hmac_drbg.h

Go to the documentation of this file.

#ifndef MBEDTLS_HMAC_DRBG_H
#define MBEDTLS_HMAC_DRBG_H

#include "md.h"

#if defined(MBEDTLS_THREADING_C)
#include "mbedtls/threading.h"
#endif

/*
 * Error codes
 */
#define MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG -0x0003 
#define MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG -0x0005 
#define MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR -0x0007 
#define MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED -0x0009 
#if !defined(MBEDTLS_HMAC_DRBG_RESEED_INTERVAL)
#define MBEDTLS_HMAC_DRBG_RESEED_INTERVAL 10000 
#endif

#if !defined(MBEDTLS_HMAC_DRBG_MAX_INPUT)
#define MBEDTLS_HMAC_DRBG_MAX_INPUT 256 
#endif

#if !defined(MBEDTLS_HMAC_DRBG_MAX_REQUEST)
#define MBEDTLS_HMAC_DRBG_MAX_REQUEST 1024 
#endif

#if !defined(MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT)
#define MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT 384 
#endif

/* \} name SECTION: Module settings */

#define MBEDTLS_HMAC_DRBG_PR_OFF 0 
#define MBEDTLS_HMAC_DRBG_PR_ON 1 
#ifdef __cplusplus
extern "C" {
#endif

typedef struct
{
 /* Working state: the key K is not stored explicitely,
 * but is implied by the HMAC context */
 mbedtls_md_context_t md_ctx; 
 unsigned char V[MBEDTLS_MD_MAX_SIZE]; 
 int reseed_counter; 
 /* Administrative state */
 size_t entropy_len; 
 int prediction_resistance; 
 int reseed_interval; 
 /* Callbacks */
 int (*f_entropy)(void *, unsigned char *, size_t); 
 void *p_entropy; 
#if defined(MBEDTLS_THREADING_C)
 mbedtls_threading_mutex_t mutex;
#endif
} mbedtls_hmac_drbg_context;

void mbedtls_hmac_drbg_init( mbedtls_hmac_drbg_context *ctx );

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 );

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 );

void mbedtls_hmac_drbg_set_prediction_resistance( mbedtls_hmac_drbg_context *ctx,
 int resistance );

void mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx,
 size_t len );

void mbedtls_hmac_drbg_set_reseed_interval( mbedtls_hmac_drbg_context *ctx,
 int interval );

void mbedtls_hmac_drbg_update( mbedtls_hmac_drbg_context *ctx,
 const unsigned char *additional, size_t add_len );

int mbedtls_hmac_drbg_reseed( mbedtls_hmac_drbg_context *ctx,
 const unsigned char *additional, size_t len );

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 );

int mbedtls_hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len );

void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx );

#if defined(MBEDTLS_FS_IO)

int mbedtls_hmac_drbg_write_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path );

int mbedtls_hmac_drbg_update_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path );
#endif /* MBEDTLS_FS_IO */


#if defined(MBEDTLS_SELF_TEST)

int mbedtls_hmac_drbg_self_test( int verbose );
#endif

#ifdef __cplusplus
}
#endif

#endif /* hmac_drbg.h */