mbed TLS v2.7.17
ctr_drbg.h
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1 
34 /*
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77 
78 #ifndef MBEDTLS_CTR_DRBG_H
79 #define MBEDTLS_CTR_DRBG_H
80 
81 #if !defined(MBEDTLS_CONFIG_FILE)
82 #include "config.h"
83 #else
84 #include MBEDTLS_CONFIG_FILE
85 #endif
86 
87 #include "aes.h"
88 
89 #if defined(MBEDTLS_THREADING_C)
90 #include "threading.h"
91 #endif
92 
93 #define MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED -0x0034
94 #define MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG -0x0036
95 #define MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG -0x0038
96 #define MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR -0x003A
98 #define MBEDTLS_CTR_DRBG_BLOCKSIZE 16
99 #define MBEDTLS_CTR_DRBG_KEYSIZE 32
100 #define MBEDTLS_CTR_DRBG_KEYBITS ( MBEDTLS_CTR_DRBG_KEYSIZE * 8 )
101 #define MBEDTLS_CTR_DRBG_SEEDLEN ( MBEDTLS_CTR_DRBG_KEYSIZE + MBEDTLS_CTR_DRBG_BLOCKSIZE )
116 #if !defined(MBEDTLS_CTR_DRBG_ENTROPY_LEN)
117 #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_ENTROPY_FORCE_SHA256)
118 
121 #define MBEDTLS_CTR_DRBG_ENTROPY_LEN 48
122 
123 #else /* defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_ENTROPY_FORCE_SHA256) */
124 
132 #define MBEDTLS_CTR_DRBG_ENTROPY_LEN 32
133 #endif /* defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_ENTROPY_FORCE_SHA256) */
134 #endif /* !defined(MBEDTLS_CTR_DRBG_ENTROPY_LEN) */
135 
136 #if !defined(MBEDTLS_CTR_DRBG_RESEED_INTERVAL)
137 #define MBEDTLS_CTR_DRBG_RESEED_INTERVAL 10000
138 
139 #endif
140 
141 #if !defined(MBEDTLS_CTR_DRBG_MAX_INPUT)
142 #define MBEDTLS_CTR_DRBG_MAX_INPUT 256
143 
144 #endif
145 
146 #if !defined(MBEDTLS_CTR_DRBG_MAX_REQUEST)
147 #define MBEDTLS_CTR_DRBG_MAX_REQUEST 1024
148 
149 #endif
150 
151 #if !defined(MBEDTLS_CTR_DRBG_MAX_SEED_INPUT)
152 #define MBEDTLS_CTR_DRBG_MAX_SEED_INPUT 384
153 
154 #endif
155 
156 /* \} name SECTION: Module settings */
157 
158 #define MBEDTLS_CTR_DRBG_PR_OFF 0
159 
160 #define MBEDTLS_CTR_DRBG_PR_ON 1
161 
163 #ifdef __cplusplus
164 extern "C" {
165 #endif
166 
170 typedef struct
171 {
172  unsigned char counter[16];
178  size_t entropy_len;
184  /*
185  * Callbacks (Entropy)
186  */
187  int (*f_entropy)(void *, unsigned char *, size_t);
190  void *p_entropy;
192 #if defined(MBEDTLS_THREADING_C)
194 #endif
195 }
197 
206 
241 #if MBEDTLS_CTR_DRBG_ENTROPY_LEN < MBEDTLS_CTR_DRBG_KEYSIZE * 3 / 2
242 
249 #endif
250 
277  int (*f_entropy)(void *, unsigned char *, size_t),
278  void *p_entropy,
279  const unsigned char *custom,
280  size_t len );
281 
288 
303  int resistance );
304 
320  size_t len );
321 
335  int interval );
336 
353  const unsigned char *additional, size_t len );
354 
371  const unsigned char *additional,
372  size_t add_len );
373 
392  const unsigned char *additional,
393  size_t add_len );
394 
421 int mbedtls_ctr_drbg_random_with_add( void *p_rng,
422  unsigned char *output, size_t output_len,
423  const unsigned char *additional, size_t add_len );
424 
441 int mbedtls_ctr_drbg_random( void *p_rng,
442  unsigned char *output, size_t output_len );
443 
444 #if defined(MBEDTLS_FS_IO)
445 
456 int mbedtls_ctr_drbg_write_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path );
457 
472 int mbedtls_ctr_drbg_update_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path );
473 #endif /* MBEDTLS_FS_IO */
474 
480 int mbedtls_ctr_drbg_self_test( int verbose );
481 
482 /* Internal functions (do not call directly) */
484  int (*)(void *, unsigned char *, size_t), void *,
485  const unsigned char *, size_t, size_t );
486 
487 #ifdef __cplusplus
488 }
489 #endif
490 
491 #endif /* ctr_drbg.h */
The CTR_DRBG context structure.
Definition: ctr_drbg.h:170
void mbedtls_ctr_drbg_free(mbedtls_ctr_drbg_context *ctx)
This function clears CTR_CRBG context data.
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.
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)
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_threading_mutex_t mutex
Definition: ctr_drbg.h:193
Configuration options (set of defines)
int mbedtls_ctr_drbg_random(void *p_rng, unsigned char *output, size_t output_len)
This function uses CTR_DRBG to generate random data.
int mbedtls_ctr_drbg_write_seed_file(mbedtls_ctr_drbg_context *ctx, const char *path)
This function writes a seed file.
void mbedtls_ctr_drbg_set_reseed_interval(mbedtls_ctr_drbg_context *ctx, int interval)
This function sets the reseed interval.
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.
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 abstraction layer.
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.
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...
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.
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 Advanced Encryption Standard (AES) specifies a FIPS-approved cryptographic algorithm that can be ...
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.
int mbedtls_ctr_drbg_self_test(int verbose)
The CTR_DRBG checkup routine.
mbedtls_aes_context aes_ctx
Definition: ctr_drbg.h:182
The AES context-type definition.
Definition: aes.h:99