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/****************************************************************************
* crypto/cryptodev.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Max Nekludov <macscomp@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdbool.h>
#include <string.h>
#include <poll.h>
#include <errno.h>
#include <nuttx/fs/fs.h>
#include <nuttx/crypto/crypto.h>
#include <nuttx/crypto/cryptodev.h>
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Character driver methods */
static ssize_t cryptodev_read(FAR struct file *filep, FAR char *buffer,
size_t len);
static ssize_t cryptodev_write(FAR struct file *filep, FAR const char *buffer,
size_t len);
static int cryptodev_ioctl(FAR struct file *filep, int cmd,
unsigned long arg);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_cryptodevops =
{
0, /* open */
0, /* close */
cryptodev_read, /* read */
cryptodev_write, /* write */
0, /* seek */
cryptodev_ioctl, /* ioctl */
0, /* poll */
};
/****************************************************************************
* Private Functions
****************************************************************************/
static ssize_t cryptodev_read(FAR struct file *filep, FAR char *buffer,
size_t len)
{
return -EACCES;
}
static ssize_t cryptodev_write(FAR struct file *filep, FAR const char *buffer,
size_t len)
{
return -EACCES;
}
static int cryptodev_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
switch(cmd)
{
case CIOCGSESSION:
{
struct session_op *ses = (struct session_op*)arg;
ses->ses = (uint32_t)ses;
return OK;
}
case CIOCFSESSION:
{
return OK;
}
case CIOCCRYPT:
{
FAR struct crypt_op *op = (struct crypt_op*)arg;
FAR struct session_op *ses = (struct session_op*)op->ses;
int encrypt;
switch (op->op)
{
case COP_ENCRYPT:
encrypt = 1;
break;
case COP_DECRYPT:
encrypt = 0;
break;
default:
return -EINVAL;
}
switch (ses->cipher)
{
#if defined(CONFIG_CRYPTO_AES)
# define AES_CYPHER(mode) aes_cypher(op->dst, op->src, op->len, op->iv, ses->key, ses->keylen, mode, encrypt)
case CRYPTO_AES_ECB:
return AES_CYPHER(AES_MODE_ECB);
case CRYPTO_AES_CBC:
return AES_CYPHER(AES_MODE_CBC);
case CRYPTO_AES_CTR:
return AES_CYPHER(AES_MODE_CTR);
# undef AES_CYPHER
#endif
default:
return -EINVAL;
}
}
default:
return -EINVAL;
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
void devcrypto_register(void)
{
(void)register_driver("/dev/crypto", &g_cryptodevops, 0666, NULL);
}
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