📄 chap7-2.htm.primary
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sbb eax, FFFFFFFF <br>
:77A12A18 85C0
test eax, eax <br>
:77A12A1A 7F45
jg 77A12A61 <br>
:77A12A1C 7D16
jge 77A12A34 <br>
:77A12A1E 33C0
xor eax, eax <br>
<br>
看来有必要仔细看一下oleaut32.dll</span></p>
<p> </p>
<p> </p>
<p><u><font color="#FF3366"><b><font face="Times New Roman"><span class="p9"><span class="p9"><a name="5"></a>五、Visual Basic
程序</span></span></font><span class="p9"><font face="宋体">比较方法</font> </span></b></font></u></p>
<p> <span class="p9"><font face="宋体" color="#000000">在</font> <font face="Times New Roman" color="#000000"> Visual Basic</font>
<font face="宋体" color="#000000">里有</font> <font face="Times New Roman" color="#000000">8</font>
<font face="宋体" color="#000000">种以上的方法检测正确的序列号</font> <font face="Times New Roman" color="#000000">/</font>
<font face="宋体" color="#000000">密码。我这里将谈谈这</font> <font face="Times New Roman" color="#000000">8</font>
<font face="宋体" color="#000000">种方法，它们都是较容易并用得较多。首先是最普通的</font> <font face="Times New Roman" color="#000000">3</font>
<font face="宋体" color="#000000">种：</font> </span></p>
<p> <span class="p9"><font face="Times New Roman" color="#0000FF">1)</font> <font face="宋体" color="#0000FF">串（</font><font color="#0000FF">string)
<font face="宋体">比较</font></font></span></p>
<p> <span class="p9"><font face="宋体" color="#000000">在这比较方法里，正确密码串如：</font> <font face="Times New Roman" color="#000000">"Correct Password"</font>
<font face="宋体" color="#000000">和你输入的密码串如：</font> <font face="Times New Roman" color="#000000">"Entered Password"</font>
<font face="宋体" color="#000000">比较。</font> </span></p>
<p> <span class="p9"><font face="宋体" color="#000000">串是由相邻的字符按顺序排列组成，一个串包括字母、数字、空格和标点符号。一个固定长度的串可储存</font>
<font face="Times New Roman" color="#000000">0</font> <font face="宋体" color="#000000">到</font>
<font face="Times New Roman" color="#000000">63K</font> <font face="宋体" color="#000000">字符。如是动态的串其储存字符个数可达</font>
<font face="Times New Roman" color="#000000">20</font> <font face="宋体" color="#000000">亿字符。</font>
</span> <span class="p9"><font face="Times New Roman" color="#000000"> </font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">VB</font> <font face="宋体" color="#000000">串比较代码一般格式：</font>
</span></p>
<p> </p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">If "Correct Password" = "Entered Password" then <--</font>
<font face="宋体" color="#000000">直接比较两个串字符</font> </span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">GoTo Correct Message </font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">Else </font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">GoTo Wrong Message </font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">End if</font>
</span></p>
<p> </p>
<p> <span class="p9"><font face="宋体" color="#000000">这是一种简单保护方案，如果程序者用这种函数保护，用</font>
<font face="Times New Roman" color="#000000">SOFTICE</font> <font face="宋体" color="#000000">很容易拦截。</font>
</span></p>
<p> </p>
<p> <span class="p9"><font face="宋体" color="#000000">可用到的断点：</font> </span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">i) __vbastrcomp or __vbastrcmp </font>
<font face="宋体" color="#000000">（下划线是两短线</font> <font face="Times New Roman" color="#000000">_</font>
<font face="宋体" color="#000000">组成）</font> <font face="Times New Roman" color="#000000"> <--</font>
<font face="宋体" color="#000000">串比较函数</font> </span></p>
<p> </p>
<p> <span class="p9"><font face="宋体" color="#000000">注意：如果你是</font> <font face="Times New Roman" color="#000000">crack VB6</font>
<font face="宋体" color="#000000">程序，你应在两断点前增加</font> <font face="Times New Roman" color="#000000">msvbvm60!</font>
<font face="宋体" color="#000000">。</font> </span></p>
<p> <span class="p9"><font face="宋体" color="#000000">如：</font> <font face="Times New Roman" color="#000000"> bpx msvbvm60!__vbastrcomp or bpx msvbvm60!__vbastrcmp</font>
</span></p>
<p> </p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">ii)</font> <font face="宋体" color="#000000">搜索特殊比较代码（具体参考下一节）</font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000"> </font>
<font face="宋体" color="#000000">如：</font> <font face="Times New Roman" color="#000000">56,57,8b,7c,24,10,8b,74,24,0c,8b,4c,24,14,33,c0,f3,66,a7 </font>
</span> <span class="p9"><font face="Times New Roman" color="#000000"> </font>
</span></p>
<p> </p>
<p> <font color="#3333FF"><span class="p9"><font face="Times New Roman">2) </font>
<font face="宋体">变量</font><font color="#3333FF"><span class="p9">（</span></font><font face=verdana,arial,helvetica size=2>Variant</font>）<font face="宋体">比较</font>
</span></font></p>
<p> <span class="p9"><font face="宋体" color="#000000">在这方法中，两个变量（变量数据类型）互相比较。变量数据类型是一种特殊数据类型，包括数字、字符串或日期数据及一些用户定义的类型。这种类型储存数字长度是</font>
<font face="Times New Roman" color="#000000">16</font> <font face="宋体" color="#000000">字节或字符</font>
<font face="Times New Roman" color="#000000">22</font> <font face="宋体" color="#000000">字节（加上串长度）。</font>
</span></p>
<p> </p>
<p> <span class="p9"><font face="宋体" color="#000000">一个范例代码：</font> </span></p>
<p> </p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">Dim correct As Variant, entered As Variant <--</font>
<font face="宋体" color="#000000">定义</font> <font face="Times New Roman" color="#000000">"correct" and "entered" </font>
<font face="宋体" color="#000000">作为变量</font> </span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">correct = Correct Password <--</font>
<font face="宋体" color="#000000">设置</font> <font face="Times New Roman" color="#000000"> "correct"</font>
<font face="宋体" color="#000000">放置</font> <font face="Times New Roman" color="#000000">"Correct Password" </font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">entered = Text1.Text <--</font>
<font face="宋体" color="#000000">设置</font> <font face="Times New Roman" color="#000000"> "entered" </font>
<font face="宋体" color="#000000">作为你输入密码</font> <font face="Times New Roman" color="#000000"> </font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">If correct = entered Then <--</font>
<font face="宋体" color="#000000">用变量方法比较</font> <font face="Times New Roman" color="#000000"> </font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">GoTo Correct Message </font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">Else </font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">GoTo Wrong Message </font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">End If</font>
</span></p>
<p> </p>
<p> <span class="p9"><font face="宋体" color="#000000">在这方法里，</font> <font face="Times New Roman" color="#000000">1</font>
<font face="宋体" color="#000000">中的两个断点将不起作用，因为程序不再用</font> </span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">__vbastrcomp </font>
<font face="宋体" color="#000000">等</font> <font face="Times New Roman" color="#000000">...</font>
</span></p>
<p> </p>
<p> <span class="p9"><font face="宋体" color="#000000">有用断点</font> <font face="Times New Roman" color="#000000"> </font>
<font face="宋体" color="#000000">：</font> </span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">i) __vbavartsteq <--</font>
<font face="宋体" color="#000000">测试变量是否相等</font> </span></p>
<p> </p>
<p> <span class="p9"><font face="宋体" color="#000000">注意：如果你是</font> <font face="Times New Roman" color="#000000">crack VB6</font>
<font face="宋体" color="#000000">程序，你应在两断点前增加</font> <font face="Times New Roman" color="#000000">msvbvm60!</font>
<font face="宋体" color="#000000">。</font> </span></p>
<p> <span class="p9"><font face="宋体" color="#000000">例：</font> <font face="Times New Roman" color="#000000"> bpx msvbvm60!__vbavartsteq </font>
</span> <span class="p9"><font face="Times New Roman" color="#000000"> </font>
</span></p>
<p> </p>
<p> <font color="#0000FF"><span class="p9"><font face="Times New Roman">3)</font>
<font face="宋体">长整型（</font> <font face="Times New Roman">long)</font> <font face="宋体">比较</font>
</span></font></p>
<p> <span class="p9"><font face="宋体" color="#000000">这也是一个普通的方法。两个变量（长整型）互相比较。</font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">long</font>
<font face="宋体" color="#000000">型数据类型是</font> <font face="Times New Roman" color="#000000">4</font>
<font face="宋体" color="#000000">字节（</font> <font face="Times New Roman" color="#000000">32</font>
<font face="宋体" color="#000000">位）整数，其范围</font> <font face="Times New Roman" color="#000000">-2,147,483,648 </font>
<font face="宋体" color="#000000">到</font> <font face="Times New Roman" color="#000000"> 2,147,483,647</font>
<font face="宋体" color="#000000">。因此该种方法存在只能比较数字的局限性。</font> </span></p>
<p> <span class="p9"><font face="宋体" color="#000000">一个此类型范例：</font> </span></p>
<p> </p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">Dim correct As Long, entered As Long <--</font>
<font face="宋体" color="#000000">定义</font> <font face="Times New Roman" color="#000000"> "correct" </font>
<font face="宋体" color="#000000">和</font> <font face="Times New Roman" color="#000000"> "entered" </font>
<font face="宋体" color="#000000">作为长整型</font> </span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">correct = 12345 <--</font>
<font face="宋体" color="#000000">设置</font> <font face="Times New Roman" color="#000000">"correct"</font>
<font face="宋体" color="#000000">为正确密码</font> </span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">entered = Text1.Text <--</font>
<font face="宋体" color="#000000">设置</font> <font face="Times New Roman" color="#000000"> "entered"</font>
<font face="宋体" color="#000000">为输入密码</font> </span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">If entered = correct Then <--</font>
<font face="宋体" color="#000000">用长整型方法比较</font> <font face="Times New Roman" color="#000000"> </font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">GoTo Correct Message </font>
</span></p>
<p> <span class="p9"><font face="Times New Roman" color="#000000">Else </font>
</span></p>
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