85 lines
1.7 KiB
C
Executable File
85 lines
1.7 KiB
C
Executable File
#define _GNU_SOURCE
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#include <stdint.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <time.h>
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#include "includes.h"
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#include "rand.h"
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static uint32_t x, y, z, w;
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void rand_init(void)
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{
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x = time(NULL);
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y = getpid() ^ getppid();
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z = clock();
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w = z ^ y;
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}
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uint32_t rand_next(void) //period 2^96-1
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{
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uint32_t t = x;
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t ^= t << 11;
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t ^= t >> 8;
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x = y; y = z; z = w;
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w ^= w >> 19;
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w ^= t;
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return w;
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}
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void rand_str(char *str, int len) // Generate random buffer (not alphanumeric!) of length len
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{
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while (len > 0)
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{
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if (len >= 4)
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{
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*((uint32_t *)str) = rand_next();
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str += sizeof (uint32_t);
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len -= sizeof (uint32_t);
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}
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else if (len >= 2)
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{
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*((uint16_t *)str) = rand_next() & 0xFFFF;
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str += sizeof (uint16_t);
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len -= sizeof (uint16_t);
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}
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else
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{
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*str++ = rand_next() & 0xFF;
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len--;
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}
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}
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}
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void rand_alphastr(uint8_t *str, int len) // Random alphanumeric string, more expensive than rand_str
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{
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const char alphaset[] = "abcdefghijklmnopqrstuvw012345678";
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while (len > 0)
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{
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if (len >= sizeof (uint32_t))
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{
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int i;
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uint32_t entropy = rand_next();
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for (i = 0; i < sizeof (uint32_t); i++)
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{
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uint8_t tmp = entropy & 0xff;
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entropy = entropy >> 8;
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tmp = tmp >> 3;
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*str++ = alphaset[tmp];
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}
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len -= sizeof (uint32_t);
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}
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else
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{
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*str++ = rand_next() % (sizeof (alphaset));
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len--;
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}
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}
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}
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