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244 lines
7.4 KiB
C
244 lines
7.4 KiB
C
/**
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* \file entropy.h
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*
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* \brief Entropy accumulator implementation
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*
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* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
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*
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* This file is part of mbed TLS (https://polarssl.org)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_ENTROPY_H
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#define POLARSSL_ENTROPY_H
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#include <string.h>
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#if !defined(POLARSSL_CONFIG_FILE)
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#include "config.h"
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#else
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#include POLARSSL_CONFIG_FILE
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#endif
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#if defined(POLARSSL_SHA512_C) && !defined(POLARSSL_ENTROPY_FORCE_SHA256)
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#include "sha512.h"
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#define POLARSSL_ENTROPY_SHA512_ACCUMULATOR
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#else
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#if defined(POLARSSL_SHA256_C)
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#define POLARSSL_ENTROPY_SHA256_ACCUMULATOR
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#include "sha256.h"
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#endif
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#endif
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#if defined(POLARSSL_THREADING_C)
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#include "threading.h"
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#endif
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#if defined(POLARSSL_HAVEGE_C)
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#include "havege.h"
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#endif
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#define POLARSSL_ERR_ENTROPY_SOURCE_FAILED -0x003C /**< Critical entropy source failure. */
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#define POLARSSL_ERR_ENTROPY_MAX_SOURCES -0x003E /**< No more sources can be added. */
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#define POLARSSL_ERR_ENTROPY_NO_SOURCES_DEFINED -0x0040 /**< No sources have been added to poll. */
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#define POLARSSL_ERR_ENTROPY_FILE_IO_ERROR -0x0058 /**< Read/write error in file. */
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/**
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* \name SECTION: Module settings
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*
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* The configuration options you can set for this module are in this section.
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* Either change them in config.h or define them on the compiler command line.
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* \{
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*/
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#if !defined(ENTROPY_MAX_SOURCES)
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#define ENTROPY_MAX_SOURCES 20 /**< Maximum number of sources supported */
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#endif
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#if !defined(ENTROPY_MAX_GATHER)
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#define ENTROPY_MAX_GATHER 128 /**< Maximum amount requested from entropy sources */
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#endif
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/* \} name SECTION: Module settings */
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#if defined(POLARSSL_ENTROPY_SHA512_ACCUMULATOR)
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#define ENTROPY_BLOCK_SIZE 64 /**< Block size of entropy accumulator (SHA-512) */
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#else
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#define ENTROPY_BLOCK_SIZE 32 /**< Block size of entropy accumulator (SHA-256) */
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#endif
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#define ENTROPY_MAX_SEED_SIZE 1024 /**< Maximum size of seed we read from seed file */
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#define ENTROPY_SOURCE_MANUAL ENTROPY_MAX_SOURCES
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Entropy poll callback pointer
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*
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* \param data Callback-specific data pointer
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* \param output Data to fill
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* \param len Maximum size to provide
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* \param olen The actual amount of bytes put into the buffer (Can be 0)
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*
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* \return 0 if no critical failures occurred,
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* POLARSSL_ERR_ENTROPY_SOURCE_FAILED otherwise
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*/
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typedef int (*f_source_ptr)(void *data, unsigned char *output, size_t len,
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size_t *olen);
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/**
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* \brief Entropy source state
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*/
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typedef struct
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{
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f_source_ptr f_source; /**< The entropy source callback */
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void * p_source; /**< The callback data pointer */
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size_t size; /**< Amount received */
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size_t threshold; /**< Minimum level required before release */
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}
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source_state;
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/**
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* \brief Entropy context structure
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*/
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typedef struct
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{
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#if defined(POLARSSL_ENTROPY_SHA512_ACCUMULATOR)
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sha512_context accumulator;
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#else
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sha256_context accumulator;
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#endif
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int source_count;
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source_state source[ENTROPY_MAX_SOURCES];
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#if defined(POLARSSL_HAVEGE_C)
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havege_state havege_data;
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#endif
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#if defined(POLARSSL_THREADING_C)
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threading_mutex_t mutex; /*!< mutex */
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#endif
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}
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entropy_context;
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/**
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* \brief Initialize the context
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*
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* \param ctx Entropy context to initialize
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*/
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void entropy_init( entropy_context *ctx );
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/**
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* \brief Free the data in the context
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*
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* \param ctx Entropy context to free
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*/
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void entropy_free( entropy_context *ctx );
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/**
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* \brief Adds an entropy source to poll
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* (Thread-safe if POLARSSL_THREADING_C is enabled)
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*
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* \param ctx Entropy context
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* \param f_source Entropy function
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* \param p_source Function data
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* \param threshold Minimum required from source before entropy is released
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* ( with entropy_func() )
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*
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* \return 0 if successful or POLARSSL_ERR_ENTROPY_MAX_SOURCES
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*/
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int entropy_add_source( entropy_context *ctx,
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f_source_ptr f_source, void *p_source,
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size_t threshold );
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/**
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* \brief Trigger an extra gather poll for the accumulator
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* (Thread-safe if POLARSSL_THREADING_C is enabled)
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*
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* \param ctx Entropy context
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*
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* \return 0 if successful, or POLARSSL_ERR_ENTROPY_SOURCE_FAILED
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*/
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int entropy_gather( entropy_context *ctx );
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/**
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* \brief Retrieve entropy from the accumulator
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* (Maximum length: ENTROPY_BLOCK_SIZE)
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* (Thread-safe if POLARSSL_THREADING_C is enabled)
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*
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* \param data Entropy context
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* \param output Buffer to fill
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* \param len Number of bytes desired, must be at most ENTROPY_BLOCK_SIZE
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*
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* \return 0 if successful, or POLARSSL_ERR_ENTROPY_SOURCE_FAILED
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*/
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int entropy_func( void *data, unsigned char *output, size_t len );
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/**
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* \brief Add data to the accumulator manually
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* (Thread-safe if POLARSSL_THREADING_C is enabled)
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*
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* \param ctx Entropy context
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* \param data Data to add
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* \param len Length of data
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*
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* \return 0 if successful
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*/
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int entropy_update_manual( entropy_context *ctx,
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const unsigned char *data, size_t len );
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#if defined(POLARSSL_FS_IO)
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/**
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* \brief Write a seed file
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*
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* \param ctx Entropy context
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* \param path Name of the file
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*
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* \return 0 if successful,
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* POLARSSL_ERR_ENTROPY_FILE_IO_ERROR on file error, or
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* POLARSSL_ERR_ENTROPY_SOURCE_FAILED
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*/
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int entropy_write_seed_file( entropy_context *ctx, const char *path );
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/**
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* \brief Read and update a seed file. Seed is added to this
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* instance. No more than ENTROPY_MAX_SEED_SIZE bytes are
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* read from the seed file. The rest is ignored.
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*
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* \param ctx Entropy context
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* \param path Name of the file
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*
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* \return 0 if successful,
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* POLARSSL_ERR_ENTROPY_FILE_IO_ERROR on file error,
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* POLARSSL_ERR_ENTROPY_SOURCE_FAILED
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*/
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int entropy_update_seed_file( entropy_context *ctx, const char *path );
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#endif /* POLARSSL_FS_IO */
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#if defined(POLARSSL_SELF_TEST)
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/**
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* \brief Checkup routine
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*
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* \return 0 if successful, or 1 if a test failed
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*/
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int entropy_self_test( int verbose );
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#endif /* POLARSSL_SELF_TEST */
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#ifdef __cplusplus
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}
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#endif
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#endif /* entropy.h */
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