New signature methods

[whiteley]

These were added in openssh/openssh-portable@76c9fbb and available since OpenSSH_7.2p1.

[codecov-io]

Codecov Report

Merging #509 into master will decrease coverage by 1.2%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #509      +/-   ##
==========================================
- Coverage   95.57%   94.37%   -1.21%     
==========================================
  Files         142      142              
  Lines        8733     8875     +142     
==========================================
+ Hits         8347     8376      +29     
- Misses        386      499     +113

Impacted Files	Coverage Δ
lib/net/ssh/authentication/agent.rb	93.38% <100%> (-5.01%)	⬇️
lib/net/ssh/transport/identity_cipher.rb	83.33% <0%> (-16.67%)	⬇️
lib/net/ssh/verifiers/null.rb	60% <0%> (-15%)	⬇️
lib/net/ssh/test/remote_packet.rb	80% <0%> (-12.31%)	⬇️
lib/net/ssh/verifiers/secure.rb	90.9% <0%> (-9.1%)	⬇️
...t/ssh/transport/kex/diffie_hellman_group14_sha1.rb	92.3% <0%> (-7.7%)	⬇️
lib/net/ssh/authentication/key_manager.rb	83.07% <0%> (-7.61%)	⬇️
lib/net/ssh/test/local_packet.rb	72% <0%> (-6.27%)	⬇️
lib/net/ssh/test/packet.rb	80.95% <0%> (-6.23%)	⬇️
test/authentication/methods/test_hostbased.rb	94.02% <0%> (-5.98%)	⬇️
... and 43 more

---

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[mfazekas]

Nice, thanks much for the contribution.

Can you show the usecase for this?

[whiteley]

@mfazekas my use case is a bit unusual, I want to use ssh-agent to sign API requests for Chef. It can however be used when authenticating to similarly new SSH servers instead of the original SHA1 method.

https://github.com/whiteley/mixlib-authentication/tree/ssh-agent

[whiteley]

@mfazekas any ideas on when the next gem release might be scheduled?