请教一下华为光猫固件里的signature签名是如何封装的或者升级版本时绕过signature签名
我的软件版本是V300R017C10SPC125修改了升级包，对所有校验的地方重新计算。但是在升级时这个signature签名通不过，有256个字节的校验信息不知道如何计算的。
<SWM>Verify Signature hash ERROR!Real=,Verify=
<SWM>HW_SWM_PacketErrorParse ERROR!uiReturn = 0xf720404e
<SWM>HW_SWM_LoadThread End While!uiState=1,process=0%
<SWM>HW_SWM_StopRcv!uiPara=0xf720404e
<SWM>Start join recv thread!
<SWM>HW_SWM_StopRcv!uiPara=0xf7204028
<SWM>HW_SWM_StopRcv!uiPara=0xf7204028
<SWM>Set Load Failed!
<SWM>receive thread. olt crc:
<SWM>HW_SWM_ReceiveThread Exit!uiRet=0xf7204028
<SWM>Set Load Failed!
Killed
<SWM>End join recv thread!
<SWM>uiResult=
<SWM>uiResult=
<SWM>Before:ProcLen=,RecvLen=
<SWM>After:ProcLen=,RecvLen=
Load TimeOut AlarmID: 104058
<SWM>Exit Load Ctrl!!!!
<SWM>Set uiFsmState to 0!
SWM UPGRATED:
HW_SWM_PDT_IsLoadRoofs Called
<SWM>HW_SWM_LoadThread End While!uiRet=0xf720404e
<SWM>HW_SWM_Notify Notify by Mid_19 Err_0xf720404e
<SWM>
<SWM>receive olt crc:
<SWM>Set Load Failed!
<SWM>HW_SWM_StopRcv!uiPara=0xf720404e
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