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1. 发明申请

US20100058301A1 SYSTEM AND METHOD FOR BRANCH EXTRACTION OBFUSCATION 有权
标题翻译：分支抽取障碍的系统与方法
公开(公告)号：US20100058301A1
公开(公告)日：2010-03-04
申请号：US12198873
申请日：2008-08-26
申请人： Ginger M. MYLES , Julien Lerouge , Tanya Michelle Lattner , Augustin J. Farrugia
发明人： Ginger M. MYLES , Julien Lerouge , Tanya Michelle Lattner , Augustin J. Farrugia
IPC分类号： G06F9/45
CPC分类号： G06F8/41 , G06F8/447 , G06F9/44521 , G06F21/14
摘要： Disclosed herein are systems, methods, and computer readable-media for obfuscating code. The method includes extracting a conditional statement from a computer program, creating a function equivalent to the conditional statement, creating a pointer that points to the function, storing the pointer in an array of pointers, replacing the conditional statement with a call to the function using the pointer at an index in the array, and during runtime of the computer program, dynamically calculating the index corresponding to the pointer in the array. In one aspect, a subset of instructions is extracted from a path associated with the conditional statement and the subset of instructions is placed in the function to evaluate the conditional statement. In another aspect, the conditional statement is replaced with a call to a select function that (1) calculates the index into the array, (2) retrieves the function pointer from the array using the index, and (3) calls the function using the function pointer. Calls can be routed through a select function before the function pointer is used to call the function evaluating the conditional statement. Each step in the method can be applied to source code of the computer program, an intermediate representation of the computer program, and assembly code of the computer program.
摘要翻译：这里公开了用于模糊代码的系统，方法和计算机可读介质。该方法包括从计算机程序中提取条件语句，创建等价于条件语句的函数，创建指向函数的指针，将指针存储在指针数组中，使用对函数的调用替换条件语句数组中的索引处的指针，以及在计算机程序的运行期间，动态地计算与数组中的指针相对应的索引。在一个方面，从与条件语句相关联的路径中提取指令子集，并将指令子集置于函数中以评估条件语句。在另一方面，条件语句被替换为select函数的调用，（1）计算数组中的索引，（2）使用索引从数组中检索函数指针，（3）使用函数指针。在使用函数指针调用评估条件语句的函数之前，可以通过select函数路由调用。该方法中的每一步都可以应用于计算机程序的源代码，计算机程序的中间表示和计算机程序的汇编代码。

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