bool hash_store_verify_hash(struct hash_store* self, const uint8_t* payload, size_t payloadsz, const uint8_t* expect_hash) {
uint8_t actual_hash[SEGMENT_HASHSZ];
struct ndn_digest* digest = ndn_digest_create(NDN_DIGEST_SHA256);
ndn_digest_init(digest);
ndn_digest_update(digest, payload, payloadsz);
ndn_digest_final(digest, actual_hash, sizeof(actual_hash));
ndn_digest_destroy(&digest);
return 0 == memcmp(expect_hash, actual_hash, sizeof(actual_hash));
}
bool hash_store_insert(struct hash_store* self, ndnr_accession accession, struct ndn_charbuf* co, struct ndn_parsed_ContentObject* pco) {
int res;
// retrieve payload
struct ndn_parsed_ContentObject pco2 = {0};
if (pco == NULL) {
res = ndn_parse_ContentObject(co->buf, co->length, pco = &pco2, NULL);
if (res != 0) return false;
}
const uint8_t* payload; size_t payloadsz;
ndn_content_get_value(co->buf, co->length, pco, &payload, &payloadsz);
// calculate hash
uint8_t hash[SEGMENT_HASHSZ];
struct ndn_digest* digest = ndn_digest_create(NDN_DIGEST_SHA256);
ndn_digest_init(digest);
ndn_digest_update(digest, payload, payloadsz);
ndn_digest_final(digest, hash, sizeof(hash));
ndn_digest_destroy(&digest);
LOG("hash_store_insert(%" PRIx64 ") ", (uint64_t)ndnr_accession_encode(self->h, accession));
LOG_hash(hash, SEGMENT_HASHSZ);
// find where to insert
struct ndn_btree_node* leaf = NULL;
res = ndn_btree_lookup(self->btree, hash, sizeof(hash), &leaf);
int i = NDN_BT_SRCH_INDEX(res);
if (NDN_BT_SRCH_FOUND(res)) {
LOG(" duplicate(%u,%d)\n", leaf->nodeid, i);
return true;// already have it
}
LOG(" insert(%u,%d)\n", leaf->nodeid, i);
// prepare payload
uint64_t accession_encoded = ndnr_accession_encode(self->h, accession);
// insert index entry
res = ndn_btree_prepare_for_update(self->btree, leaf);
if (res < 0) return false;
res = ndn_btree_insert_entry(leaf, i, hash, sizeof(hash), &accession_encoded, sizeof(accession_encoded));
if (res < 0) return false;
// btree maintenance
if (ndn_btree_oversize(self->btree, leaf)) {
res = ndn_btree_split(self->btree, leaf);
for (int limit = 100; res >= 0 && self->btree->nextsplit != 0; --limit) {
if (limit == 0) abort();
struct ndn_btree_node* node = ndn_btree_getnode(self->btree, self->btree->nextsplit, 0);
if (node == NULL) break;
res = ndn_btree_split(self->btree, node);
}
}
hash_store_clean(self);
return true;
}
static int
create_key_digest(const unsigned char *dkey, size_t dkey_size,
unsigned char **o_key_digest, size_t *o_key_digest_size)
{
struct ndn_digest *digest;
unsigned char *key_digest = NULL;
size_t key_digest_size;
int r;
assert(o_key_digest);
assert(o_key_digest_size);
digest = ndn_digest_create(NDN_DIGEST_SHA256);
JUMP_IF_NULL(digest, error);
ndn_digest_init(digest);
key_digest_size = ndn_digest_size(digest);
key_digest = malloc(key_digest_size);
JUMP_IF_NULL(key_digest, error);
r = ndn_digest_update(digest, dkey, dkey_size);
JUMP_IF_NEG(r, error);
r = ndn_digest_final(digest, key_digest, key_digest_size);
JUMP_IF_NEG(r, error);
ndn_digest_destroy(&digest);
*o_key_digest = key_digest;
*o_key_digest_size = key_digest_size;
return 0;
error:
PyErr_SetString(g_PyExc_NDNKeyError, "unable to generate key digest");
if (key_digest)
free(key_digest);
ndn_digest_destroy(&digest);
return -1;
}