极速IP搜索II 破解文章
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极速IP搜索II 破解文章:
软件制作平台:VS C#.NET
目的:了解VS.NET软件的破解,制作注册机
本文章只做研究使用!!
由于我答应了法语助手的作者,不再发布它的破解补丁文件:),所以本来要写VB.NET的文章改成了这个C#的文章,反正菩提兄写了详细的VB.NET的破解了:)
过程:
找到ILDASM.exe(好像在vs.net的第三张光盘吧),打开!
拖入SpeedII主程序,开始反汇编...OK
找到注册相关的地方(regB_Click 或 启动监测处),打开!
拷贝的代码如下:
由于不做爆破,所以就不显示字节代码了,主要是算法分析(爆破也简单,一两个字节就行了)
.method private hidebysig instance void regB_Click(object sender,
class [mscorlib]System.EventArgs e) cil managed
{
// Code size 331 (0x14b)
.maxstack 5//堆栈 5个
.locals init (char[] V_0,
char[] V_1,
int32 V_2,0
int32 V_3,1
int32 V_4,2
string V_5,
int32 V_6,
bool V_7,
class [mscorlib]System.IO.StreamWriter V_8,
class [mscorlib]System.Exception V_9)
.try
{
IL_0000: ldc.i4.s 20//压入 20
IL_0002: newarr [mscorlib]System.Char//申明数组
IL_0007: stloc.0//char[]=new str0[20]
IL_0008: ldc.i4.s 20//压入 20
IL_000a: newarr [mscorlib]System.Char//申明数组
IL_000f: stloc.1//char[]=new str1[20]
IL_0010: ldarg.0Arg0
IL_0011: ldfld class [System.Windows.forms]System.Windows.forms.TextBox SpeedIP_II.Reg::userName//很明显,取用户名
IL_0016: callvirt instance string [System.Windows.forms]System.Windows.forms.Control::get_Text()
IL_001b: callvirt instance char[] [mscorlib]System.String::ToCharArray()
IL_0020: stloc.0//str0=username.tochararray(); 将用户名数组=>str0
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&//开始第一组计算
IL_0021: ldc.i4.0//push 0 我按照字符解释为load (下同)
IL_0022: stloc.2//set loc.2=0
IL_0023: br.s IL_0040 jump 40
IL_0025: ldloc.1//load str1
IL_0026: ldloc.2//load loc.2
>>>IL_0027: ldloc.0//load str0
IL_0028: ldloc.2//load loc.2
IL_0029: ldelem.u2//[]
//load str0[loc.2]
/IL_002a: ldloc.2/load loc.2
|IL_002b: ldloc.0// load str0
/ |IL_002c: ldlen// len(str0)
| |IL_002d: conv.i4=======//i4=len(str0)
| \IL_002e: add//add
| /IL_002f: ldloc.0=========// load loc.0
|IL_0030: ldlen// len(loc.0)
| \IL_0031: conv.i4=========//i4=len(loc.0)
\ IL_0032: mul// *
IL_0033: add// +
IL_0034: ldc.i4.s 26// load 26
IL_0036: rem// rem???这是什么
IL_0037: ldc.i4.s 65// load 65
>>>IL_0039: add// add
IL_003a: conv.u2//???
IL_003b: stelem.i2//[]
IL_003c: ldloc.2//load loc.2
IL_003d: ldc.i4.1//1
IL_003e: add//I++
IL_003f: stloc.2//set loc.2=
IL_0040: ldloc.2//load loc.2
IL_0041: ldloc.0//load loc.0
IL_0042: ldlen//求长度
IL_0043: conv.i4//i4=len(name)
IL_0044: blt.s IL_0025//if loc.2&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
初看上面的代码觉得很乱,和菩提那篇介绍的不很一样,而且没有很多的提示,觉得很难理解
呵呵,后来我才发现了原因,解决的方法比较简单,
这个和那些写的很乱的代码很像,如果对上述代码做个下小小的变化
内容就显而易见了.
变化如下:
IL_0021: ldc.i4.0//push 0 我按照字符ld解释为load (下同)
IL_0022: stloc.2//set loc.2=0
IL_0023: br.s IL_0040 jump 40
IL_0025: ldloc.1//load str1
IL_0026: ldloc.2//load loc.2
{
{
{
IL_0027: ldloc.0//load str0
IL_0028: ldloc.2//load loc.2
IL_0029: ldelem.u2//[]
//load str0[loc.2] arg0
}
{
{
IL_002a: ldloc.2/load loc.2 arg1
{
IL_002b: ldloc.0// load str0 //三行看作一个arg
IL_002c: ldlen// len(str0)
IL_002d: conv.i4=======//i4=len(str0) arg2
}
IL_002e: add//add 运算
//也就是arg1+arg2=>arg1+len(str0)===> arg3
}
{
IL_002f: ldloc.0=========// load loc.0
IL_0030: ldlen// len(loc.0)
IL_0031: conv.i4=========//i4=len(loc.0)
}
arg4=len(str0)
IL_0032: mul// * 运算 fsarg3*arg4=>arg5
}
IL_0033: add// +
}
IL_0034: ldc.i4.s 26// load 26
IL_0036: rem// rem???这是什么 这个就是取模运算啦
//当初还以为是注释语句,哈哈,汇编代码也要注释?呵呵
IL_0037: ldc.i4.s 65// load 65
IL_0039: add// add
}
IL_003a: conv.u2//??? 哦这个就是将上述的结果conv一下
IL_003b: stelem.i2//[] set elem i2?
结合上面的语句不难看出
//IL_0025: ldloc.1//load str1
//IL_0026: ldloc.2//load loc.2
//RESULT
//setelem.i2
//哦,str1[loc.2]=RESULT
IL_003c: ldloc.2//load loc.2
IL_003d: ldc.i4.1//1
IL_003e: add//I++
IL_003f: stloc.2//set loc.2=loc.2+1
//很明显,循环索引值嘛
IL_0040: ldloc.2//load loc.2
IL_0041: ldloc.0//load loc.0
IL_0042: ldlen//求长度
IL_0043: conv.i4//i4=len(name)
IL_0044: blt.s IL_0025//if loc.2
分析,上述过程之所以看起来很复杂的原因是因为使用了套嵌,也就是编程使用了(),哈哈
所以上述的过程的算法为,VB表示
str0=name
for i=0 to len(str0)-1
str1[lndex]=((str0[index]+(index+len(str0))*len(str0)) mod 26) +65
next
作用是将注册码限制到[A-Z]之间
看懂了这一段的话,下面的两段代码简直和看源代码一样啦
后面不作详细解释,我将各段用空行隔开了,只要记住
数据操作总是这样的形式
push arg1
push arg2
operate
找到两个参数,和一个运算就行了,简单的很,
也就是所说的堆栈操作了,没有寄存器,看起来很别扭:)
就是套嵌看起来很复杂
要是可以做到和vs.net的代码操作一样,可以将代码收缩的话,哈哈!
***********************************************
IL_0046: ldloc.0
IL_0047: ldlen
IL_0048: conv.i4
IL_0049: stloc.3//set loc.3=len(str0) //Index
IL_004a: br.s IL_0061//Jump
IL_004c: ldloc.1//str1[i]
IL_004d: ldloc.3
IL_004e: ldloc.0
IL_004f: ldc.i4.0
IL_0050: ldelem.u2
IL_0051: ldloc.3
IL_0052: mul
IL_0053: ldloc.3
IL_0054: mul
IL_0055: ldc.i4.s 26
IL_0057: rem
IL_0058: ldc.i4.s 65
IL_005a: add
IL_005b: conv.u2
IL_005c: stelem.i2
IL_005d: ldloc.3//i
IL_005e: ldc.i4.1//1
IL_005f: add//i=i+1
IL_0060: stloc.3
IL_0061: ldloc.3//round
IL_0062: ldc.i4.s 10//?<10
IL_0064: blt.s IL_004c
***********************************************
上述运算
for Index=len(str0) to 10-1
str1[Index]=(str0[0]*Index*Index mod 26) +65
next
============================================
IL_0066: ldc.i4.s 10
IL_0068: stloc.s V_4
IL_006a: br.s IL_0087
IL_006c: ldloc.1//str1
IL_006d: ldloc.s V_4
IL_006f: ldloc.0
IL_0070: ldloc.0
IL_0071: ldlen
IL_0072: conv.i4
IL_0073: ldc.i4.1
IL_0074: sub
IL_0075: ldelem.u2
IL_0076: ldloc.s V_4
IL_0078: mul
IL_0079: ldc.i4.s 26
IL_007b: rem
IL_007c: ldc.i4.s 65
IL_007e: add
IL_007f: conv.u2
IL_0080: stelem.i2
IL_0081: ldloc.s V_4
IL_0083: ldc.i4.1
IL_0084: add
IL_0085: stloc.s V_4
IL_0087: ldloc.s V_4
IL_0089: ldc.i4.s 20
IL_008b: blt.s IL_006c
==============================================
For Index=10 to 20-1
str1[Index]=(str0[len(str0)-1]*Index mod 26) +65
Next
到此,注册码的计算完成了,呵呵,还是较简单的吧
一共20位的注册码,这种算法是不行地:)
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IL_008d: ldstr "SpeedIPII-"
IL_0092: stloc.s V_5
IL_0094: ldc.i4.0
IL_0095: stloc.s V_6
IL_0097: br.s IL_00b5
IL_0099: ldloc.s V_5
IL_009b: ldloc.1
IL_009c: ldloc.s V_6
IL_009e: ldelema [mscorlib]System.Char
IL_00a3: call instance string [mscorlib]System.Char::ToString()
IL_00a8: call string [mscorlib]System.String::Concat(string,
string)
IL_00ad: stloc.s V_5 //最后将"SpeedIPII-" + 注册码=>完整的注册码
IL_00af: ldloc.s V_6
IL_00b1: ldc.i4.1
IL_00b2: add
IL_00b3: stloc.s V_6
IL_00b5: ldloc.s V_6
IL_00b7: ldc.i4.s 20
IL_00b9: blt.s IL_0099//采用循环读取每个字节的方式
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IL_00bb: ldloc.s V_5
IL_00bd: ldarg.0
IL_00be: ldfld class [System.Windows.forms]System.Windows.forms.TextBox SpeedIP_II.Reg::userCode//读取输入的注册码
IL_00c3: callvirt instance string [System.Windows.forms]System.Windows.forms.Control::get_Text()
IL_00c8: callvirt instance bool [mscorlib]System.String::Equals(string)//=?
IL_00cd: stloc.s V_7
IL_00cf: ldloc.s V_7
IL_00d1: brfalse.s IL_0122// 如果不.则跳到122给你警告啦! 爆破也在这里啦
不过应该在启动的时候爆破,这里没有意义
IL_00d3: ldstr "ProgrameMessage.dll"
IL_00d8: call class [mscorlib]System.IO.StreamWriter [mscorlib]System.IO.file::CreateText(string)
IL_00dd: stloc.s V_8
IL_00df: ldloc.s V_8
IL_00e1: ldarg.0
IL_00e2: ldfld class [System.Windows.forms]System.Windows.forms.TextBox SpeedIP_II.Reg::userName
IL_00e7: callvirt instance string [System.Windows.forms]System.Windows.forms.Control::get_Text()
IL_00ec: callvirt instance void [mscorlib]System.IO.TextWriter::WriteLine(string)
IL_00f1: ldloc.s V_8
IL_00f3: ldarg.0
IL_00f4: ldfld class [System.Windows.forms]System.Windows.forms.TextBox SpeedIP_II.Reg::userCode
IL_00f9: callvirt instance string [System.Windows.forms]System.Windows.forms.Control::get_Text()
IL_00fe: callvirt instance void [mscorlib]System.IO.TextWriter::WriteLine(string)
IL_0103: ldloc.s V_8
IL_0105: callvirt instance void [mscorlib]System.IO.TextWriter::Close()
IL_010a: ldstr bytearray (E8 6C 8C 51 10 62 9F 52 01 FF 1F 61 22 8C A8 60 // .l.Q.b.R...a"..`
84 76 E8 6C 8C 51 01 FF 08 FF F7 8B CD 91 B0 65 // .v.l.Q.........e
2F 54 A8 52 6F 8F F6 4E 09 FF ) // /T.Ro..N..
//上面的这段数组,猜都能猜到是信息文字啦,那是什么呢,怎么看?
//很简单阿,用一个Unicode=>ASCII的显示工具就可以看到了
//正好做了一个小工具,显示看看
//"注册成功！感谢您的注册！（请重新启动软件）"
//哈哈,等的就是这个啦
IL_010f: ldstr bytearray (D0 63 3A 79 E1 4F 6F 60 ) // .c:y.Oo`
IL_0114: call valuetype [System.Windows.forms]System.Windows.forms.DialogResult [System.Windows.forms]System.Windows.forms.MessageBox::Show(string,
string)
IL_0119: pop
IL_011a: ldarg.0
IL_011b: call instance void [System.Windows.forms]System.Windows.forms.form::Close()
IL_0120: br.s IL_0132
IL_0122: ldstr bytearray (F9 5B 0D 4E 77 8D 01 FF A8 60 40 62 93 8F 65 51 // .[.Nw....`@b..eQ
84 76 28 75 37 62 0D 54 8C 54 E8 6C 8C 51 01 78 // .v(u7b.T.T.l.Q.x
0D 4E 26 7B 01 FF ) // .N&{..
IL_0127: ldstr bytearray (D0 63 3A 79 E1 4F 6F 60 ) // .c:y.Oo`
IL_012c: call valuetype [System.Windows.forms]System.Windows.forms.DialogResult [System.Windows.forms]System.Windows.forms.MessageBox::Show(string,
string)
//"对不起！您所输入的用户名和注册码不符！"
IL_0131: pop
IL_0132: leave.s IL_014a
} // end .try
catch [mscorlib]System.Exception
{
IL_0134: stloc.s V_9
IL_0136: ldloc.s V_9
IL_0138: callvirt instance string [mscorlib]System.Exception::get_Message()
IL_013d: ldstr bytearray (D0 63 3A 79 E1 4F 6F 60 ) // .c:y.Oo`
IL_0142: call valuetype [System.Windows.forms]System.Windows.forms.DialogResult [System.Windows.forms]System.Windows.forms.MessageBox::Show(string,
string)
IL_0147: pop
IL_0148: leave.s IL_014a
} // end handler
IL_014a: ret
} // end of method Reg::regB_Click
这是继法语助手Vb.net后我破解的第二个.net软件,
不过由于使用了一句语句的运算,使得结构看起来比较乱,还好搞定了!:)
哈哈,发文章了,好长时间没写了,手生了!
注册机的话,用VBs写就行了,反正简单,不写了!:)
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