Implement more ciphers in OpenSSH

[Leo1003]

This PR adds implementation for the ciphers supported in OpenSSH.

Closes: #108

[williamdes]

Here is my public key using a Yubikey, is it implemented ?

sk-ecdsa-sha2-nistp256@openssh.com AAAAInNrLWVjZHNhLXNoYTItbmlzdHAyNTZAb3BlbnNzaC5jb20AAAAIbmlzdHAyNTYAAABBBHsGFeKSVIeBuAXGVxAyBqq5x55neL8R8XfQUrEGsUwNvf5xKyFwtM8hMY60TXqf/DtMMrGJl0eiAen4Lgs+BMwAAAAfc3NoOndpbGxpYW1kZXMreWJtLTIwMjNAd2Rlcy5mcg== williamdes+ybm-2023@wdes.fr

[tarcieri]

@williamdes this PR is adding symmetric ciphers for key encryption, not digital signature algorithms.

That said that key is using ECDSA/NIST P-256, which is supported by the latest release: https://docs.rs/ssh-key/latest/ssh_key/#supported-algorithms

[williamdes]

@williamdes this PR is adding symmetric ciphers for key encryption, not digital signature algorithms.

That said that key is using ECDSA/NIST P-256, which is supported by the latest release: https://docs.rs/ssh-key/latest/ssh_key/#supported-algorithms

Thanks for your kind reply
if I can be of some use to test stuff let me know

[Leo1003]

I think this PR is ready for review.

This PR introduces three new features to control which cipher is supported:

• des
• chacha20poly1305
• aes-cbc

[tarcieri]

Looks good, thanks!