theory.txt

单片机解密的书籍

		call send_cmd
		loop __nex_vc

		call end_pic
;--------------------------------------
		_printm	9,0,1eh,'Writing to file: DEX_PIC1.HEX'

		mov esi,bafer_1
		mov edi,bafer_6
		mov ecx,pic_size
		lea edx,file_1
		call baf_2_hex		;save in HEX 


		_printm 10,0,1eh,'Pass 2: R&W...'
;====================================== ;pass 2
		call start_pic

		mov bl,2
		call send_cmd		;Load data
		mov bx,3f80h
		call send_data
		mov bl,8
		call send_cmd		;Begin prog

		mov edi,bafer_2
		mov ecx,pic_size

;--------------------------------------
x__nex_vc:	mov bl,4		;Read data
		call send_cmd
		call read_data

		shr bx,1
		and bh,not 0c0h
		mov [edi],bx
		add edi,2
		mov bl,6
		call send_cmd		;Inc addr
		loop x__nex_vc

		call itime_h
		call end_pic
;--------------------------------------
		_printm	11,0,1eh,'Writing to file: DEX_PIC2.HEX'

		mov esi,bafer_2
		mov edi,bafer_6
		mov ecx,pic_size
		lea edx,file_2
		call baf_2_hex		;Save in HEX


		_printm 12,0,1eh,'Pass 3: Reading...'

;-------------------------------------- pass 3
		call itime_h
		call start_pic

		mov edi,bafer_3
		mov ecx,pic_size

xx__nex_vc:	mov bl,4
		call send_cmd
		call read_data

		shr bx,1
		and bh,not 0c0h
		mov [edi],bx
		add edi,2
		mov bl,6
		call send_cmd
		loop xx__nex_vc

		call end_pic

		_printm	13,0,1eh,'Writing to file: DEX_PIC3.HEX'

		mov esi,bafer_3
		mov edi,bafer_6
		mov ecx,pic_size
		lea edx,file_3
		call baf_2_hex

;======================================
		_printm	14,0,1eh,'Decoding...'

		xor edx,edx
		mov ecx,pic_size	
		mov esi,bafer_1
		mov ebx,bafer_3
		mov edi,bafer_4
		mov ebp,bafer_5

zre1:		mov ax,[ebx]

	       	cmp dword ptr brojac_1,40h
		jb nisu_isti

		push eax
		xor al,[esi]
		and al,40h
		pop eax
		jz isti_su


nisu_isti:	mov dx,ax
		not ax
		and ax,7fh
		xor dx,[esi]
		and dx,7fh
		shl ax,7
		or ax,dx
		stosw
		mov ax,-1
		jmp izl1

isti_su:	mov dx,ax
		not ax
		and ax,7fh
		xor dx,[esi]
		and dx,7fh
		shl ax,7
		or ax,dx
		stosw
		test ah,20h
		jnz nula_b
		or word ptr es:[edi-2],2040h
		and ax,not 2040h
		jmp izl1

nula_b:		or byte ptr es:[edi-1],20h
		and byte ptr es:[edi-2],not 40h
		or al,40h
		and ah,not 20h
		
izl1:		mov word ptr es:[ebp],ax
		add esi,2
		add ebx,2
		add ebp,2		
		inc dword ptr brojac_1
		loop zre1

;--------------------------------------
		_printm	15,0,1eh,'Writing to file: DEX_COD1.HEX'

		mov esi,bafer_4
		mov edi,bafer_6
		mov ecx,pic_size
		lea edx,file_4
		call baf_2_hex

		_printm	16,0,1eh,'Writing to file: DEX_COD2.HEX'

		mov esi,bafer_5
		mov edi,bafer_6
		mov ecx,pic_size
		lea edx,file_5
		call baf_2_hex
;======================================

		_printm	17,0,1eh,'Disassembling...'


		mov ecx,pic_size
		xor esi,esi
		mov edi,bafer_6

		lea ebx,info
		call copy_string
		dec edi

next_dis:	mov eax,brojac
		call ax_2_hex
		mov eax,'   :' 
		stosw
		inc dword ptr brojac
		
		mov ebx,bafer_1
		mov ax,word ptr [esi+ebx]
		call ax_2_hex
		mov ax,'  '
		stosw
		mov ebx,bafer_2
		mov ax,word ptr [esi+ebx]
		call ax_2_hex
		mov ax,'  '
		stosw
		mov ebx,bafer_3
		mov ax,word ptr [esi+ebx]
		call ax_2_hex
		mov eax,'    '
		stosd
		;stosw

		mov ebx,bafer_4
		mov ax,word ptr [esi+ebx]
		call ax_2_hex
		mov ax,'  '
		stosw

		push ecx
		push edi
		push esi
		lea esi,[esi+ebx]
		call decode
		pop esi
		mov eax,edi
		pop ecx
		sub eax,ecx
		mov ecx,25
		sub ecx,eax
		mov al,' '
		rep stosb

		mov ebx,bafer_5
		mov ax,word ptr [esi+ebx]
		cmp ax,-1
		je ok_oo

		call ax_2_hex
		mov ax,'  '
		stosw

		push esi
		lea esi,[esi+ebx]
		call decode
		pop esi
ok_oo:		mov ax,0a0dh
		stosw
		pop ecx
		add esi,2
		loop next_dis		
;--------------------------------------
		_printm	18,0,1eh,'Writing to file: DEX.LST'


		lea edx,file_6
		call createfile
		mov bx,ax

		mov ecx,edi
		mov edx,bafer_6
		sub ecx,edx
		call writefile
		call closefile

		_printm	19,0,1eh,'Done!'

		ret






ax_2_hex:	push eax 
		push eax
		mov al,ah
		call hexax
		xchg al,ah
		stosw
		pop eax
		call hexax
		xchg al,ah
		stosw
		pop eax
		ret





;--------------------------------------
start_pic:	mov dx,port_dx

		call mclr_0
		call itime
		call clk_0
		call data_0

		call itime_h
		call mclr_13
	
		call itime_h
		ret


;--------------------------------------
end_pic:	call mclr_0
		call itime_h
		call clk_3
		call data_3
		call itime_h
		ret

;--------------------------------------
read_data:	push ecx
		call itime
		mov ecx,16

_nex_cmds:	call clk_1
		call itime
		call clk_0

		inc dx
		in al,dx
		dec dx
		shr al,7	
		rcr bx,1

		call itime

		loop _nex_cmds

		call data_3

		call itime
		pop ecx
		ret

;--------------------------------------
send_data:	shl bx,1
		and bh,not 80h

send_data_16:	push ecx
		call itime
		mov ecx,16

		jmp nex_cmds

;--------------------------------------
send_cmd:	push ecx
		call clk_0
		call data_0

		call itime

		mov ecx,6

nex_cmds:	shr bx,1
		jc cm_o
		call data_0
		jmp cm_oo
cm_o:		call data_1
cm_oo:		

		call clk_1
		call itime
		call clk_0
		call itime

		loop nex_cmds

		call data_3

		call itime
		pop ecx
		ret

;---------------------------------------
clk_0:		and byte ptr port_x,0ddh
		mov al,byte ptr port_x
		out dx,al
		ret

clk_1:		and byte ptr port_x,0ddh
		or byte ptr port_x,2
		mov al,byte ptr port_x
		out dx,al
		ret


clk_3:		or byte ptr port_x,22h
		mov al,byte ptr port_x
		out dx,al
		ret
;---------------------------------------

data_0:		and byte ptr port_x,0fah
		mov al,byte ptr port_x
		out dx,al
		ret

data_1:		and byte ptr port_x,0fah
		or byte ptr port_x,1
		mov al,byte ptr port_x
		out dx,al
		ret

data_3:		or byte ptr port_x,5h
		mov al,byte ptr port_x
		out dx,al
		ret

;---------------------------------------
mclr_5:		and byte ptr port_x,0e7h
		mov al,byte ptr port_x
		out dx,al
		ret

mclr_0:		and byte ptr port_x,0e7h
		or byte ptr port_x,10h
		mov al,byte ptr port_x
		out dx,al
		ret

mclr_13:	and byte ptr port_x,0e7h
		or byte ptr port_x,8h
		mov al,byte ptr port_x
		out dx,al
		ret
;---------------------------------------



;--------------------------------------
itime:		push ecx
		mov ecx,400
		loop $
		pop ecx
		ret
;--------------------------------------
itime_h:	push ecx
		mov ecx,100
n_it:		call itime
		loop n_it
		pop ecx
		ret
;--------------------------------------