49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
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/* vi: set sw=4 ts=4: */
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/*
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* crypt_make_salt
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*
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* i64c was also put here, this is the only function that uses it.
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*
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* Lifted from loginutils/passwd.c by Thomas Lundquist <thomasez@zelow.no>
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*
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*/
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#include "libbb.h"
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static int i64c(int i)
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{
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i &= 0x3f;
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if (i == 0)
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return '.';
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if (i == 1)
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return '/';
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if (i < 12)
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return ('0' - 2 + i);
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if (i < 38)
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return ('A' - 12 + i);
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return ('a' - 38 + i);
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}
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void crypt_make_salt(char *p, int cnt)
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{
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unsigned x = x; /* it's pointless to initialize it anyway :) */
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x += getpid() + time(NULL) + clock();
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do {
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/* x = (x*1664525 + 1013904223) % 2^32 generator is lame
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* (low-order bit is not "random", etc...),
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* but for our purposes it is good enough */
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x = x*1664525 + 1013904223;
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/* BTW, Park and Miller's "minimal standard generator" is
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* x = x*16807 % ((2^31)-1)
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* It has no problem with visibly alternating lowest bit
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* but is also weak in cryptographic sense + needs div,
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* which needs more code (and slower) on many CPUs */
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*p++ = i64c(x >> 16);
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*p++ = i64c(x >> 22);
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} while (--cnt);
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*p = '\0';
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}
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