borgware-2d/random/prng.h

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/**
* \author Daniel Otte
* \date 2008-08-24
* \license GPLv3 or later
* \brief random number generator based on noekeon running in CFB-mode
*
*/
#ifndef PRNG_H_
#define PRNG_H_
#include <stdint.h>
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#include "string.h"
#include "noekeon.h"
#include "memxor.h"
extern uint8_t random_state[16];
extern uint8_t random_key[16];
uint8_t random8(void);
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inline static void random_block(void* dest){
noekeon_enc(random_state, random_key);
memcpy(dest, random_state, 16);
}
inline static void srandom32(uint32_t seed){
memcpy(random_key, &seed, 4);
}
inline static void random_seed(const void* buffer){
memcpy(random_key, buffer, 16);
}
inline static void random_add(const void* buffer){
memxor(random_key, buffer, 16);
}
#endif /* PRNG_H_*/