add support for rsa-sha2 signatures #149
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Existing ssh-rsa keys can be used with sha2-256 or sha2-512 signatures instead of traditional sha1: RFC-8332 Add support for extention negotiation to discover support for the new rsa signature types: MSG_EXT_INFO / server-sig-algs: RFC-8308 Ported from upstream Paramiko to Paramiko-NG and trimmed: Co-Authored-By: Pierce Lopez <pierce.lopez@gmail.com>
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Add support for rsa-sha2-256 and rsa-sha2-512, as well as the ext-info / server-sig-algs in handshake, used to advertise support for these new signature types.
I don't want to just copy exactly how it was handled in upstream paramiko, because if it doesn't get the ext-info message it assumes the new signature types for rsa keys are supported, rather than the inverse.
I've stalled out some months ago, because I've run into some buggyness ... and this is actually pretty tricky and messy to implement in this codebase, and my motivation ran out 🤷
References I'm working from: