[8ad6681b] | 1 | /* |
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| 2 | * FreeSec: libcrypt for NetBSD |
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| 3 | * |
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| 4 | * Copyright (c) 1994 David Burren |
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| 5 | * All rights reserved. |
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| 6 | * |
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| 7 | * Ported to RTEMS and made reentrant by Till Straumann, 9/2003 |
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| 8 | * |
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| 9 | * Adapted for FreeBSD-2.0 by Geoffrey M. Rehmet |
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| 10 | * this file should now *only* export crypt(), in order to make |
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| 11 | * binaries of libcrypt exportable from the USA |
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| 12 | * |
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| 13 | * Adapted for FreeBSD-4.0 by Mark R V Murray |
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| 14 | * this file should now *only* export crypt_des(), in order to make |
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| 15 | * a module that can be optionally included in libcrypt. |
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| 16 | * |
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| 17 | * Redistribution and use in source and binary forms, with or without |
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| 18 | * modification, are permitted provided that the following conditions |
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| 19 | * are met: |
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| 20 | * 1. Redistributions of source code must retain the above copyright |
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| 21 | * notice, this list of conditions and the following disclaimer. |
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| 22 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 23 | * notice, this list of conditions and the following disclaimer in the |
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| 24 | * documentation and/or other materials provided with the distribution. |
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| 25 | * 3. Neither the name of the author nor the names of other contributors |
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| 26 | * may be used to endorse or promote products derived from this software |
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| 27 | * without specific prior written permission. |
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| 28 | * |
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| 29 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 30 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 31 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 32 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 33 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 34 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 35 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 36 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 37 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 38 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 39 | * SUCH DAMAGE. |
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| 40 | * |
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| 41 | * This is an original implementation of the DES and the crypt(3) interfaces |
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| 42 | * by David Burren <davidb@werj.com.au>. |
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| 43 | * |
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| 44 | * An excellent reference on the underlying algorithm (and related |
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| 45 | * algorithms) is: |
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| 46 | * |
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| 47 | * B. Schneier, Applied Cryptography: protocols, algorithms, |
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| 48 | * and source code in C, John Wiley & Sons, 1994. |
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| 49 | * |
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| 50 | * Note that in that book's description of DES the lookups for the initial, |
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| 51 | * pbox, and final permutations are inverted (this has been brought to the |
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| 52 | * attention of the author). A list of errata for this book has been |
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| 53 | * posted to the sci.crypt newsgroup by the author and is available for FTP. |
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| 54 | * |
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| 55 | * ARCHITECTURE ASSUMPTIONS: |
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| 56 | * It is assumed that the 8-byte arrays passed by reference can be |
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| 57 | * addressed as arrays of u_int32_t's (ie. the CPU is not picky about |
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| 58 | * alignment). |
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| 59 | */ |
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| 60 | |
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| 61 | #define __FORCE_GLIBC |
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| 62 | #include <sys/cdefs.h> |
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| 63 | #include <sys/types.h> |
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| 64 | #include <sys/param.h> |
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| 65 | #include <netinet/in.h> |
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| 66 | #ifndef __rtems__ |
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| 67 | #include <pwd.h> |
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| 68 | #include <string.h> |
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| 69 | #include <crypt.h> |
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| 70 | #endif |
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| 71 | #include <stdlib.h> |
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| 72 | |
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| 73 | #define REENTRANT |
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| 74 | /* Re-entrantify me -- all this junk needs to be in |
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| 75 | * struct crypt_data to make this really reentrant... */ |
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| 76 | |
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| 77 | /* TS; not really - only the stuff in Des_Context */ |
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| 78 | static struct fixed { |
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| 79 | u_char inv_key_perm[64]; |
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| 80 | u_char inv_comp_perm[56]; |
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| 81 | u_char u_sbox[8][64]; |
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| 82 | u_char un_pbox[32]; |
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| 83 | u_int32_t ip_maskl[8][256], ip_maskr[8][256]; |
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| 84 | u_int32_t fp_maskl[8][256], fp_maskr[8][256]; |
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| 85 | u_int32_t key_perm_maskl[8][128], key_perm_maskr[8][128]; |
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| 86 | u_int32_t comp_maskl[8][128], comp_maskr[8][128]; |
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| 87 | } des_f; |
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| 88 | |
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| 89 | #define inv_key_perm des_f.inv_key_perm |
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| 90 | #define inv_comp_perm des_f.inv_comp_perm |
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| 91 | #define u_sbox des_f.u_sbox |
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| 92 | #define un_pbox des_f.un_pbox |
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| 93 | #define ip_maskl des_f.ip_maskl |
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| 94 | #define ip_maskr des_f.ip_maskr |
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| 95 | #define fp_maskl des_f.fp_maskl |
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| 96 | #define fp_maskr des_f.fp_maskr |
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| 97 | #define key_perm_maskl des_f.key_perm_maskl |
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| 98 | #define key_perm_maskr des_f.key_perm_maskr |
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| 99 | #define comp_maskl des_f.comp_maskl |
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| 100 | #define comp_maskr des_f.comp_maskr |
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| 101 | |
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| 102 | /* These need to be maintained per-process */ |
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| 103 | struct Des_Context { |
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| 104 | u_int32_t en_keysl[16], en_keysr[16]; |
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| 105 | u_int32_t de_keysl[16], de_keysr[16]; |
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| 106 | u_int32_t saltbits; |
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| 107 | u_int32_t old_salt; |
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| 108 | u_int32_t old_rawkey0, old_rawkey1; |
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| 109 | }; |
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| 110 | |
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| 111 | #ifndef REENTRANT |
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| 112 | static struct Des_Context single; |
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| 113 | #endif |
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| 114 | |
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| 115 | #define en_keysl des_ctx->en_keysl |
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| 116 | #define en_keysr des_ctx->en_keysr |
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| 117 | #define de_keysl des_ctx->de_keysl |
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| 118 | #define de_keysr des_ctx->de_keysr |
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| 119 | #define saltbits des_ctx->saltbits |
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| 120 | #define old_salt des_ctx->old_salt |
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| 121 | #define old_rawkey0 des_ctx->old_rawkey0 |
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| 122 | #define old_rawkey1 des_ctx->old_rawkey1 |
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| 123 | |
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| 124 | /* Static stuff that stays resident and doesn't change after |
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| 125 | * being initialized, and therefore doesn't need to be made |
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| 126 | * reentrant. */ |
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| 127 | static u_char init_perm[64], final_perm[64]; |
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| 128 | static u_char m_sbox[4][4096]; |
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| 129 | static u_int32_t psbox[4][256]; |
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| 130 | |
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| 131 | |
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| 132 | |
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| 133 | |
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| 134 | /* A pile of data */ |
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| 135 | static const u_char ascii64[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; |
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| 136 | |
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| 137 | static const u_char IP[64] = { |
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| 138 | 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, |
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| 139 | 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, |
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| 140 | 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, |
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| 141 | 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7 |
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| 142 | }; |
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| 143 | |
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| 144 | static const u_char key_perm[56] = { |
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| 145 | 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, |
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| 146 | 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36, |
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| 147 | 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, |
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| 148 | 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4 |
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| 149 | }; |
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| 150 | |
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| 151 | static const u_char key_shifts[16] = { |
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| 152 | 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 |
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| 153 | }; |
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| 154 | |
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| 155 | static const u_char comp_perm[48] = { |
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| 156 | 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, |
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| 157 | 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, |
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| 158 | 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, |
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| 159 | 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32 |
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| 160 | }; |
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| 161 | |
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| 162 | /* |
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| 163 | * No E box is used, as it's replaced by some ANDs, shifts, and ORs. |
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| 164 | */ |
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| 165 | |
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| 166 | static const u_char sbox[8][64] = { |
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| 167 | { |
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| 168 | 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, |
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| 169 | 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, |
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| 170 | 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, |
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| 171 | 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 |
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| 172 | }, |
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| 173 | { |
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| 174 | 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, |
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| 175 | 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, |
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| 176 | 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, |
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| 177 | 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 |
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| 178 | }, |
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| 179 | { |
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| 180 | 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, |
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| 181 | 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, |
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| 182 | 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, |
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| 183 | 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 |
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| 184 | }, |
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| 185 | { |
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| 186 | 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, |
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| 187 | 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, |
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| 188 | 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, |
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| 189 | 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 |
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| 190 | }, |
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| 191 | { |
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| 192 | 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, |
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| 193 | 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, |
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| 194 | 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, |
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| 195 | 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 |
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| 196 | }, |
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| 197 | { |
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| 198 | 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, |
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| 199 | 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, |
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| 200 | 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, |
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| 201 | 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 |
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| 202 | }, |
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| 203 | { |
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| 204 | 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, |
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| 205 | 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, |
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| 206 | 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, |
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| 207 | 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 |
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| 208 | }, |
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| 209 | { |
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| 210 | 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, |
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| 211 | 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, |
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| 212 | 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, |
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| 213 | 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 |
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| 214 | } |
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| 215 | }; |
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| 216 | |
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| 217 | static const u_char pbox[32] = { |
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| 218 | 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, |
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| 219 | 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25 |
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| 220 | }; |
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| 221 | |
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| 222 | static const u_int32_t bits32[32] = |
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| 223 | { |
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| 224 | 0x80000000, 0x40000000, 0x20000000, 0x10000000, |
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| 225 | 0x08000000, 0x04000000, 0x02000000, 0x01000000, |
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| 226 | 0x00800000, 0x00400000, 0x00200000, 0x00100000, |
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| 227 | 0x00080000, 0x00040000, 0x00020000, 0x00010000, |
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| 228 | 0x00008000, 0x00004000, 0x00002000, 0x00001000, |
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| 229 | 0x00000800, 0x00000400, 0x00000200, 0x00000100, |
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| 230 | 0x00000080, 0x00000040, 0x00000020, 0x00000010, |
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| 231 | 0x00000008, 0x00000004, 0x00000002, 0x00000001 |
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| 232 | }; |
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| 233 | |
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| 234 | static const u_char bits8[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 }; |
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| 235 | static const u_int32_t *bits28, *bits24; |
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| 236 | |
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| 237 | |
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| 238 | static int |
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| 239 | ascii_to_bin(char ch) |
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| 240 | { |
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| 241 | if (ch > 'z') |
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| 242 | return(0); |
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| 243 | if (ch >= 'a') |
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| 244 | return(ch - 'a' + 38); |
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| 245 | if (ch > 'Z') |
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| 246 | return(0); |
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| 247 | if (ch >= 'A') |
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| 248 | return(ch - 'A' + 12); |
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| 249 | if (ch > '9') |
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| 250 | return(0); |
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| 251 | if (ch >= '.') |
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| 252 | return(ch - '.'); |
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| 253 | return(0); |
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| 254 | } |
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| 255 | |
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| 256 | struct Des_Context * |
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| 257 | des_ctx_init(void) |
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| 258 | { |
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| 259 | struct Des_Context *des_ctx; |
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| 260 | #ifdef REENTRANT |
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| 261 | des_ctx = malloc(sizeof(*des_ctx)); |
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| 262 | #else |
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| 263 | des_ctx = &single; |
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| 264 | #endif |
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| 265 | old_rawkey0 = old_rawkey1 = 0L; |
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| 266 | saltbits = 0L; |
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| 267 | old_salt = 0L; |
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| 268 | |
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| 269 | return des_ctx; |
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| 270 | } |
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| 271 | |
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| 272 | static void |
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| 273 | des_init(void) |
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| 274 | { |
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| 275 | int i, j, b, k, inbit, obit; |
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| 276 | u_int32_t *p, *il, *ir, *fl, *fr; |
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| 277 | static int des_initialised = 0; |
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| 278 | |
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| 279 | if (des_initialised==1) |
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| 280 | return; |
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| 281 | |
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| 282 | #ifndef REENTRANT |
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| 283 | des_ctx_init(); |
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| 284 | #endif |
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| 285 | |
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| 286 | bits24 = (bits28 = bits32 + 4) + 4; |
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| 287 | |
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| 288 | /* |
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| 289 | * Invert the S-boxes, reordering the input bits. |
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| 290 | */ |
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| 291 | for (i = 0; i < 8; i++) |
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| 292 | for (j = 0; j < 64; j++) { |
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| 293 | b = (j & 0x20) | ((j & 1) << 4) | ((j >> 1) & 0xf); |
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| 294 | u_sbox[i][j] = sbox[i][b]; |
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| 295 | } |
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| 296 | |
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| 297 | /* |
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| 298 | * Convert the inverted S-boxes into 4 arrays of 8 bits. |
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| 299 | * Each will handle 12 bits of the S-box input. |
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| 300 | */ |
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| 301 | for (b = 0; b < 4; b++) |
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| 302 | for (i = 0; i < 64; i++) |
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| 303 | for (j = 0; j < 64; j++) |
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| 304 | m_sbox[b][(i << 6) | j] = |
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| 305 | (u_char)((u_sbox[(b << 1)][i] << 4) | |
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| 306 | u_sbox[(b << 1) + 1][j]); |
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| 307 | |
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| 308 | /* |
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| 309 | * Set up the initial & final permutations into a useful form, and |
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| 310 | * initialise the inverted key permutation. |
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| 311 | */ |
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| 312 | for (i = 0; i < 64; i++) { |
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| 313 | init_perm[final_perm[i] = IP[i] - 1] = (u_char)i; |
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| 314 | inv_key_perm[i] = 255; |
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| 315 | } |
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| 316 | |
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| 317 | /* |
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| 318 | * Invert the key permutation and initialise the inverted key |
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| 319 | * compression permutation. |
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| 320 | */ |
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| 321 | for (i = 0; i < 56; i++) { |
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| 322 | inv_key_perm[key_perm[i] - 1] = (u_char)i; |
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| 323 | inv_comp_perm[i] = 255; |
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| 324 | } |
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| 325 | |
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| 326 | /* |
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| 327 | * Invert the key compression permutation. |
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| 328 | */ |
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| 329 | for (i = 0; i < 48; i++) { |
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| 330 | inv_comp_perm[comp_perm[i] - 1] = (u_char)i; |
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| 331 | } |
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| 332 | |
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| 333 | /* |
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| 334 | * Set up the OR-mask arrays for the initial and final permutations, |
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| 335 | * and for the key initial and compression permutations. |
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| 336 | */ |
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| 337 | for (k = 0; k < 8; k++) { |
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| 338 | for (i = 0; i < 256; i++) { |
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| 339 | *(il = &ip_maskl[k][i]) = 0L; |
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| 340 | *(ir = &ip_maskr[k][i]) = 0L; |
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| 341 | *(fl = &fp_maskl[k][i]) = 0L; |
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| 342 | *(fr = &fp_maskr[k][i]) = 0L; |
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| 343 | for (j = 0; j < 8; j++) { |
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| 344 | inbit = 8 * k + j; |
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| 345 | if (i & bits8[j]) { |
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| 346 | if ((obit = init_perm[inbit]) < 32) |
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| 347 | *il |= bits32[obit]; |
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| 348 | else |
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| 349 | *ir |= bits32[obit-32]; |
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| 350 | if ((obit = final_perm[inbit]) < 32) |
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| 351 | *fl |= bits32[obit]; |
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| 352 | else |
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| 353 | *fr |= bits32[obit - 32]; |
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| 354 | } |
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| 355 | } |
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| 356 | } |
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| 357 | for (i = 0; i < 128; i++) { |
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| 358 | *(il = &key_perm_maskl[k][i]) = 0L; |
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| 359 | *(ir = &key_perm_maskr[k][i]) = 0L; |
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| 360 | for (j = 0; j < 7; j++) { |
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| 361 | inbit = 8 * k + j; |
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| 362 | if (i & bits8[j + 1]) { |
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| 363 | if ((obit = inv_key_perm[inbit]) == 255) |
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| 364 | continue; |
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| 365 | if (obit < 28) |
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| 366 | *il |= bits28[obit]; |
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| 367 | else |
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| 368 | *ir |= bits28[obit - 28]; |
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| 369 | } |
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| 370 | } |
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| 371 | *(il = &comp_maskl[k][i]) = 0L; |
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| 372 | *(ir = &comp_maskr[k][i]) = 0L; |
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| 373 | for (j = 0; j < 7; j++) { |
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| 374 | inbit = 7 * k + j; |
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| 375 | if (i & bits8[j + 1]) { |
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| 376 | if ((obit=inv_comp_perm[inbit]) == 255) |
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| 377 | continue; |
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| 378 | if (obit < 24) |
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| 379 | *il |= bits24[obit]; |
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| 380 | else |
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| 381 | *ir |= bits24[obit - 24]; |
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| 382 | } |
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| 383 | } |
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| 384 | } |
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| 385 | } |
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| 386 | |
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| 387 | /* |
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| 388 | * Invert the P-box permutation, and convert into OR-masks for |
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| 389 | * handling the output of the S-box arrays setup above. |
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| 390 | */ |
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| 391 | for (i = 0; i < 32; i++) |
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| 392 | un_pbox[pbox[i] - 1] = (u_char)i; |
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| 393 | |
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| 394 | for (b = 0; b < 4; b++) |
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| 395 | for (i = 0; i < 256; i++) { |
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| 396 | *(p = &psbox[b][i]) = 0L; |
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| 397 | for (j = 0; j < 8; j++) { |
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| 398 | if (i & bits8[j]) |
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| 399 | *p |= bits32[un_pbox[8 * b + j]]; |
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| 400 | } |
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| 401 | } |
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| 402 | |
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| 403 | des_initialised = 1; |
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| 404 | } |
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| 405 | |
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| 406 | |
---|
| 407 | static void |
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| 408 | setup_salt(long salt, struct Des_Context *des_ctx) |
---|
| 409 | { |
---|
| 410 | u_int32_t obit, saltbit; |
---|
| 411 | int i; |
---|
| 412 | |
---|
| 413 | if (salt == old_salt) |
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| 414 | return; |
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| 415 | old_salt = salt; |
---|
| 416 | |
---|
| 417 | saltbits = 0L; |
---|
| 418 | saltbit = 1; |
---|
| 419 | obit = 0x800000; |
---|
| 420 | for (i = 0; i < 24; i++) { |
---|
| 421 | if (salt & saltbit) |
---|
| 422 | saltbits |= obit; |
---|
| 423 | saltbit <<= 1; |
---|
| 424 | obit >>= 1; |
---|
| 425 | } |
---|
| 426 | } |
---|
| 427 | |
---|
| 428 | |
---|
| 429 | static int |
---|
| 430 | des_setkey(const char *key, struct Des_Context *des_ctx) |
---|
| 431 | { |
---|
| 432 | u_int32_t k0, k1, rawkey0, rawkey1; |
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| 433 | int shifts, round; |
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| 434 | |
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| 435 | des_init(); |
---|
| 436 | |
---|
| 437 | rawkey0 = ntohl(*(const u_int32_t *) key); |
---|
| 438 | rawkey1 = ntohl(*(const u_int32_t *) (key + 4)); |
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| 439 | |
---|
| 440 | if ((rawkey0 | rawkey1) |
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| 441 | && rawkey0 == old_rawkey0 |
---|
| 442 | && rawkey1 == old_rawkey1) { |
---|
| 443 | /* |
---|
| 444 | * Already setup for this key. |
---|
| 445 | * This optimisation fails on a zero key (which is weak and |
---|
| 446 | * has bad parity anyway) in order to simplify the starting |
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| 447 | * conditions. |
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| 448 | */ |
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| 449 | return(0); |
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| 450 | } |
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| 451 | old_rawkey0 = rawkey0; |
---|
| 452 | old_rawkey1 = rawkey1; |
---|
| 453 | |
---|
| 454 | /* |
---|
| 455 | * Do key permutation and split into two 28-bit subkeys. |
---|
| 456 | */ |
---|
| 457 | k0 = key_perm_maskl[0][rawkey0 >> 25] |
---|
| 458 | | key_perm_maskl[1][(rawkey0 >> 17) & 0x7f] |
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| 459 | | key_perm_maskl[2][(rawkey0 >> 9) & 0x7f] |
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| 460 | | key_perm_maskl[3][(rawkey0 >> 1) & 0x7f] |
---|
| 461 | | key_perm_maskl[4][rawkey1 >> 25] |
---|
| 462 | | key_perm_maskl[5][(rawkey1 >> 17) & 0x7f] |
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| 463 | | key_perm_maskl[6][(rawkey1 >> 9) & 0x7f] |
---|
| 464 | | key_perm_maskl[7][(rawkey1 >> 1) & 0x7f]; |
---|
| 465 | k1 = key_perm_maskr[0][rawkey0 >> 25] |
---|
| 466 | | key_perm_maskr[1][(rawkey0 >> 17) & 0x7f] |
---|
| 467 | | key_perm_maskr[2][(rawkey0 >> 9) & 0x7f] |
---|
| 468 | | key_perm_maskr[3][(rawkey0 >> 1) & 0x7f] |
---|
| 469 | | key_perm_maskr[4][rawkey1 >> 25] |
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| 470 | | key_perm_maskr[5][(rawkey1 >> 17) & 0x7f] |
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| 471 | | key_perm_maskr[6][(rawkey1 >> 9) & 0x7f] |
---|
| 472 | | key_perm_maskr[7][(rawkey1 >> 1) & 0x7f]; |
---|
| 473 | /* |
---|
| 474 | * Rotate subkeys and do compression permutation. |
---|
| 475 | */ |
---|
| 476 | shifts = 0; |
---|
| 477 | for (round = 0; round < 16; round++) { |
---|
| 478 | u_int32_t t0, t1; |
---|
| 479 | |
---|
| 480 | shifts += key_shifts[round]; |
---|
| 481 | |
---|
| 482 | t0 = (k0 << shifts) | (k0 >> (28 - shifts)); |
---|
| 483 | t1 = (k1 << shifts) | (k1 >> (28 - shifts)); |
---|
| 484 | |
---|
| 485 | de_keysl[15 - round] = |
---|
| 486 | en_keysl[round] = comp_maskl[0][(t0 >> 21) & 0x7f] |
---|
| 487 | | comp_maskl[1][(t0 >> 14) & 0x7f] |
---|
| 488 | | comp_maskl[2][(t0 >> 7) & 0x7f] |
---|
| 489 | | comp_maskl[3][t0 & 0x7f] |
---|
| 490 | | comp_maskl[4][(t1 >> 21) & 0x7f] |
---|
| 491 | | comp_maskl[5][(t1 >> 14) & 0x7f] |
---|
| 492 | | comp_maskl[6][(t1 >> 7) & 0x7f] |
---|
| 493 | | comp_maskl[7][t1 & 0x7f]; |
---|
| 494 | |
---|
| 495 | de_keysr[15 - round] = |
---|
| 496 | en_keysr[round] = comp_maskr[0][(t0 >> 21) & 0x7f] |
---|
| 497 | | comp_maskr[1][(t0 >> 14) & 0x7f] |
---|
| 498 | | comp_maskr[2][(t0 >> 7) & 0x7f] |
---|
| 499 | | comp_maskr[3][t0 & 0x7f] |
---|
| 500 | | comp_maskr[4][(t1 >> 21) & 0x7f] |
---|
| 501 | | comp_maskr[5][(t1 >> 14) & 0x7f] |
---|
| 502 | | comp_maskr[6][(t1 >> 7) & 0x7f] |
---|
| 503 | | comp_maskr[7][t1 & 0x7f]; |
---|
| 504 | } |
---|
| 505 | return(0); |
---|
| 506 | } |
---|
| 507 | |
---|
| 508 | |
---|
| 509 | static int |
---|
| 510 | 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 Des_Context *des_ctx) |
---|
| 511 | { |
---|
| 512 | /* |
---|
| 513 | * l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format. |
---|
| 514 | */ |
---|
| 515 | u_int32_t l, r, *kl, *kr, *kl1, *kr1; |
---|
| 516 | u_int32_t f, r48l, r48r; |
---|
| 517 | int round; |
---|
| 518 | |
---|
| 519 | if (count == 0) { |
---|
| 520 | return(1); |
---|
| 521 | } else if (count > 0) { |
---|
| 522 | /* |
---|
| 523 | * Encrypting |
---|
| 524 | */ |
---|
| 525 | kl1 = en_keysl; |
---|
| 526 | kr1 = en_keysr; |
---|
| 527 | } else { |
---|
| 528 | /* |
---|
| 529 | * Decrypting |
---|
| 530 | */ |
---|
| 531 | count = -count; |
---|
| 532 | kl1 = de_keysl; |
---|
| 533 | kr1 = de_keysr; |
---|
| 534 | } |
---|
| 535 | |
---|
| 536 | /* |
---|
| 537 | * Do initial permutation (IP). |
---|
| 538 | */ |
---|
| 539 | l = ip_maskl[0][l_in >> 24] |
---|
| 540 | | ip_maskl[1][(l_in >> 16) & 0xff] |
---|
| 541 | | ip_maskl[2][(l_in >> 8) & 0xff] |
---|
| 542 | | ip_maskl[3][l_in & 0xff] |
---|
| 543 | | ip_maskl[4][r_in >> 24] |
---|
| 544 | | ip_maskl[5][(r_in >> 16) & 0xff] |
---|
| 545 | | ip_maskl[6][(r_in >> 8) & 0xff] |
---|
| 546 | | ip_maskl[7][r_in & 0xff]; |
---|
| 547 | r = ip_maskr[0][l_in >> 24] |
---|
| 548 | | ip_maskr[1][(l_in >> 16) & 0xff] |
---|
| 549 | | ip_maskr[2][(l_in >> 8) & 0xff] |
---|
| 550 | | ip_maskr[3][l_in & 0xff] |
---|
| 551 | | ip_maskr[4][r_in >> 24] |
---|
| 552 | | ip_maskr[5][(r_in >> 16) & 0xff] |
---|
| 553 | | ip_maskr[6][(r_in >> 8) & 0xff] |
---|
| 554 | | ip_maskr[7][r_in & 0xff]; |
---|
| 555 | |
---|
| 556 | while (count--) { |
---|
| 557 | /* |
---|
| 558 | * Do each round. |
---|
| 559 | */ |
---|
| 560 | kl = kl1; |
---|
| 561 | kr = kr1; |
---|
| 562 | round = 16; |
---|
| 563 | while (round--) { |
---|
| 564 | /* |
---|
| 565 | * Expand R to 48 bits (simulate the E-box). |
---|
| 566 | */ |
---|
| 567 | r48l = ((r & 0x00000001) << 23) |
---|
| 568 | | ((r & 0xf8000000) >> 9) |
---|
| 569 | | ((r & 0x1f800000) >> 11) |
---|
| 570 | | ((r & 0x01f80000) >> 13) |
---|
| 571 | | ((r & 0x001f8000) >> 15); |
---|
| 572 | |
---|
| 573 | r48r = ((r & 0x0001f800) << 7) |
---|
| 574 | | ((r & 0x00001f80) << 5) |
---|
| 575 | | ((r & 0x000001f8) << 3) |
---|
| 576 | | ((r & 0x0000001f) << 1) |
---|
| 577 | | ((r & 0x80000000) >> 31); |
---|
| 578 | /* |
---|
| 579 | * Do salting for crypt() and friends, and |
---|
| 580 | * XOR with the permuted key. |
---|
| 581 | */ |
---|
| 582 | f = (r48l ^ r48r) & saltbits; |
---|
| 583 | r48l ^= f ^ *kl++; |
---|
| 584 | r48r ^= f ^ *kr++; |
---|
| 585 | /* |
---|
| 586 | * Do sbox lookups (which shrink it back to 32 bits) |
---|
| 587 | * and do the pbox permutation at the same time. |
---|
| 588 | */ |
---|
| 589 | f = psbox[0][m_sbox[0][r48l >> 12]] |
---|
| 590 | | psbox[1][m_sbox[1][r48l & 0xfff]] |
---|
| 591 | | psbox[2][m_sbox[2][r48r >> 12]] |
---|
| 592 | | psbox[3][m_sbox[3][r48r & 0xfff]]; |
---|
| 593 | /* |
---|
| 594 | * Now that we've permuted things, complete f(). |
---|
| 595 | */ |
---|
| 596 | f ^= l; |
---|
| 597 | l = r; |
---|
| 598 | r = f; |
---|
| 599 | } |
---|
| 600 | r = l; |
---|
| 601 | l = f; |
---|
| 602 | } |
---|
| 603 | /* |
---|
| 604 | * Do final permutation (inverse of IP). |
---|
| 605 | */ |
---|
| 606 | *l_out = fp_maskl[0][l >> 24] |
---|
| 607 | | fp_maskl[1][(l >> 16) & 0xff] |
---|
| 608 | | fp_maskl[2][(l >> 8) & 0xff] |
---|
| 609 | | fp_maskl[3][l & 0xff] |
---|
| 610 | | fp_maskl[4][r >> 24] |
---|
| 611 | | fp_maskl[5][(r >> 16) & 0xff] |
---|
| 612 | | fp_maskl[6][(r >> 8) & 0xff] |
---|
| 613 | | fp_maskl[7][r & 0xff]; |
---|
| 614 | *r_out = fp_maskr[0][l >> 24] |
---|
| 615 | | fp_maskr[1][(l >> 16) & 0xff] |
---|
| 616 | | fp_maskr[2][(l >> 8) & 0xff] |
---|
| 617 | | fp_maskr[3][l & 0xff] |
---|
| 618 | | fp_maskr[4][r >> 24] |
---|
| 619 | | fp_maskr[5][(r >> 16) & 0xff] |
---|
| 620 | | fp_maskr[6][(r >> 8) & 0xff] |
---|
| 621 | | fp_maskr[7][r & 0xff]; |
---|
| 622 | return(0); |
---|
| 623 | } |
---|
| 624 | |
---|
| 625 | |
---|
| 626 | #if 0 |
---|
| 627 | static int |
---|
| 628 | des_cipher(const char *in, char *out, u_int32_t salt, int count) |
---|
| 629 | { |
---|
| 630 | u_int32_t l_out, r_out, rawl, rawr; |
---|
| 631 | int retval; |
---|
| 632 | union { |
---|
| 633 | u_int32_t *ui32; |
---|
| 634 | const char *c; |
---|
| 635 | } trans; |
---|
| 636 | |
---|
| 637 | des_init(); |
---|
| 638 | |
---|
| 639 | setup_salt(salt); |
---|
| 640 | |
---|
| 641 | trans.c = in; |
---|
| 642 | rawl = ntohl(*trans.ui32++); |
---|
| 643 | rawr = ntohl(*trans.ui32); |
---|
| 644 | |
---|
| 645 | retval = do_des(rawl, rawr, &l_out, &r_out, count); |
---|
| 646 | |
---|
| 647 | trans.c = out; |
---|
| 648 | *trans.ui32++ = htonl(l_out); |
---|
| 649 | *trans.ui32 = htonl(r_out); |
---|
| 650 | return(retval); |
---|
| 651 | } |
---|
| 652 | #endif |
---|
| 653 | |
---|
| 654 | |
---|
| 655 | #ifndef REENTRANT |
---|
| 656 | void |
---|
| 657 | setkey(const char *key) |
---|
| 658 | { |
---|
| 659 | int i, j; |
---|
| 660 | u_int32_t packed_keys[2]; |
---|
| 661 | u_char *p; |
---|
| 662 | |
---|
| 663 | p = (u_char *) packed_keys; |
---|
| 664 | |
---|
| 665 | for (i = 0; i < 8; i++) { |
---|
| 666 | p[i] = 0; |
---|
| 667 | for (j = 0; j < 8; j++) |
---|
| 668 | if (*key++ & 1) |
---|
| 669 | p[i] |= bits8[j]; |
---|
| 670 | } |
---|
| 671 | des_setkey(p, &single); |
---|
| 672 | } |
---|
| 673 | #endif |
---|
| 674 | |
---|
| 675 | |
---|
| 676 | #ifndef REENTRANT |
---|
| 677 | void |
---|
| 678 | encrypt(char *block, int flag) |
---|
| 679 | { |
---|
| 680 | u_int32_t io[2]; |
---|
| 681 | u_char *p; |
---|
| 682 | int i, j; |
---|
| 683 | |
---|
| 684 | des_init(); |
---|
| 685 | |
---|
| 686 | setup_salt(0L, &single); |
---|
| 687 | p = block; |
---|
| 688 | for (i = 0; i < 2; i++) { |
---|
| 689 | io[i] = 0L; |
---|
| 690 | for (j = 0; j < 32; j++) |
---|
| 691 | if (*p++ & 1) |
---|
| 692 | io[i] |= bits32[j]; |
---|
| 693 | } |
---|
| 694 | do_des(io[0], io[1], io, io + 1, flag ? -1 : 1, &single); |
---|
| 695 | for (i = 0; i < 2; i++) |
---|
| 696 | for (j = 0; j < 32; j++) |
---|
| 697 | block[(i << 5) | j] = (io[i] & bits32[j]) ? 1 : 0; |
---|
| 698 | } |
---|
| 699 | |
---|
| 700 | #endif |
---|
| 701 | |
---|
| 702 | char * |
---|
| 703 | __des_crypt_r(const char *key, const char *setting, char *output, int sz) |
---|
| 704 | { |
---|
| 705 | char *rval = 0; |
---|
| 706 | struct Des_Context *des_ctx; |
---|
| 707 | u_int32_t count, salt, l, r0, r1, keybuf[2]; |
---|
| 708 | u_char *p, *q; |
---|
| 709 | |
---|
| 710 | if (sz < 21) |
---|
| 711 | return NULL; |
---|
| 712 | |
---|
| 713 | des_init(); |
---|
| 714 | des_ctx = des_ctx_init(); |
---|
| 715 | |
---|
| 716 | /* |
---|
| 717 | * Copy the key, shifting each character up by one bit |
---|
| 718 | * and padding with zeros. |
---|
| 719 | */ |
---|
| 720 | q = (u_char *)keybuf; |
---|
| 721 | while (q - (u_char *)keybuf - 8) { |
---|
| 722 | *q++ = *key << 1; |
---|
| 723 | if (*(q - 1)) |
---|
| 724 | key++; |
---|
| 725 | } |
---|
| 726 | if (des_setkey((char *)keybuf, des_ctx)) |
---|
| 727 | goto bailout; |
---|
| 728 | |
---|
| 729 | #if 0 |
---|
| 730 | if (*setting == _PASSWORD_EFMT1) { |
---|
| 731 | int i; |
---|
| 732 | /* |
---|
| 733 | * "new"-style: |
---|
| 734 | * setting - underscore, 4 bytes of count, 4 bytes of salt |
---|
| 735 | * key - unlimited characters |
---|
| 736 | */ |
---|
| 737 | for (i = 1, count = 0L; i < 5; i++) |
---|
| 738 | count |= ascii_to_bin(setting[i]) << ((i - 1) * 6); |
---|
| 739 | |
---|
| 740 | for (i = 5, salt = 0L; i < 9; i++) |
---|
| 741 | salt |= ascii_to_bin(setting[i]) << ((i - 5) * 6); |
---|
| 742 | |
---|
| 743 | while (*key) { |
---|
| 744 | /* |
---|
| 745 | * Encrypt the key with itself. |
---|
| 746 | */ |
---|
| 747 | if (des_cipher((char *)keybuf, (char *)keybuf, 0L, 1)) |
---|
| 748 | goto bailout; |
---|
| 749 | /* |
---|
| 750 | * And XOR with the next 8 characters of the key. |
---|
| 751 | */ |
---|
| 752 | q = (u_char *)keybuf; |
---|
| 753 | while (q - (u_char *)keybuf - 8 && *key) |
---|
| 754 | *q++ ^= *key++ << 1; |
---|
| 755 | |
---|
| 756 | if (des_setkey((char *)keybuf)) |
---|
| 757 | goto bailout; |
---|
| 758 | } |
---|
| 759 | strncpy(output, setting, 9); |
---|
| 760 | |
---|
| 761 | /* |
---|
| 762 | * Double check that we weren't given a short setting. |
---|
| 763 | * If we were, the above code will probably have created |
---|
| 764 | * wierd values for count and salt, but we don't really care. |
---|
| 765 | * Just make sure the output string doesn't have an extra |
---|
| 766 | * NUL in it. |
---|
| 767 | */ |
---|
| 768 | output[9] = '\0'; |
---|
| 769 | p = (u_char *)output + strlen(output); |
---|
| 770 | } else |
---|
| 771 | #endif |
---|
| 772 | { |
---|
| 773 | /* |
---|
| 774 | * "old"-style: |
---|
| 775 | * setting - 2 bytes of salt |
---|
| 776 | * key - up to 8 characters |
---|
| 777 | */ |
---|
| 778 | count = 25; |
---|
| 779 | |
---|
| 780 | salt = (ascii_to_bin(setting[1]) << 6) |
---|
| 781 | | ascii_to_bin(setting[0]); |
---|
| 782 | |
---|
| 783 | output[0] = setting[0]; |
---|
| 784 | /* |
---|
| 785 | * If the encrypted password that the salt was extracted from |
---|
| 786 | * is only 1 character long, the salt will be corrupted. We |
---|
| 787 | * need to ensure that the output string doesn't have an extra |
---|
| 788 | * NUL in it! |
---|
| 789 | */ |
---|
| 790 | output[1] = setting[1] ? setting[1] : output[0]; |
---|
| 791 | |
---|
| 792 | p = (u_char *)output + 2; |
---|
| 793 | } |
---|
| 794 | setup_salt(salt, des_ctx); |
---|
| 795 | /* |
---|
| 796 | * Do it. |
---|
| 797 | */ |
---|
| 798 | if (do_des(0L, 0L, &r0, &r1, (int)count, des_ctx)) |
---|
| 799 | goto bailout; |
---|
| 800 | /* |
---|
| 801 | * Now encode the result... |
---|
| 802 | */ |
---|
| 803 | l = (r0 >> 8); |
---|
| 804 | *p++ = ascii64[(l >> 18) & 0x3f]; |
---|
| 805 | *p++ = ascii64[(l >> 12) & 0x3f]; |
---|
| 806 | *p++ = ascii64[(l >> 6) & 0x3f]; |
---|
| 807 | *p++ = ascii64[l & 0x3f]; |
---|
| 808 | |
---|
| 809 | l = (r0 << 16) | ((r1 >> 16) & 0xffff); |
---|
| 810 | *p++ = ascii64[(l >> 18) & 0x3f]; |
---|
| 811 | *p++ = ascii64[(l >> 12) & 0x3f]; |
---|
| 812 | *p++ = ascii64[(l >> 6) & 0x3f]; |
---|
| 813 | *p++ = ascii64[l & 0x3f]; |
---|
| 814 | |
---|
| 815 | l = r1 << 2; |
---|
| 816 | *p++ = ascii64[(l >> 12) & 0x3f]; |
---|
| 817 | *p++ = ascii64[(l >> 6) & 0x3f]; |
---|
| 818 | *p++ = ascii64[l & 0x3f]; |
---|
| 819 | *p = 0; |
---|
| 820 | |
---|
| 821 | rval = output; |
---|
| 822 | bailout: |
---|
| 823 | free(des_ctx); |
---|
| 824 | return rval; |
---|
| 825 | } |
---|
| 826 | |
---|
| 827 | char * |
---|
| 828 | __des_crypt(const char *key, const char *setting) |
---|
| 829 | { |
---|
| 830 | static char output[21]; |
---|
| 831 | return __des_crypt_r(key, setting, output, sizeof(output)); |
---|
| 832 | } |
---|
| 833 | |
---|
| 834 | |
---|
| 835 | #ifdef DEBUG |
---|
| 836 | |
---|
| 837 | void |
---|
| 838 | des_snap(void **pf, void **pd) |
---|
| 839 | { |
---|
| 840 | *pf = malloc(sizeof(struct fixed)); |
---|
| 841 | memcpy(*pf, &des_f, sizeof(des_f)); |
---|
| 842 | // *pd = malloc(sizeof(struct Des_Context)); |
---|
| 843 | // memcpy(*pd, &des_ctx, sizeof(des_ctx)); |
---|
| 844 | } |
---|
| 845 | |
---|
| 846 | void |
---|
| 847 | des_check(void *pf, void *pd) |
---|
| 848 | { |
---|
| 849 | printf("Fixed: do%s differ"/*", Context: do%s differ"*/"\n", |
---|
| 850 | memcmp(pf, &des_f, sizeof(des_f)) ? "" : "nt" |
---|
| 851 | // ,memcmp(pd, &des_ctx, sizeof(des_ctx)) ? "" : "nt" |
---|
| 852 | ); |
---|
| 853 | } |
---|
| 854 | |
---|
| 855 | #endif |
---|