#if !defined(ECL_MS_WINDOWS_HOST)
/* fopen() might read full 4kB blocks and discard
* a lot of entropy, so use open() */
- int fh = open("/dev/urandom", O_RDONLY);
- char buffer[16];
- if (fh != -1) {
- j = read(fh, buffer, sizeof(buffer));
- for (; j < sizeof(buffer) && j < MT_N; j++){
- mt[j] = buffer[j];
- }
+ int file_handler = open("/dev/urandom", O_RDONLY);
+ if (file_handler != -1) {
+ read(file_handler, mt, sizeof(ulong));
close(fh);
} else
#endif
{
/* cant get urandom, use crappy source */
/* and/or fill rest of area */
- mt[j++] = (rand() + time(0)) & 0xffffffffUL;
- for (; j < MT_N; j++){
- mt[j] = (1812433253UL * (mt[j-1] ^ (mt[j-1] >> 30)) + j);
- if (j >= 16)
- mt[j] ^= mt[j-16];
- mt[j] &= 0xffffffffUL;
- }
+ mt[0] = (rand() + time(0));
}
+ mt[0] &= 0xffffffffUL;
+ for (j=1; j < MT_N; j++)
+ mt[j] = (1812433253UL * (mt[j-1] ^ (mt[j-1] >> 30)) + j) & 0xffffffffUL;
+
mt[MT_N] = MT_N+1;
return a;
}
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