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passwd: added comment

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This commit is contained in:
Denis Vlasenko 2006-12-12 17:14:56 +00:00
parent 900406c359
commit db2b52425d
1 changed files with 6 additions and 1 deletions
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7
loginutils/passwd.c
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@ -34,10 +34,15 @@ static void crypt_make_salt(char *p, int cnt)
x += getpid() + time(NULL) + clock(); x += getpid() + time(NULL) + clock();
do { do {
/* x = (x*1664525 + 1013904223) mod 2^32 generator is lame /* x = (x*1664525 + 1013904223) % 2^32 generator is lame
* (low-order bit is not "random", etc...), * (low-order bit is not "random", etc...),
* but for our purposes it is good enough */ * but for our purposes it is good enough */
x = x*1664525 + 1013904223; x = x*1664525 + 1013904223;
/* BTW, Park and Miller's "minimal standard generator" is
* x = x*16807 % ((2^31)-1)
* It has no problem with visibly alternating lowest bit
* but is also weak in cryptographic sense + needs div,
* which needs more code (and slower) on many CPUs */
*p++ = i64c(x >> 16); *p++ = i64c(x >> 16);
*p++ = i64c(x >> 22); *p++ = i64c(x >> 22);
} while (--cnt); } while (--cnt);