int
tc_api_cipher_iterate(tc_api_cipher_iterator_fn fn, void *priv)
{
int i;
struct tc_cipher_chain *chain;
int klen;
int length;
char buf[1024];
if (fn == NULL) {
errno = EFAULT;
return TC_ERR;
}
for (i = 0, chain = tc_cipher_chains[0]; chain != NULL;
chain = tc_cipher_chains[++i]) {
tc_cipher_chain_sprint(buf, sizeof(buf), chain);
klen = tc_cipher_chain_klen(chain);
length = tc_cipher_chain_length(chain);
if ((fn(priv, buf, klen, length)) < 0)
break;
}
return TC_OK;
}
int
tc_cipher_chain_populate_keys(struct tc_cipher_chain *cipher_chain,
unsigned char *key)
{
int total_key_bytes, used_key_bytes;
struct tc_cipher_chain *dummy_chain;
/*
* We need to determine the total key bytes as the key locations
* depend on it.
*/
total_key_bytes = tc_cipher_chain_klen(cipher_chain);
/*
* Now we need to get prepare the keys, as the keys are in
* forward order with respect to the cipher cascade, but
* the actual decryption is in reverse cipher cascade order.
*/
used_key_bytes = 0;
for (dummy_chain = cipher_chain;
dummy_chain != NULL;
dummy_chain = dummy_chain->next) {
dummy_chain->key = alloc_safe_mem(dummy_chain->cipher->klen);
if (dummy_chain->key == NULL) {
tc_log(1, "tc_decrypt: Could not allocate key "
"memory\n");
return ENOMEM;
}
/* XXX: here we assume XTS operation! */
memcpy(dummy_chain->key,
key + used_key_bytes/2,
dummy_chain->cipher->klen/2);
memcpy(dummy_chain->key + dummy_chain->cipher->klen/2,
key + (total_key_bytes/2) + used_key_bytes/2,
dummy_chain->cipher->klen/2);
/* Remember how many key bytes we've seen */
used_key_bytes += dummy_chain->cipher->klen;
}
return 0;
}
void
print_info(struct tcplay_info *info)
{
printf("Device:\t\t\t%s\n", info->dev);
if (info->pbkdf_prf != NULL) {
printf("PBKDF2 PRF:\t\t%s\n", info->pbkdf_prf->name);
printf("PBKDF2 iterations:\t%d\n",
info->pbkdf_prf->iteration_count);
}
printf("Cipher:\t\t\t%s\n",
tc_cipher_chain_sprint(NULL, 0, info->cipher_chain));
printf("Key Length:\t\t%d bits\n",
8*tc_cipher_chain_klen(info->cipher_chain));
if (info->hdr != NULL) {
printf("CRC Key Data:\t\t%#x\n", info->hdr->crc_keys);
printf("Sector size:\t\t%d\n", info->hdr->sec_sz);
} else {
printf("Sector size:\t\t512\n");
}
printf("Volume size:\t\t%"DISKSZ_FMT" sectors\n", info->size);
#if 0
/* Don't print this; it's always 0 and is rather confusing */
printf("Volume offset:\t\t%"PRIu64"\n", (uint64_t)info->start);
#endif
#ifdef DEBUG
printf("Vol Flags:\t\t%d\n", info->volflags);
#endif
printf("IV offset:\t\t%"PRIu64" sectors\n",
(uint64_t)info->skip);
printf("Block offset:\t\t%"PRIu64" sectors\n",
(uint64_t)info->offset);
}
