fsc.asm

汇编数据加密

title ***简单密码输入进阶 by lluct*** 


data segment ;定义数据段 
headmsg db ' ',0dh,0ah 
db '+-----------------------------------------------------+',0dh,0ah 
db '| .^-^. workgroup:fanshichao zhaifang lizhenchao .^-^.|',0dh,0ah 
db '+-----------------------------------------------------+',0dh,0ah 
db 0dh,0ah,' OUTPUT :','$' 
input db 100 dup (?) 
data ends 

code segment 
assume cs:code 
assume ds:data

start_program: 
mov ax,data 
mov ds,ax 
mov si,0 


lea dx,headmsg ;输出头信息组
call dispchs ;调用显示字符串子程序 

repeat_input: ;输入字符 
mov ah,08h
int 21h 
mov dl,2ah ;输出ascii码的*号 
push ax 
call dispch 
pop ax 
cmp al,0dh ;是否回车 
je finished_input ;是就转移到finished_input 
mov input[si],al 
mov cl,4;加密，循环左移4位
rol input[si],cl
inc si 
jmp repeat_input 

finished_input: ;完成输出 
      mov input[si],24h ;给刚才输入的字符串加结束标志($) 
      call enter 
      lea dx,input ;输出
      call dispchs 
      call enter 
      jmp exit 

exit: mov ah,4ch ;终止当前程序并返回 
      int 21h 

enter proc near ;显示回车换行子程序 
      mov dl,0dh  
      call dispch 
      mov dl,0ah  
      call dispch 
      ret  
enter endp 

dispch proc near ;显示单个字符子程序 
      mov ah,02h  
      int 21h  
      ret 
dispch endp 

dispchs proc near ;显示字符串子程序 
      mov ah,09h  
      int 21h 
      ret 
dispchs endp 

code ends ;代码段结尾 
end start_program ;结束汇编