68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/* noekeon_prng.c */
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/*
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* This file is part of the AVR-Crypto-Lib.
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* Copyright (C) 2006, 2007, 2008 Daniel Otte (daniel.otte@rub.de)
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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 3 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \author Daniel Otte
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* \date 2008-08-24
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* \license GPLv3 or later
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* \brief random number generator based on noekeon running in CFB-mode
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*
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*/
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#include "noekeon.h"
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#include "memxor.h"
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#include <stdint.h>
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#include <string.h>
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static uint8_t random_state[16];
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static uint8_t random_key[16];
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static uint8_t i=0;
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uint8_t random8(void){
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static uint8_t sr[16];
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if(i==0){
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noekeon_enc(random_state, random_key);
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memcpy(sr, random_state, 16);
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i=15;
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return sr[15];
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}
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--i;
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return sr[i];
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}
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void random_block(void* dest){
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i=0;
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noekeon_enc(random_state, random_key);
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memcpy(dest, random_state, 16);
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}
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void srandom32(uint32_t seed){
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memcpy(random_key, &seed, 4);
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}
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void random_seed(const void* buffer){
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memcpy(random_key, buffer, 16);
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}
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void random_add(const void* buffer){
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memxor(random_key, buffer, 16);
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}
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