好久没有作品可以放上来与大家分享了,今特奉上一款本人独立创作完成的完全用汇编语言编写而成的小工具"rsa计算器"。输入输出全部都用十六进制格式,可对数据进行运算,而不是对文本。点击下载:附件!
n能到1024位。也有疑问,位数再高不知为何不行。(改变DD_NUM等值的数即可改变位数)
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.386
.model flat, stdcall
option casemap :none
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include windows.inc
include user32.inc
includelib user32.lib
include kernel32.inc
includelib kernel32.lib
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ICO_MAIN equ 1000 ;图标
DLG_MAIN equ 100
DD_NUM EQU 32 ;位数除以32,即DWORD数
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
.data?
hInstance dd ?
actural_b dd DD_NUM * 2 dup (0)
actural_n dd DD_NUM * 2 dup (0)
actural_m dd DD_NUM * 2 dup (0)
result dd DD_NUM * 2 dup (0)
presult dd ?
.data
rsa_a dd DD_NUM dup (0)
rsa_b dd DD_NUM dup (0)
rsa_c dd DD_NUM dup (0)
rsa_n dd DD_NUM dup (0)
rsa_p dd DD_NUM dup (0)
rsa_m dd DD_NUM dup (0)
.const
default_b db "10001",0 ;设置默认的私钥
default_n db "C7B71C573A60F571",0 ;设置默认的模
default_m db "BCF0DB712E6595F1",0 ;设置默认的数据
num_error db "有非法字符!",0
blank_error db "输入所有数据!",0
format db "%X",0
format8 db "%8X",0
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.code
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rsa proc
push ebp
mov ebp,esp
;------------------------------; 置初值
mov rsa_c,1
;-------------------------------循环计算
rsa0: mov eax,rsa_b ;bl;
and eax,1 ;b&1
.if eax == 0 ;b偶数?
;------------------------------b = b >> 1 ;b是偶数时
rcl eax,1
mov esi,DD_NUM ;2
.repeat
rcr eax,1
rcr [rsa_b-4+esi*4],1
rcl eax,1
dec esi
.until esi == 0
;------------------------------a = (a * a) mod n
lea eax,rsa_a ;c--[EBP-08h][EBP-04h]
call mulanddiv ;<--调用两数相乘再除以n的子程序,
.else
sub rsa_b,1 ;b = b - 1 只需将b的最低位置0即可
;------------------------------c = (c * a) mod n
lea eax,rsa_c ;a
call mulanddiv ;<--调用两数相乘再除以n的子程序 .endif
;------------------------------判断b是否0 while(b)
mov esi,DD_NUM ;2
.repeat
cmp [rsa_b-4+esi*4],0 ;判断b是否0
ja rsa0
dec esi
.until esi == 0
;------------------------------计算结束
pop ebp
retn
rsa endp
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
;-----------------------------两数相乘再和另一个数相除的子程序段
mulanddiv proc
mov ebx,eax
lea ecx,rsa_a
xor eax,eax
xor esi,esi
.repeat
mov [rsa_p+esi*4],eax ;乘积置初值0
inc esi
.until esi == DD_NUM + DD_NUM ;4
push ebp
xor edi,edi
.repeat
lea ecx,[ecx+edi*4] ;ecx=ecx+edi*4
xor esi,esi ;esi=0
lea ebp,[rsa_p+edi*4]
.repeat
mov eax,[ebx+esi*4]
mul DWORD ptr [ecx]
lea ebp,[ebp+esi*4]
add DWORD ptr [ebp],eax
adc DWORD ptr [ebp+4],edx
adc DWORD ptr [ebp+8],0
inc esi
.until esi == DD_NUM ;2
inc edi
.until edi == DD_NUM ;2
pop ebp
;--------------------------------两个数相除 取余数
mov ecx,DD_NUM * 20H ;40H ;<--设循环次数为64次
bigdiv: xor esi,esi
inc esi
push ecx
mov ecx,DD_NUM + DD_NUM - 1
shl DWORD ptr [rsa_p],1;被除数左移1位
SHIFTP: rcl DWORD ptr [rsa_p+esi*4],1
inc esi
loop SHIFTP
pop ecx
mov esi,DD_NUM;2 ;比较
.repeat
mov eax,[rsa_n-4+esi*4]
cmp [rsa_m-4+esi*4],eax
jc loop0
ja asubb
dec esi
.until esi == 0
asubb: xor esi,esi ;相减
clc
push ecx
mov ecx,DD_NUM
msubn: mov eax,[rsa_n+esi*4]
sbb [rsa_m+esi*4],eax
inc esi
loop msubn
pop ecx
loop0: loop bigdiv
xor esi,esi
.repeat
mov eax,[rsa_m+esi*4] ;保存余数
mov [ebx+esi*4],eax
inc esi
.until esi == DD_NUM ;2
retn
mulanddiv endp
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
scan_data proc hWnd
;检查输入数据的长度
mov edi,eax
invoke lstrlen,eax
.if eax ==0
jmp nonum
.endif
;检查输入数据中是否有非法字符
scan_b:
mov al,BYTE ptr [edi]
.if al == 0
xor eax,eax
inc eax
jmp scan_end
.elseif al >= '0' && al <= '9' || al >= 'A' && al <= 'F' || al >= 'a' && al <= 'f'
inc edi
jmp scan_b
.else
jmp notnum
.endif
notnum:
invoke SetDlgItemText,hWnd,104,addr num_error
xor eax,eax
jmp scan_end
nonum:
invoke SetDlgItemText,hWnd,104,addr blank_error
xor eax,eax
scan_end:
pop ebp
retn 4
scan_data endp
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stringtoint proc
mov esi,eax
mov edi,edx
invoke lstrlen,eax
xchg eax,esi
mov edx,edi
xor ebx,ebx
conv: mov cl,BYTE ptr [eax+esi-1]
.if cl >= 'A' && cl <= 'F'
sub cl,'A'-0ah
.elseif cl >= 'a' && cl <= 'f'
sub cl,'a'-0ah
.else
sub cl,'0'
.endif
mov bl,cl
dec esi
jz oddbit
mov cl,BYTE ptr [eax+esi-1]
.if cl >= 'A' && cl <= 'F'
sub cl,'A'-0ah
.elseif cl >= 'a' && cl <= 'f'
sub cl,'a'-0ah
.else
sub cl,'0'
.endif
shl cl,4
add bl,cl
mov BYTE ptr [edx],bl
inc edx
dec esi
jnz conv
jmp convert_end
oddbit: mov BYTE ptr [edx],bl
convert_end:
retn
stringtoint endp
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
inttostring proc
mov esi,eax
mov edi,edx
invoke lstrlen,eax
cdq
mov ecx,4
div ecx
mov ebx,eax
xor eax,eax
lea eax,result
mov presult,eax
.if edx != 0
mov eax,DWORD ptr [esi+ebx*4]
invoke wsprintf,presult,addr format,eax
add presult,eax
.endif
.while ebx > 0
mov eax,DWORD ptr [esi+ebx*4-4]
invoke wsprintf,presult,addr format,eax
add presult,eax
dec ebx
.endw
retn
inttostring endp
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_ProcDlgMain proc uses ebx edi esi hWnd,wMsg,wParam,lParam
mov eax,wMsg
.if eax == WM_CLOSE
invoke EndDialog,hWnd,NULL
.elseif eax == WM_INITDIALOG
invoke LoadIcon,hInstance,ICO_MAIN
invoke SendMessage,hWnd,WM_SETICON,ICON_BIG,eax
invoke SetDlgItemText,hWnd,101,addr default_b
invoke SetDlgItemText,hWnd,102,addr default_n
invoke SetDlgItemText,hWnd,103,addr default_m
.elseif eax == WM_COMMAND
mov eax,wParam
.if ax == IDCANCEL
invoke EndDialog,hWnd,NULL
.elseif ax == IDOK
invoke SetDlgItemText,hWnd,104,NULL
lea eax,actural_b
xor edx,edx
mov ecx,DD_NUM * 8 + 1
clrmem: mov [eax + ecx * 4 - 4],edx
loop clrmem
lea eax,rsa_a
mov ecx,DD_NUM * 6 + 1
clrmem1: mov [eax + ecx * 4 - 4],edx
loop clrmem1
invoke GetDlgItemText,hWnd,101,addr actural_b,sizeof actural_b
invoke GetDlgItemText,hWnd,102,addr actural_n,sizeof actural_n
invoke GetDlgItemText,hWnd,103,addr actural_m,sizeof actural_m
lea eax,actural_b
invoke scan_data,hWnd
.if eax
lea eax,actural_n
invoke scan_data,hWnd
.if eax
lea eax,actural_m
invoke scan_data,hWnd
.if eax
lea eax,actural_b
lea edx,rsa_b
call stringtoint
lea eax,actural_n
lea edx,rsa_n
call stringtoint
lea eax,actural_m
lea edx,rsa_a
call stringtoint
call rsa
lea eax,rsa_c
lea edx,result
call inttostring
invoke SetDlgItemText,hWnd,104,addr result
.endif
.endif
.endif
.endif
.else
mov eax,FALSE
ret
.endif
mov eax,TRUE
ret
_ProcDlgMain endp
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
start:
invoke GetModuleHandle,NULL
mov hInstance,eax
invoke DialogBoxParam,hInstance,DLG_MAIN,NULL,offset _ProcDlgMain,NULL
invoke ExitProcess,NULL
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end start
:)
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