feat: backend core - auth, user, role, permission, device, webhook, monitoring, cache, repository, service, middleware, API handlers

internal/security/encryption.go

@@ -0,0 +1,95 @@
+package security
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/base64"
+	"errors"
+	"io"
+	"strings"
+)
+
+// Encryption 加密工具
+type Encryption struct {
+	key []byte
+}
+
+// NewEncryption 创建加密工具（密钥长度必须是16, 24或32字节）
+func NewEncryption(key string) (*Encryption, error) {
+	if len(key) != 16 && len(key) != 24 && len(key) != 32 {
+		return nil, errors.New("key length must be 16, 24 or 32 bytes")
+	}
+	return &Encryption{key: []byte(key)}, nil
+}
+
+// Encrypt 使用AES-256-GCM加密
+func (e *Encryption) Encrypt(plaintext string) (string, error) {
+	block, err := aes.NewCipher(e.key)
+	if err != nil {
+		return "", err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", err
+	}
+
+	nonce := make([]byte, gcm.NonceSize())
+	if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
+		return "", err
+	}
+
+	ciphertext := gcm.Seal(nonce, nonce, []byte(plaintext), nil)
+	return base64.StdEncoding.EncodeToString(ciphertext), nil
+}
+
+// Decrypt 使用AES-256-GCM解密
+func (e *Encryption) Decrypt(ciphertext string) (string, error) {
+	data, err := base64.StdEncoding.DecodeString(ciphertext)
+	if err != nil {
+		return "", err
+	}
+
+	block, err := aes.NewCipher(e.key)
+	if err != nil {
+		return "", err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", err
+	}
+
+	nonceSize := gcm.NonceSize()
+	if len(data) < nonceSize {
+		return "", errors.New("ciphertext too short")
+	}
+
+	nonce, cipherData := data[:nonceSize], data[nonceSize:]
+	plaintext, err := gcm.Open(nil, nonce, cipherData, nil)
+	if err != nil {
+		return "", err
+	}
+
+	return string(plaintext), nil
+}
+
+// MaskEmail 邮箱脱敏
+func MaskEmail(email string) string {
+	if email == "" {
+		return ""
+	}
+	
+	prefix := email[:3]
+	suffix := email[strings.Index(email, "@"):]
+	return prefix + "***" + suffix
+}
+
+// MaskPhone 手机号脱敏
+func MaskPhone(phone string) string {
+	if len(phone) != 11 {
+		return phone
+	}
+	return phone[:3] + "****" + phone[7:]
+}