mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-12-23 20:15:31 +00:00
243 lines
9 KiB
C
243 lines
9 KiB
C
/**
|
|
* \file ctr_drbg.h
|
|
*
|
|
* \brief CTR_DRBG based on AES-256 (NIST SP 800-90)
|
|
*
|
|
* Copyright (C) 2006-2013, Brainspark B.V.
|
|
*
|
|
* This file is part of PolarSSL (http://www.polarssl.org)
|
|
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
#ifndef POLARSSL_CTR_DRBG_H
|
|
#define POLARSSL_CTR_DRBG_H
|
|
|
|
#include <string.h>
|
|
|
|
#include "aes.h"
|
|
|
|
#define POLARSSL_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED -0x0034 /**< The entropy source failed. */
|
|
#define POLARSSL_ERR_CTR_DRBG_REQUEST_TOO_BIG -0x0036 /**< Too many random requested in single call. */
|
|
#define POLARSSL_ERR_CTR_DRBG_INPUT_TOO_BIG -0x0038 /**< Input too large (Entropy + additional). */
|
|
#define POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR -0x003A /**< Read/write error in file. */
|
|
|
|
#define CTR_DRBG_BLOCKSIZE 16 /**< Block size used by the cipher */
|
|
#define CTR_DRBG_KEYSIZE 32 /**< Key size used by the cipher */
|
|
#define CTR_DRBG_KEYBITS ( CTR_DRBG_KEYSIZE * 8 )
|
|
#define CTR_DRBG_SEEDLEN ( CTR_DRBG_KEYSIZE + CTR_DRBG_BLOCKSIZE )
|
|
/**< The seed length (counter + AES key) */
|
|
|
|
#if !defined(POLARSSL_CONFIG_OPTIONS)
|
|
#if defined(POLARSSL_SHA512_C) && !defined(POLARSSL_ENTROPY_FORCE_SHA256)
|
|
#define CTR_DRBG_ENTROPY_LEN 48 /**< Amount of entropy used per seed by default (48 with SHA-512, 32 with SHA-256) */
|
|
#else
|
|
#define CTR_DRBG_ENTROPY_LEN 32 /**< Amount of entropy used per seed by default (48 with SHA-512, 32 with SHA-256) */
|
|
#endif
|
|
#define CTR_DRBG_RESEED_INTERVAL 10000 /**< Interval before reseed is performed by default */
|
|
#define CTR_DRBG_MAX_INPUT 256 /**< Maximum number of additional input bytes */
|
|
#define CTR_DRBG_MAX_REQUEST 1024 /**< Maximum number of requested bytes per call */
|
|
#define CTR_DRBG_MAX_SEED_INPUT 384 /**< Maximum size of (re)seed buffer */
|
|
#endif /* !POLARSSL_CONFIG_OPTIONS */
|
|
|
|
#define CTR_DRBG_PR_OFF 0 /**< No prediction resistance */
|
|
#define CTR_DRBG_PR_ON 1 /**< Prediction resistance enabled */
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* \brief CTR_DRBG context structure
|
|
*/
|
|
typedef struct
|
|
{
|
|
unsigned char counter[16]; /*!< counter (V) */
|
|
int reseed_counter; /*!< reseed counter */
|
|
int prediction_resistance; /*!< enable prediction resistance (Automatic
|
|
reseed before every random generation) */
|
|
size_t entropy_len; /*!< amount of entropy grabbed on each (re)seed */
|
|
int reseed_interval; /*!< reseed interval */
|
|
|
|
aes_context aes_ctx; /*!< AES context */
|
|
|
|
/*
|
|
* Callbacks (Entropy)
|
|
*/
|
|
int (*f_entropy)(void *, unsigned char *, size_t);
|
|
|
|
void *p_entropy; /*!< context for the entropy function */
|
|
}
|
|
ctr_drbg_context;
|
|
|
|
/**
|
|
* \brief CTR_DRBG initialization
|
|
*
|
|
* Note: Personalization data can be provided in addition to the more generic
|
|
* entropy source to make this instantiation as unique as possible.
|
|
*
|
|
* \param ctx CTR_DRBG context to be initialized
|
|
* \param f_entropy Entropy callback (p_entropy, buffer to fill, buffer
|
|
* length)
|
|
* \param p_entropy Entropy context
|
|
* \param custom Personalization data (Device specific identifiers)
|
|
* (Can be NULL)
|
|
* \param len Length of personalization data
|
|
*
|
|
* \return 0 if successful, or
|
|
* POLARSSL_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED
|
|
*/
|
|
int ctr_drbg_init( ctr_drbg_context *ctx,
|
|
int (*f_entropy)(void *, unsigned char *, size_t),
|
|
void *p_entropy,
|
|
const unsigned char *custom,
|
|
size_t len );
|
|
|
|
/**
|
|
* \brief Enable / disable prediction resistance (Default: Off)
|
|
*
|
|
* Note: If enabled, entropy is used for ctx->entropy_len before each call!
|
|
* Only use this if you have ample supply of good entropy!
|
|
*
|
|
* \param ctx CTR_DRBG context
|
|
* \param resistance CTR_DRBG_PR_ON or CTR_DRBG_PR_OFF
|
|
*/
|
|
void ctr_drbg_set_prediction_resistance( ctr_drbg_context *ctx,
|
|
int resistance );
|
|
|
|
/**
|
|
* \brief Set the amount of entropy grabbed on each (re)seed
|
|
* (Default: CTR_DRBG_ENTROPY_LEN)
|
|
*
|
|
* \param ctx CTR_DRBG context
|
|
* \param len Amount of entropy to grab
|
|
*/
|
|
void ctr_drbg_set_entropy_len( ctr_drbg_context *ctx,
|
|
size_t len );
|
|
|
|
/**
|
|
* \brief Set the reseed interval
|
|
* (Default: CTR_DRBG_RESEED_INTERVAL)
|
|
*
|
|
* \param ctx CTR_DRBG context
|
|
* \param interval Reseed interval
|
|
*/
|
|
void ctr_drbg_set_reseed_interval( ctr_drbg_context *ctx,
|
|
int interval );
|
|
|
|
/**
|
|
* \brief CTR_DRBG reseeding (extracts data from entropy source)
|
|
*
|
|
* \param ctx CTR_DRBG context
|
|
* \param additional Additional data to add to state (Can be NULL)
|
|
* \param len Length of additional data
|
|
*
|
|
* \return 0 if successful, or
|
|
* POLARSSL_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED
|
|
*/
|
|
int ctr_drbg_reseed( ctr_drbg_context *ctx,
|
|
const unsigned char *additional, size_t len );
|
|
|
|
/**
|
|
* \brief CTR_DRBG update state
|
|
*
|
|
* \param ctx CTR_DRBG context
|
|
* \param additional Additional data to update state with
|
|
* \param add_len Length of additional data
|
|
*/
|
|
void ctr_drbg_update( ctr_drbg_context *ctx,
|
|
const unsigned char *additional, size_t add_len );
|
|
|
|
/**
|
|
* \brief CTR_DRBG generate random with additional update input
|
|
*
|
|
* Note: Automatically reseeds if reseed_counter is reached.
|
|
*
|
|
* \param p_rng CTR_DRBG context
|
|
* \param output Buffer to fill
|
|
* \param output_len Length of the buffer
|
|
* \param additional Additional data to update with (Can be NULL)
|
|
* \param add_len Length of additional data
|
|
*
|
|
* \return 0 if successful, or
|
|
* POLARSSL_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED, or
|
|
* POLARSSL_ERR_CTR_DRBG_REQUEST_TOO_BIG
|
|
*/
|
|
int ctr_drbg_random_with_add( void *p_rng,
|
|
unsigned char *output, size_t output_len,
|
|
const unsigned char *additional, size_t add_len );
|
|
|
|
/**
|
|
* \brief CTR_DRBG generate random
|
|
*
|
|
* Note: Automatically reseeds if reseed_counter is reached.
|
|
*
|
|
* \param p_rng CTR_DRBG context
|
|
* \param output Buffer to fill
|
|
* \param output_len Length of the buffer
|
|
*
|
|
* \return 0 if successful, or
|
|
* POLARSSL_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED, or
|
|
* POLARSSL_ERR_CTR_DRBG_REQUEST_TOO_BIG
|
|
*/
|
|
int ctr_drbg_random( void *p_rng,
|
|
unsigned char *output, size_t output_len );
|
|
|
|
#if defined(POLARSSL_FS_IO)
|
|
/**
|
|
* \brief Write a seed file
|
|
*
|
|
* \param ctx CTR_DRBG context
|
|
* \param path Name of the file
|
|
*
|
|
* \return 0 if successful,
|
|
* POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR on file error, or
|
|
* POLARSSL_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED
|
|
*/
|
|
int ctr_drbg_write_seed_file( ctr_drbg_context *ctx, const char *path );
|
|
|
|
/**
|
|
* \brief Read and update a seed file. Seed is added to this
|
|
* instance
|
|
*
|
|
* \param ctx CTR_DRBG context
|
|
* \param path Name of the file
|
|
*
|
|
* \return 0 if successful,
|
|
* POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR on file error,
|
|
* POLARSSL_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED or
|
|
* POLARSSL_ERR_CTR_DRBG_INPUT_TOO_BIG
|
|
*/
|
|
int ctr_drbg_update_seed_file( ctr_drbg_context *ctx, const char *path );
|
|
#endif
|
|
|
|
/**
|
|
* \brief Checkup routine
|
|
*
|
|
* \return 0 if successful, or 1 if the test failed
|
|
*/
|
|
int ctr_drbg_self_test( int verbose );
|
|
|
|
/* Internal functions (do not call directly) */
|
|
int ctr_drbg_init_entropy_len( ctr_drbg_context *, int (*)(void *, unsigned char *, size_t), void *, const unsigned char *, size_t, size_t );
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* ctr_drbg.h */
|