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Refactor ecdh_kex into an organised vtable.

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This is already slightly nice because it lets me separate the
Weierstrass and Montgomery code more completely, without having to
have a vtable tucked into dh->extra. But more to the point, it will
allow completely different kex methods to fit into the same framework
later.

To that end, I've moved more of the descriptive message generation
into the vtable, and also provided the constructor with a flag that
will let it do different things in client and server.

Also, following on from a previous commit, I've arranged that the new
API returns arbitrary binary data for the exchange hash, rather than
an mp_int. An upcoming implementation of this interface will want to
return an encoded string instead of an encoded mp_int.
This commit is contained in:
Simon Tatham
2022-04-14 07:04:33 +01:00
parent 422a89e208
commit e59ee96554
9 changed files with 207 additions and 168 deletions
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14
test/testcrypt.c
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@ -87,7 +87,7 @@ uint64_t prng_reseed_time_ms(void)
X(cipher, ssh_cipher *, ssh_cipher_free(v)) \
X(mac, ssh2_mac *, ssh2_mac_free(v)) \
X(dh, dh_ctx *, dh_cleanup(v)) \
X(ecdh, ecdh_key *, ssh_ecdhkex_freekey(v)) \
X(ecdh, ecdh_key *, ecdh_key_free(v)) \
X(rsakex, RSAKey *, ssh_rsakex_freekey(v)) \
X(rsa, RSAKey *, rsa_free(v)) \
X(prng, prng *, prng_free(v)) \
@ -787,6 +787,18 @@ static RSAKey *rsa_new(void)
return rsa;
}
strbuf *ecdh_key_getkey_wrapper(ecdh_key *ek, ptrlen remoteKey)
{
/* Fold the boolean return value in C into the string return value
* for this purpose, by returning NULL on failure */
strbuf *sb = strbuf_new();
if (!ecdh_key_getkey(ek, remoteKey, BinarySink_UPCAST(sb))) {
strbuf_free(sb);
return NULL;
}
return sb;
}
strbuf *rsa_ssh1_encrypt_wrapper(ptrlen input, RSAKey *key)
{
/* Fold the boolean return value in C into the string return value