心理测试小精灵4.0版算法分析
1.fi2.5查无壳，delphi编写。上flyODBG V1.10正式汉化修改版伺候
2.概要分析：
004FAB17 mov eax,dword ptr ds:[ebx+2F0]
004FAB1D call XLCS.00446A80
004FAB22 mov edx,dword ptr ss:[ebp-8] ;注册名"sky"
004FAB25 lea ecx,dword ptr ss:[ebp-4]
004FAB28 mov eax,ebx
004FAB2A call XLCS.004FAD64 ;*注册程序,将注册名转为注册码
004FAB2F lea edx,dword ptr ss:[ebp-C]
004FAB32 mov eax,dword ptr ds:[ebx+2F4]
004FAB38 call XLCS.00446A80
004FAB3D mov eax,dword ptr ss:[ebp-C] ; 假码"1234"
004FAB40 mov edx,dword ptr ss:[ebp-4] ；真码"32565449433"
004FAB43 call XLCS.00404BDC ；比较
004FAB48 jnz XLCS.004FABFC ；不为零就die
进入004FAB2A call XLCS.004FAD64
....
004FADB2 call XLCS.00404A98
004FADB7 mov edi,eax
004FADB9 mov esi,1E8DEE ;esi=2002414 初使值。
004FADBE test edi,edi
004FADC0 jnz short XLCS.004FADD7
004FADC2 mov eax,dword ptr ds:[ebx+2F0]
004FADC8 mov edx,XLCS.004FB04C
004FADCD call XLCS.00446AB0
......
004FAE17 lea edx,dword ptr ss:[ebp-10]
004FAE1A xor eax,eax
004FAE1C mov al,bl
004FAE1E call XLCS.00409300
004FAE23 lea edx,dword ptr ss:[ebp-14]
004FAE26 xor eax,eax
004FAE28 mov al,byte ptr ss:[ebp-9]
004FAE2B call XLCS.00409300
004FAE30 lea eax,dword ptr ss:[ebp-2C]
004FAE33 push eax
004FAE34 mov eax,dword ptr ss:[ebp-10]将注册名的16进制ASCII码转为10进制
004FAE37 call XLCS.00404A98 取第一个注册名ASCII码的10进制个位
004FAE3C mov edx,eax ‘s'ASCII码为115,所以A=5
004FAE3E mov ecx,1
004FAE43 mov eax,dword ptr ss:[ebp-10]
004FAE46 call XLCS.00404CF0
004FAE4B mov eax,dword ptr ss:[ebp-2C]
004FAE4E call XLCS.00409364
004FAE53 mov ebx,eax
004FAE55 lea eax,dword ptr ss:[ebp-30]
004FAE58 push eax
004FAE59 mov eax,dword ptr ss:[ebp-14] 取最后个注册名的ASCII码10进制个位
004FAE5C call XLCS.00404A98 'y'ASCII码为121，所以B=1
004FAE61 mov edx,eax
004FAE63 mov ecx,1
004FAE68 mov eax,dword ptr ss:[ebp-14]
004FAE6B call XLCS.00404CF0
004FAE70 mov eax,dword ptr ss:[ebp-30]
004FAE73 call XLCS.00409364
004FAE78 xor edx,edx
004FAE7A mov dl,bl
004FAE7C imul edx,edx,7BD ;A=5*7BD=26B1,取4位
004FAE82 and eax,0FF
004FAE87 imul edx,eax A=A*B=26B1*1=26B1 (10进制为9905)
004FAE8A mov dword ptr ss:[ebp-20],edx
004FAE8D mov eax,edi
004FAE8F test al,al
004FAE91 jbe short XLCS.004FAECF
004FAE93 mov byte ptr ss:[ebp-21],al 注册名ASCII码取10进制数
004FAE96 mov bl,1 C=1E8DEE+'s'*1+'k'*2+'y'*3.....
004FAE98 /mov eax,ebx ;1E8DEE加第一个注册名乘1加第二个*2加...
004FAE9A |dec eax
004FAE9B |sub al,5 ; Switch (cases 0..31)
004FAE9D |jb short XLCS.004FAEA5
004FAE9F |sub al,2D
004FAEA1 |jb short XLCS.004FAEBB
004FAEA3 |jmp short XLCS.004FAEC9
004FAEA5 |xor eax,eax ; Cases 0,1,2,3,4 of switch 004FAE9B
004FAEA7 |mov al,bl
004FAEA9 |mov edx,dword ptr ss:[ebp-4]
004FAEAC |movzx eax,byte ptr ds:[edx+eax-1]
004FAEB1 |xor edx,edx
004FAEB3 |mov dl,bl
004FAEB5 |imul edx
004FAEB7 |add esi,eax
004FAEB9 |jmp short XLCS.004FAEC9
004FAEBB |xor eax,eax ; Cases 5,6,7,8,9,A,B,C,D,E,F,10,11,12,13,14,15,16,17,18,19,1A,1B,1C,1D,1E,1F,20,21,22,23,24,25,26,27,28,29,2A,2B,2C,2D,2E,2F,30,31 of switch 004FAE9B
004FAEBD |mov al,bl
004FAEBF |mov edx,dword ptr ss:[ebp-4]
004FAEC2 |movzx eax,byte ptr ds:[edx+eax-1]
004FAEC7 |add esi,eax
004FAEC9 |inc ebx ; Default case of switch 004FAE9B
004FAECA |dec byte ptr ss:[ebp-21]
004FAECD \jnz short XLCS.004FAE98
004FAECF mov eax,esi
004FAED1 xor edx,edx ;转10进制
004FAED3 push edx ; /Arg2 => 00000000
004FAED4 push eax ; |Arg1
004FAED5 lea eax,dword ptr ss:[ebp-34] ; |
004FAED8 call XLCS.00409330 ; \XLCS.00409330
004FAEDD mov eax,dword ptr ss:[ebp-34]
004FAEE0 push eax
004FAEE1 mov eax,dword ptr ss:[ebp-20]
004FAEE4 xor edx,edx ;转10进制
004FAEE6 push edx ; /Arg2 => 00000000
004FAEE7 push eax ; |Arg1
004FAEE8 lea eax,dword ptr ss:[ebp-38] ; |
004FAEEB call XLCS.00409330 ; \XLCS.00409330
004FAEF0 mov edx,dword ptr ss:[ebp-38]
004FAEF3 lea eax,dword ptr ss:[ebp-18]
004FAEF6 pop ecx
004FAEF7 call XLCS.00404AE4
004FAEFC mov eax,dword ptr ss:[ebp-18] '9905'+'2003106'
004FAEFF call XLCS.00404A98 ;合并两组数A=99052003106
004FAF04 test al,al
004FAF06 jbe XLCS.004FAFF9
004FAF0C mov byte ptr ss:[ebp-21],al 0123456789
004FAF0F mov bl,1 用A来查表："4059617382"
004FAF11 /xor eax,eax 即得注册码：
004FAF13 |mov al,bl 22415449047
004FAF15 |mov edx,dword ptr ss:[ebp-18]
004FAF18 |movzx eax,byte ptr ds:[edx+eax-1]
004FAF1D |add eax,-30 ; Switch (cases 30..39)
004FAF20 |cmp eax,9
004FAF23 |ja XLCS.004FAFEF
004FAF29 |jmp dword ptr ds:[eax*4+4FAF30]
004FAF30 |dd XLCS.004FAF58 ; Switch table used at 004FAF29
004FAF34 |dd XLCS.004FAF6A
004FAF38 |dd XLCS.004FAF79
004FAF3C |dd XLCS.004FAF88
004FAF40 |dd XLCS.004FAF97
004FAF44 |dd XLCS.004FAFA6
004FAF48 |dd XLCS.004FAFB5
004FAF4C |dd XLCS.004FAFC4
004FAF50 |dd XLCS.004FAFD3
004FAF54 |dd XLCS.004FAFE2
004FAF58 |lea eax,dword ptr ss:[ebp-1C] ; Case 30 ('0') of switch 004FAF1D
004FAF5B |mov edx,XLCS.004FB070
004FAF60 |call XLCS.00404AA0
004FAF65 |jmp XLCS.004FAFEF
004FAF6A |lea eax,dword ptr ss:[ebp-1C] ; Case 31 ('1') of switch 004FAF1D
004FAF6D |mov edx,XLCS.004FB07C
004FAF72 |call XLCS.00404AA0
004FAF77 |jmp short XLCS.004FAFEF
004FAF79 |lea eax,dword ptr ss:[ebp-1C] ; Case 32 ('2') of switch 004FAF1D
004FAF7C |mov edx,XLCS.004FB088
004FAF81 |call XLCS.00404AA0
004FAF86 |jmp short XLCS.004FAFEF
004FAF88 |lea eax,dword ptr ss:[ebp-1C] ; Case 33 ('3') of switch 004FAF1D
004FAF8B |mov edx,XLCS.004FB094
004FAF90 |call XLCS.00404AA0
004FAF95 |jmp short XLCS.004FAFEF
004FAF97 |lea eax,dword ptr ss:[ebp-1C] ; Case 34 ('4') of switch 004FAF1D
004FAF9A |mov edx,XLCS.004FB0A0
004FAF9F |call XLCS.00404AA0
004FAFA4 |jmp short XLCS.004FAFEF
004FAFA6 |lea eax,dword ptr ss:[ebp-1C] ; Case 35 ('5') of switch 004FAF1D
004FAFA9 |mov edx,XLCS.004FB0AC
004FAFAE |call XLCS.00404AA0
004FAFB3 |jmp short XLCS.004FAFEF
004FAFB5 |lea eax,dword ptr ss:[ebp-1C] ; Case 36 ('6') of switch 004FAF1D
004FAFB8 |mov edx,XLCS.004FB0B8
004FAFBD |call XLCS.00404AA0
004FAFC2 |jmp short XLCS.004FAFEF
004FAFC4 |lea eax,dword ptr ss:[ebp-1C] ; Case 37 ('7') of switch 004FAF1D
004FAFC7 |mov edx,XLCS.004FB0C4
004FAFCC |call XLCS.00404AA0
004FAFD1 |jmp short XLCS.004FAFEF
004FAFD3 |lea eax,dword ptr ss:[ebp-1C] ; Case 38 ('8') of switch 004FAF1D
004FAFD6 |mov edx,XLCS.004FB0D0
004FAFDB |call XLCS.00404AA0
004FAFE0 |jmp short XLCS.004FAFEF
004FAFE2 |lea eax,dword ptr ss:[ebp-1C] ; Case 39 ('9') of switch 004FAF1D
004FAFE5 |mov edx,XLCS.004FB0DC
004FAFEA |call XLCS.00404AA0
004FAFEF |inc ebx ; Default case of switch 004FAF1D
004FAFF0 |dec byte ptr ss:[ebp-21]
004FAFF3 \jnz XLCS.004FAF11
004FAFF9 mov eax,dword ptr ss:[ebp-8]
004FAFFC mov edx,dword ptr ss:[ebp-1C]
004FAFFF call XLCS.00404834
3.算法分析：
程序将注册名分为二组处理
1）第一步：
取第一个注册名和最后一个注册名的10进制ASCII码的个位数。
如‘sky'
's'ASCII码为115,所以A=5;
'y'ASCII码为121，所以B=1；
A=A*7BD；取16进制4位
A=A*B。得出“9905”
2）第二步
将注册名的10进制ASCII码逐个乘以它所在的位置并累加。
如：C='s'*1+'k'*2+'y'*3。
C=C+1E8DEE
得出“2003106”
3)将A连接C得"99052003106"
用上面的数字挨个查表4059617382
得出注册码：22415449047
注册成功后会在xlcs.ini中写入注册名及注册码。
附C语言注册机：很久没用C语言了，也不知结构是否合理:)
#include <stdio.h>
main()
{ int len,i,j,u,v,temp;
char str[15],out[15],*p,a,b,c,table[10]={4,0,5,9,6,1,7,3,8,2};
unsigned long m,n;
printf("\n\nYshsoft(R) little Program ver 1.1\n ");/*版权信息*/
printf(" (C)Copryright Yshsoft Corp 2001-2004.\n");
printf("\nEnter a name "); /*输入及处理*/
scanf("%s",&str);
len=strlen(str);temp=0;n=2002414;
p=str;a=*p;b=*(p+len-1);
a=a%10;b=b%10; /*第一步处理*/
m=a*1981*b;
for(i=0,j=1;i<=len;i++,j++){temp=*(p+i)*j;n=n+temp;}/*第二步处理*/
if(m==0) /*m=0时第一步结果为0*/
{ out[0]=0; u=1;}
else
{
for(i=0;((float)m)/10>0.01;i++){out[i]=m%10;m=m/10;}/*完成数字转字符串及连接*/
u=i;for(i=0;i<u;i++){printf("%d",out[i]);} /*处理的有点罗嗦:)*/
for(i=0,j=u-1;i<j;i++,j--){c=out[i];out[i]=out[j];out[j]=c;}
}
for(i=u;((float)n)/10>0.01;i++){out[i]=n%10;n=n/10;}
v=i;for(i=u;i<v;i++){printf("%d",out[i]);}
for(i=u,j=v-1;i<j;i++,j--){c=out[i];out[i]=out[j];out[j]=c;}
printf("The register is:\n"); /*查表并输出结果*/
for(i=0;i<v;i++)
{printf("%d",str[i]=table[out[i]]);}
}