Reverse Code Engineering RCE CD +sandman 2000

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/ Reverse Code Engineering RCE CD +sandman 2000 / ReverseCodeEngineeringRceCdsandman2000.iso / RCE / Quantico / km / hprsndx.asm.txt < prev next >

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Text File | 2000-05-25 | 16.3 KB | 444 lines

.model small .stack 100h .data ;****************************************************************************** ; variables for code gen ; ;****************************************************************************** header DB ' Hypersnap-DX 3.02 license generator by +SNiKkEL',0ah,0dh,0ah,0dh,'$' info DB 0ah,0dh,' for some reason they decided to insert a ',027h,'-',027h,' into the code',0ah,0dh DB ' invalid names are:',0ah,0dh DB ' xygorf, Saltine, super user, tHATDUDE, ED!SON and hacker... sigh',0ah,0dh db 0ah,0dh,'enter any name:',0ah,0dh,' $' notright db 0ah,0dh,' your name must contain at least one letter',0ah,0dh,'$' should_be DB 'WORDXCJOSEFMENGELEJOSE',0 ;this is the regcode before 'encryption' ;WOR = world license (SIT = site license) DXC = some check ;the rest is the name; snikkel will be SNIKKELSNIKKELSN ;the alphabet will be A t/m F + L t/m o + U t/m Z (over 16 chars) ;according to this principle: divide total letters in name by 2 ;sub 2 from answer and get 4 chars from beginning of name+answer ;put those 4 after first 6 chars, then put the last 6 letters in the ;name at the end (spaces, numbers etc are ignored, all letters must be capitalized) fifthchar db 0ah,0dh,0ah,0dh,'what would you like to be the 5th letter in your code?',0ah,0dh db ' enter anything from a to z',0ah,0dh,' $' wrong db 'anything from a to z, isn',027h,'t that enuff?',0ah,0dh,' $' wagain db 'why don',027h,'t you just fuck off',0ah,0dh,'$' whatkind db 0ah,0dh,'would you like a site or a worldwide license? (s or w)',0ah,0dh,' $' personals db 0ah,0dh,0ah,0dh,' your personal unlimited site license code is:',0ah,0dh,0ah,0dh,' $' personalw db 0ah,0dh,0ah,0dh,' your personal unlimited world-wide license code is:',0ah,0dh,0ah,0dh,' $' to_enter DB 'S2345678901234-6789012345',0ah,0dh,0ah,0dh,'$' ;the code will be put here ;the S is the fifth char on which the 1st letter depends encodestr DB 'XCFNAKSHIPZUJLDORGVQTEWYBM',0 ;according to this the letters will be 'encoded' checks Dw 0 ;checksum (last char) will be put here keyb db 033h,033h,034h dup (0) ;keyboard buffer, place for input ;****************************************************************************** ; end of data, begin of code ;****************************************************************************** .code start: JMP begin ;****************************************************************************** ; calculate code proc ;****************************************************************************** calculate PROC near mov ax,@data mov ds,ax mov es,ax xor bx,bx mov cx,00001h xor dx,dx go: mov si,offset should_be add si,bx MOV al,byte ptr [si] ;put byte of name you want in al cmp al,000h jz done mov si,offset to_enter cmp cx,00010h jnz dont_use_the_2D_for_calculating inc dx ;make it skip the '-' for calculating next inc dx dont_use_the_2D_for_calculating: add si,bx add si,dx mov ah,byte ptr [si] ;put byte in ah for substracting (adding) inc al cmp bx,00000h jz fifth jmp continue fifth: mov si,offset to_enter add si,00004h ;put the 1st char in should_be MOV [si],ah ;in the right place fer output sub dx,001h continue: sub ah,041h sub al,041h add al,ah cmp al,01ah jge rotate jmp continue2 rotate: sub al,01ah continue2: mov si,offset encodestr mov ah,000h add si,ax MOV al,byte ptr [si] cmp cx,0000eh jnz dont_overwrite_the_2D_check inc cx dec dx ; make it read the char before the '-' for calculating dont_overwrite_the_2D_check: cmp cx,00005h jg fifth2 jz incdx jmp continue3 incdx: inc dx fifth2: mov si,offset to_enter add si,cx MOV byte ptr [si],al inc bx inc cx jmp go continue3: mov si,offset to_enter add si,bx MOV byte ptr [si],al inc bx inc cx jmp go done: RET ;return calculate ENDP ;****************************************************************************** ; this part asks for name ;****************************************************************************** input PROC near mov ax,@data mov ds,ax mov es,ax MOV ah,09h mov dx,offset info ;spam info int 21h mov dx,offset keyb mov ah,0ah int 21h ;and get user name MOV AH,09H MOV DX,offset fifthchar ;display fifth char message INT 21H xor cx,cx get5char: mov ax,0c07h ;clear keyb buffer & wait for input int 21h cmp al,061h ; 'a' jge letsee cmp al,041h ; 'A' jge letsee2 jmp wrongg letsee: cmp al,07bh ;'z' jge wrongg sub al,020h jmp putitin letsee2: cmp al,05bh ;'Z' jge wrongg putitin: mov si,offset to_enter MOV byte ptr [si],al MOV AH,09H MOV DX,offset whatkind ;display question INT 21H getregmode: mov ax,0c07h ;clear keyb buffer & wait for input int 21h cmp al,073h ; 's' jz sitelic cmp al,041h ; 'S' jz sitelic cmp al,077h ;'w' jz worldlic cmp al,057h ;'W' jz worldlic jmp getregmode sitelic: mov si,offset should_be MOV byte ptr [si],'S' MOV byte ptr [si+1],'I' MOV byte ptr [si+2],'T' ret worldlic: mov si,offset should_be MOV byte ptr [si],'W' MOV byte ptr [si+1],'O' MOV byte ptr [si+2],'R' ret wrongg: cmp cx,001h jz wrongagain mov ah,09h mov dx,offset wrong int 21h inc cx jmp get5char wrongagain: mov ah,09h mov dx,offset wagain int 21h jmp exit ret input endp ;****************************************************************************** ; calculate checksum ;****************************************************************************** checksum PROC near mov ax,@data mov ds,ax mov es,ax xor cx,cx mov di,offset checks go2: mov si,offset should_be xor ax,ax cmp cx,016h jz cal_char add si,cx MOV al,byte ptr [si] ;put byte of calculated in al sub al,041h push ax push cx mov ax,cx mov cx,00002h div cx pop cx pop ax test dx,dx jz nodouble add ax,ax nodouble: cmp ax,0001ah jb allrighty sub ax,00019h allrighty: add [di],ax inc cx jmp go2 cal_char: mov ax,[di] mov cx,01ah xor dx,dx div cx mov bx,dx inc bl mov si,offset to_enter+017h ;added one here, made it read the last char mov bh,byte ptr [si] sub bh,041h add bl,bh cmp bl,01ah jge rotate2 jmp go_on rotate2: sub bl,01ah go_on: mov si,offset encodestr mov bh,000h add si,bx MOV bl,byte ptr [si] mov si,offset to_enter+018h ;added one here cause of the '-' mov byte ptr [si],bl RET checksum endp ;****************************************************************************** ; check and shape up user input ;****************************************************************************** read_input proc near mov ax,@data mov ds,ax mov es,ax xor dx,dx xor ax,ax xor cx,cx mov si,offset keyb mov al,byte ptr [si+1] ;get number of chars put in by user cmp al,000h jz step_no_input ;number is zero mov bx,ax add si,2 ;move si to beginning of input loopstart: cmp bx,000h jnz notalldone jmp reformat step_no_input: jmp no_input notalldone: mov al,byte ptr [si] cmp al,061h ; 'a' checking for letters or other chars jge letsee3 cmp al,041h ; 'A' jge letsee4 jmp nolet letsee3: cmp al,07bh ;'z' jge nolet sub al,020h ;capitalize jmp putitinmem letsee4: cmp al,05bh ;'Z' jge nolet putitinmem: mov di,si sub di,dx mov byte ptr [di],al dec bx inc si jmp loopstart nolet: inc dx dec bx inc si jmp loopstart reformat: xor bx,bx mov si,offset keyb mov bl,byte ptr [si+1] ;get number of chars put in by user sub bx,dx ;substract number of not-letters cmp bl,000h jz no_input cmp bl,010h jg strip ;if name is over 16, strip 6th to ... mov si,offset keyb ;if name is =< 16 chars, repeat till full add si,002h mov di,offset should_be add di,006h mov al,010h div bl ;full times to repeat is in al, remaining is in ah ;(bl= number of valid letters in code) loopje: mov si,offset keyb ;if name is =< 16 chars, repeat till full add si,002h mov cl,bl repz movsb ;put it in once dec al ;one done cmp al,000h ;check if needs repeating jz last_time ;no, go put in remaining jmp loopje ;yes, do it again last_time: mov si,offset keyb add si,002h mov cl,ah repz movsb ;put in the remaining chars ret strip: mov si,offset keyb add si,002h mov di,offset should_be add di,006h mov cl,006h repz movsb ;put 1st 6 in place xor ax,ax mov al,bl mov cl,002h div cl mov si,offset keyb xor cx,cx mov cl,al add si,cx ;put next 4 in place mov cl,004h repz movsb sub bl,004h ;six from end, the two non chars ;from beginning 'keyb' counted mov si,offset keyb add si,bx mov cl,006h repz movsb ret no_input: mov dx,offset notright mov ah,009h int 21h jmp exit read_input endp ;****************************************************************************** ; spam the code ;****************************************************************************** spam PROC near mov ax,@data mov ds,ax mov es,ax mov di,offset should_be mov al,byte ptr[di] cmp al,'S' MOV AH,09H jnz wormessage MOV DX,offset personals ;display personal message INT 21H jmp dispcode wormessage: MOV DX,offset personalw ;display personal message INT 21H dispcode: MOV AH,09H MOV DX,offset to_enter ;display right code INT 21H RET spam endp ;****************************************************************************** ; the main program ;****************************************************************************** begin PROC near mov ax,@data mov ds,ax mov es,ax MOV AH,09H MOV DX,offset header ;display header INT 21H CALL input ;get user input call read_input CALL calculate ;calculate code from input call checksum ;calculate last char CALL spam ;spam calculated code exit: MOV AX,4C00H ;and exit INT 21H begin ENDP END START