[openssl-users] Binary Distribution DLL Names

Matt Caswell matt at openssl.org
Fri Jan 18 16:27:59 UTC 2019

On 18/01/2019 11:51, Grahame Grieve wrote:
> I got no response to this. I presume that mean that this is a stupid question,
> but I'm afraid I don't understand why
> Grahame
> On Mon, Jan 14, 2019 at 11:45 PM Grahame Grieve
> <grahame at healthintersections.com.au <mailto:grahame at healthintersections.com.au>>
> wrote:
>     Hi
>     I have a 64bit windows application that uses openSSL, and I am using the
>     indy distribution from https://indy.fulgan.com/SSL/. This makes the file
>     names of the openssl dlls libeay32.dll and ssleay32.dll (even though they
>     are 64bit).

That distribution is OpenSSL 1.0.2 which uses those old names.

> Other distributions use other names (libcrypto-XX-x64.dll etc)

Other distributions you have seen are probably using OpenSSL 1.1.0 or 1.1.1
which use the new names.

>     I believe that the filename variations are at the root of an issue I have
>     with openSSL. My symptoms are this: when I run my unit tests that do (among
>     other things) a bunch of tests of my SSL server, all is good. However,
>     anytime I load the mysql odbc driver into the memory space, I get an memory
>     corruption problem in libeay32.dll when shutting down. Google suggests that
>     this is due to a build mismatch between the two dlls... I'm guessing that
>     mysql is loading some other dll variant of openssl and some build mismatch
>     is arising ? 
>     I'm clutching at straws here, but has this been an issue before? is there
>     any policy issue around distrubution filenames? Is there any other likely
>     cause why loading the mysql odbc driver causes memory corruptions in openssl
>     when shutting down? 

I've not seen it before. The distribution filenames vary based on the version of
OpenSSL you are using.


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