-/* vi: set sw=4 ts=4: */
/*
- * The one and only crypt(3) function.
+ * FreeSec: libcrypt
*
- * This source code is derived from Minix's pwdauth.c, which was based
- * on Andy Tanenbaum's book "Computer Networks", and then rewritten in
- * C by Kees J. Bot, 7 Feb 1994. This code was ported from Minix to
- * uClibc on June 28, 2001 by Manuel Novoa III, and then reshuffled to
- * be reentrant by Erik Andersen <andersen@uclibc.org> on June 28, 2001.
+ * Copyright (c) 1994 David Burren
+ * All rights reserved.
*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Library General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
+ * 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.
+ * 4. 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 program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
- * for more details.
+ * 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.
*
- * You should have received a copy of the GNU Library General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
- * Original copyright notice is retained at the end of this file.
+ * This is an original implementation of the DES and the crypt(3) interfaces
+ * by David Burren <davidb@werj.com.au>.
*
- */
-
-
-
-/* This program gets as input the key and salt arguments of the crypt(3)
- * function as two null terminated strings. The crypt result is output as
- * one null terminated string. Input and output must be <= 1024 characters.
- * The exit code will be 1 on any error.
+ * 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.
*
- * If the key has the form '##name' then the key will be encrypted and the
- * result checked to be equal to the encrypted password in the shadow password
- * file. If equal than '##name' will be returned, otherwise exit code 2.
+ * 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.
*
- * Otherwise the key will be encrypted normally and the result returned.
+ * NOTE:
+ * This file must copy certain chunks of crypt.c for legal reasons.
+ * crypt.c can only export the interface crypt(), to make binaries
+ * exportable from the USA. Hence, to also have the other crypto interfaces
+ * available we have to copy pieces...
*
- * As a special case, anything matches a null encrypted password to allow
- * a no-password login.
*/
+#define __FORCE_GLIBC
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <netinet/in.h>
+#include <pwd.h>
#include <string.h>
#include <crypt.h>
-static char * __md5_crypt_r( const char *pw, const char *salt, struct crypt_data * data);
-
-static const struct ordering __des_InitialTr = { {
- 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 const struct ordering __des_FinalTr = { {
- 40, 8,48,16,56,24,64,32,39, 7,47,15,55,23,63,31,
- 38, 6,46,14,54,22,62,30,37, 5,45,13,53,21,61,29,
- 36, 4,44,12,52,20,60,28,35, 3,43,11,51,19,59,27,
- 34, 2,42,10,50,18,58,26,33, 1,41, 9,49,17,57,25,
-} };
-
-static const struct ordering __des_Swap = { {
- 33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
- 49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,
- 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,
- 17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,
-} };
-
-static const struct ordering __des_KeyTr1 = { {
- 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 const struct ordering __des_KeyTr2 = { {
- 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,
-} };
-
-static const struct ordering __des_Etr = { {
- 32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9,
- 8, 9,10,11,12,13,12,13,14,15,16,17,
- 16,17,18,19,20,21,20,21,22,23,24,25,
- 24,25,26,27,28,29,28,29,30,31,32, 1,
-} };
-
-static const struct ordering __des_Ptr = { {
- 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 const unsigned char __des_S_boxes[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 ascii64[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+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 const int __des_Rots[] = {
- 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1,
+static u_char inv_key_perm[64];
+static u_char u_key_perm[56];
+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 void __des_transpose(struct block *data, const struct ordering *t, int n)
-{
- struct block x;
+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
+};
- x = *data;
+/*
+ * No E box is used, as it's replaced by some ANDs, shifts, and ORs.
+ */
- while (n-- > 0) {
- data->b_data[n] = x.b_data[t->o_data[n] - 1];
+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 void __des_rotate(struct block *key)
+static u_int32_t bits32[32] =
{
- unsigned char *p = key->b_data;
- unsigned char *ep = &(key->b_data[55]);
- int data0 = key->b_data[0], data28 = key->b_data[28];
+ 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
+};
- while (p++ < ep) *(p-1) = *p;
- key->b_data[27] = data0;
- key->b_data[55] = data28;
+static u_char bits8[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
+
+static u_int32_t saltbits;
+static 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 __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_encrypt(int i, struct block *key, struct block *a, struct block *x, struct crypt_data *data)
+static void des_init(void)
{
- struct block e, ikey, y;
- int k;
- unsigned char *p, *q, *r;
-
- e = *a;
- __des_transpose(&e, data->EP, 48);
- for (k = __des_Rots[i]; k; k--) __des_rotate(key);
- ikey = *key;
- __des_transpose(&ikey, &__des_KeyTr2, 48);
- p = &(y.b_data[48]);
- q = &(e.b_data[48]);
- r = &(ikey.b_data[48]);
- while (p > y.b_data) {
- *--p = *--q ^ *--r;
+ int i, j, b, k, inbit, obit;
+ u_int32_t *p, *il, *ir, *fl, *fr;
+
+ old_rawkey0 = old_rawkey1 = 0;
+ saltbits = 0;
+ old_salt = 0;
+ 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_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] = i;
+ inv_key_perm[i] = 255;
}
- q = x->b_data;
- for (k = 0; k < 8; k++) {
- int xb, r;
- r = *p++ << 5;
- r += *p++ << 3;
- r += *p++ << 2;
- r += *p++ << 1;
- r += *p++;
- r += *p++ << 4;
+ /*
+ * Invert the key permutation and initialise the inverted key
+ * compression permutation.
+ */
+ for (i = 0; i < 56; i++) {
+ u_key_perm[i] = key_perm[i] - 1;
+ inv_key_perm[key_perm[i] - 1] = i;
+ inv_comp_perm[i] = 255;
+ }
- xb = __des_S_boxes[k][r];
+ /*
+ * Invert the key compression permutation.
+ */
+ for (i = 0; i < 48; i++) {
+ inv_comp_perm[comp_perm[i] - 1] = i;
+ }
- *q++ = (xb >> 3) & 1;
- *q++ = (xb>>2) & 1;
- *q++ = (xb>>1) & 1;
- *q++ = (xb & 1);
+ /*
+ * 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]) = 0;
+ *(ir = &ip_maskr[k][i]) = 0;
+ *(fl = &fp_maskl[k][i]) = 0;
+ *(fr = &fp_maskr[k][i]) = 0;
+ 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]) = 0;
+ *(ir = &key_perm_maskr[k][i]) = 0;
+ 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]) = 0;
+ *(ir = &comp_maskr[k][i]) = 0;
+ 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];
+ }
+ }
+ }
}
- __des_transpose(x, &__des_Ptr, 32);
+
+ /*
+ * 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] = i;
+
+ for (b = 0; b < 4; b++)
+ for (i = 0; i < 256; i++) {
+ *(p = &psbox[b][i]) = 0;
+ for (j = 0; j < 8; j++) {
+ if (i & bits8[j])
+ *p |= bits32[un_pbox[8 * b + j]];
+ }
+ }
+
+ des_initialised = 1;
}
-extern void setkey_r(const char *k, struct crypt_data *data)
+static void setup_salt(int32_t salt)
{
- struct block *key = &(data->key);
- memcpy(key, k, (sizeof(struct block)));
- __des_transpose(key, &__des_KeyTr1, 56);
+ u_int32_t obit, saltbit;
+ int i;
+
+ if (salt == old_salt)
+ return;
+ old_salt = salt;
+
+ saltbits = 0;
+ saltbit = 1;
+ obit = 0x800000;
+ for (i = 0; i < 24; i++) {
+ if (salt & saltbit)
+ saltbits |= obit;
+ saltbit <<= 1;
+ obit >>= 1;
+ }
}
-extern void encrypt_r(char *blck, int edflag, struct crypt_data *data)
+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, struct crypt_data *data)
{
- struct block *key = &(data->key);
- struct block *p = (struct block *) blck;
- int i;
-
- __des_transpose(p, &__des_InitialTr, 64);
- data->EP = &__des_Etr;
- for (i = 15; i>= 0; i--) {
- int j = edflag ? i : 15 - i;
- int k;
- struct block b, x;
-
- b = *p;
- for (k = 31; k >= 0; k--) {
- p->b_data[k] = b.b_data[k + 32];
- }
- __des_encrypt(j, key, p, &x, data);
- for (k = 31; k >= 0; k--) {
- p->b_data[k+32] = b.b_data[k] ^ x.b_data[k];
+ /*
+ * l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format.
+ */
+ int round;
+ u_int32_t l, r, *kl, *kr, *kl1, *kr1;
+ u_int32_t f, r48l, r48r;
+#if 0
+ u_int32_t *en_keysl = &(data->key[0]);
+ u_int32_t *en_keysr = &(data->key[16]);
+ u_int32_t *de_keysl = &(data->key[32]);
+ u_int32_t *de_keysr = &(data->key[48]);
+#endif
+
+ 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;
}
- __des_transpose(p, &__des_Swap, 64);
- __des_transpose(p, &__des_FinalTr, 64);
+ /*
+ * 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);
}
-extern char *crypt_r(const char *pw, const char *salt, struct crypt_data *data)
+static int des_setkey_r(const char *key, struct crypt_data *data)
{
- char pwb[66];
- char *cp;
- static char result[16];
- char *p = pwb;
- struct ordering new_etr;
- int i;
-
- /* First, check if we are supposed to be using the MD5 replacement
- * instead of DES... */
- if (salt[0]=='$' && salt[1]=='1' && salt[2]=='$')
- return __md5_crypt_r(pw, salt, data);
-
- while (*pw && p < &pwb[64]) {
- int j = 7;
-
- while (j--) {
- *p++ = (*pw >> j) & 01;
- }
- pw++;
- *p++ = 0;
+ u_int32_t k0, k1, rawkey0, rawkey1;
+ int shifts, round;
+#if 0
+ u_int32_t *en_keysl = &(data->key[0]);
+ u_int32_t *en_keysr = &(data->key[16]);
+ u_int32_t *de_keysl = &(data->key[32]);
+ u_int32_t *de_keysr = &(data->key[48]);
+#endif
+
+ if (!des_initialised)
+ des_init();
+
+ rawkey0 = ntohl(*(u_int32_t *) key);
+ rawkey1 = ntohl(*(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];
}
- while (p < &pwb[64]) *p++ = 0;
+ return(0);
+}
- setkey_r(p = pwb, data);
+static int __des_setkey_r(const char *key, struct crypt_data *data)
+{
+ int i, j;
+ u_int32_t packed_keys[2];
+ u_char *p;
- while (p < &pwb[66]) *p++ = 0;
+ p = (u_char *) packed_keys;
- new_etr = __des_Etr;
- data->EP = &new_etr;
- if (salt[0] == 0 || salt[1] == 0) salt = "**";
- for (i = 0; i < 2; i++) {
- char c = *salt++;
- int j;
-
- result[i] = c;
- if ( c > 'Z') c -= 6 + 7 + '.'; /* c was a lower case letter */
- else if ( c > '9') c -= 7 + '.';/* c was upper case letter */
- else c -= '.'; /* c was digit, '.' or '/'. */
- /* now, 0 <= c <= 63 */
- for (j = 0; j < 6; j++) {
- if ((c >> j) & 01) {
- int t = 6*i + j;
- int temp = new_etr.o_data[t];
- new_etr.o_data[t] = new_etr.o_data[t+24];
- new_etr.o_data[t+24] = temp;
- }
- }
+ for (i = 0; i < 8; i++) {
+ p[i] = 0;
+ for (j = 0; j < 8; j++)
+ if (*key++ & 1)
+ p[i] |= bits8[j];
}
+ return(des_setkey_r(p, data));
+}
- if (result[1] == 0) result[1] = result[0];
-
- data->EP = &__des_Etr;
- for (i = 0; i < 25; i++) encrypt_r(pwb,0, data);
- data->EP = &__des_Etr;
+static int __des_encrypt_r(char *block, int flag, struct crypt_data *data)
+{
+ u_int32_t io[2];
+ u_char *p;
+ int i, j, retval;
- p = pwb;
- cp = result+2;
- while (p < &pwb[66]) {
- int c = 0;
- int j = 6;
+ if (!des_initialised)
+ des_init();
- while (j--) {
- c <<= 1;
- c |= *p++;
- }
- c += '.'; /* becomes >= '.' */
- if (c > '9') c += 7; /* not in [./0-9], becomes upper */
- if (c > 'Z') c += 6; /* not in [A-Z], becomes lower */
- *cp++ = c;
+ setup_salt((int32_t)0);
+ p = (u_char *)block;
+ for (i = 0; i < 2; i++) {
+ io[i] = 0L;
+ for (j = 0; j < 32; j++)
+ if (*p++ & 1)
+ io[i] |= bits32[j];
}
- *cp = 0;
- return result;
+ retval = do_des(io[0], io[1], io, io + 1, flag ? -1 : 1, data);
+ for (i = 0; i < 2; i++)
+ for (j = 0; j < 32; j++)
+ block[(i << 5) | j] = (io[i] & bits32[j]) ? 1 : 0;
+ return(retval);
}
+extern char *__des_crypt_r(const char *key, const char *setting, struct crypt_data *data)
+{
+ u_int32_t count, salt, l, r0, r1, keybuf[2];
+ u_char *p, *q;
+ /* This is a nice place where we can grab a bit of reentrant space...
+ * I'd create a separate field in struct crypt_data, but this spot
+ * should do nicely for now... */
+ char *output = data->key.b_data;
+
+ 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 (*(q - 1))
+ key++;
+ }
-/*
- * Copyright (c) 1987,1997, Prentice Hall
- * All rights reserved.
- *
- * Redistribution and use of the MINIX operating system in source and
- * binary forms, with or without modification, are permitted provided
- * that the following conditions are met:
- *
- * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 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.
- *
- * Neither the name of Prentice Hall nor the names of the software
- * authors or contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, 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 PRENTICE HALL OR ANY AUTHORS 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.
- *
- */
+ if (__des_setkey_r((char *)keybuf, data))
+ return(NULL);
+
+#if 0
+ if (*setting == _PASSWORD_EFMT1) {
+ int i;
+ /*
+ * "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_encrypt_r((char *)keybuf, (char *)keybuf, 0L, 1), data)
+ return(NULL);
+ /*
+ * 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(NULL);
+ }
+ strncpy(output, setting, 9);
+
+ /*
+ * Double check that we weren't given a short setting.
+ * If we were, the above code will probably have created
+ * wierd values for count and salt, but we don't really care.
+ * Just make sure the output string doesn't have an extra
+ * NUL in it.
+ */
+ output[9] = '\0';
+ p = (u_char *)output + strlen(output);
+ } else
+#endif
+ {
+ /*
+ * "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]);
+
+ output[0] = 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!
+ */
+ output[1] = setting[1] ? setting[1] : output[0];
+
+ p = (u_char *)output + 2;
+ }
+ setup_salt(salt);
+ /*
+ * Do it.
+ */
+ if (do_des(0L, 0L, &r0, &r1, (int)count, data))
+ return(NULL);
+ /*
+ * Now encode the result...
+ */
+ l = (r0 >> 8);
+ *p++ = ascii64[(l >> 18) & 0x3f];
+ *p++ = ascii64[(l >> 12) & 0x3f];
+ *p++ = ascii64[(l >> 6) & 0x3f];
+ *p++ = ascii64[l & 0x3f];
+
+ l = (r0 << 16) | ((r1 >> 16) & 0xffff);
+ *p++ = ascii64[(l >> 18) & 0x3f];
+ *p++ = ascii64[(l >> 12) & 0x3f];
+ *p++ = ascii64[(l >> 6) & 0x3f];
+ *p++ = ascii64[l & 0x3f];
+
+ l = r1 << 2;
+ *p++ = ascii64[(l >> 12) & 0x3f];
+ *p++ = ascii64[(l >> 6) & 0x3f];
+ *p++ = ascii64[l & 0x3f];
+ *p = 0;
+
+ return output;
+}
+#warning FIXME - setkey_r, encrypt_r, and __des_crypt_r are not really reentrant
+void setkey_r(const char *key, struct crypt_data *data)
+{
+ __des_setkey_r(key, data);
+}
-#include <md5.c>
+extern void encrypt_r(char *block, int edflag, struct crypt_data *data)
+{
+ __des_encrypt_r(block, edflag, data);
+}
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