Linux服务端安装libsodium支持chacha20

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

CentOS:

yum 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/1.0.12/libsodium-1.0.12.tar.gz

tar xf libsodium-1.0.12.tar.gz && cd libsodium-1.0.12

./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/1.0.12/libsodium-1.0.12.tar.gz

tar xf libsodium-1.0.12.tar.gz && cd libsodium-1.0.12

./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 参考作者原文：
https://github.com/breakwa11/shadowsocks-rss/wiki/libsodium