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  1. /**
  2.  * \file havege.h
  3.  *
  4.  * \brief HAVEGE: HArdware Volatile Entropy Gathering and Expansion
  5.  */
  6. /*
  7.  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
  8.  *  SPDX-License-Identifier: GPL-2.0
  9.  *
  10.  *  This program is free software; you can redistribute it and/or modify
  11.  *  it under the terms of the GNU General Public License as published by
  12.  *  the Free Software Foundation; either version 2 of the License, or
  13.  *  (at your option) any later version.
  14.  *
  15.  *  This program is distributed in the hope that it will be useful,
  16.  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17.  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18.  *  GNU General Public License for more details.
  19.  *
  20.  *  You should have received a copy of the GNU General Public License along
  21.  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22.  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23.  *
  24.  *  This file is part of mbed TLS (https://tls.mbed.org)
  25.  */
  26. #ifndef MBEDTLS_HAVEGE_H
  27. #define MBEDTLS_HAVEGE_H
  28.  
  29. #if !defined(MBEDTLS_CONFIG_FILE)
  30. #include "config.h"
  31. #else
  32. #include MBEDTLS_CONFIG_FILE
  33. #endif
  34.  
  35. #include <stddef.h>
  36.  
  37. #define MBEDTLS_HAVEGE_COLLECT_SIZE 1024
  38.  
  39. #ifdef __cplusplus
  40. extern "C" {
  41. #endif
  42.  
  43. /**
  44.  * \brief          HAVEGE state structure
  45.  */
  46. typedef struct mbedtls_havege_state
  47. {
  48.     int PT1, PT2, offset[2];
  49.     int pool[MBEDTLS_HAVEGE_COLLECT_SIZE];
  50.     int WALK[8192];
  51. }
  52. mbedtls_havege_state;
  53.  
  54. /**
  55.  * \brief          HAVEGE initialization
  56.  *
  57.  * \param hs       HAVEGE state to be initialized
  58.  */
  59. void mbedtls_havege_init( mbedtls_havege_state *hs );
  60.  
  61. /**
  62.  * \brief          Clear HAVEGE state
  63.  *
  64.  * \param hs       HAVEGE state to be cleared
  65.  */
  66. void mbedtls_havege_free( mbedtls_havege_state *hs );
  67.  
  68. /**
  69.  * \brief          HAVEGE rand function
  70.  *
  71.  * \param p_rng    A HAVEGE state
  72.  * \param output   Buffer to fill
  73.  * \param len      Length of buffer
  74.  *
  75.  * \return         0
  76.  */
  77. int mbedtls_havege_random( void *p_rng, unsigned char *output, size_t len );
  78.  
  79. #ifdef __cplusplus
  80. }
  81. #endif
  82.  
  83. #endif /* havege.h */
  84.