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asyncssh 1.12.1

AsyncSSH: Asynchronous SSHv2 client and server library

AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python 3.4+ asyncio framework.

import asyncio, asyncssh, sys

async def run_client():
    async with asyncssh.connect('localhost') as conn:
        result = await'echo "Hello!"', check=True)
        print(result.stdout, end='')

except (OSError, asyncssh.Error) as exc:
    sys.exit('SSH connection failed: ' + str(exc))

Check out the examples to get started!


  • Full support for SSHv2, SFTP, and SCP client and server functions
    • Shell, command, and subsystem channels
    • Environment variables, terminal type, and window size
    • Direct and forwarded TCP/IP channels
    • OpenSSH-compatible direct and forwarded UNIX domain socket channels
    • Local and remote TCP/IP port forwarding
    • Local and remote UNIX domain socket forwarding
    • X11 forwarding support on both the client and the server
    • SFTP protocol version 3 with OpenSSH extensions
    • SCP protocol support, including third-party remote to remote copies
  • Multiple simultaneous sessions on a single SSH connection
  • Multiple SSH connections in a single event loop
  • Byte and string based I/O with settable encoding
  • A variety of key exchange, encryption, and MAC algorithms
  • Support for gzip compression
    • Including OpenSSH variant to delay compression until after auth
  • Password, public key, and keyboard-interactive user authentication methods
  • Many types and formats of public keys and certificates
    • Including support for X.509 certificates as defined in RFC 6187
  • Support for accessing keys managed by ssh-agent on UNIX systems
    • Including agent forwarding support on both the client and the server
  • Support for accessing keys managed by PuTTY’s Pageant agent on Windows
  • OpenSSH-style known_hosts file support
  • OpenSSH-style authorized_keys file support
  • Compatibility with OpenSSH “Encrypt then MAC” option for better security
  • Time and byte-count based session key renegotiation
  • Designed to be easy to extend to support new forms of key exchange, authentication, encryption, and compression algorithms


This package is released under the following terms:

Copyright (c) 2013-2018 by Ron Frederick <>. All rights reserved.

This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution and is available at:

For more information about this license, please see the Eclipse Public License FAQ.


To use asyncssh, you need the following:

  • Python 3.4 or later
  • cryptography (PyCA) 1.1 or later


Install AsyncSSH by running:

pip install asyncssh

Optional Extras

There are some optional modules you can install to enable additional functionality:

AsyncSSH defines the following optional PyPI extra packages to make it easy to install any or all of these dependencies:


For example, to install bcrypt, gssapi, libnacl, and pyOpenSSL on UNIX, you can run:

pip install 'asyncssh[bcrypt,gssapi,libnacl,pyOpenSSL]'

To install bcrypt, libnacl, pyOpenSSL, and pypiwin32 on Windows, you can run:

pip install 'asyncssh[bcrypt,libnacl,pyOpenSSL,pypiwin32]'

Note that you will still need to manually install the libsodium library listed above for libnacl to work correctly and/or libnettle for UMAC support. Unfortunately, since libsodium and libnettle are not Python packages, they cannot be directly installed using pip.

Installing the development branch

If you would like to install the development branch of asyncssh directly from Github, you can use the following command to do this:

pip install git+

Mailing Lists

Three mailing lists are available for AsyncSSH:

File Type Py Version Uploaded on Size
asyncssh-1.12.1-py3.5.egg (md5) Python Egg 3.5 2018-03-10 557KB
asyncssh-1.12.1.tar.gz (md5) Source 2018-03-10 282KB