int xattrs_compare(const char *filename1, const char *filename2)
{
char *new_xattrs;
char *old_xattrs;
size_t new_xattrs_len;
size_t old_xattrs_len;
int ret = 0;
xattrs_get_blob(filename1, &old_xattrs, &old_xattrs_len);
xattrs_get_blob(filename2, &new_xattrs, &new_xattrs_len);
if ((old_xattrs_len == 0) && (new_xattrs_len == 0)) {
return ret;
}
if (old_xattrs_len != new_xattrs_len) {
ret = -1;
goto out;
}
if (memcmp(old_xattrs, new_xattrs, old_xattrs_len) != 0) {
ret = -1;
}
out:
if (old_xattrs_len != 0) {
free(old_xattrs);
}
if (new_xattrs_len != 0) {
free(new_xattrs);
}
return ret;
}
static void hmac_compute_key(const char *filename,
const struct update_stat *updt_stat,
char *key, size_t *key_len, bool use_xattrs)
{
char *xattrs_blob = (void *)0xdeadcafe;
size_t xattrs_blob_len = 0;
if (use_xattrs) {
xattrs_get_blob(filename, &xattrs_blob, &xattrs_blob_len);
}
hmac_sha256_for_data(key, (const unsigned char *)updt_stat,
sizeof(struct update_stat),
(const unsigned char *)xattrs_blob,
xattrs_blob_len);
if (hash_is_zeros(key)) {
*key_len = 0;
} else {
*key_len = SWUPD_HASH_LEN - 1;
}
if (xattrs_blob_len != 0) {
free(xattrs_blob);
}
}
static void hmac_compute_key(const char *file,
const struct update_stat *updt_stat,
char **key, size_t *key_len, bool use_xattrs)
{
char *xattrs_blob = (void *)0xdeadcafe;
size_t xattrs_blob_len = 0;
if (use_xattrs)
xattrs_get_blob(file, &xattrs_blob, &xattrs_blob_len);
*key = hmac_sha256_for_data((const unsigned char *)updt_stat,
sizeof(struct update_stat),
(const unsigned char *)xattrs_blob,
xattrs_blob_len);
if (*key == NULL)
*key_len = 0;
else
*key_len = strlen((const char*)*key);
if (xattrs_blob_len != 0)
free(xattrs_blob);
}