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/*
* Top-level vtables to select a SHA-256 implementation.
*/
#include <assert.h>
#include <stdlib.h>
#include "putty.h"
#include "ssh.h"
#include "sha256.h"
static ssh_hash *sha256_select(const ssh_hashalg *alg)
{
static const ssh_hashalg *const real_algs[] = {
#if HAVE_SHA_NI
&ssh_sha256_ni,
#endif
#if HAVE_NEON_CRYPTO
&ssh_sha256_neon,
#endif
&ssh_sha256_sw,
NULL,
};
for (size_t i = 0; real_algs[i]; i++) {
const ssh_hashalg *alg = real_algs[i];
const struct sha256_extra *alg_extra =
(const struct sha256_extra *)alg->extra;
if (check_availability(alg_extra))
return ssh_hash_new(alg);
}
/* We should never reach the NULL at the end of the list, because
* the last non-NULL entry should be software-only SHA-256, which
* is always available. */
unreachable("sha256_select ran off the end of its list");
}
const ssh_hashalg ssh_sha256 = {
.new = sha256_select,
.hlen = 32,
.blocklen = 64,
HASHALG_NAMES_ANNOTATED("SHA-256", "dummy selector vtable"),
};
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