初始化

API/internal/security/encryption.go

@@ -0,0 +1,57 @@
+package security
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/base64"
+	"errors"
+	"io"
+)
+
+type Encryptor struct{ key []byte }
+
+func NewEncryptor(encodedKey string) (*Encryptor, error) {
+	key, err := base64.StdEncoding.DecodeString(encodedKey)
+	if err != nil || len(key) != 32 {
+		return nil, errors.New("CONFIG_ENCRYPTION_KEY 必须是 32 字节随机值的 Base64 编码")
+	}
+	return &Encryptor{key: key}, nil
+}
+
+func (e *Encryptor) Encrypt(plain 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
+	}
+	sealed := gcm.Seal(nonce, nonce, []byte(plain), nil)
+	return base64.RawStdEncoding.EncodeToString(sealed), nil
+}
+
+func (e *Encryptor) Decrypt(encoded string) (string, error) {
+	data, err := base64.RawStdEncoding.DecodeString(encoded)
+	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
+	}
+	if len(data) < gcm.NonceSize() {
+		return "", errors.New("密文无效")
+	}
+	plain, err := gcm.Open(nil, data[:gcm.NonceSize()], data[gcm.NonceSize():], nil)
+	return string(plain), err
+}