CHACHA20 is a cipher based on Salsa20, a famous stream cipher. It is included in the libsodium.

Install dependencies

yum install m2crypto gcc -y

Download and Install libsodium

wget https://download.libsodium.org/libsodium/releases/LATEST.tar.gz 
tar zvxf LATEST.tar.gz 
cd libsodium-* 
./configure 
make && make install

Add the file path to environment variable

echo "/usr/local/lib" >> /etc/ld.so.conf
ldconfig

Credit

D0zingcat