🔧 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/algos/simon.go

@@ -0,0 +1,85 @@
+package algos
+
+// getBit 获取指定位的值
+func getBit(val uint64, pos int) uint64 {
+	if val&(1<<pos) != 0 {
+		return 1
+	}
+	return 0
+}
+
+// rotateLeft64 64位左循环移位
+func rotateLeft64(v uint64, n int) uint64 {
+	r := (v << n) | (v >> (64 - n))
+	return r & 0xFFFFFFFFFFFFFFFF
+}
+
+// rotateRight64 64位右循环移位
+func rotateRight64(v uint64, n int) uint64 {
+	r := (v << (64 - n)) | (v >> n)
+	return r & 0xFFFFFFFFFFFFFFFF
+}
+
+// keyExpansion 密钥扩展
+func keyExpansion(key []uint64) []uint64 {
+	expandedKey := make([]uint64, 72)
+	copy(expandedKey, key[:4])
+
+	var tmp uint64
+	for i := 4; i < 72; i++ {
+		tmp = rotateRight64(expandedKey[i-1], 3)
+		tmp = tmp ^ expandedKey[i-3]
+		tmp = tmp ^ rotateRight64(tmp, 1)
+		expandedKey[i] = (^expandedKey[i-4]) ^ tmp ^ getBit(0x3DC94C3A046D678B, (i-4)%62) ^ 3
+	}
+	return expandedKey
+}
+
+// SimonEnc Simon加密
+func SimonEnc(pt []uint64, k []uint64, c int) []uint64 {
+	key := make([]uint64, 72)
+	copy(key[:4], k[:4])
+	key = keyExpansion(key)
+
+	xi := pt[0]
+	xi1 := pt[1]
+
+	var tmp, f uint64
+	for i := 0; i < 72; i++ {
+		tmp = xi1
+		if c == 1 {
+			f = rotateLeft64(xi1, 1)
+		} else {
+			f = rotateLeft64(xi1, 1) & rotateLeft64(xi1, 8)
+		}
+		xi1 = xi ^ f ^ rotateLeft64(xi1, 2) ^ key[i]
+		xi = tmp
+	}
+
+	return []uint64{xi, xi1}
+}
+
+// SimonDec Simon解密
+func SimonDec(ct []uint64, k []uint64, c int) []uint64 {
+	key := make([]uint64, 72)
+	copy(key[:4], k[:4])
+	key = keyExpansion(key)
+
+	xi := ct[0]
+	xi1 := ct[1]
+
+	var tmp, f uint64
+	for i := 71; i >= 0; i-- {
+		tmp = xi
+		if c == 1 {
+			f = rotateLeft64(xi, 1)
+		} else {
+			f = rotateLeft64(xi, 1) & rotateLeft64(xi, 8)
+		}
+		xi = xi1 ^ f ^ rotateLeft64(xi, 2) ^ key[i]
+		xi1 = tmp
+	}
+
+	return []uint64{xi, xi1}
+}
+