From 8ce86e4621e0cc1b0bf871629b6f5b8f1a46bc62 Mon Sep 17 00:00:00 2001
From: wolter <wolter@yourdomain.com>
Date: Wed, 8 May 2024 11:13:57 +0800
Subject: [PATCH] =?UTF-8?q?=E9=9A=8F=E6=9C=BA=E5=AD=97=E7=AC=A6=E4=B8=B2?=
 =?UTF-8?q?=E7=94=9F=E6=88=90?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/utils/encrypt/encrypt.go      | 37 +++++++++++++++++++++++++++++++
 app/utils/encrypt/encrypt_test.go | 15 +++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 app/utils/encrypt/encrypt.go
 create mode 100644 app/utils/encrypt/encrypt_test.go

diff --git a/app/utils/encrypt/encrypt.go b/app/utils/encrypt/encrypt.go
new file mode 100644
index 0000000..e7e7efa
--- /dev/null
+++ b/app/utils/encrypt/encrypt.go
@@ -0,0 +1,37 @@
+package encrypt
+
+import (
+	"math/rand"
+	"unsafe"
+)
+
+const lettersString = "0123456789abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ"
+
+// 字符串长度
+const number = 16
+
+/*
+16位码，前15位随机字符串，最后一位通过前15位字符串计算校验生成
+*/
+
+func LotteryEncryptEncode() string {
+	b := make([]byte, number)
+	var sum byte
+	for i := 0; i < number-1; i++ {
+		b[i] = lettersString[rand.Int63()%int64(len(lettersString))]
+		sum += b[i]
+	}
+	b[number-1] = lettersString[sum%byte(len(lettersString))]
+	return *(*string)(unsafe.Pointer(&b))
+}
+
+func LotteryEncryptDecode(str string) bool {
+	var sum byte
+	for i := 0; i < len(str)-1; i++ {
+		sum += str[i]
+	}
+	if lettersString[sum%byte(len(lettersString))] != str[len(str)-1] {
+		return false
+	}
+	return true
+}
diff --git a/app/utils/encrypt/encrypt_test.go b/app/utils/encrypt/encrypt_test.go
new file mode 100644
index 0000000..90577ef
--- /dev/null
+++ b/app/utils/encrypt/encrypt_test.go
@@ -0,0 +1,15 @@
+package encrypt
+
+import "testing"
+
+func TestLotteryEncryptEncode(t *testing.T) {
+	code := LotteryEncryptEncode()
+	t.Log(code)
+}
+
+func TestLotteryEncryptDecode(t *testing.T) {
+	code := LotteryEncryptEncode()
+	t.Log(code)
+	result := LotteryEncryptDecode(code)
+	t.Log(result)
+}