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#ifndef DISFLUID_DISFLUID_CACHE_ENTRY_HASH_INCLUDED
# define DISFLUID_DISFLUID_CACHE_ENTRY_HASH_INCLUDED
MAYBE_UNUSED static int
hash_primary_cache_key (const char *restrict method,
const char *restrict uri,
const char *restrict password,
size_t password_length,
size_t max_hash, char *restrict hash);
# include <gnutls/gnutls.h>
# include <gnutls/crypto.h>
# include <assert.h>
# include "disfluid-init.h"
static int
hash_primary_cache_key (const char *restrict method,
const char *restrict uri,
const char *restrict password,
size_t password_length,
size_t max_hash, char *restrict hash)
{
ensure_init ();
gnutls_hmac_hd_t context;
gnutls_mac_algorithm_t algo = GNUTLS_MAC_SHA256;
int error = gnutls_hmac_init (&context, algo, password, password_length);
if (error != 0)
{
return -1;
}
uint8_t digest[32];
if (gnutls_hmac_get_len (algo) != sizeof (digest))
{
/* Unreachable. */
assert (0);
}
error = gnutls_hmac (context, method, strlen (method));
if (error == 0)
{
error = gnutls_hmac (context, " ", strlen (" "));
}
if (error == 0)
{
error = gnutls_hmac (context, uri, strlen (uri));
}
gnutls_hmac_deinit (context, digest);
if (error != 0)
{
return -1;
}
gnutls_datum_t data = {
.data = digest,
.size = sizeof (digest)
};
if (gnutls_hex_encode (&data, hash, &max_hash) != 0)
{
return -2;
}
return 0;
}
#endif /* DISFLUID_DISFLUID_CACHE_ENTRY_HASH_INCLUDED */
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