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/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include <crypt.h>
#include "libbb.h"
/* static const uint8_t ascii64[] ALIGN1 =
* "./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 */)
{
/* was: x += ... */
unsigned x = getpid() + monotonic_us();
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;
}
char* FAST_FUNC crypt_make_pw_salt(char salt[MAX_PW_SALT_LEN], const char *algo)
{
int len = 2/2;
char *salt_ptr = salt;
/* Standard chpasswd uses uppercase algos ("MD5", not "md5").
* Need to be case-insensitive in the code below.
*/
if ((algo[0]|0x20) != 'd') { /* not des */
len = 8/2; /* so far assuming md5 */
*salt_ptr++ = '$';
*salt_ptr++ = '1';
*salt_ptr++ = '$';
#if !ENABLE_USE_BB_CRYPT || ENABLE_USE_BB_CRYPT_SHA
if ((algo[0]|0x20) == 's') { /* sha */
salt[1] = '5' + (strcasecmp(algo, "sha512") == 0);
len = 16/2;
}
#endif
}
crypt_make_salt(salt_ptr, len);
return salt_ptr;
}
#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.
*/
#include "pw_encrypt_des.c"
#include "pw_encrypt_md5.c"
#if ENABLE_USE_BB_CRYPT_SHA
#include "pw_encrypt_sha.c"
#endif
/* Other advanced crypt ids (TODO?): */
/* $2$ or $2a$: Blowfish */
static struct const_des_ctx *des_cctx;
static struct des_ctx *des_ctx;
/* my_crypt returns malloc'ed data */
static char *my_crypt(const char *key, const char *salt)
{
/* MD5 or SHA? */
if (salt[0] == '$' && salt[1] && salt[2] == '$') {
if (salt[1] == '1')
return md5_crypt(xzalloc(MD5_OUT_BUFSIZE), (unsigned char*)key, (unsigned char*)salt);
#if ENABLE_USE_BB_CRYPT_SHA
if (salt[1] == '5' || salt[1] == '6')
return sha_crypt((char*)key, (char*)salt);
#endif
}
if (!des_cctx)
des_cctx = const_des_init();
des_ctx = des_init(des_ctx, des_cctx);
return des_crypt(des_ctx, xzalloc(DES_OUT_BUFSIZE), (unsigned char*)key, (unsigned char*)salt);
}
/* So far nobody wants to have it public */
static void my_crypt_cleanup(void)
{
free(des_cctx);
free(des_ctx);
des_cctx = NULL;
des_ctx = NULL;
}
char* FAST_FUNC pw_encrypt(const char *clear, const char *salt, int cleanup)
{
char *encrypted;
encrypted = my_crypt(clear, salt);
if (cleanup)
my_crypt_cleanup();
return encrypted;
}
#else /* if !ENABLE_USE_BB_CRYPT */
char* FAST_FUNC pw_encrypt(const char *clear, const char *salt, int cleanup)
{
char *s;
s = crypt(clear, salt);
/*
* glibc used to return "" on malformed salts (for example, ""),
* but since 2.17 it returns NULL.
*/
return xstrdup(s ? s : "");
}
#endif
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