Usage:
./iperf.sh <data size> <method>
e.g.
./iperf.sh 1G rc4-md5
methods:
rc4-md5, aes-128-gcm, aes-192-gcm, aes-256-gcm, aes-128-cfb, aes-192-cfb, aes-256-cfb, aes-128-ctr, aes-192-ctr, aes-256-ctr, bf-cfb, camellia-128-cfb, camellia-192-cfb, camellia-256-cfb, chacha20-ietf-poly1305, salsa20, chacha20 and chacha20-ietf.