57 lines
923 B
C
57 lines
923 B
C
/************************************************************//**
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*
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* @file: unix_rng.c
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* @author: Martin Fouilleul
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* @date: 06/03/2020
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* @revision:
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*
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*****************************************************************/
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#include<stdio.h>
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#include<stdlib.h>
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#include"platform_log.h"
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#include"typedefs.h"
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int RandomSeedFromDevice()
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{
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FILE* urandom = fopen("/dev/urandom", "r");
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if(!urandom)
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{
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log_error("can't open /dev/urandom\n");
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return(-1);
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}
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union
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{
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u32 u;
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char buff[4];
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} seed;
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int size = fread(seed.buff, 1, 4, urandom);
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if(size != 4)
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{
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log_error("couldn't read from /dev/urandom\n");
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return(-1);
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}
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fclose(urandom);
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srandom(seed.u);
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return(0);
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}
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u32 RandomU32()
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{
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u32 u1 = (u32)random();
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u32 u2 = (u32)random();
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return((u1<<1) | (u2 & 0x01));
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}
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u64 RandomU64()
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{
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u64 u1 = (u64)random();
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u64 u2 = (u64)random();
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u64 u3 = (u64)random();
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return((u1<<33) | (u2<<2) | (u3 & 0x03));
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}
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