阿里云OSS设置

server/utils/encrypt.go

@@ -4,51 +4,59 @@ import (
 	"crypto/aes"
 	"crypto/cipher"
 	"crypto/rand"
+	"crypto/sha256"
 	"encoding/base64"
 	"errors"
 	"io"
+	"os"
+	"strings"
 )
 
-// AESKey 从环境变量或配置中获取，这里使用默认密钥（生产环境应该从配置读取）
-var defaultAESKey = []byte("your-32-byte-secret-key-here!!") // 32 bytes for AES-256
+// defaultAESKey 必须精确为 16/24/32 字节；此处为 AES-256（32 字节）
+var defaultAESKey = []byte("art-code-blog-aes256-key-32b!!!!") // len == 32
 
-// GetAESKey 获取AES密钥（应该从配置文件或环境变量读取）
+// GetAESKey 获取 AES 密钥：优先 AES_ENCRYPTION_KEY，否则使用默认密钥；长度非法时用 SHA-256 规范化为 32 字节
 func GetAESKey() []byte {
-	// TODO: 从配置文件或环境变量读取密钥
-	// key := os.Getenv("AES_ENCRYPTION_KEY")
-	// if key == "" {
-	//     return defaultAESKey
-	// }
-	// return []byte(key)
-	return defaultAESKey
+	key := strings.TrimSpace(os.Getenv("AES_ENCRYPTION_KEY"))
+	if key == "" {
+		return normalizeAESKey(defaultAESKey)
+	}
+	return normalizeAESKey([]byte(key))
+}
+
+func normalizeAESKey(key []byte) []byte {
+	switch len(key) {
+	case 16, 24, 32:
+		return key
+	default:
+		sum := sha256.Sum256(key)
+		out := make([]byte, 32)
+		copy(out, sum[:])
+		return out
+	}
 }
 
 // EncryptAES 使用AES-256-GCM加密数据
 func EncryptAES(plaintext string) (string, error) {
 	key := GetAESKey()
 
-	// Create cipher block
 	block, err := aes.NewCipher(key)
 	if err != nil {
 		return "", err
 	}
 
-	// Create GCM
 	aesGCM, err := cipher.NewGCM(block)
 	if err != nil {
 		return "", err
 	}
 
-	// Create nonce
 	nonce := make([]byte, aesGCM.NonceSize())
 	if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
 		return "", err
 	}
 
-	// Encrypt
 	ciphertext := aesGCM.Seal(nonce, nonce, []byte(plaintext), nil)
 
-	// Encode to base64
 	return base64.StdEncoding.EncodeToString(ciphertext), nil
 }
 
@@ -56,25 +64,21 @@ func EncryptAES(plaintext string) (string, error) {
 func DecryptAES(encrypted string) (string, error) {
 	key := GetAESKey()
 
-	// Decode from base64
 	ciphertext, err := base64.StdEncoding.DecodeString(encrypted)
 	if err != nil {
 		return "", err
 	}
 
-	// Create cipher block
 	block, err := aes.NewCipher(key)
 	if err != nil {
 		return "", err
 	}
 
-	// Create GCM
 	aesGCM, err := cipher.NewGCM(block)
 	if err != nil {
 		return "", err
 	}
 
-	// Extract nonce
 	nonceSize := aesGCM.NonceSize()
 	if len(ciphertext) < nonceSize {
 		return "", errors.New("ciphertext too short")
@@ -82,7 +86,6 @@ func DecryptAES(encrypted string) (string, error) {
 
 	nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
 
-	// Decrypt
 	plaintext, err := aesGCM.Open(nil, nonce, ciphertext, nil)
 	if err != nil {
 		return "", err