add mbedtls crypto support

Authored by jvijtiuk on Dec 28 2017, 11:10 AM.


add mbedtls crypto support

This patch adds support for mbedTLS as a crypto backend for libssh.
mbedTLS is an SSL/TLS library that has been designed to mainly be used
in embedded systems. It is loosely coupled and has a low memory
footprint. mbedTLS also provides a cryptography library (libmbedcrypto)
that can be used without the TLS modules.
The patch is unfortunately quite big, since several new files had to
be added.
DSA is disabled at compile time, since mbedTLS doesn't support DSA
Patch review and feedback would be appreciated, and if any issues or
suggestions appear, I'm willing to work on them.

Signed-off-by: Juraj Vijtiuk <>

Test Plan:

  • The patch has been tested with a Debug and MinSizeRel build, with

libssh unit tests, client tests and the pkd tests.

  • All the tests have been run with valgrind's memcheck, drd and helgrind


  • The examples/samplessh client works when built with the patch.

Reviewers: asn, aris

Subscribers: simonsj

Differential Revision:


asnDec 28 2017, 11:10 AM
Differential Revision
D1: add mbedtls crypto support
rLIBSSH6047dc98d104: options: Rewrite set() description to get()
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