diff --git a/app/src/main/java/com/idormy/sms/forwarder/server/component/AppMessageConverter.kt b/app/src/main/java/com/idormy/sms/forwarder/server/component/AppMessageConverter.kt
index 36c222c4..d6b2e555 100644
--- a/app/src/main/java/com/idormy/sms/forwarder/server/component/AppMessageConverter.kt
+++ b/app/src/main/java/com/idormy/sms/forwarder/server/component/AppMessageConverter.kt
@@ -75,7 +75,7 @@ class AppMessageConverter : MessageConverter {
                 throw HttpException(500, "服务端未配置SM4密钥")
             }
 
-            val sm4Key = ConvertTools.hexStringToByteArray(HttpServerUtils.clientSignKey.toString())
+            val sm4Key = ConvertTools.hexStringToByteArray(HttpServerUtils.serverSm4Key.toString())
             val encryptCBC = ConvertTools.hexStringToByteArray(json)
             val decryptCBC = SM4Crypt.decrypt(encryptCBC, sm4Key)
             //json = String(Base64.decode(decryptCBC.toString()))