Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 1 | /** |
| 2 | * \file hmac_drbg.h |
| 3 | * |
| 4 | * \brief HMAC_DRBG (NIST SP 800-90A) |
| 5 | * |
Manuel Pégourié-Gonnard | a658a40 | 2015-01-23 09:45:19 +0000 | [diff] [blame] | 6 | * Copyright (C) 2014, ARM Limited, All Rights Reserved |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 7 | * |
Manuel Pégourié-Gonnard | fe44643 | 2015-03-06 13:17:10 +0000 | [diff] [blame] | 8 | * This file is part of mbed TLS (https://tls.mbed.org) |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 9 | * |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 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 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 24 | #ifndef MBEDTLS_HMAC_DRBG_H |
| 25 | #define MBEDTLS_HMAC_DRBG_H |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 26 | |
| 27 | #include "md.h" |
| 28 | |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 29 | /* |
Manuel Pégourié-Gonnard | 9a6e93e | 2014-03-11 09:34:02 +0100 | [diff] [blame] | 30 | * Error codes |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 31 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 32 | #define MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG -0x0003 /**< Too many random requested in single call. */ |
| 33 | #define MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG -0x0005 /**< Input too large (Entropy + additional). */ |
| 34 | #define MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR -0x0007 /**< Read/write error in file. */ |
| 35 | #define MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED -0x0009 /**< The entropy source failed. */ |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 36 | |
Paul Bakker | 088c5c5 | 2014-04-25 11:11:10 +0200 | [diff] [blame] | 37 | /** |
| 38 | * \name SECTION: Module settings |
| 39 | * |
| 40 | * The configuration options you can set for this module are in this section. |
| 41 | * Either change them in config.h or define them on the compiler command line. |
| 42 | * \{ |
| 43 | */ |
| 44 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 45 | #if !defined(MBEDTLS_HMAC_DRBG_RESEED_INTERVAL) |
| 46 | #define MBEDTLS_HMAC_DRBG_RESEED_INTERVAL 10000 /**< Interval before reseed is performed by default */ |
Paul Bakker | 088c5c5 | 2014-04-25 11:11:10 +0200 | [diff] [blame] | 47 | #endif |
| 48 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 49 | #if !defined(MBEDTLS_HMAC_DRBG_MAX_INPUT) |
| 50 | #define MBEDTLS_HMAC_DRBG_MAX_INPUT 256 /**< Maximum number of additional input bytes */ |
Paul Bakker | 088c5c5 | 2014-04-25 11:11:10 +0200 | [diff] [blame] | 51 | #endif |
| 52 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 53 | #if !defined(MBEDTLS_HMAC_DRBG_MAX_REQUEST) |
| 54 | #define MBEDTLS_HMAC_DRBG_MAX_REQUEST 1024 /**< Maximum number of requested bytes per call */ |
Paul Bakker | 088c5c5 | 2014-04-25 11:11:10 +0200 | [diff] [blame] | 55 | #endif |
| 56 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 57 | #if !defined(MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT) |
| 58 | #define MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT 384 /**< Maximum size of (re)seed buffer */ |
Paul Bakker | 088c5c5 | 2014-04-25 11:11:10 +0200 | [diff] [blame] | 59 | #endif |
| 60 | |
| 61 | /* \} name SECTION: Module settings */ |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 62 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 63 | #define MBEDTLS_HMAC_DRBG_PR_OFF 0 /**< No prediction resistance */ |
| 64 | #define MBEDTLS_HMAC_DRBG_PR_ON 1 /**< Prediction resistance enabled */ |
Manuel Pégourié-Gonnard | af786ff | 2014-01-30 18:44:18 +0100 | [diff] [blame] | 65 | |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 66 | #ifdef __cplusplus |
| 67 | extern "C" { |
| 68 | #endif |
| 69 | |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 70 | /** |
| 71 | * HMAC_DRBG context. |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 72 | */ |
| 73 | typedef struct |
| 74 | { |
Manuel Pégourié-Gonnard | b05db2a | 2014-02-01 11:38:05 +0100 | [diff] [blame] | 75 | /* Working state: the key K is not stored explicitely, |
| 76 | * but is implied by the HMAC context */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 77 | mbedtls_md_context_t md_ctx; /*!< HMAC context (inc. K) */ |
| 78 | unsigned char V[MBEDTLS_MD_MAX_SIZE]; /*!< V in the spec */ |
Manuel Pégourié-Gonnard | b05db2a | 2014-02-01 11:38:05 +0100 | [diff] [blame] | 79 | int reseed_counter; /*!< reseed counter */ |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 80 | |
Manuel Pégourié-Gonnard | 658dbed | 2014-01-30 19:03:45 +0100 | [diff] [blame] | 81 | /* Administrative state */ |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 82 | size_t entropy_len; /*!< entropy bytes grabbed on each (re)seed */ |
Manuel Pégourié-Gonnard | af786ff | 2014-01-30 18:44:18 +0100 | [diff] [blame] | 83 | int prediction_resistance; /*!< enable prediction resistance (Automatic |
| 84 | reseed before every random generation) */ |
Manuel Pégourié-Gonnard | 658dbed | 2014-01-30 19:03:45 +0100 | [diff] [blame] | 85 | int reseed_interval; /*!< reseed interval */ |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 86 | |
Manuel Pégourié-Gonnard | 658dbed | 2014-01-30 19:03:45 +0100 | [diff] [blame] | 87 | /* Callbacks */ |
Manuel Pégourié-Gonnard | af786ff | 2014-01-30 18:44:18 +0100 | [diff] [blame] | 88 | int (*f_entropy)(void *, unsigned char *, size_t); /*!< entropy function */ |
| 89 | void *p_entropy; /*!< context for the entropy function */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 90 | } mbedtls_hmac_drbg_context; |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 91 | |
| 92 | /** |
Manuel Pégourié-Gonnard | 8d128ef | 2015-04-28 22:38:08 +0200 | [diff] [blame] | 93 | * \brief HMAC_DRBG context initialization |
Manuel Pégourié-Gonnard | f9e9481 | 2015-04-28 22:07:14 +0200 | [diff] [blame] | 94 | * Makes the context ready for mbetls_hmac_drbg_seed(), |
| 95 | * mbedtls_hmac_drbg_seed_buf() or |
| 96 | * mbedtls_hmac_drbg_free(). |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 97 | * |
Manuel Pégourié-Gonnard | f9e9481 | 2015-04-28 22:07:14 +0200 | [diff] [blame] | 98 | * \param ctx HMAC_DRBG context to be initialized |
| 99 | */ |
| 100 | void mbedtls_hmac_drbg_init( mbedtls_hmac_drbg_context *ctx ); |
| 101 | |
| 102 | /** |
| 103 | * \brief HMAC_DRBG initial seeding |
Manuel Pégourié-Gonnard | 8d128ef | 2015-04-28 22:38:08 +0200 | [diff] [blame] | 104 | * Seed and setup entropy source for future reseeds. |
Manuel Pégourié-Gonnard | f9e9481 | 2015-04-28 22:07:14 +0200 | [diff] [blame] | 105 | * |
| 106 | * \param ctx HMAC_DRBG context to be seeded |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 107 | * \param md_info MD algorithm to use for HMAC_DRBG |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 108 | * \param f_entropy Entropy callback (p_entropy, buffer to fill, buffer |
| 109 | * length) |
| 110 | * \param p_entropy Entropy context |
| 111 | * \param custom Personalization data (Device specific identifiers) |
| 112 | * (Can be NULL) |
| 113 | * \param len Length of personalization data |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 114 | * |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 115 | * \note The "security strength" as defined by NIST is set to: |
| 116 | * 128 bits if md_alg is SHA-1, |
| 117 | * 192 bits if md_alg is SHA-224, |
| 118 | * 256 bits if md_alg is SHA-256 or higher. |
| 119 | * Note that SHA-256 is just as efficient as SHA-224. |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 120 | * |
| 121 | * \return 0 if successful, or |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 122 | * MBEDTLS_ERR_MD_BAD_INPUT_DATA, or |
| 123 | * MBEDTLS_ERR_MD_ALLOC_FAILED, or |
Manuel Pégourié-Gonnard | f9e9481 | 2015-04-28 22:07:14 +0200 | [diff] [blame] | 124 | * MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED. |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 125 | */ |
Manuel Pégourié-Gonnard | f9e9481 | 2015-04-28 22:07:14 +0200 | [diff] [blame] | 126 | int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx, |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 127 | const mbedtls_md_info_t * md_info, |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 128 | int (*f_entropy)(void *, unsigned char *, size_t), |
| 129 | void *p_entropy, |
| 130 | const unsigned char *custom, |
| 131 | size_t len ); |
| 132 | |
| 133 | /** |
Manuel Pégourié-Gonnard | 4e669c6 | 2014-01-30 18:06:08 +0100 | [diff] [blame] | 134 | * \brief Initilisation of simpified HMAC_DRBG (never reseeds). |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 135 | * (For use with deterministic ECDSA.) |
| 136 | * |
| 137 | * \param ctx HMAC_DRBG context to be initialised |
| 138 | * \param md_info MD algorithm to use for HMAC_DRBG |
| 139 | * \param data Concatenation of entropy string and additional data |
| 140 | * \param data_len Length of data in bytes |
| 141 | * |
| 142 | * \return 0 if successful, or |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 143 | * MBEDTLS_ERR_MD_BAD_INPUT_DATA, or |
| 144 | * MBEDTLS_ERR_MD_ALLOC_FAILED. |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 145 | */ |
Manuel Pégourié-Gonnard | f9e9481 | 2015-04-28 22:07:14 +0200 | [diff] [blame] | 146 | int mbedtls_hmac_drbg_seed_buf( mbedtls_hmac_drbg_context *ctx, |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 147 | const mbedtls_md_info_t * md_info, |
Manuel Pégourié-Gonnard | fe34a5f | 2014-01-30 15:06:40 +0100 | [diff] [blame] | 148 | const unsigned char *data, size_t data_len ); |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 149 | |
| 150 | /** |
Manuel Pégourié-Gonnard | af786ff | 2014-01-30 18:44:18 +0100 | [diff] [blame] | 151 | * \brief Enable / disable prediction resistance (Default: Off) |
| 152 | * |
| 153 | * Note: If enabled, entropy is used for ctx->entropy_len before each call! |
| 154 | * Only use this if you have ample supply of good entropy! |
| 155 | * |
| 156 | * \param ctx HMAC_DRBG context |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 157 | * \param resistance MBEDTLS_HMAC_DRBG_PR_ON or MBEDTLS_HMAC_DRBG_PR_OFF |
Manuel Pégourié-Gonnard | af786ff | 2014-01-30 18:44:18 +0100 | [diff] [blame] | 158 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 159 | void mbedtls_hmac_drbg_set_prediction_resistance( mbedtls_hmac_drbg_context *ctx, |
Manuel Pégourié-Gonnard | af786ff | 2014-01-30 18:44:18 +0100 | [diff] [blame] | 160 | int resistance ); |
| 161 | |
| 162 | /** |
Manuel Pégourié-Gonnard | 4e669c6 | 2014-01-30 18:06:08 +0100 | [diff] [blame] | 163 | * \brief Set the amount of entropy grabbed on each reseed |
Manuel Pégourié-Gonnard | 658dbed | 2014-01-30 19:03:45 +0100 | [diff] [blame] | 164 | * (Default: given by the security strength, which |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 165 | * depends on the hash used, see \c mbedtls_hmac_drbg_init() ) |
Manuel Pégourié-Gonnard | 4e669c6 | 2014-01-30 18:06:08 +0100 | [diff] [blame] | 166 | * |
| 167 | * \param ctx HMAC_DRBG context |
Manuel Pégourié-Gonnard | 658dbed | 2014-01-30 19:03:45 +0100 | [diff] [blame] | 168 | * \param len Amount of entropy to grab, in bytes |
Manuel Pégourié-Gonnard | 4e669c6 | 2014-01-30 18:06:08 +0100 | [diff] [blame] | 169 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 170 | void mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx, |
Manuel Pégourié-Gonnard | 4e669c6 | 2014-01-30 18:06:08 +0100 | [diff] [blame] | 171 | size_t len ); |
| 172 | |
| 173 | /** |
Manuel Pégourié-Gonnard | 658dbed | 2014-01-30 19:03:45 +0100 | [diff] [blame] | 174 | * \brief Set the reseed interval |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 175 | * (Default: MBEDTLS_HMAC_DRBG_RESEED_INTERVAL) |
Manuel Pégourié-Gonnard | 658dbed | 2014-01-30 19:03:45 +0100 | [diff] [blame] | 176 | * |
| 177 | * \param ctx HMAC_DRBG context |
| 178 | * \param interval Reseed interval |
| 179 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 180 | void mbedtls_hmac_drbg_set_reseed_interval( mbedtls_hmac_drbg_context *ctx, |
Manuel Pégourié-Gonnard | 658dbed | 2014-01-30 19:03:45 +0100 | [diff] [blame] | 181 | int interval ); |
| 182 | |
| 183 | /** |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 184 | * \brief HMAC_DRBG update state |
| 185 | * |
| 186 | * \param ctx HMAC_DRBG context |
| 187 | * \param additional Additional data to update state with, or NULL |
| 188 | * \param add_len Length of additional data, or 0 |
| 189 | * |
| 190 | * \note Additional data is optional, pass NULL and 0 as second |
| 191 | * third argument if no additional data is being used. |
| 192 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 193 | void mbedtls_hmac_drbg_update( mbedtls_hmac_drbg_context *ctx, |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 194 | const unsigned char *additional, size_t add_len ); |
| 195 | |
| 196 | /** |
Manuel Pégourié-Gonnard | 8fc484d | 2014-01-30 18:28:09 +0100 | [diff] [blame] | 197 | * \brief HMAC_DRBG reseeding (extracts data from entropy source) |
| 198 | * |
| 199 | * \param ctx HMAC_DRBG context |
| 200 | * \param additional Additional data to add to state (Can be NULL) |
| 201 | * \param len Length of additional data |
| 202 | * |
| 203 | * \return 0 if successful, or |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 204 | * MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED |
Manuel Pégourié-Gonnard | 8fc484d | 2014-01-30 18:28:09 +0100 | [diff] [blame] | 205 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 206 | int mbedtls_hmac_drbg_reseed( mbedtls_hmac_drbg_context *ctx, |
Manuel Pégourié-Gonnard | 8fc484d | 2014-01-30 18:28:09 +0100 | [diff] [blame] | 207 | const unsigned char *additional, size_t len ); |
| 208 | |
| 209 | /** |
Manuel Pégourié-Gonnard | 8208d16 | 2014-01-30 12:19:26 +0100 | [diff] [blame] | 210 | * \brief HMAC_DRBG generate random with additional update input |
| 211 | * |
Manuel Pégourié-Gonnard | 658dbed | 2014-01-30 19:03:45 +0100 | [diff] [blame] | 212 | * Note: Automatically reseeds if reseed_counter is reached or PR is enabled. |
Manuel Pégourié-Gonnard | 8208d16 | 2014-01-30 12:19:26 +0100 | [diff] [blame] | 213 | * |
| 214 | * \param p_rng HMAC_DRBG context |
| 215 | * \param output Buffer to fill |
| 216 | * \param output_len Length of the buffer |
| 217 | * \param additional Additional data to update with (can be NULL) |
| 218 | * \param add_len Length of additional data (can be 0) |
| 219 | * |
| 220 | * \return 0 if successful, or |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 221 | * MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED, or |
| 222 | * MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG, or |
| 223 | * MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG. |
Manuel Pégourié-Gonnard | 8208d16 | 2014-01-30 12:19:26 +0100 | [diff] [blame] | 224 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 225 | int mbedtls_hmac_drbg_random_with_add( void *p_rng, |
Manuel Pégourié-Gonnard | 8208d16 | 2014-01-30 12:19:26 +0100 | [diff] [blame] | 226 | unsigned char *output, size_t output_len, |
| 227 | const unsigned char *additional, |
| 228 | size_t add_len ); |
| 229 | |
| 230 | /** |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 231 | * \brief HMAC_DRBG generate random |
| 232 | * |
Manuel Pégourié-Gonnard | 658dbed | 2014-01-30 19:03:45 +0100 | [diff] [blame] | 233 | * Note: Automatically reseeds if reseed_counter is reached or PR is enabled. |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 234 | * |
| 235 | * \param p_rng HMAC_DRBG context |
| 236 | * \param output Buffer to fill |
Manuel Pégourié-Gonnard | f6a17d0 | 2014-01-31 11:51:42 +0100 | [diff] [blame] | 237 | * \param out_len Length of the buffer |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 238 | * |
Manuel Pégourié-Gonnard | 8208d16 | 2014-01-30 12:19:26 +0100 | [diff] [blame] | 239 | * \return 0 if successful, or |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 240 | * MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED, or |
| 241 | * MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 242 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 243 | int mbedtls_hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len ); |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 244 | |
| 245 | /** |
| 246 | * \brief Free an HMAC_DRBG context |
| 247 | * |
| 248 | * \param ctx HMAC_DRBG context to free. |
| 249 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 250 | void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx ); |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 251 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 252 | #if defined(MBEDTLS_FS_IO) |
Manuel Pégourié-Gonnard | 48bc3e8 | 2014-01-30 21:11:16 +0100 | [diff] [blame] | 253 | /** |
| 254 | * \brief Write a seed file |
| 255 | * |
| 256 | * \param ctx HMAC_DRBG context |
| 257 | * \param path Name of the file |
| 258 | * |
| 259 | * \return 0 if successful, 1 on file error, or |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 260 | * MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED |
Manuel Pégourié-Gonnard | 48bc3e8 | 2014-01-30 21:11:16 +0100 | [diff] [blame] | 261 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 262 | int mbedtls_hmac_drbg_write_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path ); |
Manuel Pégourié-Gonnard | 48bc3e8 | 2014-01-30 21:11:16 +0100 | [diff] [blame] | 263 | |
| 264 | /** |
| 265 | * \brief Read and update a seed file. Seed is added to this |
| 266 | * instance |
| 267 | * |
| 268 | * \param ctx HMAC_DRBG context |
| 269 | * \param path Name of the file |
| 270 | * |
| 271 | * \return 0 if successful, 1 on file error, |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 272 | * MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED or |
| 273 | * MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG |
Manuel Pégourié-Gonnard | 48bc3e8 | 2014-01-30 21:11:16 +0100 | [diff] [blame] | 274 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 275 | int mbedtls_hmac_drbg_update_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path ); |
| 276 | #endif /* MBEDTLS_FS_IO */ |
Manuel Pégourié-Gonnard | 48bc3e8 | 2014-01-30 21:11:16 +0100 | [diff] [blame] | 277 | |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 278 | |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 279 | #if defined(MBEDTLS_SELF_TEST) |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 280 | /** |
| 281 | * \brief Checkup routine |
| 282 | * |
| 283 | * \return 0 if successful, or 1 if the test failed |
| 284 | */ |
Manuel Pégourié-Gonnard | 2cf5a7c | 2015-04-08 12:49:31 +0200 | [diff] [blame] | 285 | int mbedtls_hmac_drbg_self_test( int verbose ); |
Manuel Pégourié-Gonnard | 490bdf3 | 2014-01-27 14:03:10 +0100 | [diff] [blame] | 286 | #endif |
| 287 | |
| 288 | #ifdef __cplusplus |
| 289 | } |
| 290 | #endif |
| 291 | |
| 292 | #endif /* hmac_drbg.h */ |