#include "config.h"
#include "config.h"
#include MBEDTLS_CONFIG_FILE
#include MBEDTLS_CONFIG_FILE
#include "aes.h"
#include "aes.h"
#include "threading.h"
#include "threading.h"
#define MBEDTLS_CTR_DRBG_H
#define MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED -52 /**< The entropy source failed. */
#define MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG -54 /**< The requested random buffer length is too big. */
#define MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG -56 /**< The input (entropy + additional data) is too large. */
#define MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR -3A /**< Read or write error in file. */
#define MBEDTLS_CTR_DRBG_BLOCKSIZE 16 /**< The block size used by the cipher. */
#define MBEDTLS_CTR_DRBG_KEYSIZE 16 /**< The key size used by the cipher (compile-time choice: 128 bits). */
#define MBEDTLS_CTR_DRBG_KEYSIZE 32 /**< The key size used by the cipher (compile-time choice: 256 bits). */
#define MBEDTLS_CTR_DRBG_KEYBITS ( MBEDTLS_CTR_DRBG_KEYSIZE * 8 ) /**< The key size for the DRBG operation, in bits. */
#define MBEDTLS_CTR_DRBG_SEEDLEN ( MBEDTLS_CTR_DRBG_KEYSIZE + MBEDTLS_CTR_DRBG_BLOCKSIZE ) /**< The seed length, calculated as (counter + AES key). */
#define MBEDTLS_CTR_DRBG_ENTROPY_LEN 48
#define MBEDTLS_CTR_DRBG_ENTROPY_LEN 32
#define MBEDTLS_CTR_DRBG_RESEED_INTERVAL 10000
#define MBEDTLS_CTR_DRBG_MAX_INPUT 256
#define MBEDTLS_CTR_DRBG_MAX_REQUEST 1024
#define MBEDTLS_CTR_DRBG_MAX_SEED_INPUT 384
#define MBEDTLS_CTR_DRBG_PR_OFF 0
#define MBEDTLS_CTR_DRBG_PR_ON 1
/**< Prediction resistance is disabled. */
#define MBEDTLS_DEPRECATED __attribute__((deprecated))
#define MBEDTLS_DEPRECATED
void mbedtls_ctr_drbg_init( mbedtls_ctr_drbg_context *ctx );
/** * \brief This function initializes the CTR_DRBG context, * and prepares it for mbedtls_ctr_drbg_seed() * or mbedtls_ctr_drbg_free(). * * \param ctx The CTR_DRBG context to initialize. */
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 );
/** * \brief This function seeds and sets up the CTR_DRBG * entropy source for future reseeds. * * \note Personalization data can be provided in addition to the more generic * entropy source, to make this instantiation as unique as possible. * * \param ctx The CTR_DRBG context to seed. * \param f_entropy The entropy callback, taking as arguments the * \p p_entropy context, the buffer to fill, and the length of the buffer. * \param p_entropy The entropy context. * \param custom Personalization data, that is device-specific identifiers. Can be NULL. * \param len The length of the personalization data. * * \return \c 0 on success. * \return #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED on failure. */
void mbedtls_ctr_drbg_free( mbedtls_ctr_drbg_context *ctx );
/** * \brief This function clears CTR_CRBG context data. * * \param ctx The CTR_DRBG context to clear. */
void mbedtls_ctr_drbg_set_prediction_resistance( mbedtls_ctr_drbg_context *ctx,
int resistance );
/** * \brief This function turns prediction resistance on or off. * The default value is off. * * \note If enabled, entropy is gathered at the beginning of * every call to mbedtls_ctr_drbg_random_with_add(). * Only use this if your entropy source has sufficient * throughput. * * \param ctx The CTR_DRBG context. * \param resistance #MBEDTLS_CTR_DRBG_PR_ON or #MBEDTLS_CTR_DRBG_PR_OFF. */
void mbedtls_ctr_drbg_set_entropy_len( mbedtls_ctr_drbg_context *ctx,
size_t len );
/** * \brief This function sets the amount of entropy grabbed on each * seed or reseed. The default value is * #MBEDTLS_CTR_DRBG_ENTROPY_LEN. * * \param ctx The CTR_DRBG context. * \param len The amount of entropy to grab. */
void mbedtls_ctr_drbg_set_reseed_interval( mbedtls_ctr_drbg_context *ctx,
int interval );
/** * \brief This function sets the reseed interval. * The default value is #MBEDTLS_CTR_DRBG_RESEED_INTERVAL. * * \param ctx The CTR_DRBG context. * \param interval The reseed interval. */
int mbedtls_ctr_drbg_reseed( mbedtls_ctr_drbg_context *ctx,
const unsigned char *additional, size_t len );
/** * \brief This function reseeds the CTR_DRBG context, that is * extracts data from the entropy source. * * \param ctx The CTR_DRBG context. * \param additional Additional data to add to the state. Can be NULL. * \param len The length of the additional data. * * \return \c 0 on success. * \return #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED on failure. */
int mbedtls_ctr_drbg_update_ret( mbedtls_ctr_drbg_context *ctx,
const unsigned char *additional,
size_t add_len );
/** * \brief This function updates the state of the CTR_DRBG context. * * \param ctx The CTR_DRBG context. * \param additional The data to update the state with. * \param add_len Length of \p additional in bytes. This must be at * most #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT. * * \return \c 0 on success. * \return #MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG if * \p add_len is more than * #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT. * \return An error from the underlying AES cipher on failure. */
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 );
/** * \brief This function updates a CTR_DRBG instance with additional * data and uses it to generate random data. * * \note The function automatically reseeds if the reseed counter is exceeded. * * \param p_rng The CTR_DRBG context. This must be a pointer to a * #mbedtls_ctr_drbg_context structure. * \param output The buffer to fill. * \param output_len The length of the buffer. * \param additional Additional data to update. Can be NULL. * \param add_len The length of the additional data. * * \return \c 0 on success. * \return #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED or * #MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG on failure. */
int mbedtls_ctr_drbg_random( void *p_rng,
unsigned char *output, size_t output_len );
/** * \brief This function uses CTR_DRBG to generate random data. * * \note The function automatically reseeds if the reseed counter is exceeded. * * \param p_rng The CTR_DRBG context. This must be a pointer to a * #mbedtls_ctr_drbg_context structure. * \param output The buffer to fill. * \param output_len The length of the buffer. * * \return \c 0 on success. * \return #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED or * #MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG on failure. */
int mbedtls_ctr_drbg_write_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path );
/** * \brief This function writes a seed file. * * \param ctx The CTR_DRBG context. * \param path The name of the file. * * \return \c 0 on success. * \return #MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR on file error. * \return #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED on * failure. */
int mbedtls_ctr_drbg_update_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path );
/** * \brief This function reads and updates a seed file. The seed * is added to this instance. * * \param ctx The CTR_DRBG context. * \param path The name of the file. * * \return \c 0 on success. * \return #MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR on file error. * \return #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED or * #MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG on failure. */
int mbedtls_ctr_drbg_self_test( int verbose );
/** * \brief The CTR_DRBG checkup routine. * * \return \c 0 on success. * \return \c 1 on failure. */
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 );
/* Internal functions (do not call directly) */
MBEDTLS_DEPRECATED void mbedtls_ctr_drbg_update(
mbedtls_ctr_drbg_context *ctx,
const unsigned char *additional,
size_t add_len );
/** * \brief This function updates the state of the CTR_DRBG context. * * \deprecated Superseded by mbedtls_ctr_drbg_update_ret() * in 2.16.0. * * \note If \p add_len is greater than * #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT, only the first * #MBEDTLS_CTR_DRBG_MAX_SEED_INPUT Bytes are used. * The remaining Bytes are silently discarded. * * \param ctx The CTR_DRBG context. * \param additional The data to update the state with. * \param add_len Length of \p additional data. */
typedef struct mbedtls_ctr_drbg_context
{
unsigned char counter[16]; /*!< The counter (V). */
int reseed_counter; /*!< The reseed counter. */
int prediction_resistance; /*!< This determines whether prediction
resistance is enabled, that is
whether to systematically reseed before
each random generation. */
size_t entropy_len; /*!< The amount of entropy grabbed on each
seed or reseed operation. */
int reseed_interval; /*!< The reseed interval. */
mbedtls_aes_context aes_ctx; /*!< The AES context. */
/*
* Callbacks (Entropy)
*/
int (*f_entropy)(void *, unsigned char *, size_t);
/*!< The entropy callback function. */
void *p_entropy; /*!< The context for the entropy function. */
#if defined(MBEDTLS_THREADING_C)
mbedtls_threading_mutex_t mutex;
#endif
}
mbedtls_ctr_drbg_context;
/** * \brief The CTR_DRBG context structure. */