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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/drivers/drivers.h>
- #include <nuttx/crypto/crypto.h>
- #include <nuttx/crypto/cryptodev.h>
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- #ifdef CONFIG_CRYPTO_AES
- # define AES_CYPHER(mode) \
- aes_cypher(op->dst, op->src, op->len, op->iv, ses->key, ses->keylen, \
- mode, encrypt)
- #endif
- /****************************************************************************
- * 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 */
- #ifndef CONFIG_DISABLE_POLL
- , 0 /* poll */
- #endif
- #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
- , 0 /* unlink */
- #endif
- };
- /****************************************************************************
- * 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:
- {
- FAR struct session_op *ses = (FAR struct session_op *)arg;
- ses->ses = (uint32_t)ses;
- return OK;
- }
- case CIOCFSESSION:
- {
- return OK;
- }
- #ifdef CONFIG_CRYPTO_AES
- case CIOCCRYPT:
- {
- FAR struct crypt_op *op = (FAR struct crypt_op *)arg;
- FAR struct session_op *ses = (FAR 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)
- {
- 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);
- default:
- return -EINVAL;
- }
- }
- #endif
- default:
- return -ENOTTY;
- }
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- void devcrypto_register(void)
- {
- (void)register_driver("/dev/crypto", &g_cryptodevops, 0666, NULL);
- }
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