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fsl_shw_rand.c

/*
 * Copyright 2005-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */


/*!
 * @file fsl_shw_rand.c
 *
 * This file implements Random Number Generation functions of the FSL SHW API
 * in USER MODE for talking to a standalone RNGA/RNGC device driver.
 *
 * It contains the fsl_shw_get_random() and fsl_shw_add_entropy() functions.
 *
 * These routines will build a request block and pass it to the SHW driver.
 */

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <signal.h>

#ifdef FSL_DEBUG
#include <stdio.h>
#include <errno.h>
#include <string.h>
#endif                        /* FSL_DEBUG */

#include "shw_driver.h"

extern fsl_shw_return_t validate_uco(fsl_shw_uco_t * uco);

#if defined(FSL_HAVE_RNGA) || defined(FSL_HAVE_RNGB) || defined(FSL_HAVE_RNGC)

/* REQ-S2LRD-PINTFC-API-BASIC-RNG-002 */
fsl_shw_return_t fsl_shw_get_random(fsl_shw_uco_t * user_ctx,
                            uint32_t length, uint8_t * data)
{
      fsl_shw_return_t ret = FSL_RETURN_ERROR_S;

      /* perform a sanity check / update uco */
      ret = validate_uco(user_ctx);
      if (ret == FSL_RETURN_OK_S) {
            struct get_random_req *req = malloc(sizeof(*req));

            if (req == NULL) {
                  ret = FSL_RETURN_NO_RESOURCE_S;
            } else {

                  init_req(&req->hdr, user_ctx);
                  req->size = length;
                  req->random = data;

                  ret =
                      send_req(SHW_USER_REQ_GET_RANDOM, &req->hdr,
                             user_ctx);
            }
      }

      return ret;
}

fsl_shw_return_t fsl_shw_add_entropy(fsl_shw_uco_t * user_ctx,
                             uint32_t length, uint8_t * data)
{
      fsl_shw_return_t ret = FSL_RETURN_ERROR_S;

      /* perform a sanity check on the uco */
      ret = validate_uco(user_ctx);
      if (ret == FSL_RETURN_OK_S) {
            struct add_entropy_req *req = malloc(sizeof(*req));

            if (req == NULL) {
                  ret = FSL_RETURN_NO_RESOURCE_S;
            } else {
                  init_req(&req->hdr, user_ctx);
                  req->size = length;
                  req->entropy = data;

                  ret =
                      send_req(SHW_USER_REQ_ADD_ENTROPY, &req->hdr,
                             user_ctx);
            }
      }

      return ret;
}

#else                   /* no H/W RNG block */

00101 fsl_shw_return_t fsl_shw_get_random(fsl_shw_uco_t * user_ctx,
                            uint32_t length, uint8_t * data)
{

      (void)user_ctx;
      (void)length;
      (void)data;

      return FSL_RETURN_ERROR_S;
}

00112 fsl_shw_return_t fsl_shw_add_entropy(fsl_shw_uco_t * user_ctx,
                             uint32_t length, uint8_t * data)
{

      (void)user_ctx;
      (void)length;
      (void)data;

      return FSL_RETURN_ERROR_S;
}
#endif

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