🔧 chore: 初始化番茄小说 API 项目结构

新增项目基础框架，包含核心 API 实现、算法模块、HTTP 处理器等完整功能模块

internal/fqapi/ttencrypt.go

@@ -0,0 +1,196 @@
+package fqapi
+
+import (
+	"bytes"
+	"compress/gzip"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/sha512"
+	"encoding/base64"
+	"fmt"
+	"io"
+)
+
+// FIXED_STRING 固定字符串（base64解码后的值）
+var FIXED_STRING = []byte{
+	0x4D, 0xD4, 0xC2, 0xE6, 0xB8, 0x31, 0x62, 0x09,
+	0x0E, 0x52, 0xB3, 0xC7, 0xA6, 0x73, 0x3B, 0xA4,
+	0x1C, 0xB2, 0x46, 0x2B, 0x82, 0x9A, 0xB5, 0x8A,
+	0x19, 0x6B, 0x39, 0xDB, 0x57, 0x17, 0x75, 0x24,
+	0xF4, 0x9B, 0xAF, 0x7F, 0x08, 0xE8, 0xD6, 0x8D,
+	0x26, 0xA7, 0x2E, 0x37, 0xC1, 0xA9, 0x5A, 0x2F,
+	0x1F, 0x05, 0xA5, 0x18, 0x92, 0xAE, 0xF2, 0x94,
+	0x97, 0x32, 0xB6, 0x2A, 0x38, 0xAA, 0xDD, 0x58,
+}
+
+// sha512Hash 计算SHA512哈希值
+func sha512Hash(data []byte) []byte {
+	hash := sha512.Sum512(data)
+	return hash[:]
+}
+
+// generateRandomBytes 生成指定长度的随机字节
+func generateRandomBytes(size int) []byte {
+	bytes := make([]byte, size)
+	rand.Read(bytes)
+	return bytes
+}
+
+// gzipCompress 使用gzip压缩数据
+func gzipCompress(data []byte) ([]byte, error) {
+	buf := new(bytes.Buffer)
+	writer := gzip.NewWriter(buf)
+	_, err := writer.Write(data)
+	if err != nil {
+		return nil, err
+	}
+	err = writer.Close()
+	if err != nil {
+		return nil, err
+	}
+
+	return buf.Bytes(), nil
+}
+
+// gzipDecompress 使用gzip解压缩数据
+func gzipDecompress(data []byte) ([]byte, error) {
+	reader, err := gzip.NewReader(bytes.NewReader(data))
+	if err != nil {
+		return nil, err
+	}
+	defer reader.Close()
+
+	result, err := io.ReadAll(reader)
+	if err != nil {
+		return nil, err
+	}
+
+	return result, nil
+}
+
+// encryptData 使用AES-CBC模式加密数据
+func encryptData(data []byte, key []byte, iv []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	// PKCS7填充
+	padding := aes.BlockSize - len(data)%aes.BlockSize
+	padText := bytes.Repeat([]byte{byte(padding)}, padding)
+	paddedData := append(data, padText...)
+
+	ciphertext := make([]byte, len(paddedData))
+	mode := cipher.NewCBCEncrypter(block, iv)
+	mode.CryptBlocks(ciphertext, paddedData)
+
+	return ciphertext, nil
+}
+
+// decryptData 使用AES-CBC模式解密数据
+func decryptData(data []byte, key []byte, iv []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	mode := cipher.NewCBCDecrypter(block, iv)
+	decrypted := make([]byte, len(data))
+	mode.CryptBlocks(decrypted, data)
+
+	// 移除PKCS7填充
+	padding := int(decrypted[len(decrypted)-1])
+	return decrypted[:len(decrypted)-padding], nil
+}
+
+// TTEncrypt 加密函数
+func TTEncrypt(data []byte) ([]byte, error) {
+	// 生成随机值
+	randomValue := generateRandomBytes(32)
+
+	// 计算SHA512哈希值
+	hashValue := sha512Hash(append(sha512Hash(randomValue), FIXED_STRING...))
+
+	// 提取key和iv
+	key := hashValue[:16]
+	iv := hashValue[16:32]
+
+	// 压缩数据并计算哈希值
+	compressedData, err := gzipCompress(data)
+	if err != nil {
+		return nil, err
+	}
+	hashedData := append(sha512Hash(compressedData), compressedData...)
+
+	// 加密数据
+	encryptedData, err := encryptData(hashedData, key, iv)
+	if err != nil {
+		return nil, err
+	}
+
+	// 返回结果
+	header := []byte{116, 99, 5, 16, 0, 0}
+	result := append(header, randomValue...)
+	result = append(result, encryptedData...)
+
+	return result, nil
+}
+
+// TTDecrypt 解密函数
+func TTDecrypt(encryptedData []byte) ([]byte, error) {
+	// 提取固定头、随机值和加密数据
+	// header := encryptedData[:6]
+	randomValue := encryptedData[6:38]
+	encryptedPayload := encryptedData[38:]
+
+	// 计算SHA512哈希值
+	hashValue := sha512Hash(append(sha512Hash(randomValue), FIXED_STRING...))
+
+	// 提取key和iv
+	key := hashValue[:16]
+	iv := hashValue[16:32]
+
+	// 解密数据
+	decryptedData, err := decryptData(encryptedPayload, key, iv)
+	if err != nil {
+		return nil, err
+	}
+
+	// 分离哈希值和压缩数据
+	hashLength := 64
+	hashedValue := decryptedData[:hashLength]
+	compressedData := decryptedData[hashLength:]
+
+	// 验证哈希值
+	expectedHash := sha512Hash(compressedData)
+	for i := 0; i < hashLength; i++ {
+		if hashedValue[i] != expectedHash[i] {
+			return nil, fmt.Errorf("hash verification failed")
+		}
+	}
+
+	// 解压缩数据
+	originalData, err := gzipDecompress(compressedData)
+	if err != nil {
+		return nil, err
+	}
+
+	return originalData, nil
+}
+
+// Encrypt 导出的加密函数
+func Encrypt(data []byte) string {
+	result, _ := TTEncrypt(data)
+	return base64.StdEncoding.EncodeToString(result)
+}
+
+// Decrypt 导出的解密函数
+func Decrypt(encryptedStr string) ([]byte, error) {
+	encryptedData, err := base64.StdEncoding.DecodeString(encryptedStr)
+	if err != nil {
+		return nil, err
+	}
+	return TTDecrypt(encryptedData)
+}
+