c++ - 每次重新编译后exe校验和不同

Question

所以我试图弄清楚如何让我的 exe 在重新编译时具有相同的哈希码/校验和。我正在使用 FastSum 生成校验和。目前，没有进行任何代码更改，我只是在 VS 中重建项目，校验和结果不同。代码是用 C++ 编写的。

我不熟悉以这种方式使用哈希码和/或校验和，但我做了一些研究并阅读了一些关于需要一致 GUID 的内容。但我不知道这将如何与校验和生成程序联系起来......

好吧，我先把它留在那里，先谢谢了。

Answer 1

Have you examined the differences between the exes? I suspect the compiler/linker is inserting the date or time into the binary and as a result each binary will be different from another. Or it could be worse, sometimes compilers/linkers build static tables in their own system memory then copy that into the binary, say you have 9 bytes of something and for alignment reasons the compiler chooses to use 12 bytes in the binary, I have seen compilers/linkers take whatever 3 bytes are in system memory of that computer and copy that into the file. Ideally you would want the tools to zero out memory they are using for such a thing so you get repeatable results.

Basically do a binary diff between the files you should then find out why they dont match.

Answer 2

据我回忆，EXE 格式包含一个构建时间戳，因此 exe 的哈希值（包括该时间戳）会在每次重新编译时发生变化。

Answer 3

这是托管二进制文件吗？托管二进制文件有一个 GUID 部分，该部分会随着构建的变化而变化，您无能为力来阻止它。

您可以通过运行“link /dump /all [filename]”或“link /dump /disasm [filename]”来更好地查看二进制文件中的更改。/all 选项将向您显示所有十六进制值以及它们的 ascii 等效项，而 /disasm 选项将反汇编代码并以汇编形式显示给您，这样更易​​于阅读，但可能会忽略一些可能存在的细微差异导致哈希发生变化。