OpenSSL usage on Linux Distros


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# 1  
OpenSSL usage on Linux Distros

Hi,

My server is Centos 6 i686.
Is it possible get an openssl download from this site
Code:
"https://www.openssl.org/source/"

(which is used for 64 bit platforms)
and use it on 32 bit platforms also?


Thx,
Aigini
# 2  
You can build 32 bit on 64 bit source, like this, for example:

Code:
 gcc -m32 my64bitsource.c -o my32bitout

So, take a look at the -m32 flag and any additional libs you might need to link in.

So, yes, it is certainly possible, to answer your question (building the source).
# 3  
Thanks for the suggestion.
But I am not sure how to get the "my64bitsource.c" file in the command.


Because if we install the source rpm like this :


Code:
# rpm -i openssl-0.9.8e-12.el5_4.6.src.rpm

then we will get a file like this in rpmbuild/SOURCES :
Code:
openssl.spec

And the command to patch, configure and compile is like this :


Code:
# rpmbuild -ba openssl.spec

So how does the my64bitsource.c come into the picture, and how do we use the above commands in this case.
# 4  
Check your manual for rpmbuild, specifically the --target PLATFORM option. As Neo pointed out you will need some 32 bit libraries installed on your 64 bit OS to be available to do this cross compiling.
# 5  
Hi,


Thanks for all the suggestions, however, my OS is not 64 bit. It is 32 bit.
But I am not sure if the installer (source) for OpenSSL from this site "https://www.openssl.org/source/" is 64 bit or 32 bit as it does not clearly mention anything about the OpenSSL packages available there.


So the reason that I post the question in this forum is because I think that the OpenSSL package that I download from the link above is 64 bit, and I need to use (compile/install) it on a 32 bit system.
# 6  
You can compile 64 bit source code on 32 bit architecture.

For example, with gcc:

Code:
gcc -m32 my64bitcode.c -o my32bitcodeout

You may need to install gcc-multlib by using the following commands (ubuntu examples):

For C :
Code:
sudo apt-get install gcc-multilib

For C++:
Code:
sudo apt-get install g++-multilib

You can easily Google this situation and find many solutions.
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