Last change
on this file since 3531 was 3320, checked in by Bruno Cornec, 10 years ago |
- Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in
the move to 3.0
|
-
Property svn:eol-style
set to
native
|
File size:
1.0 KB
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Rev | Line | |
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[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * crypt_make_salt
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| 4 | *
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| 5 | * i64c was also put here, this is the only function that uses it.
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| 6 | *
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| 7 | * Lifted from loginutils/passwd.c by Thomas Lundquist <thomasez@zelow.no>
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| 8 | *
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| 9 | */
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| 10 |
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| 11 | #include "libbb.h"
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| 12 |
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| 13 | static int i64c(int i)
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| 14 | {
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| 15 | i &= 0x3f;
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| 16 | if (i == 0)
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| 17 | return '.';
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| 18 | if (i == 1)
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| 19 | return '/';
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| 20 | if (i < 12)
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| 21 | return ('0' - 2 + i);
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| 22 | if (i < 38)
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| 23 | return ('A' - 12 + i);
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| 24 | return ('a' - 38 + i);
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| 25 | }
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| 26 |
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| 27 | int crypt_make_salt(char *p, int cnt, int x)
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| 28 | {
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| 29 | x += getpid() + time(NULL);
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| 30 | do {
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| 31 | /* x = (x*1664525 + 1013904223) % 2^32 generator is lame
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| 32 | * (low-order bit is not "random", etc...),
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| 33 | * but for our purposes it is good enough */
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| 34 | x = x*1664525 + 1013904223;
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| 35 | /* BTW, Park and Miller's "minimal standard generator" is
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| 36 | * x = x*16807 % ((2^31)-1)
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| 37 | * It has no problem with visibly alternating lowest bit
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| 38 | * but is also weak in cryptographic sense + needs div,
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| 39 | * which needs more code (and slower) on many CPUs */
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| 40 | *p++ = i64c(x >> 16);
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| 41 | *p++ = i64c(x >> 22);
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| 42 | } while (--cnt);
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| 43 | *p = '\0';
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| 44 | return x;
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| 45 | }
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