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-/**
- * \file ctr_drbg.h
- *
- * \brief CTR_DRBG based on AES-256 (NIST SP 800-90)
- *
- * Copyright (C) 2006-2010, 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) */
-#define CTR_DRBG_ENTROPY_LEN 48 /**< Amount of entropy used per seed by default */
-#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 */
-
-#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 path Name of the file
- *
- * \return 0 if successful, 1 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 path Name of the file
- *
- * \return 0 if successful, 1 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 );
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* ctr_drbg.h */