50 lines
817 B
C
50 lines
817 B
C
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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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uint8_t random_state[16];
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uint8_t random_key[16];
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uint8_t random8(void){
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static uint8_t sr[16];
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static uint8_t i=0;
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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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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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