int
ccns_slice_name(struct ccn_charbuf *nm, struct ccns_slice *s)
{
struct ccn_charbuf *c;
struct ccn_digest *digest = NULL;
struct ccn_charbuf *hash = NULL;
int res = 0;
c = ccn_charbuf_create();
if (c == NULL)
return (-1);
res = append_slice(c, s);
if (res < 0)
goto Cleanup;
digest = ccn_digest_create(CCN_DIGEST_SHA256);
hash = ccn_charbuf_create_n(ccn_digest_size(digest));
if (hash == NULL)
goto Cleanup;
ccn_digest_init(digest);
res |= ccn_digest_update(digest, c->buf, c->length);
res |= ccn_digest_final(digest, hash->buf, hash->limit);
if (res < 0)
goto Cleanup;
hash->length = hash->limit;
if (ccn_name_from_uri(nm, "ccnx:/%C1.M.S.localhost/%C1.S.cs") < 0)
res = -1;
res |= ccn_name_append(nm, hash->buf, hash->length);
Cleanup:
ccn_charbuf_destroy(&c);
ccn_digest_destroy(&digest);
ccn_charbuf_destroy(&hash);
return (res);
}
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 ccn_digest *digest;
unsigned char *key_digest = NULL;
size_t key_digest_size;
int r;
assert(o_key_digest);
assert(o_key_digest_size);
digest = ccn_digest_create(CCN_DIGEST_SHA256);
JUMP_IF_NULL(digest, error);
ccn_digest_init(digest);
key_digest_size = ccn_digest_size(digest);
key_digest = malloc(key_digest_size);
JUMP_IF_NULL(key_digest, error);
r = ccn_digest_update(digest, dkey, dkey_size);
JUMP_IF_NEG(r, error);
r = ccn_digest_final(digest, key_digest, key_digest_size);
JUMP_IF_NEG(r, error);
ccn_digest_destroy(&digest);
*o_key_digest = key_digest;
*o_key_digest_size = key_digest_size;
return 0;
error:
PyErr_SetString(g_PyExc_CCNKeyError, "unable to generate key digest");
if (key_digest)
free(key_digest);
ccn_digest_destroy(&digest);
return -1;
}
/**
* Compute the digest of the entire ContentObject if necessary,
* caching the result in pc->digest, pc->digest_bytes.
*/
void
ccn_digest_ContentObject(const unsigned char *content_object,
struct ccn_parsed_ContentObject *pc)
{
int res;
struct ccn_digest *d = NULL;
if (pc->magic < 20080000) abort();
if (pc->digest_bytes == sizeof(pc->digest))
return;
if (pc->digest_bytes != 0) abort();
d = ccn_digest_create(CCN_DIGEST_SHA256);
ccn_digest_init(d);
res = ccn_digest_update(d, content_object, pc->offset[CCN_PCO_E]);
if (res < 0) abort();
res = ccn_digest_final(d, pc->digest, sizeof(pc->digest));
if (res < 0) abort();
if (pc->digest_bytes != 0) abort();
pc->digest_bytes = sizeof(pc->digest);
ccn_digest_destroy(&d);
}
