entropy.h

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#ifndef MBEDTLS_ENTROPY_H
#define MBEDTLS_ENTROPY_H

#if !defined(MBEDTLS_CONFIG_FILE)
#include "config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#include <stddef.h>

#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_ENTROPY_FORCE_SHA256)
#include "sha512.h"
#define MBEDTLS_ENTROPY_SHA512_ACCUMULATOR
#else
#if defined(MBEDTLS_SHA256_C)
#define MBEDTLS_ENTROPY_SHA256_ACCUMULATOR
#include "sha256.h"
#endif
#endif

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

#if defined(MBEDTLS_HAVEGE_C)
#include "havege.h"
#endif

#define MBEDTLS_ERR_ENTROPY_SOURCE_FAILED -0x003C 
#define MBEDTLS_ERR_ENTROPY_MAX_SOURCES -0x003E 
#define MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED -0x0040 
#define MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE -0x003D 
#define MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR -0x003F 
#if !defined(MBEDTLS_ENTROPY_MAX_SOURCES)
#define MBEDTLS_ENTROPY_MAX_SOURCES 20 
#endif

#if !defined(MBEDTLS_ENTROPY_MAX_GATHER)
#define MBEDTLS_ENTROPY_MAX_GATHER 128 
#endif

/* \} name SECTION: Module settings */

#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
#define MBEDTLS_ENTROPY_BLOCK_SIZE 64 
#else
#define MBEDTLS_ENTROPY_BLOCK_SIZE 32 
#endif

#define MBEDTLS_ENTROPY_MAX_SEED_SIZE 1024 
#define MBEDTLS_ENTROPY_SOURCE_MANUAL MBEDTLS_ENTROPY_MAX_SOURCES

#define MBEDTLS_ENTROPY_SOURCE_STRONG 1 
#define MBEDTLS_ENTROPY_SOURCE_WEAK 0 
#ifdef __cplusplus
extern "C" {
#endif

typedef int (*mbedtls_entropy_f_source_ptr)(void *data, unsigned char *output, size_t len,
 size_t *olen);

typedef struct
{
 mbedtls_entropy_f_source_ptr f_source; 
 void * p_source; 
 size_t size; 
 size_t threshold; 
 int strong; 
}
mbedtls_entropy_source_state;

typedef struct
{
#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
 mbedtls_sha512_context accumulator;
#else
 mbedtls_sha256_context accumulator;
#endif
 int source_count;
 mbedtls_entropy_source_state source[MBEDTLS_ENTROPY_MAX_SOURCES];
#if defined(MBEDTLS_HAVEGE_C)
 mbedtls_havege_state havege_data;
#endif
#if defined(MBEDTLS_THREADING_C)
 mbedtls_threading_mutex_t mutex; 
#endif
#if defined(MBEDTLS_ENTROPY_NV_SEED)
 int initial_entropy_run;
#endif
}
mbedtls_entropy_context;

void mbedtls_entropy_init( mbedtls_entropy_context *ctx );

void mbedtls_entropy_free( mbedtls_entropy_context *ctx );

int mbedtls_entropy_add_source( mbedtls_entropy_context *ctx,
 mbedtls_entropy_f_source_ptr f_source, void *p_source,
 size_t threshold, int strong );

int mbedtls_entropy_gather( mbedtls_entropy_context *ctx );

int mbedtls_entropy_func( void *data, unsigned char *output, size_t len );

int mbedtls_entropy_update_manual( mbedtls_entropy_context *ctx,
 const unsigned char *data, size_t len );

#if defined(MBEDTLS_ENTROPY_NV_SEED)

int mbedtls_entropy_update_nv_seed( mbedtls_entropy_context *ctx );
#endif /* MBEDTLS_ENTROPY_NV_SEED */

#if defined(MBEDTLS_FS_IO)

int mbedtls_entropy_write_seed_file( mbedtls_entropy_context *ctx, const char *path );

int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *path );
#endif /* MBEDTLS_FS_IO */

#if defined(MBEDTLS_SELF_TEST)

int mbedtls_entropy_self_test( int verbose );

#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)

int mbedtls_entropy_source_self_test( int verbose );
#endif /* MBEDTLS_ENTROPY_HARDWARE_ALT */
#endif /* MBEDTLS_SELF_TEST */

#ifdef __cplusplus
}
#endif

#endif /* entropy.h */