mango/util/random.c

#include <kernel/util.h>

static unsigned int random_seed = 53455346;

bool fill_random(void *p, unsigned int size)
{
	unsigned char *buffer = p;

	if (!buffer || !size) {
		return false;
	}

	for (uint32_t i = 0; i < size; i++) {
		uint32_t next = random_seed;
		uint32_t result;

		next *= 1103515245;
		next += 12345;
		result = (uint32_t)(next / 65536) % 2048;

		next *= 1103515245;
		next += 12345;
		result <<= 10;
		result ^= (uint32_t)(next / 65536) % 1024;

		next *= 1103515245;
		next += 12345;
		result <<= 10;
		result ^= (uint32_t)(next / 65536) % 1024;
		random_seed = next;

		buffer[i] = (uint8_t)(result % 256);
	}

	return true;
}