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freebsd-dev/secure/lib/libcrypt/crypt-des.c
Ed Schouten 5f521d7ba7 Make libcrypt thread-safe. Add crypt_r(3). 
glibc has a pretty nice function called crypt_r(3), which is nothing
more than crypt(3), but thread-safe. It accomplishes this by introducing
a 'struct crypt_data' structure that contains a buffer that is large
enough to hold the resulting string.

Let's go ahead and also add this function. It would be a shame if a
useful function like this wouldn't be usable in multithreaded apps.
Refactor crypt.c and all of the backends to no longer declare static
arrays, but write their output in a provided buffer.

There is no need to do any buffer length computation here, as we'll just
need to ensure that 'struct crypt_data' is large enough, which it is.
_PASSWORD_LEN is defined to 128 bytes, but in this case I'm picking 256,
as this is going to be part of the actual ABI.

Differential Revision:	https://reviews.freebsd.org/D7306
2016-08-10 15:16:28 +00:00

692 lines
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/*
* FreeSec: libcrypt for NetBSD
*
* Copyright (c) 1994 David Burren
* All rights reserved.
*
* Adapted for FreeBSD-2.0 by Geoffrey M. Rehmet
* this file should now *only* export crypt(), in order to make
* binaries of libcrypt exportable from the USA
*
* Adapted for FreeBSD-4.0 by Mark R V Murray
* this file should now *only* export crypt_des(), in order to make
* a module that can be optionally included in libcrypt.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of other contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This is an original implementation of the DES and the crypt(3) interfaces
* by David Burren <davidb@werj.com.au>.
*
* An excellent reference on the underlying algorithm (and related
* algorithms) is:
*
* B. Schneier, Applied Cryptography: protocols, algorithms,
* and source code in C, John Wiley & Sons, 1994.
*
* Note that in that book's description of DES the lookups for the initial,
* pbox, and final permutations are inverted (this has been brought to the
* attention of the author). A list of errata for this book has been
* posted to the sci.crypt newsgroup by the author and is available for FTP.
*
* ARCHITECTURE ASSUMPTIONS:
* It is assumed that the 8-byte arrays passed by reference can be
* addressed as arrays of u_int32_t's (ie. the CPU is not picky about
* alignment).
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/param.h>
#include <arpa/inet.h>
#include <pwd.h>
#include <string.h>
#include "crypt.h"
/* We can't always assume gcc */
#if defined(__GNUC__) && !defined(lint)
#define INLINE inline
#else
#define INLINE
#endif
static u_char IP[64] = {
58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8,
57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7
};
static u_char inv_key_perm[64];
static u_char key_perm[56] = {
57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36,
63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4
};
static u_char key_shifts[16] = {
1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
};
static u_char inv_comp_perm[56];
static u_char comp_perm[48] = {
14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,
44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
};
/*
* No E box is used, as it's replaced by some ANDs, shifts, and ORs.
*/
static u_char u_sbox[8][64];
static u_char sbox[8][64] = {
{
14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13
},
{
15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9
},
{
10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12
},
{
7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14
},
{
2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3
},
{
12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13
},
{
4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12
},
{
13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
}
};
static u_char un_pbox[32];
static u_char pbox[32] = {
16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10,
2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25
};
static u_int32_t bits32[32] =
{
0x80000000, 0x40000000, 0x20000000, 0x10000000,
0x08000000, 0x04000000, 0x02000000, 0x01000000,
0x00800000, 0x00400000, 0x00200000, 0x00100000,
0x00080000, 0x00040000, 0x00020000, 0x00010000,
0x00008000, 0x00004000, 0x00002000, 0x00001000,
0x00000800, 0x00000400, 0x00000200, 0x00000100,
0x00000080, 0x00000040, 0x00000020, 0x00000010,
0x00000008, 0x00000004, 0x00000002, 0x00000001
};
static u_char bits8[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
static u_int32_t saltbits;
static u_int32_t old_salt;
static u_int32_t *bits28, *bits24;
static u_char init_perm[64], final_perm[64];
static u_int32_t en_keysl[16], en_keysr[16];
static u_int32_t de_keysl[16], de_keysr[16];
static int des_initialised = 0;
static u_char m_sbox[4][4096];
static u_int32_t psbox[4][256];
static u_int32_t ip_maskl[8][256], ip_maskr[8][256];
static u_int32_t fp_maskl[8][256], fp_maskr[8][256];
static u_int32_t key_perm_maskl[8][128], key_perm_maskr[8][128];
static u_int32_t comp_maskl[8][128], comp_maskr[8][128];
static u_int32_t old_rawkey0, old_rawkey1;
static u_char ascii64[] =
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
/* 0000000000111111111122222222223333333333444444444455555555556666 */
/* 0123456789012345678901234567890123456789012345678901234567890123 */
static INLINE int
ascii_to_bin(char ch)
{
if (ch > 'z')
return(0);
if (ch >= 'a')
return(ch - 'a' + 38);
if (ch > 'Z')
return(0);
if (ch >= 'A')
return(ch - 'A' + 12);
if (ch > '9')
return(0);
if (ch >= '.')
return(ch - '.');
return(0);
}
static void
des_init(void)
{
int i, j, b, k, inbit, obit;
u_int32_t *p, *il, *ir, *fl, *fr;
old_rawkey0 = old_rawkey1 = 0L;
saltbits = 0L;
old_salt = 0L;
bits24 = (bits28 = bits32 + 4) + 4;
/*
* Invert the S-boxes, reordering the input bits.
*/
for (i = 0; i < 8; i++)
for (j = 0; j < 64; j++) {
b = (j & 0x20) | ((j & 1) << 4) | ((j >> 1) & 0xf);
u_sbox[i][j] = sbox[i][b];
}
/*
* Convert the inverted S-boxes into 4 arrays of 8 bits.
* Each will handle 12 bits of the S-box input.
*/
for (b = 0; b < 4; b++)
for (i = 0; i < 64; i++)
for (j = 0; j < 64; j++)
m_sbox[b][(i << 6) | j] =
(u_char)((u_sbox[(b << 1)][i] << 4) |
u_sbox[(b << 1) + 1][j]);
/*
* Set up the initial & final permutations into a useful form, and
* initialise the inverted key permutation.
*/
for (i = 0; i < 64; i++) {
init_perm[final_perm[i] = IP[i] - 1] = (u_char)i;
inv_key_perm[i] = 255;
}
/*
* Invert the key permutation and initialise the inverted key
* compression permutation.
*/
for (i = 0; i < 56; i++) {
inv_key_perm[key_perm[i] - 1] = (u_char)i;
inv_comp_perm[i] = 255;
}
/*
* Invert the key compression permutation.
*/
for (i = 0; i < 48; i++) {
inv_comp_perm[comp_perm[i] - 1] = (u_char)i;
}
/*
* Set up the OR-mask arrays for the initial and final permutations,
* and for the key initial and compression permutations.
*/
for (k = 0; k < 8; k++) {
for (i = 0; i < 256; i++) {
*(il = &ip_maskl[k][i]) = 0L;
*(ir = &ip_maskr[k][i]) = 0L;
*(fl = &fp_maskl[k][i]) = 0L;
*(fr = &fp_maskr[k][i]) = 0L;
for (j = 0; j < 8; j++) {
inbit = 8 * k + j;
if (i & bits8[j]) {
if ((obit = init_perm[inbit]) < 32)
*il |= bits32[obit];
else
*ir |= bits32[obit-32];
if ((obit = final_perm[inbit]) < 32)
*fl |= bits32[obit];
else
*fr |= bits32[obit - 32];
}
}
}
for (i = 0; i < 128; i++) {
*(il = &key_perm_maskl[k][i]) = 0L;
*(ir = &key_perm_maskr[k][i]) = 0L;
for (j = 0; j < 7; j++) {
inbit = 8 * k + j;
if (i & bits8[j + 1]) {
if ((obit = inv_key_perm[inbit]) == 255)
continue;
if (obit < 28)
*il |= bits28[obit];
else
*ir |= bits28[obit - 28];
}
}
*(il = &comp_maskl[k][i]) = 0L;
*(ir = &comp_maskr[k][i]) = 0L;
for (j = 0; j < 7; j++) {
inbit = 7 * k + j;
if (i & bits8[j + 1]) {
if ((obit=inv_comp_perm[inbit]) == 255)
continue;
if (obit < 24)
*il |= bits24[obit];
else
*ir |= bits24[obit - 24];
}
}
}
}
/*
* Invert the P-box permutation, and convert into OR-masks for
* handling the output of the S-box arrays setup above.
*/
for (i = 0; i < 32; i++)
un_pbox[pbox[i] - 1] = (u_char)i;
for (b = 0; b < 4; b++)
for (i = 0; i < 256; i++) {
*(p = &psbox[b][i]) = 0L;
for (j = 0; j < 8; j++) {
if (i & bits8[j])
*p |= bits32[un_pbox[8 * b + j]];
}
}
des_initialised = 1;
}
static void
setup_salt(u_int32_t salt)
{
u_int32_t obit, saltbit;
int i;
if (salt == old_salt)
return;
old_salt = salt;
saltbits = 0L;
saltbit = 1;
obit = 0x800000;
for (i = 0; i < 24; i++) {
if (salt & saltbit)
saltbits |= obit;
saltbit <<= 1;
obit >>= 1;
}
}
static int
des_setkey(const char *key)
{
u_int32_t k0, k1, rawkey0, rawkey1;
int shifts, round;
if (!des_initialised)
des_init();
rawkey0 = ntohl(*(const u_int32_t *) key);
rawkey1 = ntohl(*(const u_int32_t *) (key + 4));
if ((rawkey0 | rawkey1)
&& rawkey0 == old_rawkey0
&& rawkey1 == old_rawkey1) {
/*
* Already setup for this key.
* This optimisation fails on a zero key (which is weak and
* has bad parity anyway) in order to simplify the starting
* conditions.
*/
return(0);
}
old_rawkey0 = rawkey0;
old_rawkey1 = rawkey1;
/*
* Do key permutation and split into two 28-bit subkeys.
*/
k0 = key_perm_maskl[0][rawkey0 >> 25]
| key_perm_maskl[1][(rawkey0 >> 17) & 0x7f]
| key_perm_maskl[2][(rawkey0 >> 9) & 0x7f]
| key_perm_maskl[3][(rawkey0 >> 1) & 0x7f]
| key_perm_maskl[4][rawkey1 >> 25]
| key_perm_maskl[5][(rawkey1 >> 17) & 0x7f]
| key_perm_maskl[6][(rawkey1 >> 9) & 0x7f]
| key_perm_maskl[7][(rawkey1 >> 1) & 0x7f];
k1 = key_perm_maskr[0][rawkey0 >> 25]
| key_perm_maskr[1][(rawkey0 >> 17) & 0x7f]
| key_perm_maskr[2][(rawkey0 >> 9) & 0x7f]
| key_perm_maskr[3][(rawkey0 >> 1) & 0x7f]
| key_perm_maskr[4][rawkey1 >> 25]
| key_perm_maskr[5][(rawkey1 >> 17) & 0x7f]
| key_perm_maskr[6][(rawkey1 >> 9) & 0x7f]
| key_perm_maskr[7][(rawkey1 >> 1) & 0x7f];
/*
* Rotate subkeys and do compression permutation.
*/
shifts = 0;
for (round = 0; round < 16; round++) {
u_int32_t t0, t1;
shifts += key_shifts[round];
t0 = (k0 << shifts) | (k0 >> (28 - shifts));
t1 = (k1 << shifts) | (k1 >> (28 - shifts));
de_keysl[15 - round] =
en_keysl[round] = comp_maskl[0][(t0 >> 21) & 0x7f]
| comp_maskl[1][(t0 >> 14) & 0x7f]
| comp_maskl[2][(t0 >> 7) & 0x7f]
| comp_maskl[3][t0 & 0x7f]
| comp_maskl[4][(t1 >> 21) & 0x7f]
| comp_maskl[5][(t1 >> 14) & 0x7f]
| comp_maskl[6][(t1 >> 7) & 0x7f]
| comp_maskl[7][t1 & 0x7f];
de_keysr[15 - round] =
en_keysr[round] = comp_maskr[0][(t0 >> 21) & 0x7f]
| comp_maskr[1][(t0 >> 14) & 0x7f]
| comp_maskr[2][(t0 >> 7) & 0x7f]
| comp_maskr[3][t0 & 0x7f]
| comp_maskr[4][(t1 >> 21) & 0x7f]
| comp_maskr[5][(t1 >> 14) & 0x7f]
| comp_maskr[6][(t1 >> 7) & 0x7f]
| comp_maskr[7][t1 & 0x7f];
}
return(0);
}
static int
do_des( u_int32_t l_in, u_int32_t r_in, u_int32_t *l_out, u_int32_t *r_out, int count)
{
/*
* l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format.
*/
u_int32_t l, r, *kl, *kr, *kl1, *kr1;
u_int32_t f, r48l, r48r;
int round;
if (count == 0) {
return(1);
} else if (count > 0) {
/*
* Encrypting
*/
kl1 = en_keysl;
kr1 = en_keysr;
} else {
/*
* Decrypting
*/
count = -count;
kl1 = de_keysl;
kr1 = de_keysr;
}
/*
* Do initial permutation (IP).
*/
l = ip_maskl[0][l_in >> 24]
| ip_maskl[1][(l_in >> 16) & 0xff]
| ip_maskl[2][(l_in >> 8) & 0xff]
| ip_maskl[3][l_in & 0xff]
| ip_maskl[4][r_in >> 24]
| ip_maskl[5][(r_in >> 16) & 0xff]
| ip_maskl[6][(r_in >> 8) & 0xff]
| ip_maskl[7][r_in & 0xff];
r = ip_maskr[0][l_in >> 24]
| ip_maskr[1][(l_in >> 16) & 0xff]
| ip_maskr[2][(l_in >> 8) & 0xff]
| ip_maskr[3][l_in & 0xff]
| ip_maskr[4][r_in >> 24]
| ip_maskr[5][(r_in >> 16) & 0xff]
| ip_maskr[6][(r_in >> 8) & 0xff]
| ip_maskr[7][r_in & 0xff];
while (count--) {
/*
* Do each round.
*/
kl = kl1;
kr = kr1;
round = 16;
while (round--) {
/*
* Expand R to 48 bits (simulate the E-box).
*/
r48l = ((r & 0x00000001) << 23)
| ((r & 0xf8000000) >> 9)
| ((r & 0x1f800000) >> 11)
| ((r & 0x01f80000) >> 13)
| ((r & 0x001f8000) >> 15);
r48r = ((r & 0x0001f800) << 7)
| ((r & 0x00001f80) << 5)
| ((r & 0x000001f8) << 3)
| ((r & 0x0000001f) << 1)
| ((r & 0x80000000) >> 31);
/*
* Do salting for crypt() and friends, and
* XOR with the permuted key.
*/
f = (r48l ^ r48r) & saltbits;
r48l ^= f ^ *kl++;
r48r ^= f ^ *kr++;
/*
* Do sbox lookups (which shrink it back to 32 bits)
* and do the pbox permutation at the same time.
*/
f = psbox[0][m_sbox[0][r48l >> 12]]
| psbox[1][m_sbox[1][r48l & 0xfff]]
| psbox[2][m_sbox[2][r48r >> 12]]
| psbox[3][m_sbox[3][r48r & 0xfff]];
/*
* Now that we've permuted things, complete f().
*/
f ^= l;
l = r;
r = f;
}
r = l;
l = f;
}
/*
* Do final permutation (inverse of IP).
*/
*l_out = fp_maskl[0][l >> 24]
| fp_maskl[1][(l >> 16) & 0xff]
| fp_maskl[2][(l >> 8) & 0xff]
| fp_maskl[3][l & 0xff]
| fp_maskl[4][r >> 24]
| fp_maskl[5][(r >> 16) & 0xff]
| fp_maskl[6][(r >> 8) & 0xff]
| fp_maskl[7][r & 0xff];
*r_out = fp_maskr[0][l >> 24]
| fp_maskr[1][(l >> 16) & 0xff]
| fp_maskr[2][(l >> 8) & 0xff]
| fp_maskr[3][l & 0xff]
| fp_maskr[4][r >> 24]
| fp_maskr[5][(r >> 16) & 0xff]
| fp_maskr[6][(r >> 8) & 0xff]
| fp_maskr[7][r & 0xff];
return(0);
}
static int
des_cipher(const char *in, char *out, u_long salt, int count)
{
u_int32_t l_out, r_out, rawl, rawr;
int retval;
union {
u_int32_t *ui32;
const char *c;
} trans;
if (!des_initialised)
des_init();
setup_salt(salt);
trans.c = in;
rawl = ntohl(*trans.ui32++);
rawr = ntohl(*trans.ui32);
retval = do_des(rawl, rawr, &l_out, &r_out, count);
trans.c = out;
*trans.ui32++ = htonl(l_out);
*trans.ui32 = htonl(r_out);
return(retval);
}
int
crypt_des(const char *key, const char *setting, char *buffer)
{
int i;
u_int32_t count, salt, l, r0, r1, keybuf[2];
u_char *q;
if (!des_initialised)
des_init();
/*
* Copy the key, shifting each character up by one bit
* and padding with zeros.
*/
q = (u_char *)keybuf;
while (q - (u_char *)keybuf - 8) {
*q++ = *key << 1;
if (*key != '\0')
key++;
}
if (des_setkey((char *)keybuf))
return (-1);
if (*setting == _PASSWORD_EFMT1) {
/*
* "new"-style:
* setting - underscore, 4 bytes of count, 4 bytes of salt
* key - unlimited characters
*/
for (i = 1, count = 0L; i < 5; i++)
count |= ascii_to_bin(setting[i]) << ((i - 1) * 6);
for (i = 5, salt = 0L; i < 9; i++)
salt |= ascii_to_bin(setting[i]) << ((i - 5) * 6);
while (*key) {
/*
* Encrypt the key with itself.
*/
if (des_cipher((char *)keybuf, (char *)keybuf, 0L, 1))
return (-1);
/*
* And XOR with the next 8 characters of the key.
*/
q = (u_char *)keybuf;
while (q - (u_char *)keybuf - 8 && *key)
*q++ ^= *key++ << 1;
if (des_setkey((char *)keybuf))
return (-1);
}
buffer = stpncpy(buffer, setting, 9);
} else {
/*
* "old"-style:
* setting - 2 bytes of salt
* key - up to 8 characters
*/
count = 25;
salt = (ascii_to_bin(setting[1]) << 6)
| ascii_to_bin(setting[0]);
*buffer++ = setting[0];
/*
* If the encrypted password that the salt was extracted from
* is only 1 character long, the salt will be corrupted. We
* need to ensure that the output string doesn't have an extra
* NUL in it!
*/
*buffer++ = setting[1] ? setting[1] : setting[0];
}
setup_salt(salt);
/*
* Do it.
*/
if (do_des(0L, 0L, &r0, &r1, (int)count))
return (-1);
/*
* Now encode the result...
*/
l = (r0 >> 8);
*buffer++ = ascii64[(l >> 18) & 0x3f];
*buffer++ = ascii64[(l >> 12) & 0x3f];
*buffer++ = ascii64[(l >> 6) & 0x3f];
*buffer++ = ascii64[l & 0x3f];
l = (r0 << 16) | ((r1 >> 16) & 0xffff);
*buffer++ = ascii64[(l >> 18) & 0x3f];
*buffer++ = ascii64[(l >> 12) & 0x3f];
*buffer++ = ascii64[(l >> 6) & 0x3f];
*buffer++ = ascii64[l & 0x3f];
l = r1 << 2;
*buffer++ = ascii64[(l >> 12) & 0x3f];
*buffer++ = ascii64[(l >> 6) & 0x3f];
*buffer++ = ascii64[l & 0x3f];
*buffer = '\0';
return (0);
}
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