mbed TLS v2.14.1

ctr_drbg.h
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1
17 /*
18 * Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved
19 * SPDX-License-Identifier: Apache-2.0
20 *
21 * Licensed under the Apache License, Version 2.0 (the "License"); you may
22 * not use this file except in compliance with the License.
23 * You may obtain a copy of the License at
24 *
25 * http://www.apache.org/licenses/LICENSE-2.0
26 *
27 * Unless required by applicable law or agreed to in writing, software
28 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
29 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
30 * See the License for the specific language governing permissions and
31 * limitations under the License.
32 *
33 * This file is part of Mbed TLS (https://tls.mbed.org)
34 */
35
36 #ifndef MBEDTLS_CTR_DRBG_H
37 #define MBEDTLS_CTR_DRBG_H
38
39 #include "aes.h"
40
41 #if defined(MBEDTLS_THREADING_C)
42 #include "threading.h"
43 #endif
44
45 #define MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED -0x0034
46 #define MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG -0x0036
47 #define MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG -0x0038
48 #define MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR -0x003A
50 #define MBEDTLS_CTR_DRBG_BLOCKSIZE 16
52 #if defined(MBEDTLS_CTR_DRBG_USE_128_BIT_KEY)
53 #define MBEDTLS_CTR_DRBG_KEYSIZE 16
54 #else
55 #define MBEDTLS_CTR_DRBG_KEYSIZE 32
56 #endif
57
58 #define MBEDTLS_CTR_DRBG_KEYBITS ( MBEDTLS_CTR_DRBG_KEYSIZE * 8 )
59 #define MBEDTLS_CTR_DRBG_SEEDLEN ( MBEDTLS_CTR_DRBG_KEYSIZE + MBEDTLS_CTR_DRBG_BLOCKSIZE )
70 #if !defined(MBEDTLS_CTR_DRBG_ENTROPY_LEN)
71 #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_ENTROPY_FORCE_SHA256)
72 #define MBEDTLS_CTR_DRBG_ENTROPY_LEN 48
73
77 #else
78 #define MBEDTLS_CTR_DRBG_ENTROPY_LEN 32
79
83 #endif
84 #endif
85
86 #if !defined(MBEDTLS_CTR_DRBG_RESEED_INTERVAL)
87 #define MBEDTLS_CTR_DRBG_RESEED_INTERVAL 10000
88
89 #endif
90
91 #if !defined(MBEDTLS_CTR_DRBG_MAX_INPUT)
92 #define MBEDTLS_CTR_DRBG_MAX_INPUT 256
93
94 #endif
95
96 #if !defined(MBEDTLS_CTR_DRBG_MAX_REQUEST)
97 #define MBEDTLS_CTR_DRBG_MAX_REQUEST 1024
98
99 #endif
100
101 #if !defined(MBEDTLS_CTR_DRBG_MAX_SEED_INPUT)
102 #define MBEDTLS_CTR_DRBG_MAX_SEED_INPUT 384
103
104 #endif
105
106 /* \} name SECTION: Module settings */
107
108 #define MBEDTLS_CTR_DRBG_PR_OFF 0
109
110 #define MBEDTLS_CTR_DRBG_PR_ON 1
111
113 #ifdef __cplusplus
114 extern "C" {
115 #endif
116
120 typedef struct mbedtls_ctr_drbg_context
121 {
122 unsigned char counter[16];
123 int reseed_counter;
124 int prediction_resistance;
128 size_t entropy_len;
130 int reseed_interval;
132 mbedtls_aes_context aes_ctx;
134 /*
135 * Callbacks (Entropy)
136 */
137 int (*f_entropy)(void *, unsigned char *, size_t);
140 void *p_entropy;
142 #if defined(MBEDTLS_THREADING_C)
143 mbedtls_threading_mutex_t mutex;
144 #endif
145 }
146 mbedtls_ctr_drbg_context;
147
155 void mbedtls_ctr_drbg_init( mbedtls_ctr_drbg_context *ctx );
156
176 int mbedtls_ctr_drbg_seed( mbedtls_ctr_drbg_context *ctx,
177 int (*f_entropy)(void *, unsigned char *, size_t),
178 void *p_entropy,
179 const unsigned char *custom,
180 size_t len );
181
187 void mbedtls_ctr_drbg_free( mbedtls_ctr_drbg_context *ctx );
188
201 void mbedtls_ctr_drbg_set_prediction_resistance( mbedtls_ctr_drbg_context *ctx,
202 int resistance );
203
212 void mbedtls_ctr_drbg_set_entropy_len( mbedtls_ctr_drbg_context *ctx,
213 size_t len );
214
222 void mbedtls_ctr_drbg_set_reseed_interval( mbedtls_ctr_drbg_context *ctx,
223 int interval );
224
236 int mbedtls_ctr_drbg_reseed( mbedtls_ctr_drbg_context *ctx,
237 const unsigned char *additional, size_t len );
238
253 int mbedtls_ctr_drbg_update_ret( mbedtls_ctr_drbg_context *ctx,
254 const unsigned char *additional,
255 size_t add_len );
256
272 void mbedtls_ctr_drbg_update( mbedtls_ctr_drbg_context *ctx,
273 const unsigned char *additional,
274 size_t add_len );
275
293 int mbedtls_ctr_drbg_random_with_add( void *p_rng,
294 unsigned char *output, size_t output_len,
295 const unsigned char *additional, size_t add_len );
296
311 int mbedtls_ctr_drbg_random( void *p_rng,
312 unsigned char *output, size_t output_len );
313
314 #if defined(MBEDTLS_FS_IO)
315
326 int mbedtls_ctr_drbg_write_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path );
327
340 int mbedtls_ctr_drbg_update_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path );
341 #endif /* MBEDTLS_FS_IO */
342
349 int mbedtls_ctr_drbg_self_test( int verbose );
350
351 /* Internal functions (do not call directly) */
352 int mbedtls_ctr_drbg_seed_entropy_len( mbedtls_ctr_drbg_context *,
353 int (*)(void *, unsigned char *, size_t), void *,
354 const unsigned char *, size_t, size_t );
355
356 #ifdef __cplusplus
357 }
358 #endif
359
360 #endif /* ctr_drbg.h */
mbedtls_ctr_drbg_context::f_entropy
int(* f_entropy)(void *, unsigned char *, size_t)
Definition: ctr_drbg.h:137
mbedtls_ctr_drbg_context
The CTR_DRBG context structure.
Definition: ctr_drbg.h:120
mbedtls_ctr_drbg_free
void mbedtls_ctr_drbg_free(mbedtls_ctr_drbg_context *ctx)
This function clears CTR_CRBG context data.
mbedtls_ctr_drbg_update
void mbedtls_ctr_drbg_update(mbedtls_ctr_drbg_context *ctx, const unsigned char *additional, size_t add_len)
This function updates the state of the CTR_DRBG context.
mbedtls_ctr_drbg_seed_entropy_len
int mbedtls_ctr_drbg_seed_entropy_len(mbedtls_ctr_drbg_context *, int(*)(void *, unsigned char *, size_t), void *, const unsigned char *, size_t, size_t)
mbedtls_ctr_drbg_context::prediction_resistance
int prediction_resistance
Definition: ctr_drbg.h:124
mbedtls_ctr_drbg_init
void mbedtls_ctr_drbg_init(mbedtls_ctr_drbg_context *ctx)
This function initializes the CTR_DRBG context, and prepares it for mbedtls_ctr_drbg_seed() or mbedtl...
mbedtls_ctr_drbg_random
int mbedtls_ctr_drbg_random(void *p_rng, unsigned char *output, size_t output_len)
This function uses CTR_DRBG to generate random data.
mbedtls_ctr_drbg_write_seed_file
int mbedtls_ctr_drbg_write_seed_file(mbedtls_ctr_drbg_context *ctx, const char *path)
This function writes a seed file.
mbedtls_ctr_drbg_set_reseed_interval
void mbedtls_ctr_drbg_set_reseed_interval(mbedtls_ctr_drbg_context *ctx, int interval)
This function sets the reseed interval. The default value is MBEDTLS_CTR_DRBG_RESEED_INTERVAL.
mbedtls_ctr_drbg_set_prediction_resistance
void mbedtls_ctr_drbg_set_prediction_resistance(mbedtls_ctr_drbg_context *ctx, int resistance)
This function turns prediction resistance on or off. The default value is off.
mbedtls_ctr_drbg_reseed
int mbedtls_ctr_drbg_reseed(mbedtls_ctr_drbg_context *ctx, const unsigned char *additional, size_t len)
This function reseeds the CTR_DRBG context, that is extracts data from the entropy source...
threading.h
Threading abstraction layer.
mbedtls_ctr_drbg_update_seed_file
int mbedtls_ctr_drbg_update_seed_file(mbedtls_ctr_drbg_context *ctx, const char *path)
This function reads and updates a seed file. The seed is added to this instance.
mbedtls_ctr_drbg_random_with_add
int mbedtls_ctr_drbg_random_with_add(void *p_rng, unsigned char *output, size_t output_len, const unsigned char *additional, size_t add_len)
This function updates a CTR_DRBG instance with additional data and uses it to generate random data...
mbedtls_ctr_drbg_update_ret
int mbedtls_ctr_drbg_update_ret(mbedtls_ctr_drbg_context *ctx, const unsigned char *additional, size_t add_len)
This function updates the state of the CTR_DRBG context.
mbedtls_ctr_drbg_set_entropy_len
void mbedtls_ctr_drbg_set_entropy_len(mbedtls_ctr_drbg_context *ctx, size_t len)
This function sets the amount of entropy grabbed on each seed or reseed. The default value is MBEDTLS...
mbedtls_ctr_drbg_context::reseed_interval
int reseed_interval
Definition: ctr_drbg.h:130
aes.h
This file contains AES definitions and functions.
mbedtls_ctr_drbg_context
struct mbedtls_ctr_drbg_context mbedtls_ctr_drbg_context
The CTR_DRBG context structure.
mbedtls_ctr_drbg_seed
int mbedtls_ctr_drbg_seed(mbedtls_ctr_drbg_context *ctx, int(*f_entropy)(void *, unsigned char *, size_t), void *p_entropy, const unsigned char *custom, size_t len)
This function seeds and sets up the CTR_DRBG entropy source for future reseeds.
mbedtls_ctr_drbg_self_test
int mbedtls_ctr_drbg_self_test(int verbose)
The CTR_DRBG checkup routine.
mbedtls_ctr_drbg_context::entropy_len
size_t entropy_len
Definition: ctr_drbg.h:128
mbedtls_ctr_drbg_context::counter
unsigned char counter[16]
Definition: ctr_drbg.h:122
mbedtls_ctr_drbg_context::aes_ctx
mbedtls_aes_context aes_ctx
Definition: ctr_drbg.h:132
mbedtls_ctr_drbg_context::reseed_counter
int reseed_counter
Definition: ctr_drbg.h:123
mbedtls_aes_context
The AES context-type definition.
Definition: aes.h:86
mbedtls_ctr_drbg_context::p_entropy
void * p_entropy
Definition: ctr_drbg.h:140