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libbb: move crypt_make_salt() to pw_encrypt.c, reuse

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bin-to-ascii64 conversion which does not require an array.

function                                             old     new   delta
to64                                                  29      33      +4
to64_msb_first                                        63      62      -1
ascii64                                               65       -     -65
This commit is contained in:
Denis Vlasenko
2008-12-07 01:16:34 +00:00
parent db12d1d733
commit d1a84a2880
4 changed files with 60 additions and 63 deletions
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63
libbb/pw_encrypt.c
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@ -1,6 +1,6 @@
/* vi: set sw=4 ts=4: */
/*
* Utility routine.
* Utility routines.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
@ -9,25 +9,62 @@
#include "libbb.h"
/* static const uint8_t ascii64[] =
* "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
*/
static int i64c(int i)
{
i &= 0x3f;
if (i == 0)
return '.';
if (i == 1)
return '/';
if (i < 12)
return ('0' - 2 + i);
if (i < 38)
return ('A' - 12 + i);
return ('a' - 38 + i);
}
int FAST_FUNC crypt_make_salt(char *p, int cnt, int x)
{
x += getpid() + time(NULL);
do {
/* x = (x*1664525 + 1013904223) % 2^32 generator is lame
* (low-order bit is not "random", etc...),
* but for our purposes it is good enough */
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 >> 22);
} while (--cnt);
*p = '\0';
return x;
}
#if ENABLE_USE_BB_CRYPT
static char*
to64(char *s, unsigned v, int n)
{
while (--n >= 0) {
/* *s++ = ascii64[v & 0x3f]; */
*s++ = i64c(v);
v >>= 6;
}
return s;
}
/*
* DES and MD5 crypt implementations are taken from uclibc.
* They were modified to not use static buffers.
*/
/* Used by pw_encrypt_XXX.c */
static const uint8_t ascii64[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
static char*
to64(char *s, unsigned v, int n)
{
while (--n >= 0) {
*s++ = ascii64[v & 0x3f];
v >>= 6;
}
return s;
}
#include "pw_encrypt_des.c"
#include "pw_encrypt_md5.c"
#if ENABLE_USE_BB_CRYPT_SHA