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Developer(s)John Safranek
Initial releaseJuly 20, 2016 (2016-07-20)[1]
Written inC language
Operating systemMulti-platform
TypeSecurity library
LicenseGNU General Public License or Commercial Distribution 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, Android, Nintendo Wii and Gamecube through DevKitPro support, QNX, MontaVista, Tron variants, NonStop OS, OpenCL, Micrium's MicroC/OS-II, FreeRTOS, SafeRTOS, Freescale MQX, Nucleus, TinyOS, TI-RTOS, HP-UX, uTasker, and embOS.


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


wolfSSH uses the cryptographic services provided by wolfCrypt.[2] 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, licensed under the GNU General Public License GPLv3.[3]

See also[edit]


  1. ^ "wolfSSH ChangeLog".
  2. ^ wolfCrypt Usage Reference
  3. ^ GNU License

External links[edit]