Delphi Indy10 required SSL libraries under Linux?

Question

Using Delphy 10.4: I am trying to start a IdTCPServer with IdServerIOHandlerSSLOpenSSL. Under Linux, I get a "EIdOSSLCouldNotLoadSSLLibrary; Could not load SSL library." Under Windows, this works fine.

In the SSL directory, I now have both the Windows DLL's, and the .so files which I generated by compiling the "openssl-1.1.1j" .

So the SSL directory contains libeay32.dll, ssleay32.dll, libcrypto.so, libssl.so.

Why does it not accept it under Linux?

Answer 1

First, you can't use Windows DLLs on Linux. You need Linux binaries, and on Linux TIdSSLIOHandlerSocketOpenSSL will be looking for libssl.so.xxx[l] and libcrypto.so.xxx[l] (where xxx is the version 1.0.2 or lower, and [l] is an optional letter a..z , or libssl.so / libcrypto.so symlinks that map to such versions).

Second, TIdSSLIOHandlerSocketOpenSSL , and by extension TIdServerIOHandlerSSLOpenSSL , does not support OpenSSL 1.1.x , only OpenSSL 1.0.2 and earlier, as you can see above.

To use OpenSSL 1.1.x, you need to use a different IOHandler . One is currently in a pull request awaiting review, and so has not been merged into Indy's main code yet, but you can try it and see if it works for you:

#299 Added new OpenSSL IO Handler for OpenSSL 1.1.1