使用 salsa20 或 chacha20 或 chacha20-ietf 算法，需要安装 libsodium ，否则就算在config.json里面设置成chacha20也会提示method not supported.

centos：

yum -y groupinstall "Development Tools"
wget https://github.com/jedisct1/libsodium/releases/download/1.0.11/libsodium-1.0.11.tar.gz
tar xf libsodium-1.0.11.tar.gz && cd libsodium-1.0.11
./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/1.0.11/libsodium-1.0.11.tar.gz
tar xf libsodium-1.0.11.tar.gz && cd libsodium-1.0.11
./configure && make -j2 && make install
ldconfig