Assembly source code Simple password input

title*** simple password input by lluct***
Datasegment, defining data segments
Input db dup (?)
Define the input string, the string must be defined in db with a length of 100 bytes
Cmpare db ' 5201314 ', ' $ '
; Define a password
MSG1 db ' PASSWORD right! ', ' $ '
To define the information that is displayed when the password is entered correctly
MSG2 db ' PASSWORD error! ', ' $ '
To define the information that is displayed when you enter a password error
Headmsg db ' ENTER YOUR PASSWORD: ', ' $ '
; Header information
Dataends End of data segment
codesegment; Define Code Snippets
Assumecs:code the content of CS
Assumeds:data the content of a DS
Start:movax,data program starting from start
Movds,ax;d S initial value, section address of data
movsi,0, variable address register set initial value 0
Call enter; Invoke show carriage return newline subroutine
Lea Dx,headmsg; offset address of the output header information string
Call Dispchs; invoke display string subroutine
repeat:movah,01h
Define the repeat label, which is used to loop through a single character. Call 1th: Enter a character from the keyboard and echo back
int21h; complete input echo
CMP AL,0DH; input character and Cr (carriage return) comparison
Jefinish, if it's equal to return, transfer to finish.
Movinput[si],al: Send Al's place to the SI address of input (like this)
Incsi si plus 1
Jmprepeat, unconditional transfer to repeat
finish:movinput[si],24h the string that completes the input with the end sign ($)
Callenter
mov si,0; Source Change address register set initial value 0
MOV di,0; purpose Change address register place initial value 0
mov cx,8; set password check digits (end sign also counted)
CHECK:CMP cx,0; The number of digits is 0.
Je Right; if the password check is complete, move to right
mov bl,input[si]; transfer data from SI address of input to BL
mov Dl,cmpare[di]; transfer data from Cmpare's di address to DL
CMP DL,BL;d L and BL comparisons
Jne error; If not equal, transfer to error
Inc SI + 1
Inc di;d I plus 1
Dec CX; CX minus 1
JMP check, unconditional transfer to check
Right:call Enter
Lea DX,MSG1
Call Dispchs
Call Enter
JMP exit
Error:call Enter
Lea DX,MSG2
Call Dispchs
mov dl,07h; output ASCII alarm (Bell) control character Bel (07h)
Call DISPCH
Call Enter
JMP exit
EXIT:MOVAH,4CH 4c Function Call: Terminates the current program and returns
int21h; return to Dos
enterprocnear; show carriage return newline subroutine
MOVDL,0DH, return controller CR (ODH) for output ASCII
Calldispch
MOVDL,0AH: LF (0ah), the newline control for the output ASCII code
Calldispch
To return to a ret;
ENTERENDP the end of a child program
Dispchprocnear display a single word subcode program
MOVAH,02H 2nd function Call: Display output characters
INT21H, complete output display
Ret
Dispchendp
Dispchsprocnear; display String subroutine
movah,09h 9th Function Call: Display string
INT21H, complete output display
Ret
Dispchsendp
codeends; end of code snippet
EndStart; closing assembly
; Copy the above code into a text program such as Notepad and save it. (e.g. Passwrod.asm)
; Compiling: MASM password.asm
; Connection: Link password.obj
; implementation: Password.exe
=================================================================
Password input with an asterisk
title*** simple Password input step by lluct***
Datasegment, defining data segments
Headmsg db ', 0dh,0ah
DB ' +----------------------------------------------+ ', 0dh,0ah
DB ' | Simple input Password system for ASM program | ', 0dh,0ah
DB ' |　　　　　　　 Have a fun. ^-^. | ', 0dh,0ah
DB ' | Poor programmer:lluct date:march,21 | ', 0dh,0ah
DB ' +----------------------------------------------+ ', 0dh,0ah
DB 0dh,0ah, ' please INPUT PASSWORD: ', ' $ '
; Define header information groups
Msg1db ' PASSWORD right! ', ' $ '
To define the information that is displayed when the password is entered correctly
Msg2db ' PASSWORD error! ', ' $ '
To define the information that is displayed when you enter a password error
Cmparedb ' 5201314 ', ' $ '
; Define a password
Inputdb100 DUP (?)
Define the input string, the string must be defined in db with a length of 100 bytes
Dataends End of data segment
codesegment; Define Code Snippets
Assumecs:code the content of CS
Assumeds:data the content of a DS
Start_program:; The program starts here.
Movax,data; Assign the data segment address to AX
Movds,ax;d S initial value, section address of data
movsi,0 the initial value of the variable address register is 0.
Callenter; Call show carriage return newline subroutine
Lea Dx,headmsg; offset address of the output header information group
Calldispchs; Call display String subroutine
Repeat_input:; Loops Enter a single character
movah,08h Call 8th function: Keyboard input character (no echo)
int21h, complete input
MOV dl,2ah; * Number of ASCII code output
Push ax; Protect the characters that were originally entered
CALLDISPCH, calling a single word echo subroutine
Pop ax to restore the characters that were originally entered
CMPAL,0DH; Enter or not
Jefinished_input is transferred to Finished_input.
Movinput[si],al; Save a single character
INCSI; access Next relative address
Jmprepeat_input, unconditional transfer to Repeat_input
Finished_input:; finish output
movinput[si],24h; Give the string you just entered the end sign ($)
Callenter
movsi,0 Si 0
movdi,0;d I 0
movcx,8 to set the length of the detection password to include the end flag
Check_password:; detection password
cmpcx,0 CX is 0
Jeright is transferred to right.
MOVBL,INPUT[SI]; transfer information from the SI address of input to BL
MOVDL,CMPARE[DI]; Transfer information from the address of Cmpare di to DL
CMPDL,BL check whether DL and BL are the same
Jneerror, not just transferred to the error
Incsi si plus 1
INCDI;d I plus 1
DECCX CX minus 1
Jmpcheck_password
Right
Call Enter
Leadx,msg1
Calldispchs
Callenter
Jmpexit
Error
Callenter
Leadx,msg2
Calldispchs
movdl,07h output ASCII alarm (Bell) control character Bel (07h)
Call DISPCH
Callenter
Jmpexit
Exit:mov ah,4ch 4c Function Call: Terminates the current program and returns
int21h; return to Dos
enterprocnear; show carriage return newline subroutine
MOVDL,0DH, return controller CR for output ASCII
Calldispch
Movdl,0ah the newline control character of the output ASCII LF
Calldispch
To return to a ret;
Enterendp
Dispchprocnear display a single word subcode program
MOV ah,02h 2nd number function call: Display output characters
INT21H, complete output display
Ret
Dispchendp
Dispchsprocnear; display String subroutine
movah,09h 9th Function Call: Display string
int21h
Ret
Dispchsendp
codeends; end of code snippet
End Start_program Assembly
; Copy the above code into a text program such as Notepad and save it. (e.g. Passwd2.asm)
; Compiling: MASM passwd2.asm
; Connection: Link passwd2.obj
; implementation: Passwd2.exe