diff --git a/encrypt.cpp b/encrypt.cpp
index 055a8bb..d6dd96c 100755
--- a/encrypt.cpp
+++ b/encrypt.cpp
@@ -48,8 +48,8 @@ int my_encrypt(const char *data0,char *output,int &len,char * key)
 
 	if(len>65535) return -1;
 
-	data[len-16-2]=(uint16_t(ori_len))>>8;
-	data[len-16-1]=((uint16_t(ori_len))<<8)>>8;
+	data[len-16-2]= (unsigned char)( (uint16_t(ori_len))>>8);
+	data[len-16-1]=(unsigned char)( ((uint16_t(ori_len))<<8)>>8) ;
 
 
 	//printf("%d %d\n",data[len-16-2],data[len-16-1]);
@@ -108,7 +108,7 @@ int my_decrypt(const char *data0,char *output,int &len,char * key)
 		return -2;
 	}
 
-	len=output[len-16-2]*256u+output[len-16-1];
+	len=((unsigned char)output[len-16-2])*256u+((unsigned char)output[len-16-1]);  //this may be broken because of sign
 
 	return 0;
 }
diff --git a/main.cpp b/main.cpp
index 581c4b6..cd39d62 100755
--- a/main.cpp
+++ b/main.cpp
@@ -1897,6 +1897,9 @@ int recv_safer(packet_info_t &info,char* &data,int &len)
 		return -1;
 	}
 
+
+	//printf("recv _len %d\n ",recv_len);
+
 	//printf("222222222222222\n");
 
 
@@ -1917,12 +1920,14 @@ int recv_safer(packet_info_t &info,char* &data,int &len)
 		return -1;
 	}
 
-	data=recv_data_buf+sizeof(anti_replay_seq_t)+sizeof(id_t)*2;;
+	//printf("recv _len %d\n ",recv_len);
+	data=recv_data_buf+sizeof(anti_replay_seq_t)+sizeof(id_t)*2;
 	len=recv_len-(sizeof(anti_replay_seq_t)+sizeof(id_t)*2  );
 
+
 	if(len<0)
 	{
-		printf("len <0\n");
+		printf("len <0 ,%d\n",len);
 		return -1;
 	}