Cygwin DLLs being modified somehow?

Andrey Repin
Mon Feb 23 11:17:00 GMT 2015

Greetings, Michael DePaulo!

> I am seeing very weird behavior and I am hoping that someone can explain it.

> This happens on 2 different machines. My personal Windows 10 64-bit
> machine, and a Windows 7 64-bit VM hosted by the X2Go project on
> another continent.

> It seems to be happening to multiple DLLs, but I will list one example below.

> I install 32-bit Cygwin with the 2.870 installer

> libopenssl100 is one of the packages that gets installed. It is at
> version. 1.0.1k-1

> /bin/cygcrypto-1.0.0.dll always appears to be 1,820,199 bytes, and it
> always appears to be last modified on 1/8/2015 20:30 UTC.

> When I extract it from the tarball:
> Its md5sum is:
> c79b900428d91e5882c24bbb6bc36969
> And its sha256sum is:
> 53376a3d69be996cb71abda41b7cc6bea7a599b027fe819323fafc3c433b7767

> Yet on both systems, once installed, its m5sum and sha1sum differ!

> On my personal machine
> 8b6881e6aab4b8438a6db784003a39fb
> 0a4db441c5faff305b28bcddbaeae91d824ed7b39146a55f423d970d362fe6df

> On the X2Go project machine:
> 3ebfce45e66f227bc8f753ad1ef314a7
> 9305561f1417f2121ae2f05fd64ca9405814f757ab1eee8a4746963520e1724f

> I do not know assembly. Another X2Go Developer, Mihai Moldovan (CC'd)
> and I took a brief look at the disassembled output from objdump. It
> looks like the addresses differ.

It's called rebase.

Andrey Repin ( 23.02.2015, <06:10>

Sorry for my terrible english...

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