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1 /**
2 * \file entropy.h
3 *
4 * \brief Entropy accumulator implementation
5 */
6 /*
7 * Copyright (C) 2006-2016, 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_ENTROPY_H
27 #define MBEDTLS_ENTROPY_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 #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_ENTROPY_FORCE_SHA256)
38 #include "sha512.h"
39 #define MBEDTLS_ENTROPY_SHA512_ACCUMULATOR
40 #else
41 #if defined(MBEDTLS_SHA256_C)
42 #define MBEDTLS_ENTROPY_SHA256_ACCUMULATOR
43 #include "sha256.h"
44 #endif
45 #endif
46
47 #if defined(MBEDTLS_THREADING_C)
48 #include "threading.h"
49 #endif
50
51 #if defined(MBEDTLS_HAVEGE_C)
52 #include "havege.h"
53 #endif
54
55 #define MBEDTLS_ERR_ENTROPY_SOURCE_FAILED -0x003C /**< Critical entropy source failure. */
56 #define MBEDTLS_ERR_ENTROPY_MAX_SOURCES -0x003E /**< No more sources can be added. */
57 #define MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED -0x0040 /**< No sources have been added to poll. */
58 #define MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE -0x003D /**< No strong sources have been added to poll. */
59 #define MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR -0x003F /**< Read/write error in file. */
60
61 /**
62 * \name SECTION: Module settings
63 *
64 * The configuration options you can set for this module are in this section.
65 * Either change them in config.h or define them on the compiler command line.
66 * \{
67 */
68
69 #if !defined(MBEDTLS_ENTROPY_MAX_SOURCES)
70 #define MBEDTLS_ENTROPY_MAX_SOURCES 20 /**< Maximum number of sources supported */
71 #endif
72
73 #if !defined(MBEDTLS_ENTROPY_MAX_GATHER)
74 #define MBEDTLS_ENTROPY_MAX_GATHER 128 /**< Maximum amount requested from entropy sources */
75 #endif
76
77 /* \} name SECTION: Module settings */
78
79 #if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
80 #define MBEDTLS_ENTROPY_BLOCK_SIZE 64 /**< Block size of entropy accumulator (SHA-512) */
81 #else
82 #define MBEDTLS_ENTROPY_BLOCK_SIZE 32 /**< Block size of entropy accumulator (SHA-256) */
83 #endif
84
85 #define MBEDTLS_ENTROPY_MAX_SEED_SIZE 1024 /**< Maximum size of seed we read from seed file */
86 #define MBEDTLS_ENTROPY_SOURCE_MANUAL MBEDTLS_ENTROPY_MAX_SOURCES
87
88 #define MBEDTLS_ENTROPY_SOURCE_STRONG 1 /**< Entropy source is strong */
89 #define MBEDTLS_ENTROPY_SOURCE_WEAK 0 /**< Entropy source is weak */
90
91 #ifdef __cplusplus
92 extern "C" {
93 #endif
94
95 /**
96 * \brief Entropy poll callback pointer
97 *
98 * \param data Callback-specific data pointer
99 * \param output Data to fill
100 * \param len Maximum size to provide
101 * \param olen The actual amount of bytes put into the buffer (Can be 0)
102 *
103 * \return 0 if no critical failures occurred,
104 * MBEDTLS_ERR_ENTROPY_SOURCE_FAILED otherwise
105 */
106 typedef int (*mbedtls_entropy_f_source_ptr)(void *data, unsigned char *output, size_t len,
107 size_t *olen);
108
109 /**
110 * \brief Entropy source state
111 */
112 typedef struct mbedtls_entropy_source_state
113 {
114 mbedtls_entropy_f_source_ptr f_source; /**< The entropy source callback */
115 void * p_source; /**< The callback data pointer */
116 size_t size; /**< Amount received in bytes */
117 size_t threshold; /**< Minimum bytes required before release */
118 int strong; /**< Is the source strong? */
119 }
120 mbedtls_entropy_source_state;
121
122 /**
123 * \brief Entropy context structure
124 */
125 typedef struct mbedtls_entropy_context
126 {
127 int accumulator_started;
128 #if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
129 mbedtls_sha512_context accumulator;
130 #else
131 mbedtls_sha256_context accumulator;
132 #endif
133 int source_count;
134 mbedtls_entropy_source_state source[MBEDTLS_ENTROPY_MAX_SOURCES];
135 #if defined(MBEDTLS_HAVEGE_C)
136 mbedtls_havege_state havege_data;
137 #endif
138 #if defined(MBEDTLS_THREADING_C)
139 mbedtls_threading_mutex_t mutex; /*!< mutex */
140 #endif
141 #if defined(MBEDTLS_ENTROPY_NV_SEED)
142 int initial_entropy_run;
143 #endif
144 }
145 mbedtls_entropy_context;
146
147 /**
148 * \brief Initialize the context
149 *
150 * \param ctx Entropy context to initialize
151 */
152 void mbedtls_entropy_init( mbedtls_entropy_context *ctx );
153
154 /**
155 * \brief Free the data in the context
156 *
157 * \param ctx Entropy context to free
158 */
159 void mbedtls_entropy_free( mbedtls_entropy_context *ctx );
160
161 /**
162 * \brief Adds an entropy source to poll
163 * (Thread-safe if MBEDTLS_THREADING_C is enabled)
164 *
165 * \param ctx Entropy context
166 * \param f_source Entropy function
167 * \param p_source Function data
168 * \param threshold Minimum required from source before entropy is released
169 * ( with mbedtls_entropy_func() ) (in bytes)
170 * \param strong MBEDTLS_ENTROPY_SOURCE_STRONG or
171 * MBEDTLS_ENTROPY_SOURCE_WEAK.
172 * At least one strong source needs to be added.
173 * Weaker sources (such as the cycle counter) can be used as
174 * a complement.
175 *
176 * \return 0 if successful or MBEDTLS_ERR_ENTROPY_MAX_SOURCES
177 */
178 int mbedtls_entropy_add_source( mbedtls_entropy_context *ctx,
179 mbedtls_entropy_f_source_ptr f_source, void *p_source,
180 size_t threshold, int strong );
181
182 /**
183 * \brief Trigger an extra gather poll for the accumulator
184 * (Thread-safe if MBEDTLS_THREADING_C is enabled)
185 *
186 * \param ctx Entropy context
187 *
188 * \return 0 if successful, or MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
189 */
190 int mbedtls_entropy_gather( mbedtls_entropy_context *ctx );
191
192 /**
193 * \brief Retrieve entropy from the accumulator
194 * (Maximum length: MBEDTLS_ENTROPY_BLOCK_SIZE)
195 * (Thread-safe if MBEDTLS_THREADING_C is enabled)
196 *
197 * \param data Entropy context
198 * \param output Buffer to fill
199 * \param len Number of bytes desired, must be at most MBEDTLS_ENTROPY_BLOCK_SIZE
200 *
201 * \return 0 if successful, or MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
202 */
203 int mbedtls_entropy_func( void *data, unsigned char *output, size_t len );
204
205 /**
206 * \brief Add data to the accumulator manually
207 * (Thread-safe if MBEDTLS_THREADING_C is enabled)
208 *
209 * \param ctx Entropy context
210 * \param data Data to add
211 * \param len Length of data
212 *
213 * \return 0 if successful
214 */
215 int mbedtls_entropy_update_manual( mbedtls_entropy_context *ctx,
216 const unsigned char *data, size_t len );
217
218 #if defined(MBEDTLS_ENTROPY_NV_SEED)
219 /**
220 * \brief Trigger an update of the seed file in NV by using the
221 * current entropy pool.
222 *
223 * \param ctx Entropy context
224 *
225 * \return 0 if successful
226 */
227 int mbedtls_entropy_update_nv_seed( mbedtls_entropy_context *ctx );
228 #endif /* MBEDTLS_ENTROPY_NV_SEED */
229
230 #if defined(MBEDTLS_FS_IO)
231 /**
232 * \brief Write a seed file
233 *
234 * \param ctx Entropy context
235 * \param path Name of the file
236 *
237 * \return 0 if successful,
238 * MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR on file error, or
239 * MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
240 */
241 int mbedtls_entropy_write_seed_file( mbedtls_entropy_context *ctx, const char *path );
242
243 /**
244 * \brief Read and update a seed file. Seed is added to this
245 * instance. No more than MBEDTLS_ENTROPY_MAX_SEED_SIZE bytes are
246 * read from the seed file. The rest is ignored.
247 *
248 * \param ctx Entropy context
249 * \param path Name of the file
250 *
251 * \return 0 if successful,
252 * MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR on file error,
253 * MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
254 */
255 int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *path );
256 #endif /* MBEDTLS_FS_IO */
257
258 #if defined(MBEDTLS_SELF_TEST)
259 /**
260 * \brief Checkup routine
261 *
262 * This module self-test also calls the entropy self-test,
263 * mbedtls_entropy_source_self_test();
264 *
265 * \return 0 if successful, or 1 if a test failed
266 */
267 int mbedtls_entropy_self_test( int verbose );
268
269 #if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
270 /**
271 * \brief Checkup routine
272 *
273 * Verifies the integrity of the hardware entropy source
274 * provided by the function 'mbedtls_hardware_poll()'.
275 *
276 * Note this is the only hardware entropy source that is known
277 * at link time, and other entropy sources configured
278 * dynamically at runtime by the function
279 * mbedtls_entropy_add_source() will not be tested.
280 *
281 * \return 0 if successful, or 1 if a test failed
282 */
283 int mbedtls_entropy_source_self_test( int verbose );
284 #endif /* MBEDTLS_ENTROPY_HARDWARE_ALT */
285 #endif /* MBEDTLS_SELF_TEST */
286
287 #ifdef __cplusplus
288 }
289 #endif
290
291 #endif /* entropy.h */
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