From Wikipedia, the free encyclopedia
Developer(s)John Safranek
Initial releaseJuly 20, 2016 (2016-07-20)[1]
Stable release
1.4.15[2] Edit this on Wikidata / 23 December 2023
Written inC language
Operating systemMulti-platform
TypeSecurity library
LicenseGPL-3.0-or-later or proprietary license

wolfSSH is a small, portable, embedded SSH library targeted for use by embedded systems developers. It is an open-source implementation of SSH written in the C language. It includes SSH client libraries and an SSH server implementation. It allows for password and public key authentication.


wolfSSH is currently available for Win32/64, Linux, macOS, Solaris, Threadx, VxWorks, FreeBSD, NetBSD, OpenBSD, embedded Linux, WinCE, Haiku, OpenWrt, iPhone (iOS), Android, Wii and GameCube through DevKitPro support, QNX, MontaVista, TRON variants (TRON/ITRON/μITRON), NonStop OS, OpenCL, Micrium's MicroC/OS-II, FreeRTOS, SafeRTOS, Freescale MQX, Nucleus, TinyOS, TI-RTOS, HP-UX, uTasker, embOS, PIC32, PikeOS, and Green Hills INTEGRITY.


The wolfSSH SSH library implements the SSHv2 protocol for both client and server. It also includes support for the Secure copy and SSH File Transfer protocols.


wolfSSH uses the cryptographic services provided by wolfCrypt.[3] wolfCrypt Provides RSA, ECC, Diffie–Hellman, AES (CBC, GCM), Random Number Generation, Large Integer support, and base 16/64 encoding/decoding.

Key exchange[edit]

  • diffie-hellman-group1-sha1
  • diffie-hellman-group14-sha1
  • diffie-hellman-group-exchange-sha256
  • ecdh-sha2-nistp256
  • ecdh-sha2-nistp384
  • ecdh-sha2-nistp521

Public key[edit]

  • ssh-rsa
  • ecdsa-sha2-nistp256
  • ecdsa-sha2-nistp384
  • ecdsa-sha2-nistp521


  • hmac-sha1
  • hmac-sha1-96
  • hmac-sha2-256


  • aes128-cbc
  • aes128-gcm (OpenSSH compatible)


wolfSSH is open source and dual licensed under both the GNU GPL-3.0-or-later[4] and commercial licensing.

See also[edit]


  1. ^ "wolfSSH ChangeLog".
  2. ^ "Release 1.4.15". 23 December 2023. Retrieved 19 January 2024.
  3. ^ wolfCrypt Usage Reference
  4. ^ "Licensing Information". Archived from the original on 2021-08-18.

External links[edit]