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
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-
Property svn:eol-style
set to
native
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File size:
1.0 KB
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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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