Initial commit

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-15 13:57:10 +08:00
commit 8679200f41
1897 changed files with 257900 additions and 0 deletions
@@ -0,0 +1,755 @@
+package crypt
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/hmac"
+	"crypto/md5"
+	"crypto/rand"
+	"crypto/sha1"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"hash/crc32"
+	"io"
+	"net/url"
+	"os"
+	"reflect"
+	"sort"
+	"strconv"
+	"strings"
+
+	"91porn-server/common/crypt/ecb"
+	sli "91porn-server/common/slice"
+
+	"github.com/dgrijalva/jwt-go"
+)
+
+// CreateToken  生成Token算法
+func CreateToken(secret string, tokenClaims map[string]interface{}) (tokeness string, err error) {
+	if secret == "" {
+		return "", errors.New("secret is empty")
+	}
+	claims := jwt.MapClaims(tokenClaims)
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(secret))
+}
+
+func keyFunc(secret string) jwt.Keyfunc {
+	return func(token *jwt.Token) (interface{}, error) {
+		return []byte(secret), nil
+	}
+}
+
+// ParseToken 解析Token
+func ParseToken(secret string, tokeness string) (map[string]interface{}, error) {
+	if secret == "" || tokeness == "" {
+		return nil, errors.New("secret or tokeness is empty")
+	}
+	token, err := jwt.Parse(tokeness, keyFunc(secret))
+	if err != nil {
+		return nil, err
+	}
+	//验证token，如果token被修改过则为false
+	if !token.Valid {
+		return nil, errors.New("token is invalid")
+	}
+	claimsToken, ok := token.Claims.(jwt.MapClaims)
+	if !ok {
+		return nil, errors.New("cannot convert claim to MapClaim")
+	}
+	return claimsToken, nil
+}
+
+// StructToStr 结构体转json 先对结构体按照字典顺序排序 并返回字符串
+func StructToStr(obj interface{}) (string, error) {
+	if obj == nil {
+		return "", errors.New("obj is not nil")
+	}
+	data := make(map[string]interface{})
+	bytes, err := json.Marshal(obj)
+	if err != nil {
+		return "", err
+	}
+	if err = json.Unmarshal(bytes, &data); err != nil {
+		return "", err
+	}
+	return MapToStr(data)
+}
+
+func JsonStr2Str(str string, key ...string) string {
+	if str == "" {
+		return ""
+	}
+	mapstr, err := JSON2Map(str)
+	if err != nil {
+		return ""
+	}
+	sortStr, err := MapToStrSkipObject(mapstr, key...)
+	if err != nil {
+		return ""
+	}
+	return sortStr
+}
+
+func Obj2Obj(src, dest interface{}) error {
+	data, err := json.Marshal(src)
+	if err != nil {
+		return err
+	}
+	return json.Unmarshal(data, dest)
+}
+
+// MapToStr 对map按照字典顺序排序 并返回字符串
+func MapToStr(data map[string]interface{}) (string, error) {
+	if len(data) == 0 {
+		return "", errors.New("data is nil or empty")
+	}
+	newData := make(map[string]interface{})
+	keys := make([]string, 0, len(data))
+	for k := range data {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	for _, k := range keys {
+		newData[k] = data[k]
+	}
+	b, err := json.Marshal(newData)
+	if err != nil {
+		return "", err
+	}
+	return string(b), nil
+}
+
+// MapToStr 对map按照字典顺序排序 并返回字符串 对value是对象 map list 类型的key 过滤掉
+func MapToStrSkipObject(data map[string]interface{}, key ...string) (string, error) {
+	if len(data) == 0 {
+		return "", errors.New("data is nil or empty")
+	}
+	newData := make(map[string]interface{})
+	keys := make([]string, 0, len(data))
+	for k := range data {
+		if sli.Contains(key, k) {
+			continue
+		}
+		t := reflect.TypeOf(data[k])
+		if t != nil {
+			tkind := t.Kind()
+			if tkind == reflect.Map || tkind == reflect.Slice || tkind == reflect.Array || tkind == reflect.Struct {
+				continue
+			}
+			keys = append(keys, k)
+		}
+	}
+	sort.Strings(keys)
+	for _, k := range keys {
+		newData[k] = data[k]
+	}
+	b, err := json.Marshal(newData)
+	if err != nil {
+		return "", err
+	}
+	return string(b), nil
+}
+
+// JSON2Struct json转struct
+func JSON2Struct(str string, obj interface{}) error {
+	return json.Unmarshal([]byte(str), &obj)
+}
+
+// JSONArray2Struct json转struct
+func JSONArray2Struct(str []string, obj interface{}) []interface{} {
+	data := make([]interface{}, len(str))
+	for i, v := range str {
+		_ = JSON2Struct(v, &obj)
+		data[i] = obj
+	}
+	return data
+}
+
+// JSON2Map json转map
+func JSON2Map(str string) (map[string]interface{}, error) {
+	var mapResult map[string]interface{}
+	return mapResult, json.Unmarshal([]byte(str), &mapResult)
+}
+
+// StructToStrNormal 结构体转str
+func StructToStrNormal(obj interface{}) (string, error) {
+	str, err := json.Marshal(obj)
+	if err != nil {
+		return "", err
+	}
+	return string(str), nil
+}
+
+func UrlValueToStr(values url.Values, exclude string) (string, string) {
+	if values == nil {
+		return "", ""
+	}
+	var buf bytes.Buffer
+	var sign string
+	keys := make([]string, 0, len(values))
+	for k := range values {
+		if k == exclude {
+			sign = strings.Join(values[k], "")
+			continue
+		}
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	for i, k := range keys {
+		if i != 0 {
+			buf.WriteString("&")
+		}
+		buf.WriteString(k)
+		buf.WriteString("=")
+		buf.WriteString(strings.Join(values[k], ""))
+	}
+	return buf.String(), sign
+}
+
+// 对参数进行排序后 拼接成url字符串 只对一级字符串类型的参数做处理
+func MapToUrlOnlyStr(data map[string]interface{}) string {
+	if len(data) == 0 {
+		return ""
+	}
+	var buf bytes.Buffer
+	keys := make([]string, len(data))
+	i := 0
+	for k := range data {
+		keys[i] = k
+		i++
+	}
+	sort.Strings(keys)
+	for i, k := range keys {
+		if i != 0 {
+			buf.WriteString("&")
+		}
+		buf.WriteString(k)
+		buf.WriteString("=")
+		if v, ok := data[k].(string); ok {
+			buf.WriteString(v)
+		}
+	}
+	return buf.String()
+}
+
+// MapToStr 对map按照字典顺序排序 并返回字符串url 拼接的字段
+func MapToUrlStr(data map[string]interface{}) string {
+	if len(data) == 0 {
+		return ""
+	}
+	var buf bytes.Buffer
+	keys := make([]string, len(data))
+	i := 0
+	for k := range data {
+		keys[i] = k
+		i++
+	}
+	sort.Strings(keys)
+	for i, k := range keys {
+		if i != 0 {
+			buf.WriteString("&")
+		}
+		buf.WriteString(k)
+		buf.WriteString("=")
+		if v, ok := data[k].(string); ok {
+			buf.WriteString(v)
+			continue
+		}
+		t := reflect.TypeOf(data[k])
+		if t != nil && t.Kind() == reflect.Map {
+			if v, ok := data[k].(map[string]interface{}); ok {
+				buf.WriteString("{")
+				str := MapToUrlStr(v)
+				buf.WriteString(str)
+				buf.WriteString("}")
+			}
+		}
+		if t != nil && (t.Kind() == reflect.Slice || t.Kind() == reflect.Array) {
+			arraybyte, _ := json.Marshal(data[k])
+			buf.WriteString(string(arraybyte))
+		}
+	}
+	return buf.String()
+}
+
+// MapToURL 集合转URL
+func MapToURL(m map[string]string) string {
+	if len(m) == 0 {
+		return ""
+	}
+	v := url.Values{}
+	for k := range m {
+		v.Set(k, string(m[k]))
+	}
+	return v.Encode()
+}
+
+func Strcut2UrlValue(obj interface{}) (string, error) {
+	t := reflect.TypeOf(obj)
+	v := reflect.ValueOf(obj)
+	if t.Kind() != reflect.Struct {
+		return "", errors.New("obj must be struct type")
+	}
+	u := url.Values{}
+	for i := 0; i < t.NumField(); i++ {
+		var value string
+		tag := t.Field(i).Tag.Get("json")
+		switch t.Field(i).Type.Kind() {
+		case reflect.String:
+			value = v.Field(i).String()
+		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+			value = strconv.Itoa(int(v.Field(i).Int()))
+		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+			value = strconv.FormatUint(v.Field(i).Uint(), 10)
+		case reflect.Slice, reflect.Array:
+			buf := bytes.Buffer{}
+			b, _ := json.Marshal(v.Field(i).Interface())
+			t := strings.TrimRight(strings.TrimLeft(string(b), "["), "]")
+			array := strings.Split(t, ",")
+			if len(array) == 0 {
+				value = ""
+			}
+			if len(array) == 1 {
+				value = array[0]
+			} else {
+				for i, v := range array {
+					if i == 0 {
+						buf.WriteString(v)
+						continue
+					}
+					buf.WriteString("&")
+					buf.WriteString(tag)
+					buf.WriteString("=")
+					buf.WriteString(v)
+					value = buf.String()
+				}
+			}
+		}
+		u.Add(tag, value)
+	}
+	dcodeurl, err := url.QueryUnescape(u.Encode())
+	return dcodeurl, err
+}
+
+// StrToMd5 字符串转md5
+func StrToMd5(str string) string {
+	data := []byte(str)
+	return ByteToMd5(data)
+}
+
+// ByteToMd5 数组转md5
+func ByteToMd5(data []byte) string {
+	md5Ctx := md5.New()
+	md5Ctx.Write(data)
+	cipherStr := md5Ctx.Sum(nil)
+	return hex.EncodeToString(cipherStr)
+}
+
+// FileToMd5 文件转MD5
+func FileToMd5(fileName string) string {
+	file, err := os.Open(fileName)
+	if err != nil {
+		return ""
+	}
+	//defer file.Close()
+	md5Ctx := md5.New()
+	if _, err := io.Copy(md5Ctx, file); err != nil {
+		return ""
+	}
+	cipherStr := md5Ctx.Sum(nil)
+	return hex.EncodeToString(cipherStr)
+}
+
+// HashCode  对一个字符串生成唯一的hasHcode 码
+func HashCode(src string) int {
+	v := int(crc32.ChecksumIEEE([]byte(src)))
+	if v < 0 {
+		return -v
+	}
+	return v
+}
+
+// HexToString converts
+func HexToString(data []byte) string {
+	return hex.EncodeToString(data)
+}
+
+// StrToSha256 字符串转sha256
+func StrToSha256(str string) string {
+	shaCtx := sha256.New()
+	shaCtx.Write([]byte(str))
+	shaBytes := shaCtx.Sum(nil)
+	cipherStr := hex.EncodeToString(shaBytes[:])
+	return cipherStr
+}
+
+// StrToSha1 字符串转sha1
+func StrToSha1(str string, secret string) []byte {
+	h := hmac.New(sha1.New, []byte(secret))
+	h.Write([]byte(str))
+	return h.Sum(nil)
+}
+
+// StrToSha1 字符串转sha1 转16进制后
+func StrToHmacSha1(str, secret string) string {
+	return hex.EncodeToString(StrToSha1(str, secret))
+}
+
+// StrToHmacSha256 加密 字符串转sha256加密字符串
+func StrToHmacSha256(str string, secret string) string {
+	h := hmac.New(sha256.New, []byte(secret))
+	h.Write([]byte(str))
+	cipherStr := hex.EncodeToString(h.Sum(nil))
+	return cipherStr
+}
+
+func PKCS7Padding(ciphertext []byte, blockSize int) []byte {
+	padding := blockSize - len(ciphertext)%blockSize
+	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
+	return append(ciphertext, padtext...)
+}
+
+func PKCS7UnPadding(origData []byte) []byte {
+	length := len(origData)
+	unpadding := int(origData[length-1])
+	return origData[:(length - unpadding)]
+}
+
+// AesEncrypt AES加密
+func AesEncrypt(origData, key string) ([]byte, error) {
+	origDataByte := []byte(origData)
+	return CoreAesEncrypt(origDataByte, key)
+}
+
+// AesDecrypt AES解密
+func AesDecrypt(crypted, key string) (string, error) {
+	cryptedByte := []byte(crypted)
+	return CoreAesDecrypt(cryptedByte, key)
+}
+
+// CoreAesEncrypt AES加密
+func CoreAesEncrypt(origData []byte, key string) ([]byte, error) {
+	keybyte := []byte(key)
+	block, err := aes.NewCipher(keybyte)
+	if err != nil {
+		return nil, err
+	}
+	blockSize := block.BlockSize()
+	origData = PKCS7Padding(origData, blockSize)
+	blockMode := cipher.NewCBCEncrypter(block, keybyte[:blockSize])
+	crypted := make([]byte, len(origData))
+	blockMode.CryptBlocks(crypted, origData)
+	return crypted, nil
+}
+
+// https://core.telegram.org/api/end-to-end#sending-and-receiving-messages-in-a-secret-chat
+func CoreAesEncryptEx(plain []byte, nonceLen int, key string) ([]byte, error) {
+	nonce := make([]byte, nonceLen)
+	_, err := io.ReadFull(rand.Reader, nonce)
+	if err != nil {
+		return nil, err
+	}
+	var largeShaRaw []byte
+	largeShaRaw = append(largeShaRaw, []byte(key)...)
+	largeShaRaw = append(largeShaRaw, nonce...)
+	largeShaRawMid := len(largeShaRaw) / 2
+	msgKeyLarge := sha256.Sum256(largeShaRaw)
+	msgKey := msgKeyLarge[8:24] //16 bytes
+
+	var shaRawA []byte
+	shaRawA = append(shaRawA, msgKey...)
+	shaRawA = append(shaRawA, largeShaRaw[:largeShaRawMid]...)
+	sha256a := sha256.Sum256(shaRawA) //32 bytes
+
+	var shaRawB []byte
+	shaRawB = append(shaRawB, largeShaRaw[largeShaRawMid:]...)
+	shaRawB = append(shaRawB, msgKey...)
+	sha256b := sha256.Sum256(shaRawB) //32 bytes
+
+	var aesKey []byte                          //32 bytes AES-256
+	aesKey = append(aesKey, sha256a[:8]...)    //a: 8 bytes
+	aesKey = append(aesKey, sha256b[8:24]...)  //b: 16 bytes
+	aesKey = append(aesKey, sha256a[24:32]...) //a: 8 bytes
+
+	var aesIV []byte                         // 16 bytes
+	aesIV = append(aesIV, sha256b[:4]...)    //b: 4 bytes
+	aesIV = append(aesIV, sha256a[12:20]...) //a: 8 bytes
+	aesIV = append(aesIV, sha256b[28:]...)   //b: 4 bytes
+
+	block, err := aes.NewCipher(aesKey)
+	if err != nil {
+		return nil, err
+	}
+	blockSize := block.BlockSize()
+	ciphertext := PKCS7Padding(plain, blockSize)
+	mode := cipher.NewCBCEncrypter(block, aesIV)
+	cipher := make([]byte, nonceLen+len(ciphertext))
+	copy(cipher, nonce)
+	mode.CryptBlocks(cipher[nonceLen:], ciphertext)
+	return cipher, nil
+}
+
+// CoreAesDecryptEx 是 CoreAesEncryptEx 的逆运算。
+// 入参 crypt 前 nonceLen 字节为随机 nonce，其余为 CBC 密文；密钥派生与加密端完全一致。
+// 由于 crypt 可能来自不可信输入（如客户端伪造的票据），这里对长度和分组边界做了保护，避免切片或 CBC 解密 panic。
+func CoreAesDecryptEx(crypt []byte, nonceLen int, key string) ([]byte, error) {
+	if nonceLen < 0 || len(crypt) < nonceLen {
+		return nil, errors.New("CoreAesDecryptEx: ciphertext shorter than nonce")
+	}
+	nonce := make([]byte, nonceLen)
+	copy(nonce, crypt)
+	var largeShaRaw []byte
+	largeShaRaw = append(largeShaRaw, []byte(key)...)
+	largeShaRaw = append(largeShaRaw, nonce...)
+	largeShaRawMid := len(largeShaRaw) / 2
+	msgKeyLarge := sha256.Sum256(largeShaRaw)
+	msgKey := msgKeyLarge[8:24] //16 bytes
+
+	var shaRawA []byte
+	shaRawA = append(shaRawA, msgKey...)
+	shaRawA = append(shaRawA, largeShaRaw[:largeShaRawMid]...)
+	sha256a := sha256.Sum256(shaRawA) //32 bytes
+
+	var shaRawB []byte
+	shaRawB = append(shaRawB, largeShaRaw[largeShaRawMid:]...)
+	shaRawB = append(shaRawB, msgKey...)
+	sha256b := sha256.Sum256(shaRawB) //32 bytes
+
+	var aesKey []byte                          //32 bytes AES-256
+	aesKey = append(aesKey, sha256a[:8]...)    //a: 8 bytes
+	aesKey = append(aesKey, sha256b[8:24]...)  //b: 16 bytes
+	aesKey = append(aesKey, sha256a[24:32]...) //a: 8 bytes
+
+	var aesIV []byte                         // 16 bytes
+	aesIV = append(aesIV, sha256b[:4]...)    //b: 4 bytes
+	aesIV = append(aesIV, sha256a[12:20]...) //a: 8 bytes
+	aesIV = append(aesIV, sha256b[28:]...)   //b: 4 bytes
+
+	block, err := aes.NewCipher(aesKey)
+	if err != nil {
+		return nil, err
+	}
+	realData := crypt[nonceLen:]
+	blockSize := block.BlockSize()
+	if len(realData) == 0 || len(realData)%blockSize != 0 {
+		return nil, errors.New("CoreAesDecryptEx: ciphertext is not a multiple of block size")
+	}
+	blockMode := cipher.NewCBCDecrypter(block, aesIV)
+	origData := make([]byte, len(realData))
+	blockMode.CryptBlocks(origData, realData)
+	// 用带校验的 PKCS7 去填充：错误密钥/损坏数据几乎必然产生非法填充，这里返回错误而非 panic，
+	// 也顺带充当一次完整性校验(共享的 PKCS7UnPadding 在非法填充时会越界 panic，故不复用)。
+	return pkcs7UnpadSafe(origData, blockSize)
+}
+
+// pkcs7UnpadSafe 校验并剥离 PKCS7 填充，非法填充返回错误而不 panic。
+func pkcs7UnpadSafe(data []byte, blockSize int) ([]byte, error) {
+	length := len(data)
+	if length == 0 || length%blockSize != 0 {
+		return nil, errors.New("invalid PKCS7 padding: bad length")
+	}
+	pad := int(data[length-1])
+	if pad <= 0 || pad > blockSize || pad > length {
+		return nil, errors.New("invalid PKCS7 padding: bad size")
+	}
+	for _, b := range data[length-pad:] {
+		if int(b) != pad {
+			return nil, errors.New("invalid PKCS7 padding: inconsistent bytes")
+		}
+	}
+	return data[:length-pad], nil
+}
+
+// CoreAesDecrypt AES解密
+func CoreAesDecrypt(crypted []byte, key string) (s string, err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			err = fmt.Errorf("CoreAesDecrypt is panic. crypted:%s,key:%s", string(crypted), key)
+			return
+		}
+	}()
+	keybyte := []byte(key)
+	block, err := aes.NewCipher(keybyte)
+	if err != nil {
+		return "", err
+	}
+	blockSize := block.BlockSize()
+	if blockSize < 0 {
+		return "", errors.New("blockSize less than zero")
+	}
+	blockMode := cipher.NewCBCDecrypter(block, keybyte[:blockSize])
+	origData := make([]byte, len(crypted))
+	blockMode.CryptBlocks(origData, crypted)
+	origData = PKCS7UnPadding(origData)
+	return string(origData), nil
+}
+
+// XorEnc
+func XorEnc(src string, xorKey string) string {
+	var result string
+	j := 0
+	bt := []rune(src)
+	xor := []rune(xorKey)
+	for i := 0; i < len(bt); i++ {
+		s := strconv.FormatInt(int64(bt[i]^xor[j]), 10)
+		result = result + s
+		j = 1 % len(xor)
+	}
+	return result
+}
+
+// XorDec
+func XorDec(src string, xorKey string) string {
+	var result string
+	j := 0
+	bt := []rune(src)
+	xor := []rune(xorKey)
+	for i := 0; i < len(bt); i++ {
+		s := strconv.FormatInt(int64(bt[i]^xor[j]), 10)
+		result = result + s
+		j = i % len(xor)
+	}
+	return result
+}
+
+func XorDecode(src, key string) string {
+	srcByte, _ := base64.StdEncoding.DecodeString(src)
+	keyByte, _ := base64.StdEncoding.DecodeString(key)
+	srcByte = xor(srcByte, keyByte)
+	return base64.StdEncoding.EncodeToString(srcByte)
+}
+
+func XorEncode(src, key string) string {
+	return XorDecode(src, key)
+}
+
+func xor(src []byte, key []byte) []byte {
+	for i := 0; i < len(src); i++ {
+		src[i] ^= key[i%len(key)]
+	}
+	return src
+}
+
+func XORLength(src []byte, key []byte, length int) []byte {
+	for i := 0; i < length; i++ {
+		src[i] ^= key[i%len(key)]
+	}
+	return src[:length]
+}
+
+// ECB PKCS5 加密
+func AESECBEncrypt(src, key []byte) []byte {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		fmt.Printf("txn put fail: %v", err)
+		return nil
+	}
+	ecbMod := ecb.NewECBEncrypter(block)
+	content := PKCS5Padding(src, block.BlockSize())
+	des := make([]byte, len(content))
+	ecbMod.CryptBlocks(des, content)
+	return des
+}
+
+// ECB PKCS5 解密
+func AESECBDecrypt(encrypted, key []byte) []byte {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		fmt.Printf("decrypt fail: %v", err)
+		return nil
+	}
+
+	ecbMod := ecb.NewECBDecrypter(block)
+	des := make([]byte, len(encrypted))
+	ecbMod.CryptBlocks(des, encrypted)
+
+	// 去除 PKCS5 填充
+	result := PKCS5UnPadding(des)
+	return result
+}
+
+// PKCS5UnPadding
+func PKCS5UnPadding(origData []byte) []byte {
+	length := len(origData)
+	// 去掉最后一个字节 unpadding 次
+	unpadding := int(origData[length-1])
+	if unpadding > length {
+		return origData
+	}
+	return origData[:(length - unpadding)]
+}
+
+// PKCS5Padding
+func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
+	padding := blockSize - len(ciphertext)%blockSize
+	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
+	return append(ciphertext, padtext...)
+}
+
+// 加密
+func AESCBCPck5Encrypt(origData, key []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	blockSize := block.BlockSize()
+	origData = PKCS5Padding(origData, blockSize)
+	blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
+	crypted := make([]byte, len(origData))
+	blockMode.CryptBlocks(crypted, origData)
+	return crypted, nil
+}
+
+// base64补全
+func padding(origin string) string {
+	missing := len(origin) % 4
+	if missing != 0 {
+		origin += strings.Repeat("=", 4-missing)
+	}
+
+	return origin
+}
+
+// AdDecrypt 集团广告中心-广告数据解密专用
+func AdDecrypt(encryptedData, keyBase64 string) (res string, err error) {
+	// 1. Base64 解码获取密钥
+	keyBytes, err := base64.StdEncoding.DecodeString(padding(keyBase64))
+	if err != nil {
+		return "", fmt.Errorf("密钥 Base64 解码失败: %v", err)
+	}
+	// 2. Base64 解码获取加密数据
+	data, err := base64.StdEncoding.DecodeString(padding(encryptedData))
+	if err != nil {
+		return "", fmt.Errorf("数据 Base64 解码失败: %v", err)
+	}
+
+	// 3. 拆分 IV 与密文（前 12 字节为 IV）
+	if len(data) < 12 {
+		return "", errors.New("数据长度不足，无法提取 IV")
+	}
+	iv := data[:12]
+	ciphertext := data[12:]
+	// 4. 初始化 AES 密码块
+	block, err := aes.NewCipher(keyBytes)
+	if err != nil {
+		return "", fmt.Errorf("创建 AES 密码块失败: %v", err)
+	}
+	// 5. 采用 GCM 模式
+	aesGCM, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", fmt.Errorf("创建 GCM 失败: %v", err)
+	}
+	// 6. 解密数据
+	plainText, err := aesGCM.Open(nil, iv, ciphertext, nil)
+	if err != nil {
+		return "", fmt.Errorf("解密失败: %v", err)
+	}
+
+	return string(plainText), nil
+}