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Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +01001/**
2 * \file hmac_drbg.h
3 *
Gilles Peskineeb99c102019-10-02 18:56:17 +02004 * \brief The HMAC_DRBG pseudorandom generator.
5 *
6 * This module implements the HMAC_DRBG pseudorandom generator described
7 * in <em>NIST SP 800-90A: Recommendation for Random Number Generation Using
8 * Deterministic Random Bit Generators</em>.
Darryl Greena40a1012018-01-05 15:33:17 +00009 */
10/*
Gilles Peskineeb99c102019-10-02 18:56:17 +020011 * Copyright (C) 2006-2019, ARM Limited, All Rights Reserved
Manuel Pégourié-Gonnard37ff1402015-09-04 14:21:07 +020012 * SPDX-License-Identifier: Apache-2.0
13 *
14 * Licensed under the Apache License, Version 2.0 (the "License"); you may
15 * not use this file except in compliance with the License.
16 * You may obtain a copy of the License at
17 *
18 * http://www.apache.org/licenses/LICENSE-2.0
19 *
20 * Unless required by applicable law or agreed to in writing, software
21 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
22 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
23 * See the License for the specific language governing permissions and
24 * limitations under the License.
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +010025 *
Manuel Pégourié-Gonnardfe446432015-03-06 13:17:10 +000026 * This file is part of mbed TLS (https://tls.mbed.org)
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +010027 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020028#ifndef MBEDTLS_HMAC_DRBG_H
29#define MBEDTLS_HMAC_DRBG_H
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +010030
Ron Eldor0559c662018-02-14 16:02:41 +020031#if !defined(MBEDTLS_CONFIG_FILE)
32#include "config.h"
33#else
34#include MBEDTLS_CONFIG_FILE
35#endif
36
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +010037#include "md.h"
38
Manuel Pégourié-Gonnard0a4fb092015-05-07 12:50:31 +010039#if defined(MBEDTLS_THREADING_C)
Ron Eldordf9b93e2017-05-14 16:17:33 +030040#include "threading.h"
Manuel Pégourié-Gonnard0a4fb092015-05-07 12:50:31 +010041#endif
42
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +010043/*
Manuel Pégourié-Gonnard9a6e93e2014-03-11 09:34:02 +010044 * Error codes
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +010045 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020046#define MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG -0x0003 /**< Too many random requested in single call. */
47#define MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG -0x0005 /**< Input too large (Entropy + additional). */
48#define MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR -0x0007 /**< Read/write error in file. */
49#define MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED -0x0009 /**< The entropy source failed. */
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +010050
Paul Bakker088c5c52014-04-25 11:11:10 +020051/**
52 * \name SECTION: Module settings
53 *
54 * The configuration options you can set for this module are in this section.
55 * Either change them in config.h or define them on the compiler command line.
56 * \{
57 */
58
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020059#if !defined(MBEDTLS_HMAC_DRBG_RESEED_INTERVAL)
60#define MBEDTLS_HMAC_DRBG_RESEED_INTERVAL 10000 /**< Interval before reseed is performed by default */
Paul Bakker088c5c52014-04-25 11:11:10 +020061#endif
62
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020063#if !defined(MBEDTLS_HMAC_DRBG_MAX_INPUT)
64#define MBEDTLS_HMAC_DRBG_MAX_INPUT 256 /**< Maximum number of additional input bytes */
Paul Bakker088c5c52014-04-25 11:11:10 +020065#endif
66
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020067#if !defined(MBEDTLS_HMAC_DRBG_MAX_REQUEST)
68#define MBEDTLS_HMAC_DRBG_MAX_REQUEST 1024 /**< Maximum number of requested bytes per call */
Paul Bakker088c5c52014-04-25 11:11:10 +020069#endif
70
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020071#if !defined(MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT)
72#define MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT 384 /**< Maximum size of (re)seed buffer */
Paul Bakker088c5c52014-04-25 11:11:10 +020073#endif
74
75/* \} name SECTION: Module settings */
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +010076
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020077#define MBEDTLS_HMAC_DRBG_PR_OFF 0 /**< No prediction resistance */
78#define MBEDTLS_HMAC_DRBG_PR_ON 1 /**< Prediction resistance enabled */
Manuel Pégourié-Gonnardaf786ff2014-01-30 18:44:18 +010079
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +010080#ifdef __cplusplus
81extern "C" {
82#endif
83
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +010084/**
85 * HMAC_DRBG context.
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +010086 */
87typedef struct
88{
Antonin Décimo8fd91562019-01-23 15:24:37 +010089 /* Working state: the key K is not stored explicitly,
Manuel Pégourié-Gonnardb05db2a2014-02-01 11:38:05 +010090 * but is implied by the HMAC context */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020091 mbedtls_md_context_t md_ctx; /*!< HMAC context (inc. K) */
92 unsigned char V[MBEDTLS_MD_MAX_SIZE]; /*!< V in the spec */
Manuel Pégourié-Gonnardb05db2a2014-02-01 11:38:05 +010093 int reseed_counter; /*!< reseed counter */
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +010094
Manuel Pégourié-Gonnard658dbed2014-01-30 19:03:45 +010095 /* Administrative state */
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +010096 size_t entropy_len; /*!< entropy bytes grabbed on each (re)seed */
Manuel Pégourié-Gonnardaf786ff2014-01-30 18:44:18 +010097 int prediction_resistance; /*!< enable prediction resistance (Automatic
98 reseed before every random generation) */
Manuel Pégourié-Gonnard658dbed2014-01-30 19:03:45 +010099 int reseed_interval; /*!< reseed interval */
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +0100100
Manuel Pégourié-Gonnard658dbed2014-01-30 19:03:45 +0100101 /* Callbacks */
Manuel Pégourié-Gonnardaf786ff2014-01-30 18:44:18 +0100102 int (*f_entropy)(void *, unsigned char *, size_t); /*!< entropy function */
103 void *p_entropy; /*!< context for the entropy function */
Manuel Pégourié-Gonnard0a4fb092015-05-07 12:50:31 +0100104
105#if defined(MBEDTLS_THREADING_C)
106 mbedtls_threading_mutex_t mutex;
107#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200108} mbedtls_hmac_drbg_context;
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100109
110/**
Manuel Pégourié-Gonnard8d128ef2015-04-28 22:38:08 +0200111 * \brief HMAC_DRBG context initialization
Tillmann Karras588ad502015-09-25 04:27:22 +0200112 * Makes the context ready for mbedtls_hmac_drbg_seed(),
Manuel Pégourié-Gonnardf9e94812015-04-28 22:07:14 +0200113 * mbedtls_hmac_drbg_seed_buf() or
114 * mbedtls_hmac_drbg_free().
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100115 *
Manuel Pégourié-Gonnardf9e94812015-04-28 22:07:14 +0200116 * \param ctx HMAC_DRBG context to be initialized
117 */
118void mbedtls_hmac_drbg_init( mbedtls_hmac_drbg_context *ctx );
119
120/**
121 * \brief HMAC_DRBG initial seeding
Manuel Pégourié-Gonnard8d128ef2015-04-28 22:38:08 +0200122 * Seed and setup entropy source for future reseeds.
Manuel Pégourié-Gonnardf9e94812015-04-28 22:07:14 +0200123 *
124 * \param ctx HMAC_DRBG context to be seeded
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100125 * \param md_info MD algorithm to use for HMAC_DRBG
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +0100126 * \param f_entropy Entropy callback (p_entropy, buffer to fill, buffer
127 * length)
128 * \param p_entropy Entropy context
129 * \param custom Personalization data (Device specific identifiers)
130 * (Can be NULL)
131 * \param len Length of personalization data
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100132 *
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +0100133 * \note The "security strength" as defined by NIST is set to:
134 * 128 bits if md_alg is SHA-1,
135 * 192 bits if md_alg is SHA-224,
136 * 256 bits if md_alg is SHA-256 or higher.
137 * Note that SHA-256 is just as efficient as SHA-224.
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100138 *
139 * \return 0 if successful, or
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200140 * MBEDTLS_ERR_MD_BAD_INPUT_DATA, or
141 * MBEDTLS_ERR_MD_ALLOC_FAILED, or
Manuel Pégourié-Gonnardf9e94812015-04-28 22:07:14 +0200142 * MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED.
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100143 */
Manuel Pégourié-Gonnardf9e94812015-04-28 22:07:14 +0200144int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200145 const mbedtls_md_info_t * md_info,
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +0100146 int (*f_entropy)(void *, unsigned char *, size_t),
147 void *p_entropy,
148 const unsigned char *custom,
149 size_t len );
150
151/**
Manuel Pégourié-Gonnard4e669c62014-01-30 18:06:08 +0100152 * \brief Initilisation of simpified HMAC_DRBG (never reseeds).
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +0100153 * (For use with deterministic ECDSA.)
154 *
155 * \param ctx HMAC_DRBG context to be initialised
156 * \param md_info MD algorithm to use for HMAC_DRBG
157 * \param data Concatenation of entropy string and additional data
158 * \param data_len Length of data in bytes
159 *
160 * \return 0 if successful, or
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200161 * MBEDTLS_ERR_MD_BAD_INPUT_DATA, or
162 * MBEDTLS_ERR_MD_ALLOC_FAILED.
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +0100163 */
Manuel Pégourié-Gonnardf9e94812015-04-28 22:07:14 +0200164int mbedtls_hmac_drbg_seed_buf( mbedtls_hmac_drbg_context *ctx,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200165 const mbedtls_md_info_t * md_info,
Manuel Pégourié-Gonnardfe34a5f2014-01-30 15:06:40 +0100166 const unsigned char *data, size_t data_len );
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100167
168/**
Manuel Pégourié-Gonnardaf786ff2014-01-30 18:44:18 +0100169 * \brief Enable / disable prediction resistance (Default: Off)
170 *
171 * Note: If enabled, entropy is used for ctx->entropy_len before each call!
172 * Only use this if you have ample supply of good entropy!
173 *
174 * \param ctx HMAC_DRBG context
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200175 * \param resistance MBEDTLS_HMAC_DRBG_PR_ON or MBEDTLS_HMAC_DRBG_PR_OFF
Manuel Pégourié-Gonnardaf786ff2014-01-30 18:44:18 +0100176 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200177void mbedtls_hmac_drbg_set_prediction_resistance( mbedtls_hmac_drbg_context *ctx,
Manuel Pégourié-Gonnardaf786ff2014-01-30 18:44:18 +0100178 int resistance );
179
180/**
Manuel Pégourié-Gonnard4e669c62014-01-30 18:06:08 +0100181 * \brief Set the amount of entropy grabbed on each reseed
Manuel Pégourié-Gonnard658dbed2014-01-30 19:03:45 +0100182 * (Default: given by the security strength, which
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200183 * depends on the hash used, see \c mbedtls_hmac_drbg_init() )
Manuel Pégourié-Gonnard4e669c62014-01-30 18:06:08 +0100184 *
185 * \param ctx HMAC_DRBG context
Manuel Pégourié-Gonnard658dbed2014-01-30 19:03:45 +0100186 * \param len Amount of entropy to grab, in bytes
Manuel Pégourié-Gonnard4e669c62014-01-30 18:06:08 +0100187 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200188void mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx,
Manuel Pégourié-Gonnard4e669c62014-01-30 18:06:08 +0100189 size_t len );
190
191/**
Manuel Pégourié-Gonnard658dbed2014-01-30 19:03:45 +0100192 * \brief Set the reseed interval
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200193 * (Default: MBEDTLS_HMAC_DRBG_RESEED_INTERVAL)
Manuel Pégourié-Gonnard658dbed2014-01-30 19:03:45 +0100194 *
195 * \param ctx HMAC_DRBG context
196 * \param interval Reseed interval
197 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200198void mbedtls_hmac_drbg_set_reseed_interval( mbedtls_hmac_drbg_context *ctx,
Manuel Pégourié-Gonnard658dbed2014-01-30 19:03:45 +0100199 int interval );
200
201/**
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100202 * \brief HMAC_DRBG update state
203 *
204 * \param ctx HMAC_DRBG context
205 * \param additional Additional data to update state with, or NULL
206 * \param add_len Length of additional data, or 0
207 *
Gilles Peskine4d237572018-09-13 22:19:57 +0200208 * \return \c 0 on success, or an error from the underlying
209 * hash calculation.
210 *
211 * \note Additional data is optional, pass NULL and 0 as second
212 * third argument if no additional data is being used.
213 */
214int mbedtls_hmac_drbg_update_ret( mbedtls_hmac_drbg_context *ctx,
215 const unsigned char *additional, size_t add_len );
216
217/**
218 * \brief HMAC_DRBG update state
219 *
220 * \warning This function cannot report errors. You should use
221 * mbedtls_hmac_drbg_update_ret() instead.
222 *
223 * \param ctx HMAC_DRBG context
224 * \param additional Additional data to update state with, or NULL
225 * \param add_len Length of additional data, or 0
226 *
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100227 * \note Additional data is optional, pass NULL and 0 as second
228 * third argument if no additional data is being used.
229 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200230void mbedtls_hmac_drbg_update( mbedtls_hmac_drbg_context *ctx,
Gilles Peskine4d237572018-09-13 22:19:57 +0200231 const unsigned char *additional,
232 size_t add_len );
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100233
234/**
Manuel Pégourié-Gonnard8fc484d2014-01-30 18:28:09 +0100235 * \brief HMAC_DRBG reseeding (extracts data from entropy source)
236 *
237 * \param ctx HMAC_DRBG context
238 * \param additional Additional data to add to state (Can be NULL)
239 * \param len Length of additional data
240 *
241 * \return 0 if successful, or
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200242 * MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED
Manuel Pégourié-Gonnard8fc484d2014-01-30 18:28:09 +0100243 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200244int mbedtls_hmac_drbg_reseed( mbedtls_hmac_drbg_context *ctx,
Manuel Pégourié-Gonnard8fc484d2014-01-30 18:28:09 +0100245 const unsigned char *additional, size_t len );
246
247/**
Manuel Pégourié-Gonnard8208d162014-01-30 12:19:26 +0100248 * \brief HMAC_DRBG generate random with additional update input
249 *
Manuel Pégourié-Gonnard658dbed2014-01-30 19:03:45 +0100250 * Note: Automatically reseeds if reseed_counter is reached or PR is enabled.
Manuel Pégourié-Gonnard8208d162014-01-30 12:19:26 +0100251 *
252 * \param p_rng HMAC_DRBG context
253 * \param output Buffer to fill
254 * \param output_len Length of the buffer
255 * \param additional Additional data to update with (can be NULL)
256 * \param add_len Length of additional data (can be 0)
257 *
258 * \return 0 if successful, or
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200259 * MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED, or
260 * MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG, or
261 * MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG.
Manuel Pégourié-Gonnard8208d162014-01-30 12:19:26 +0100262 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200263int mbedtls_hmac_drbg_random_with_add( void *p_rng,
Manuel Pégourié-Gonnard8208d162014-01-30 12:19:26 +0100264 unsigned char *output, size_t output_len,
265 const unsigned char *additional,
266 size_t add_len );
267
268/**
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100269 * \brief HMAC_DRBG generate random
270 *
Manuel Pégourié-Gonnard658dbed2014-01-30 19:03:45 +0100271 * Note: Automatically reseeds if reseed_counter is reached or PR is enabled.
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100272 *
273 * \param p_rng HMAC_DRBG context
274 * \param output Buffer to fill
Manuel Pégourié-Gonnardf6a17d02014-01-31 11:51:42 +0100275 * \param out_len Length of the buffer
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100276 *
Manuel Pégourié-Gonnard8208d162014-01-30 12:19:26 +0100277 * \return 0 if successful, or
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200278 * MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED, or
279 * MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100280 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200281int mbedtls_hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len );
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100282
283/**
284 * \brief Free an HMAC_DRBG context
285 *
286 * \param ctx HMAC_DRBG context to free.
287 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200288void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx );
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100289
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200290#if defined(MBEDTLS_FS_IO)
Manuel Pégourié-Gonnard48bc3e82014-01-30 21:11:16 +0100291/**
292 * \brief Write a seed file
293 *
294 * \param ctx HMAC_DRBG context
295 * \param path Name of the file
296 *
297 * \return 0 if successful, 1 on file error, or
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200298 * MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED
Manuel Pégourié-Gonnard48bc3e82014-01-30 21:11:16 +0100299 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200300int mbedtls_hmac_drbg_write_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path );
Manuel Pégourié-Gonnard48bc3e82014-01-30 21:11:16 +0100301
302/**
303 * \brief Read and update a seed file. Seed is added to this
304 * instance
305 *
306 * \param ctx HMAC_DRBG context
307 * \param path Name of the file
308 *
309 * \return 0 if successful, 1 on file error,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200310 * MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED or
311 * MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG
Manuel Pégourié-Gonnard48bc3e82014-01-30 21:11:16 +0100312 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200313int mbedtls_hmac_drbg_update_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path );
314#endif /* MBEDTLS_FS_IO */
Manuel Pégourié-Gonnard48bc3e82014-01-30 21:11:16 +0100315
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100316
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200317#if defined(MBEDTLS_SELF_TEST)
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100318/**
319 * \brief Checkup routine
320 *
321 * \return 0 if successful, or 1 if the test failed
322 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200323int mbedtls_hmac_drbg_self_test( int verbose );
Manuel Pégourié-Gonnard490bdf32014-01-27 14:03:10 +0100324#endif
325
326#ifdef __cplusplus
327}
328#endif
329
330#endif /* hmac_drbg.h */