!1 Merge back to master

Merge pull request !1 from dev branch

server/libs/encrypt/encrypter_hmac.go

@@ -0,0 +1,17 @@
+package encrypt
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/hex"
+)
+
+type HmacEncryptor struct {
+	Key []byte
+}
+
+func (encryptor *HmacEncryptor) Encrypt(content []byte) string {
+	mac := hmac.New(sha256.New, encryptor.Key)
+	mac.Write(content)
+	return hex.EncodeToString(mac.Sum(nil))
+}