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https://github.com/dolphin-emu/dolphin.git
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a48e284317
There were some fixes back on March 13th, 2014 for fixing compiling on MIPS64. Also some fixes on June 25th, 2014 for SPARC64 fixes. Probably more things, but those are what I care about.
246 lines
7.4 KiB
C
246 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, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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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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