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a question on SSH_MSG_KEXDH_INIT message



Hi, all
    This is a simple question. When I was trying to implement ssh client side, I sent out SSH_MSG_KEXDH_INIT message without any MAC. I got error message back from server:
"Packet integrity error". Why?
    Do I need to append MAC at the end of the SSH_MSG_KEXDH_INIT message? If so, what is used as key for the MAC? (key exchange has not finished)
 
thanks,
lu


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