<?php
/**
 * 建行参数解密测试脚本
 *
 * 用法：
 * php addons/shopro/test/test_decrypt.php
 */

// 手动加载phpseclib（避免触发FastAdmin/ThinkPHP初始化）
spl_autoload_register(function ($class) {
    $prefix = 'phpseclib3\\';
    $base_dir = __DIR__ . '/../../../vendor/phpseclib/phpseclib/phpseclib/';

    $len = strlen($prefix);
    if (strncmp($prefix, $class, $len) !== 0) {
        return;
    }

    $relative_class = substr($class, $len);
    $file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';

    if (file_exists($file)) {
        require $file;
    }
});

echo "========================================\n";
echo "   建行参数解密测试工具\n";
echo "========================================\n\n";

// 测试参数（来自你的URL）
$ccbParamSJ = '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';

echo "输入参数:\n";
echo "ccbParamSJ 长度: " . strlen($ccbParamSJ) . "\n\n";

// 从.env文件读取Service ID
$envFile = __DIR__ . '/../../../.env';
$serviceId = 'YS44000009001853';  // 默认值

if (file_exists($envFile)) {
    $envContent = file_get_contents($envFile);
    if (preg_match('/service_id\s*=\s*(.+)/i', $envContent, $matches)) {
        $serviceId = trim($matches[1]);
    }
}

echo "Service ID: {$serviceId}\n";
echo "DES密钥(前8位): " . substr($serviceId, 0, 8) . "\n\n";

// 执行解密
echo "========================================\n";
echo "开始解密...\n";
echo "========================================\n\n";

try {
    // 第一次 BASE64 解码
    echo "步骤1: 第一次BASE64解码\n";
    $firstDecode = base64_decode($ccbParamSJ);
    if ($firstDecode === false) {
        die("错误: 第一次BASE64解码失败\n");
    }
    echo "  解码成功，长度: " . strlen($firstDecode) . "\n";
    echo "  内容预览: " . substr($firstDecode, 0, 50) . "...\n\n";

    // 第二次 BASE64 解码
    echo "步骤2: 第二次BASE64解码\n";
    $secondDecode = base64_decode($firstDecode);
    if ($secondDecode === false) {
        die("错误: 第二次BASE64解码失败\n");
    }
    echo "  解码成功，长度: " . strlen($secondDecode) . "\n";
    echo "  十六进制预览: " . bin2hex(substr($secondDecode, 0, 32)) . "...\n\n";

    // DES 解密
    echo "步骤3: DES解密（尝试不同的密钥）\n";

    // 使用phpseclib进行DES-ECB解密
    if (!class_exists('\phpseclib3\Crypt\DES')) {
        die("错误: phpseclib未安装，请运行: composer require phpseclib/phpseclib\n");
    }

    // 尝试不同的密钥
    $possibleKeys = [
        substr($serviceId, 0, 8),  // serviceId前8位
        substr($serviceId, -8),    // serviceId后8位
        'YS440000',                 // 固定密钥
        '12345678',                 // 测试密钥
    ];

    $decrypted = false;
    $validKey = '';

    foreach ($possibleKeys as $testKey) {
        echo "  尝试密钥: {$testKey}\n";

        $cipher = new \phpseclib3\Crypt\DES('ecb');
        $cipher->setKey($testKey);
        $cipher->disablePadding();

        $result = $cipher->decrypt($secondDecode);

        // 验证解密结果是否合理（检查是否包含可见字符）
        if ($result !== false && !empty($result)) {
            // 尝试移除填充
            $textLength = strlen($result);
            $pad = ord($result[$textLength - 1]);

            // 填充值应该在1-8之间
            if ($pad >= 1 && $pad <= 8) {
                $unpadded = substr($result, 0, -1 * $pad);

                // 检查是否像URL参数（包含=或&）
                if (strpos($unpadded, '=') !== false || strpos($unpadded, '&') !== false) {
                    $decrypted = $unpadded;
                    $validKey = $testKey;
                    echo "  ✓ 找到正确密钥！\n";
                    break;
                }
            }
        }
    }

    if ($decrypted === false || empty($decrypted)) {
        die("\n错误: 所有密钥都无法正确解密\n");
    }

    $desKey = $validKey;

    echo "  解密成功，长度: " . strlen($decrypted) . "\n";
    echo "  解密内容: {$decrypted}\n\n";

    // 解析参数
    echo "步骤4: 解析参数\n";
    parse_str($decrypted, $params);
    echo "  解析结果:\n";
    foreach ($params as $key => $value) {
        echo "    {$key} = {$value}\n";
    }

    echo "\n========================================\n";
    echo "✅ 解密成功！\n";
    echo "========================================\n";

} catch (\Exception $e) {
    echo "\n========================================\n";
    echo "❌ 解密失败！\n";
    echo "========================================\n";
    echo "错误信息: " . $e->getMessage() . "\n";
    echo "错误行号: " . $e->getLine() . "\n";
    echo "错误文件: " . $e->getFile() . "\n";
}