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Check speed of ssh cipher(s) on your system
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#!/bin/bash | |
# Based on: http://www.systutorials.com/5450/improving-sshscp-performance-by-choosing-ciphers/#comment-28725 | |
# | |
# You should set up PublicKey authentication so that you don't have to type your | |
# password for every cipher tested. | |
set -o pipefail | |
ciphers="$@" | |
if [[ -n "$ciphers" ]]; then echo "User-supplied ciphers: $ciphers"; fi | |
if [[ -z "$ciphers" ]]; then | |
ciphers=$(egrep '^\s*Ciphers' /etc/ssh/sshd_config|sed 's/Ciphers//; s/,/ /') | |
if [[ -n "$ciphers" ]]; then echo "/etc/ssh/sshd_config allows these ciphers: $ciphers"; fi | |
fi | |
if [[ -z "$ciphers" ]]; then | |
ciphers=$(echo $(ssh -Q cipher)) | |
if [[ -n "$ciphers" ]]; then echo "ssh -Q cipher reports these ciphers: $ciphers"; fi | |
fi | |
if [[ -z "$ciphers" ]]; then | |
read -rd '' ciphers <<EOF | |
3des-cbc aes128-cbc aes128-ctr aes128-gcm@openssh.com aes192-cbc aes192-ctr | |
aes256-cbc aes256-ctr aes256-gcm@openssh.com arcfour arcfour128 arcfour256 | |
blowfish-cbc cast128-cbc chacha20-poly1305@openssh.com rijndael-cbc@lysator.liu.se | |
EOF | |
echo "Default cipher test list: $ciphers" | |
fi | |
echo | |
echo "For each cipher, will transfer 1000 MB of zeros to/from localhost." | |
echo | |
tmp=$(mktemp) | |
for i in $ciphers | |
do | |
echo -n "$i: " | |
dd if=/dev/zero bs=1000000 count=1000 2> /dev/null | | |
ssh -c $i -o Compression=no localhost "(time -p cat) > /dev/null" > $tmp 2>&1 | |
if [[ $? == 0 ]]; then | |
grep real $tmp | awk '{print 1000 / $2" MB/s" }' | |
else | |
echo "failed, for why run: ssh -vc $i localhost" | |
fi | |
done |
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