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Support for seed file writing and reading in Entropy

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This commit is contained in:
Paul Bakker 2014-03-26 11:54:05 +01:00
parent 766a5d0206
commit 66ff70dd48
5 changed files with 94 additions and 0 deletions
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30
include/polarssl/entropy.h
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@ -52,6 +52,7 @@
#define POLARSSL_ERR_ENTROPY_SOURCE_FAILED -0x003C /**< Critical entropy source failure. */
#define POLARSSL_ERR_ENTROPY_MAX_SOURCES -0x003E /**< No more sources can be added. */
#define POLARSSL_ERR_ENTROPY_NO_SOURCES_DEFINED -0x0040 /**< No sources have been added to poll. */
#define POLARSSL_ERR_ENTROPY_FILE_IO_ERROR -0x0058 /**< Read/write error in file. */
#if !defined(POLARSSL_CONFIG_OPTIONS)
#define ENTROPY_MAX_SOURCES 20 /**< Maximum number of sources supported */
@ -64,6 +65,7 @@
#define ENTROPY_BLOCK_SIZE 32 /**< Block size of entropy accumulator (SHA-256) */
#endif
#define ENTROPY_MAX_SEED_SIZE 1024 /**< Maximum size of seed we read from seed file */
#define ENTROPY_SOURCE_MANUAL ENTROPY_MAX_SOURCES
#ifdef __cplusplus
@ -182,6 +184,34 @@ int entropy_func( void *data, unsigned char *output, size_t len );
int entropy_update_manual( entropy_context *ctx,
const unsigned char *data, size_t len );
#if defined(POLARSSL_FS_IO)
/**
* \brief Write a seed file
*
* \param ctx Entropy context
* \param path Name of the file
*
* \return 0 if successful,
* POLARSSL_ERR_ENTROPY_FILE_IO_ERROR on file error, or
* POLARSSL_ERR_ENTROPY_SOURCE_FAILED
*/
int entropy_write_seed_file( entropy_context *ctx, const char *path );
/**
* \brief Read and update a seed file. Seed is added to this
* instance. No more than ENTROPY_MAX_SEED_SIZE bytes are
* read from the seed file. The rest is ignored.
*
* \param ctx Entropy context
* \param path Name of the file
*
* \return 0 if successful,
* POLARSSL_ERR_ENTROPY_FILE_IO_ERROR on file error,
* POLARSSL_ERR_ENTROPY_SOURCE_FAILED
*/
int entropy_update_seed_file( entropy_context *ctx, const char *path );
#endif
#ifdef __cplusplus
}
#endif