mbed TLS v2.16.12
hmac_drbg.h
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1 
10 /*
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53 #ifndef MBEDTLS_HMAC_DRBG_H
54 #define MBEDTLS_HMAC_DRBG_H
55 
56 #if !defined(MBEDTLS_CONFIG_FILE)
57 #include "config.h"
58 #else
59 #include MBEDTLS_CONFIG_FILE
60 #endif
61 
62 #include "md.h"
63 
64 #if defined(MBEDTLS_THREADING_C)
65 #include "threading.h"
66 #endif
67 
68 /*
69  * Error codes
70  */
72 #define MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG -0x0003
73 
74 #define MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG -0x0005
75 
76 #define MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR -0x0007
77 
78 #define MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED -0x0009
79 
88 #if !defined(MBEDTLS_HMAC_DRBG_RESEED_INTERVAL)
89 #define MBEDTLS_HMAC_DRBG_RESEED_INTERVAL 10000
90 #endif
91 
92 #if !defined(MBEDTLS_HMAC_DRBG_MAX_INPUT)
93 #define MBEDTLS_HMAC_DRBG_MAX_INPUT 256
94 #endif
95 
96 #if !defined(MBEDTLS_HMAC_DRBG_MAX_REQUEST)
97 #define MBEDTLS_HMAC_DRBG_MAX_REQUEST 1024
98 #endif
99 
100 #if !defined(MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT)
101 #define MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT 384
102 #endif
103 
104 /* \} name SECTION: Module settings */
105 
106 #define MBEDTLS_HMAC_DRBG_PR_OFF 0
107 #define MBEDTLS_HMAC_DRBG_PR_ON 1
109 #ifdef __cplusplus
110 extern "C" {
111 #endif
112 
117 {
118  /* Working state: the key K is not stored explicitly,
119  * but is implied by the HMAC context */
121  unsigned char V[MBEDTLS_MD_MAX_SIZE];
124  /* Administrative state */
125  size_t entropy_len;
130  /* Callbacks */
131  int (*f_entropy)(void *, unsigned char *, size_t);
132  void *p_entropy;
134 #if defined(MBEDTLS_THREADING_C)
135  /* Invariant: the mutex is initialized if and only if
136  * md_ctx->md_info != NULL. This means that the mutex is initialized
137  * during the initial seeding in mbedtls_hmac_drbg_seed() or
138  * mbedtls_hmac_drbg_seed_buf() and freed in mbedtls_ctr_drbg_free().
139  *
140  * Note that this invariant may change without notice. Do not rely on it
141  * and do not access the mutex directly in application code.
142  */
144 #endif
146 
160 
193 #if defined(MBEDTLS_THREADING_C)
194 
201 #endif /* MBEDTLS_THREADING_C */
202 
230  const mbedtls_md_info_t * md_info,
231  int (*f_entropy)(void *, unsigned char *, size_t),
232  void *p_entropy,
233  const unsigned char *custom,
234  size_t len );
235 
242 #if defined(MBEDTLS_THREADING_C)
243 
250 #endif /* MBEDTLS_THREADING_C */
251 
265  const mbedtls_md_info_t * md_info,
266  const unsigned char *data, size_t data_len );
267 
282  int resistance );
283 
294  size_t len );
295 
309  int interval );
310 
329  const unsigned char *additional, size_t add_len );
330 
356  const unsigned char *additional, size_t len );
357 
389 int mbedtls_hmac_drbg_random_with_add( void *p_rng,
390  unsigned char *output, size_t output_len,
391  const unsigned char *additional,
392  size_t add_len );
393 
400 #if defined(MBEDTLS_THREADING_C)
401 
407 #endif /* MBEDTLS_THREADING_C */
408 
421 int mbedtls_hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len );
422 
430 
431 #if ! defined(MBEDTLS_DEPRECATED_REMOVED)
432 #if defined(MBEDTLS_DEPRECATED_WARNING)
433 #define MBEDTLS_DEPRECATED __attribute__((deprecated))
434 #else
435 #define MBEDTLS_DEPRECATED
436 #endif
437 
451  const unsigned char *additional, size_t add_len );
452 #undef MBEDTLS_DEPRECATED
453 #endif /* !MBEDTLS_DEPRECATED_REMOVED */
454 
455 #if defined(MBEDTLS_FS_IO)
456 
468 
484 #endif /* MBEDTLS_FS_IO */
485 
486 
487 #if defined(MBEDTLS_SELF_TEST)
488 
494 int mbedtls_hmac_drbg_self_test( int verbose );
495 #endif
496 
497 #ifdef __cplusplus
498 }
499 #endif
500 
501 #endif /* hmac_drbg.h */
int mbedtls_hmac_drbg_seed(mbedtls_hmac_drbg_context *ctx, const mbedtls_md_info_t *md_info, int(*f_entropy)(void *, unsigned char *, size_t), void *p_entropy, const unsigned char *custom, size_t len)
HMAC_DRBG initial seeding.
#define MBEDTLS_MD_MAX_SIZE
Definition: md.h:102
int mbedtls_hmac_drbg_seed_buf(mbedtls_hmac_drbg_context *ctx, const mbedtls_md_info_t *md_info, const unsigned char *data, size_t data_len)
Initilisation of simpified HMAC_DRBG (never reseeds).
void mbedtls_hmac_drbg_set_reseed_interval(mbedtls_hmac_drbg_context *ctx, int interval)
Set the reseed interval.
void mbedtls_hmac_drbg_free(mbedtls_hmac_drbg_context *ctx)
This function resets HMAC_DRBG context to the state immediately after initial call of mbedtls_hmac_dr...
int mbedtls_hmac_drbg_random(void *p_rng, unsigned char *output, size_t out_len)
This function uses HMAC_DRBG to generate random data.
Configuration options (set of defines)
int mbedtls_hmac_drbg_self_test(int verbose)
The HMAC_DRBG Checkup routine.
mbedtls_threading_mutex_t mutex
Definition: hmac_drbg.h:143
int(* f_entropy)(void *, unsigned char *, size_t)
Definition: hmac_drbg.h:131
unsigned char V[MBEDTLS_MD_MAX_SIZE]
Definition: hmac_drbg.h:121
Threading abstraction layer.
struct mbedtls_hmac_drbg_context mbedtls_hmac_drbg_context
#define MBEDTLS_DEPRECATED
Definition: hmac_drbg.h:435
MBEDTLS_DEPRECATED void mbedtls_hmac_drbg_update(mbedtls_hmac_drbg_context *ctx, const unsigned char *additional, size_t add_len)
This function updates the state of the HMAC_DRBG context.
int mbedtls_hmac_drbg_update_seed_file(mbedtls_hmac_drbg_context *ctx, const char *path)
This function reads and updates a seed file. The seed is added to this instance.
This file contains the generic message-digest wrapper.
void mbedtls_hmac_drbg_init(mbedtls_hmac_drbg_context *ctx)
HMAC_DRBG context initialization.
int mbedtls_hmac_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 an HMAC_DRBG instance with additional data and uses it to generate random data...
int mbedtls_hmac_drbg_reseed(mbedtls_hmac_drbg_context *ctx, const unsigned char *additional, size_t len)
This function reseeds the HMAC_DRBG context, that is extracts data from the entropy source...
struct mbedtls_md_info_t mbedtls_md_info_t
Definition: md.h:110
mbedtls_md_context_t md_ctx
Definition: hmac_drbg.h:120
int mbedtls_hmac_drbg_write_seed_file(mbedtls_hmac_drbg_context *ctx, const char *path)
This function writes a seed file.
int mbedtls_hmac_drbg_update_ret(mbedtls_hmac_drbg_context *ctx, const unsigned char *additional, size_t add_len)
This function updates the state of the HMAC_DRBG context.
void mbedtls_hmac_drbg_set_entropy_len(mbedtls_hmac_drbg_context *ctx, size_t len)
This function sets the amount of entropy grabbed on each seed or reseed.
void mbedtls_hmac_drbg_set_prediction_resistance(mbedtls_hmac_drbg_context *ctx, int resistance)
This function turns prediction resistance on or off. The default value is off.