$decoded = shortCodeDecode($code);
|
||||
assert_equals($tc['goods_id'], $decoded['goods_id'], "短码-{$tc['desc']}: goods_id");
|
||||
assert_equals($tc['ticket_id'], $decoded['ticket_id'], "短码-{$tc['desc']}: ticket_id");
|
||||
}
|
||||
|
||||
// Test 3: 短码带 hint 解码（性能优化验证）
|
||||
echo "\n--- 短码带 hint 解码测试 ---\n";
|
||||
$code = shortCodeEncode(118, 12345);
|
||||
$decoded = shortCodeDecode($code, 118);
|
||||
assert_equals(118, $decoded['goods_id'], "带hint解码: goods_id");
|
||||
assert_equals(12345, $decoded['ticket_id'], "带hint解码: ticket_id");
|
||||
|
||||
// Test 4: QR签名/验签测试
|
||||
echo "\n--- QR签名/验签测试 ---\n";
|
||||
$now = time();
|
||||
$payload = [
|
||||
'id' => 482815,
|
||||
'g' => 118,
|
||||
'iat' => $now,
|
||||
'exp' => $now + 1800, // 30分钟
|
||||
];
|
||||
$signed = signQrPayload($payload);
|
||||
$verified = verifyQrPayload($signed);
|
||||
assert_true($verified !== null, "QR签名验证: 签名有效");
|
||||
if ($verified) {
|
||||
assert_equals(482815, $verified['id'], "QR签名验证: id匹配");
|
||||
assert_equals(118, $verified['g'], "QR签名验证: goods_id匹配");
|
||||
}
|
||||
|
||||
// Test 5: QR签名防篡改测试
|
||||
echo "\n--- QR签名防篡改测试 ---\n";
|
||||
$json = base64_decode($signed);
|
||||
$malicious_data = json_decode($json, true);
|
||||
$malicious_data['id'] = 999999; // 篡改
|
||||
$malicious_signed = base64_encode(json_encode($malicious_data, JSON_UNESCAPED_UNICODE));
|
||||
$verified = verifyQrPayload($malicious_signed);
|
||||
assert_true($verified === null, "QR防篡改: 篡改后应返回null");
|
||||
|
||||
// Test 6: QR过期测试
|
||||
echo "\n--- QR过期测试 ---\n";
|
||||
$expired_payload = [
|
||||
'id' => 1,
|
||||
'g' => 118,
|
||||
'iat' => $now - 3600,
|
||||
'exp' => $now - 1800, // 已过期
|
||||
];
|
||||
$expired_signed = signQrPayload($expired_payload);
|
||||
$verified = verifyQrPayload($expired_signed);
|
||||
assert_true($verified === null, "QR过期测试: 已过期应返回null");
|
||||
|
||||
// Test 7: 边界条件 - ticket_id 超出17bit
|
||||
echo "\n--- 边界条件测试 ---\n";
|
||||
try {
|
||||
shortCodeEncode(118, 131072); // 超出17bit
|
||||
echo "❌ FAIL: ticket_id超出17bit应抛出异常\n";
|
||||
$failed++;
|
||||
} catch (Exception $e) {
|
||||
echo "✅ PASS: ticket_id超出17bit正确抛出异常\n";
|
||||
$passed++;
|
||||
}
|
||||
|
||||
// Test 8: ticket_id 最大17bit值
|
||||
$max_ticket = 131071; // 0x1FFFF
|
||||
$code = shortCodeEncode(118, $max_ticket);
|
||||
$decoded = shortCodeDecode($code);
|
||||
assert_equals(118, $decoded['goods_id'], "最大ticket_id: goods_id");
|
||||
assert_equals($max_ticket, $decoded['ticket_id'], "最大ticket_id: ticket_id = 131071");
|
||||
|
||||
// Test 9: 不同商品 key 不同
|
||||
echo "\n--- Per-goods key 隔离测试 ---\n";
|
||||
$code1 = shortCodeEncode(118, 1000);
|
||||
$code2 = shortCodeEncode(119, 1000);
|
||||
assert_true($code1 !== $code2, "不同商品相同ticket_id生成不同短码");
|
||||
|
||||
// Test 10: 暴力解码性能测试（仅验证正确性，不测性能）
|
||||
echo "\n--- 暴力解码正确性测试 ---\n";
|
||||
$code = shortCodeEncode(100, 5000);
|
||||
$decoded = shortCodeDecode($code);
|
||||
assert_equals(100, $decoded['goods_id'], "暴力解码: goods_id=100");
|
||||
assert_equals(5000, $decoded['ticket_id'], "暴力解码: ticket_id=5000");
|
||||
|
||||
// ==================== 测试结果 ====================
|
||||
echo "\n========================================\n";
|
||||
echo "测试结果: {$passed} passed, {$failed} failed\n";
|
||||
echo "========================================\n";
|
||||
|
||||
if ($failed > 0) {
|
||||
exit(1);
|
||||
}
|
||||
echo "🎉 所有测试通过！\n";
|
||||
exit(0);
|
||||
Loading…
Reference in New Issue