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Implement Diffie-Hellman computations in crypto backends. (#149)

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Not all backends feature the low level API needed to compute a Diffie-Hellman
secret, but some of them directly implement Diffie-Hellman support with opaque
private data. The later approach is now generalized and backends are
responsible for all Diffie Hellman computations.
As a side effect, procedures/macros _libssh2_bn_rand and _libssh2_bn_mod_exp
are no longer needed outside the backends.
This commit is contained in:
monnerat
2016-11-27 19:39:00 +01:00
committed by Alexander Lamaison
parent 5abceec571
commit f7daf3185a
10 changed files with 215 additions and 96 deletions
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38
src/kex.c
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@@ -98,44 +98,6 @@
} \
}
/*
* Generic Diffie-Hellman computation support.
*
* DH context should be a _libssh2_bn *.
*/
#ifndef libssh2_dh_key_pair
static void libssh2_dh_init(_libssh2_dh_ctx *dhctx)
{
*dhctx = _libssh2_bn_init(); /* Random from client */
}
static int libssh2_dh_key_pair(_libssh2_dh_ctx *dhctx, _libssh2_bn *public,
_libssh2_bn *g, _libssh2_bn *p, int group_order,
_libssh2_bn_ctx *bnctx)
{
/* Generate x and e */
_libssh2_bn_rand(*dhctx, group_order * 8 - 1, 0, -1);
_libssh2_bn_mod_exp(public, g, *dhctx, p, bnctx);
return 0;
}
static int libssh2_dh_secret(_libssh2_dh_ctx *dhctx, _libssh2_bn *secret,
_libssh2_bn *f, _libssh2_bn *p,
_libssh2_bn_ctx * bnctx)
{
/* Compute the shared secret */
_libssh2_bn_mod_exp(secret, f, *dhctx, p, bnctx);
return 0;
}
static void libssh2_dh_dtor(_libssh2_dh_ctx *dhctx)
{
_libssh2_bn_free(*dhctx);
*dhctx = NULL;
}
#endif
/*
* diffie_hellman_sha1