硬盘逻辑锁

原帖：
硬盘逻辑锁 - 只有输入密码硬盘才会被解锁
http://bbs.fishc.com/thread-43343-1-1.html




org 0x7c00  ;原MBR内容位于 逻辑3扇区  密码4扇区
                        ;密码加密方式   所有字符ASCLL相加
start:
mov ax,cs
mov ds,ax
mov ss,ax
mov es,ax
mov sp,0x100
mov bx,0
main:
;读取原内容
mov ax,0x7e00
mov ds,ax
mov bx,0
mov dx,0x1f2
mov al,0x01
out dx,al
mov dx,0x1f3
mov al,0x3  ;3扇区
out dx,al
inc dx  ;8-15
mov al,0
out dx,al
inc dx ;16-23
out dx,al
inc dx ;24-27
mov al,0xe0
out dx,al
mov dx,0x1f7 ;读命令
mov al,0x20
out dx,al
mov dx,0x1f7
.waits:
        in al,dx
        and al,0x88
        cmp al,0x08
        jnz .waits
        mov cx,256
        mov dx,0x1f0
        .read:
        in ax,dx
        mov [bx],ax
        add bx,2
        loop .read       
        ;显示字符串
mov bp,msg1
mov cx,msg2-msg1
mov ax,0x1301
mov bx,0x0c
mov dl,0
int 0x10
;检测按键
GetKey:
mov bx,0
mov si,0
GetKey_:
mov ax,0xb800
mov ds,ax
mov ax,0
int 0x16
cmp al,0x1b ;Esc键
je Esc_
cmp al,0x8  ;退格键
je BackSpace
cmp al,0x0d ;回车键
jne GetKey_q
        next:
        ;判断密码
        mov cx,si
        mov bx,0
        mov dx,0
        mov si,0
        key_js:
        mov al,[ds:si]
        mov ah,0
        add dx,ax
        add si,2
        loop key_js
        mov ax,[cs:y_key]
        cmp ax,dx
        je Ks
        jne Esc_
       
        Esc_:
        mov ch,0
        mov  cl,0x4e
        mov  al,0x00
        mov ah,0x07
        mov bx,0
         _esc:
         mov [bx],ax
         add bx,2
        loop _esc
        mov bx,0
        mov si,0
        mov [bx],al
        mov [bx+1],ah
        jmp GetKey
       
;解除硬盘逻辑锁       
Ks:
mov ax,0x7e00
mov ds,ax
mov bx,0

mov dx,0x1f2
mov al,0x01
out dx,al

mov dx,0x1f3
mov al,0x0  ;0扇区
out dx,al

inc dx  ;8-15
mov al,0
out dx,al

inc dx ;16-23
out dx,al

inc dx ;24-27
mov al,0xe0
out dx,al

mov dx,0x1f7 ;写命令
mov al,0x30
out dx,al

mov dx,0x1f7
.waits_wr:
        in al,dx
        and al,0x88
        cmp al,0x08
        jnz .waits_wr
        mov cx,256
        mov dx,0x1f0
        .write:
        mov ax,[bx]
        out dx,ax
        add bx,2
        loop .write       
       
;重启计算机
.REST:
mov ax,0xb800
mov ds,ax
mov bx,0
mov byte [bx],‘a‘


mov ax,0xffff
push ax
mov ax,0
push ax
retf

GetKey_q:
mov byte [bx],al
add bx,2
inc si
jmp GetKey_
BackSpace:
mov byte [bx],0
sub si,1
sub bx,2
jmp GetKey_

msg1 db ‘Please Input Password‘
msg2 db ‘.‘
msg3 db ‘*‘
msg4 db ‘KeyTag‘
y_key dw 0x019E       ；密码的ASCLL和 需要替换。
times 510-($-$$)  db 0
dw 0xAA55

硬盘逻辑锁

原文：https://www.cnblogs.com/uncle-hippo/p/14864353.html