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#include <stdio.h>
#include "prng.h"
static uint32_t current=0;
static uint32_t seed=0;
static uint32_t permute(uint32_t x)
{
static uint32_t prime = 4294967291U;
if(x>=prime) return x;
uint32_t residue = ((uint64_t)x*x)%prime;
if(x<=prime/2) return residue;
else return prime - residue;
}
void prng_init(uint32_t val)
{
current=0;
seed=val;
}
uint32_t prng_next(void)
{
current=permute((permute(current) + seed) ^ 0x5bf03635);
return current;
}
uint64_t prng_next64(void)
{
return (uint64_t)(prng_next())<<32|prng_next();
}
uint8_t *prng_md5sum(uint8_t checksum[])
{
uint8_t i=0;
uint8_t j=0;
uint32_t r;
while(i<MD5_DIGEST_LENGTH)
{
r=prng_next();
for(j=0; j<sizeof(r)*4; j+=8)
checksum[i++]=(uint8_t)(r>>j);
}
return checksum;
}
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