Update OpenSSL to 3.0 on CentOS 7

Prerequisites

Use sudo when needed.

Install perl-IPC-Cmd and perl-Test-Simple:

sudo yum install perl-IPC-Cmd perl-Test-Simple

yum install -y make gcc perl-core pcre-devel wget zlib-devel

Go to OpenSSL’s download page and copy the link to the latest version. At this time it’s 3.0.0. Then run (adapt the command to reflect your version):

cd /usr/src
wget https://www.openssl.org/source/openssl-3.0.0.tar.gz
tar -zxf openssl-3.0.0.tar.gz
rm openssl-3.0.0.tar.gz

Compile, make, test and install OpenSSL:

cd /usr/src/openssl-3.0.0
./config
make
make test
make install

Create symlinks to libssl and libcrypto:

ln -s /usr/local/lib64/libssl.so.3 /usr/lib64/libssl.so.3
ln -s /usr/local/lib64/libcrypto.so.3 /usr/lib64/libcrypto.so.3

Test the installed version with:

openssl version

You should get something like this:

OpenSSL 3.0.0 7 sep 2021 (Library: OpenSSL 3.0.0 7 sep 2021)