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Check speed of ssh cipher(s) on your system
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#!/bin/bash | |
# ssh-cipher-benchmark.sh - Assesses speed of SSH encryption between specific hosts. | |
# Usage: | |
# ssh-cipher-benchmark.sh <remotehost> [ciphers] | |
# Default ciphers: all we can find... | |
# | |
# Note: In some cases, the first cipher tested runs faster than the others, regardless of order. | |
# Cause of this is not known, but changing the order of testing shows it to be true. Run the | |
# first one twice if you suspect this. Perhaps it is due to buffering? | |
# | |
# Hosted at: | |
# https://gist.github.com/dlenski/e42a08fa27e97b0dbb0c0024c99a8bc4#file-ssh-cipher-benchmark-sh | |
# Which was based on: | |
# 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. | |
# parse command line | |
remote=${1:-localhost} # machine to test | |
shift | |
set -o pipefail | |
ciphers="$@" | |
if [[ -n "$ciphers" ]]; then echo "User-supplied ciphers: $ciphers"; fi | |
if [[ -z "$ciphers" ]]; then | |
ciphers=$(egrep '^\s*Ciphers' /etc/ssh/sshd_config|sed 's/Ciphers//; s/,/ /g') | |
if [[ -n "$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 ${remote}." | |
echo | |
tmp=$(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 ${remote} "(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 ${remote}" | |
fi | |
done |
Thanks, this is really helpful.
time -p
does not work if the remote shell is zsh
. To work around this, you can use /usr/bin/time -p
instead, as long as the time
program is installed in the remote machine.
Thank you for this script. Was exactly what I was looking for trying to test AES-NI.
Quick and dirty automated with sshpass. Also removed the -n
from echo -n "$i: "
for more readability.
The script tests the upload speed. To test the download speed I've changed lines 56-57 to this:
ssh -c $i -o Compression=no ${remote} "dd if=/dev/zero bs=1000000 count=1000 2> /dev/null" |
(time -p cat) > /dev/null 2> $tmp
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Thank you. Worked a treat. As I was testing over the internet I did need to alter dd to output 100MB file.