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/*
* New driver for /dev/crypto device (aka CryptoDev)
* Copyright (c) 2010 Nikos Mavrogiannopoulos <nmav@gnutls.org>
*
* This file is part of linux cryptodev.
*
* cryptodev is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* cryptodev is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/mm.h>
#include "cryptodev.h"
#include <asm/uaccess.h>
#include <asm/ioctl.h>
#include <linux/scatterlist.h>
#include "ncr.h"
#include "ncr_int.h"
#include "cryptodev_int.h"
struct packed_key {
uint8_t type;
uint32_t flags;
uint16_t algorithm; /* valid for public/private keys */
uint8_t key_id[MAX_KEY_ID_SIZE];
uint8_t key_id_size;
uint8_t raw[KEY_DATA_MAX_SIZE];
uint32_t raw_size;
} __attribute__((__packed__));
/**
* key_to_storage_data:
* @key: The key to pack
* @sdata: Output data
* @sdata_size: Output data size
*
* This function will pack the given key and return allocated data with the packed
* key.
*
* Returns: 0 or errno.
**/
int key_to_storage_data( uint8_t** sdata, size_t * sdata_size, const struct key_item_st *key)
{
struct packed_key * pkey;
int ret;
pkey = kmalloc(sizeof(*pkey), GFP_KERNEL);
if (pkey == NULL) {
err();
return -ENOMEM;
}
pkey->type = key->type;
pkey->flags = key->flags;
pkey->algorithm = key->algorithm;
pkey->key_id_size = key->key_id_size;
memcpy(pkey->key_id, key->key_id, key->key_id_size);
if (key->type == NCR_KEY_TYPE_SECRET) {
pkey->raw_size = key->key.secret.size;
memcpy(pkey->raw, key->key.secret.data, pkey->raw_size);
} else if (key->type == NCR_KEY_TYPE_PRIVATE || key->type == NCR_KEY_TYPE_PUBLIC) {
pkey->raw_size = sizeof(pkey->raw);
ret = ncr_pk_pack( key, pkey->raw, &pkey->raw_size);
if (ret < 0) {
err();
goto fail;
}
} else {
err();
ret = -EINVAL;
goto fail;
}
*sdata = (void*)pkey;
*sdata_size = sizeof(*pkey);
return 0;
fail:
kfree(pkey);
return ret;
}
/**
* key_from_storage_data:
* @key: The key to unpack on
* @data: input data
* @data_size: Input data size
*
* This function will unpack the given packed key and store it into the key item.
*
* Returns: 0 or errno.
**/
int key_from_storage_data(struct key_item_st* key, const void* data, size_t data_size)
{
const struct packed_key * pkey = data;
int ret;
if (data_size != sizeof(*pkey) || pkey->key_id_size > MAX_KEY_ID_SIZE) {
err();
return -EINVAL;
}
key->type = pkey->type;
key->flags = pkey->flags;
key->algorithm = pkey->algorithm;
key->key_id_size = pkey->key_id_size;
memcpy(key->key_id, pkey->key_id, pkey->key_id_size);
if (key->type == NCR_KEY_TYPE_SECRET) {
if (pkey->raw_size > NCR_CIPHER_MAX_KEY_LEN) {
err();
return -EINVAL;
}
key->key.secret.size = pkey->raw_size;
memcpy(key->key.secret.data, pkey->raw, pkey->raw_size);
} else if (key->type == NCR_KEY_TYPE_PUBLIC
|| key->type == NCR_KEY_TYPE_PRIVATE) {
ret = ncr_pk_unpack( key, pkey->raw, pkey->raw_size);
if (ret < 0) {
err();
return ret;
}
} else {
err();
return -EINVAL;
}
return 0;
}
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