96 lines
1.9 KiB
Go
96 lines
1.9 KiB
Go
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package security
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/base64"
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"errors"
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"io"
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"strings"
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)
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// Encryption 加密工具
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type Encryption struct {
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key []byte
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}
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// NewEncryption 创建加密工具（密钥长度必须是16, 24或32字节）
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func NewEncryption(key string) (*Encryption, error) {
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if len(key) != 16 && len(key) != 24 && len(key) != 32 {
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return nil, errors.New("key length must be 16, 24 or 32 bytes")
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}
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return &Encryption{key: []byte(key)}, nil
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}
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// Encrypt 使用AES-256-GCM加密
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func (e *Encryption) Encrypt(plaintext string) (string, error) {
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block, err := aes.NewCipher(e.key)
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
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return "", err
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}
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ciphertext := gcm.Seal(nonce, nonce, []byte(plaintext), nil)
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return base64.StdEncoding.EncodeToString(ciphertext), nil
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}
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// Decrypt 使用AES-256-GCM解密
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func (e *Encryption) Decrypt(ciphertext string) (string, error) {
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data, err := base64.StdEncoding.DecodeString(ciphertext)
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if err != nil {
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return "", err
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}
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block, err := aes.NewCipher(e.key)
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonceSize := gcm.NonceSize()
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if len(data) < nonceSize {
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return "", errors.New("ciphertext too short")
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}
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nonce, cipherData := data[:nonceSize], data[nonceSize:]
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plaintext, err := gcm.Open(nil, nonce, cipherData, nil)
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if err != nil {
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return "", err
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}
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return string(plaintext), nil
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}
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// MaskEmail 邮箱脱敏
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func MaskEmail(email string) string {
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if email == "" {
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return ""
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}
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prefix := email[:3]
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suffix := email[strings.Index(email, "@"):]
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return prefix + "***" + suffix
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}
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// MaskPhone 手机号脱敏
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func MaskPhone(phone string) string {
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if len(phone) != 11 {
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return phone
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}
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return phone[:3] + "****" + phone[7:]
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}
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