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Add have_ssh_host_key() and use it to influence algorithm selection.

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The general plan is that if PuTTY knows a host key for a server, it
should preferentially ask for the same type of key so that there's some
chance of actually getting the same key again.  This should mean that
when a server (or PuTTY) adds a new host key type, PuTTY doesn't
gratuitously switch to that key type and then warn the user about an
unrecognised key.
This commit is contained in:
Ben Harris
2015-05-29 22:40:50 +01:00
parent e222db14ff
commit d21041f7f8
4 changed files with 37 additions and 1 deletions
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5
putty.h
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@ -1197,6 +1197,11 @@ void pgp_fingerprints(void);
int verify_ssh_host_key(void *frontend, char *host, int port,
const char *keytype, char *keystr, char *fingerprint,
void (*callback)(void *ctx, int result), void *ctx);
/*
* have_ssh_host_key() just returns true if a key of that type is
* already chached and false otherwise.
*/
int have_ssh_host_key(const char *host, int port, const char *keytype);
/*
* askalg has the same set of return values as verify_ssh_host_key.
*/