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402 lines
13 KiB
NASM
402 lines
13 KiB
NASM
;ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
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; Black Wolf's File Protection Utilities 2.1s
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;
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;PassCOM - This program password protects the specified file by attaching
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; code from PW_COM onto the file so that it will check for passwords
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; each execution. It utilizes ULTIMUTE .93á to protect then PW_COM
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; code from easy manipulation.
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;
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;LISCENSE:
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; Released As Freeware - These files may be distributed freely.
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;
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;Any modifications made to this program should be listed below the solid line,
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;along with the name of the programmer and the date the file was changed.
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;Also - they should be commented where changed.
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;
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;NOTE THAT MODIFICATION PRIVILEDGES APPLY ONLY TO THIS VERSION (2.1s)!
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;I'd appreciate notification of any modifications if at all possible,
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;reach me through the address listed in the documentation file (bwfpu21s.doc).
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;
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;DISCLAIMER: The author takes ABSOLUTELY NO RESPONSIBILITY for any damages
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;resulting from the use/misuse of this program/file. The user agrees to hold
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;the author harmless for any consequences that may occur directly or
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;indirectly from the use of this program by utilizing this program/file
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;in any manner.
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;ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
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;Modifications:
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; None as of 08/05/93 - Initial Release.
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.model tiny
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.radix 16
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.code
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org 100
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extrn _ULTMUTE:near, _END_ULTMUTE:byte
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start:
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call GetFilename
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call Get_Passes
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call EncryptGP
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call Do_File
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mov ax,4c00
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int 21
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;---------------------------------------------------------------------------
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GetFilename:
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mov ah,09
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mov dx,offset Message
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int 21
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mov dx,offset Filename_Data
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mov al,60
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call gets
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ret
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;---------------------------------------------------------------------------
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Get_Passes:
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Clear_Out_Passes:
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mov di,offset Entered_Pass
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mov cx,0ch ;Clear out entered pass.
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xor ax,ax
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repnz stosb
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mov di,offset Password
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mov cx,0ch ;Clear out entered pass.
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xor ax,ax
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repnz stosb
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mov ah,09
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mov dx,offset Req_Pass
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int 21
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mov di,offset Entered_Pass
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mov cx,0ch
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call GetPass
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mov ah,09
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mov dx, offset Dup_Pass
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int 21
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mov di,offset Password
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mov cx,0ch
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call GetPass
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call Check_Passwords
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jc Get_Passes
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mov di,offset Entered_Pass
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mov cx,0dh ;Clear out entered pass.
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xor ax,ax
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repnz stosb
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Randomize_Keys:
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push ds
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xor ax,ax
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mov ds,ax
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mov ax,word ptr ds:[46c] ;Randomizes encryption
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pop ds
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mov word ptr [Key1],ax
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xor ax,1f3eh
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ror ax,1
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mov word ptr [Key2],ax
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Encrypt_Password: ;This algorithm needs extra work...
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mov bx,word ptr [Key1]
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mov dx,word ptr [Key2] ;Encrypt the password
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mov si,offset Password
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mov di,si
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mov cx,6
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EncryptIt:
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lodsw
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xor ax,bx
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add bx,dx
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stosw
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loop EncryptIt
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ret
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;---------------------------------------------------------------------------
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Message:
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db 'PassCOM 2.0 (c) 1993 Black Wolf Enterprises.',0a,0dh
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db 'Enter Filename To Protect -> $'
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;---------------------------------------------------------------------------
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Req_Pass db 0a,0dh,'Now Enter Password (up to 12 chars): $'
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Dup_Pass db 0a,0dh,'Re-Enter Password: $'
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Passes_Not db 0a,0dh,'Passwords do not match. Try again.',0a,0dh,24
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;---------------------------------------------------------------------------
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Check_Passwords:
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mov si,offset Entered_Pass
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mov di,offset Password
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mov cx,0c
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repz cmpsb
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jcxz Password_Good
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stc
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ret
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Password_Good:
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clc
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ret
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;---------------------------------------------------------------------------
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gets: ;get string
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mov ah,0a
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push bx
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mov bx,dx
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mov byte ptr ds:[bx],al
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mov byte ptr ds:[bx+1],0
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pop bx
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int 21
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push bx
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mov bx,dx
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mov al,byte ptr ds:[bx+1]
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xor ah,ah
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add bx,ax
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mov byte ptr ds:[bx+2],0
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pop bx
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ret
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;---------------------------------------------------------------------------
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GetPass:
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KeyHit_Loop: ;Load in password
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push cx
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sub ax,ax
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int 16
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cmp al,0dh
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je HitReturn
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stosb
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pop cx
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loop KeyHit_Loop
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ret
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HitReturn:
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pop cx
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xor al,al
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repnz stosb
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ret
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;---------------------------------------------------------------------------
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Time dw 0
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Date dw 0
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GetTime:
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mov ax,5700 ;Get file date/time from handle BX
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int 21
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mov word ptr cs:[Time],cx
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mov word ptr cs:[Date],dx
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ret
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SetTime: ;Set file date/time for handle BX
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mov ax,5701
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mov cx,word ptr cs:[Time]
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mov dx,word ptr cs:[Date]
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int 21
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ret
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Do_File:
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mov ax,3d02
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mov dx,offset Filename
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int 21 ;Open file read/write
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jc Terminate
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xchg bx,ax
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call GetTime ;Get file date/time
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call BackupFile ;make a copy....
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mov ah,3f
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mov cx,4
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mov dx,offset Storage_Bytes ;Read in first four bytes for jump
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int 21
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mov ax,4202
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xor cx,cx
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xor dx,dx ;go to the end of the file
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int 21
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sub ax,3
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mov word ptr [JumpBytes+1],ax ;Save Jump size
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push bx
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mov si,offset begin_password ;On Entry -> CS=DS=ES
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mov di,offset _END_ULTMUTE ;SI=Source, DI=Destination
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mov bx,ax ;BX=Next Entry Point
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add bx,103
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mov cx,end_password-begin_password+1 ;CX=Size to Encrypt
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mov ax,1 ;AX=Calling Style
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call _ULTMUTE ;Encrypt Code
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;On Return -> CX=New Size
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pop bx
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mov dx,offset _END_ULTMUTE
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mov ah,40 ;Write encrypted code and
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int 21 ;decryptor to end of file
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mov ax,4200
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xor dx,dx ;Go back to beginning of file
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xor cx,cx
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int 21
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mov ah,40
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mov cx,4
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mov dx,offset JumpBytes ;Write in jump to decryptor
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int 21
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call SetTime ;Restore file date/time
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mov ah,3e
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int 21 ;close file
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ret
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Terminate:
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mov ah,09
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mov dx,offset BadFile
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int 21
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ret
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BadFile db 'Error Opening File.',07,0dh,0a,24
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JumpBytes db 0e9,0,0,'á'
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EncryptGP: ;Encrypt GoodPass routine in pw_com
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xor ax,ax ;with value from password itself...
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mov cx,0c
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mov si,offset Password
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GetValue:
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lodsb
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add ah,al
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ror ah,1 ;Get value to use for encrypt...
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loop GetValue
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mov si,offset Goodpass
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mov cx,EndGoodPass-GoodPass
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Decrypt_Restore: ;This needs improvement....
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mov al,[si]
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xor al,ah
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mov [si],al
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inc si
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loop Decrypt_Restore
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ret
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BackupFile: ;Create copy of file...
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mov si,offset Filename
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mov cx,80
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Find_Eofn:
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lodsb
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cmp al,'.' ;Find file extension
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je FoundDot
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or al,al
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jz FoundZero
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loop Find_Eofn
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jmp Terminate
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FoundZero:
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mov byte ptr [si-1],'.'
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inc si
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FoundDot:
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mov word ptr [si],'LO'
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mov byte ptr [si+2],'D' ;Change extension to 'OLD'
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mov byte ptr [si+3],0
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mov dx,offset Filename
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mov word ptr [SourceF],bx
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mov ah,3c
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xor cx,cx
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int 21
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jnc GCreate
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jmp Terminate
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GCreate:
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mov word ptr cs:[Destf],ax
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BackLoop:
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mov ah,3f
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mov bx,word ptr cs:[Sourcef]
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mov cx,400
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mov dx,offset FileBuffer ;Copy file to backup
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int 21
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mov cx,ax
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mov ah,40
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mov bx,word ptr cs:[Destf]
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mov dx,offset Filebuffer
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int 21
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cmp ax,400
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je BackLoop
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DoneBack:
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mov bx,word ptr cs:[Destf]
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call SetTime ;Save original date/time stamp in
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;backup
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mov ah,3e
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mov bx,word ptr cs:[Destf]
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int 21 ;Close file
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mov ax,4200
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xor cx,cx
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xor dx,dx
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mov bx,word ptr cs:[Sourcef] ;Go back to the beginning of the
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int 21 ;source file
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ret
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SourceF dw 0
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DestF dw 0
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;This is code from PW_COM compiled converted to data bytes..
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;If you modify PW_COM, you must compile it and convert it, then
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;place it here. Note that the byte 0ffh marks the beginning and
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;end of Goodpass for simplicity....
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begin_password:
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db 0e8h, 02dh, 01h, 02eh, 0c6h, 086h, 09h, 01h, 0eah, 0ebh
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db 06h, 00h, 0ebh, 011h, 090h, 0adh, 0deh, 0bbh, 021h, 01h
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db 03h, 0ddh, 053h, 02eh, 0c6h, 086h, 011h, 01h, 0c3h, 0ebh
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db 0edh, 0ebh, 0f0h, 0fah, 050h, 01eh, 033h, 0c0h, 08eh, 0d8h
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db 08dh, 086h, 01ch, 02h, 087h, 06h, 00h, 00h, 050h, 08ch
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db 0c8h, 087h, 06h, 02h, 00h, 050h, 01eh, 0eh, 01fh, 02eh
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db 0c7h, 086h, 044h, 01h, 090h, 090h, 033h, 0c9h, 0f7h, 0f1h
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db 01fh, 058h, 087h, 06h, 02h, 00h, 058h, 087h, 06h, 00h
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db 00h, 01fh, 058h, 0fbh, 0e8h, 0aah, 00h, 02eh, 080h, 086h
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db 05eh, 01h, 010h, 0ebh, 03h, 090h, 0eah, 09ah, 0e8h, 081h
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db 00h, 0e8h, 069h, 00h, 072h, 038h, 033h, 0c0h, 0b9h, 0ch
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db 00h, 08dh, 0b6h, 04eh, 02h, 0ach, 02h, 0e0h, 0d0h, 0cch
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db 0e2h, 0f9h, 08dh, 0b6h, 090h, 01h, 0b9h, 011h, 00h, 08ah
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db 04h, 032h, 0c4h, 088h, 04h, 046h, 0e2h, 0f7h, 0e8h, 039h
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db 00h, 0ebh, 01h, 0ffh
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GoodPass:
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db 0bfh, 00h, 01h, 057h, 08dh, 0b6h
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db 03eh, 02h, 0a5h, 0a5h, 033h, 0c0h, 08bh, 0f0h, 08bh, 0f8h
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db 0c3h
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EndGoodPass:
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db 0ffh, 0b4h, 09h, 08dh, 096h, 0afh, 01h, 0cdh, 021h
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db 0b8h, 01h, 04ch, 0cdh, 021h, 0ah, 0dh, 050h, 061h, 073h
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db 073h, 077h, 06fh, 072h, 064h, 020h, 049h, 06eh, 063h, 06fh
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db 072h, 072h, 065h, 063h, 074h, 02eh, 07h, 024h, 090h, 0ebh
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db 05h, 090h, 0eah, 0f8h, 0c3h, 09ah, 0fch, 0ebh, 0fah, 08dh
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db 0b6h, 04eh, 02h, 08dh, 0beh, 042h, 02h, 0b9h, 0ch, 00h
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db 0f3h, 0a6h, 0e3h, 03h, 0f9h, 0c3h, 0e9h, 0f8h, 0c3h, 00h
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db 08bh, 09eh, 03ah, 02h, 08bh, 096h, 03ch, 02h, 08dh, 0b6h
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db 04eh, 02h, 08bh, 0feh, 0b9h, 06h, 00h, 0adh, 033h, 0c3h
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db 03h, 0dah, 0abh, 0e2h, 0f8h, 0c3h, 0eah, 0b9h, 0ch, 00h
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db 08dh, 0beh, 04eh, 02h, 051h, 02bh, 0c0h, 0cdh, 016h, 03ch
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db 0dh, 074h, 05h, 0aah, 059h, 0e2h, 0f3h, 0c3h, 059h, 032h
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db 0c0h, 0f2h, 0aah, 0c3h, 0b4h, 09h, 08dh, 096h, 025h, 02h
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db 0cdh, 021h, 0cfh, 050h, 061h, 073h, 073h, 077h, 06fh, 072h
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db 064h, 02dh, 03eh, 024h, 05dh, 0ebh, 01h, 0eah, 055h, 081h
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db 0edh, 03h, 01h, 0c3h
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;------------------------------------------------------------------------
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Key1 dw 0
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Key2 dw 0
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;------------------------------------------------------------------------
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Storage_Bytes db 90,90,0cdh,20
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;------------------------------------------------------------------------
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Password db 'Greetings to'
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Entered_Pass db 'everyone! '
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db 0,0,0,0,0,0,0
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end_password:
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dw 0
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dw 0
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Filename_data dw 0
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Filename db 80 dup(0) ;These are stored as zeros to
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FileBuffer db 400 dup(0) ;keep from overwriting ultimute...
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end start
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