|  Python   |    libev    |     Go    |     Qt

------------------ | --------- | ----------- | ----------| --------- SSL library (AES, etc) | Y | Y | Y | Y RC4-MD5 | Y | Y | Y | Y Salsa20, Chacha20 | Y | Y | Y | Y

For supported ciphers, please refer to Cipher page in shadowsocks.org.

Installing M2Crypto will make encryption a little faster.

Debian:

apt-get install python-m2crypto

CentOS:

yum install m2crypto

rc4-md5 is a safe, fast encryption that use different key per connection. It is recommended for OpenWRT routers.

salsa20 and chacha20 are fast stream ciphers. Optimized salsa20 implementation on x86_64 is even 2x faster than rc4 (but slightly slower on ARM).

Install libsodium >= 1.0.0 if you want to use them.

sudo apt-get install build-essential
wget https://github.com/jedisct1/libsodium/releases/download/1.0.8/libsodium-1.0.8.tar.gz
tar xf libsodium-1.0.8.tar.gz && cd libsodium-1.0.8
./configure && make -j2
sudo make install
sudo ldconfig

These legacy ciphers are either slow or not safe. Do not use them:

• rc4
• des-cfb
• table
• salsa20-ctr