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Utility function ssh_key_clone().

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This makes a second independent copy of an existing ssh_key, for
situations where one piece of code is going to want to keep it after
its current owner frees it.

In order to have it work on an arbitrary ssh_key, whether public-only
or a full public+private key pair, I've had to add an ssh_key query
method to ask whether a private key is known. I'm surprised I haven't
found a need for that before! But I suppose in most situations in an
SSH client you statically know which kind of key you're dealing with.
This commit is contained in:
Simon Tatham
2022-04-20 13:51:28 +01:00
parent 180d1b78de
commit c2f1a563a5
6 changed files with 70 additions and 0 deletions
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6
ssh.h
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@ -841,6 +841,7 @@ struct ssh_keyalg {
void (*public_blob)(ssh_key *key, BinarySink *);
void (*private_blob)(ssh_key *key, BinarySink *);
void (*openssh_blob) (ssh_key *key, BinarySink *);
bool (*has_private) (ssh_key *key);
char *(*cache_str) (ssh_key *key);
key_components *(*components) (ssh_key *key);
@ -878,6 +879,8 @@ static inline void ssh_key_private_blob(ssh_key *key, BinarySink *bs)
{ key->vt->private_blob(key, bs); }
static inline void ssh_key_openssh_blob(ssh_key *key, BinarySink *bs)
{ key->vt->openssh_blob(key, bs); }
static inline bool ssh_key_has_private(ssh_key *key)
{ return key->vt->has_private(key); }
static inline char *ssh_key_cache_str(ssh_key *key)
{ return key->vt->cache_str(key); }
static inline key_components *ssh_key_components(ssh_key *key)
@ -902,6 +905,9 @@ static inline const char *ssh_keyalg_alternate_ssh_id(
unsigned nullkey_supported_flags(const ssh_keyalg *self);
const char *nullkey_alternate_ssh_id(const ssh_keyalg *self, unsigned flags);
/* Utility functions implemented centrally */
ssh_key *ssh_key_clone(ssh_key *key);
/*
* SSH2 ECDH key exchange vtable
*/