96 lines
2.0 KiB
Go
96 lines
2.0 KiB
Go
package utils
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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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"crypto/sha256"
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"encoding/base64"
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"errors"
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"io"
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"os"
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"strings"
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)
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// defaultAESKey 必须精确为 16/24/32 字节；此处为 AES-256（32 字节）
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var defaultAESKey = []byte("art-code-blog-aes256-key-32b!!!!") // len == 32
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// 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
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func GetAESKey() []byte {
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key := strings.TrimSpace(os.Getenv("AES_ENCRYPTION_KEY"))
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if key == "" {
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return normalizeAESKey(defaultAESKey)
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}
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return normalizeAESKey([]byte(key))
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}
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func normalizeAESKey(key []byte) []byte {
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switch len(key) {
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case 16, 24, 32:
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return key
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default:
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sum := sha256.Sum256(key)
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out := make([]byte, 32)
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copy(out, sum[:])
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return out
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}
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}
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// EncryptAES 使用AES-256-GCM加密数据
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func EncryptAES(plaintext string) (string, error) {
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key := GetAESKey()
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", err
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}
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aesGCM, 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, aesGCM.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 := aesGCM.Seal(nonce, nonce, []byte(plaintext), nil)
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return base64.StdEncoding.EncodeToString(ciphertext), nil
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}
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// DecryptAES 使用AES-256-GCM解密数据
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func DecryptAES(encrypted string) (string, error) {
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key := GetAESKey()
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ciphertext, err := base64.StdEncoding.DecodeString(encrypted)
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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(key)
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if err != nil {
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return "", err
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}
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aesGCM, 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 := aesGCM.NonceSize()
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if len(ciphertext) < nonceSize {
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return "", errors.New("ciphertext too short")
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}
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nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
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plaintext, err := aesGCM.Open(nil, nonce, ciphertext, 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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