增加vendor

vendor/github.com/go-pay/gopay/pkg/aes/aes_gcm.go

@@ -0,0 +1,49 @@
+package aes
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"fmt"
+
+	"github.com/go-pay/gopay/pkg/util"
+)
+
+// AES-GCM 加密数据
+func GCMEncrypt(originText, additional, key []byte) (nonce []byte, cipherText []byte, err error) {
+	return gcmEncrypt(originText, additional, key)
+}
+
+// AES-GCM 解密数据
+func GCMDecrypt(cipherText, nonce, additional, key []byte) ([]byte, error) {
+	return gcmDecrypt(cipherText, nonce, additional, key)
+}
+
+func gcmDecrypt(secretData, nonce, additional, key []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return nil, fmt.Errorf("cipher.NewGCM(),error:%w", err)
+	}
+	originByte, err := gcm.Open(nil, nonce, secretData, additional)
+	if err != nil {
+		return nil, err
+	}
+	return originByte, nil
+}
+
+func gcmEncrypt(originText, additional, key []byte) ([]byte, []byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, nil, err
+	}
+	nonce := []byte(util.RandomString(12))
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return nil, nil, fmt.Errorf("cipher.NewGCM(),error:%w", err)
+	}
+	cipherBytes := gcm.Seal(nil, nonce, originText, additional)
+	return nonce, cipherBytes, nil
+}