Compile OpenSSL 1.0.2* from source on CentOS 7

compile-openssl_102.sh

# Make sure you have these installed
yum install -y make gcc perl pcre-devel zlib-devel
# Download/Extract source
wget -O /tmp/openssl.tgz https://www.openssl.org/source/openssl-1.0.2-latest.tar.gz
tar -zxf /tmp/openssl.tgz -C /tmp
cd /tmp/openssl-*
# Optional: Patch chacha20
# https://github.com/cloudflare/sslconfig/tree/master/patches
wget https://raw.githubusercontent.com/cloudflare/sslconfig/master/patches/openssl__chacha20_poly1305_draft_and_rfc_ossl102j.patch
patch -p1 < openssl__chacha20_poly1305_draft_and_rfc_ossl102j.patch
# Compile/Install OpenSSL
./config --prefix=/usr --openssldir=/etc/ssl --libdir=lib no-shared zlib-dynamic
make depend
make && make install