centos：

yum install epel-release
yum install libsodium
如果想自己编译，那么可以用以下的命令

yum -y groupinstall "Development Tools"
wget https://github.com/jedisct1/libsodium/releases/download/1.0.15/libsodium-1.0.15.tar.gz
tar xf libsodium-1.0.15.tar.gz && cd libsodium-1.0.15
./configure && make -j2 && make install
echo /usr/local/lib > /etc/ld.so.conf.d/usr_local_lib.conf
ldconfig

ubuntu/debian：

apt-get install build-essential
wget https://github.com/jedisct1/libsodium/releases/download/1.0.15/libsodium-1.0.15.tar.gz
tar xf libsodium-1.0.15.tar.gz && cd libsodium-1.0.15
./configure && make -j2 && make install
ldconfig
如果曾经安装过旧版本，亦可重复用以上步骤更新到最新版，仅1.0.4或以上版本支持chacha20-ietf