des-internal.c
Go to the documentation of this file.
00001 /*
00002  * DES and 3DES-EDE ciphers
00003  *
00004  * Modifications to LibTomCrypt implementation:
00005  * Copyright (c) 2006-2009, Jouni Malinen <j@w1.fi>
00006  *
00007  * This program is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License version 2 as
00009  * published by the Free Software Foundation.
00010  *
00011  * Alternatively, this software may be distributed under the terms of BSD
00012  * license.
00013  *
00014  * See README and COPYING for more details.
00015  */
00016 
00017 #include "includes.h"
00018 
00019 #include "common.h"
00020 #include "crypto.h"
00021 #include "des_i.h"
00022 
00023 /*
00024  * This implementation is based on a DES implementation included in
00025  * LibTomCrypt. The version here is modified to fit in wpa_supplicant/hostapd
00026  * coding style.
00027  */
00028 
00029 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
00030  *
00031  * LibTomCrypt is a library that provides various cryptographic
00032  * algorithms in a highly modular and flexible manner.
00033  *
00034  * The library is free for all purposes without any express
00035  * guarantee it works.
00036  *
00037  * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
00038  */
00039 
00044 #define ROLc(x, y) \
00045         ((((unsigned long) (x) << (unsigned long) ((y) & 31)) | \
00046           (((unsigned long) (x) & 0xFFFFFFFFUL) >> \
00047            (unsigned long) (32 - ((y) & 31)))) & 0xFFFFFFFFUL)
00048 #define RORc(x, y) \
00049         (((((unsigned long) (x) & 0xFFFFFFFFUL) >> \
00050            (unsigned long) ((y) & 31)) | \
00051           ((unsigned long) (x) << (unsigned long) (32 - ((y) & 31)))) & \
00052          0xFFFFFFFFUL)
00053 
00054 
00055 static const u32 bytebit[8] =
00056 {
00057         0200, 0100, 040, 020, 010, 04, 02, 01 
00058 };
00059 
00060 static const u32 bigbyte[24] =
00061 {
00062         0x800000UL,  0x400000UL,  0x200000UL,  0x100000UL,
00063         0x80000UL,   0x40000UL,   0x20000UL,   0x10000UL,
00064         0x8000UL,    0x4000UL,    0x2000UL,    0x1000UL,
00065         0x800UL,     0x400UL,     0x200UL,     0x100UL,
00066         0x80UL,      0x40UL,      0x20UL,      0x10UL,
00067         0x8UL,       0x4UL,       0x2UL,       0x1L 
00068 };
00069 
00070 /* Use the key schedule specific in the standard (ANSI X3.92-1981) */
00071 
00072 static const u8 pc1[56] = {
00073         56, 48, 40, 32, 24, 16,  8,  0, 57, 49, 41, 33, 25, 17,  
00074          9,  1, 58, 50, 42, 34, 26, 18, 10,  2, 59, 51, 43, 35, 
00075         62, 54, 46, 38, 30, 22, 14,  6, 61, 53, 45, 37, 29, 21,
00076         13,  5, 60, 52, 44, 36, 28, 20, 12,  4, 27, 19, 11,  3 
00077 };
00078 
00079 static const u8 totrot[16] = {
00080         1,   2,  4,  6,
00081         8,  10, 12, 14, 
00082         15, 17, 19, 21, 
00083         23, 25, 27, 28
00084 };
00085 
00086 static const u8 pc2[48] = {
00087         13, 16, 10, 23,  0,  4,      2, 27, 14,  5, 20,  9,
00088         22, 18, 11,  3, 25,  7,     15,  6, 26, 19, 12,  1,
00089         40, 51, 30, 36, 46, 54,     29, 39, 50, 44, 32, 47,
00090         43, 48, 38, 55, 33, 52,     45, 41, 49, 35, 28, 31
00091 };
00092 
00093 
00094 static const u32 SP1[64] =
00095 {
00096         0x01010400UL, 0x00000000UL, 0x00010000UL, 0x01010404UL,
00097         0x01010004UL, 0x00010404UL, 0x00000004UL, 0x00010000UL,
00098         0x00000400UL, 0x01010400UL, 0x01010404UL, 0x00000400UL,
00099         0x01000404UL, 0x01010004UL, 0x01000000UL, 0x00000004UL,
00100         0x00000404UL, 0x01000400UL, 0x01000400UL, 0x00010400UL,
00101         0x00010400UL, 0x01010000UL, 0x01010000UL, 0x01000404UL,
00102         0x00010004UL, 0x01000004UL, 0x01000004UL, 0x00010004UL,
00103         0x00000000UL, 0x00000404UL, 0x00010404UL, 0x01000000UL,
00104         0x00010000UL, 0x01010404UL, 0x00000004UL, 0x01010000UL,
00105         0x01010400UL, 0x01000000UL, 0x01000000UL, 0x00000400UL,
00106         0x01010004UL, 0x00010000UL, 0x00010400UL, 0x01000004UL,
00107         0x00000400UL, 0x00000004UL, 0x01000404UL, 0x00010404UL,
00108         0x01010404UL, 0x00010004UL, 0x01010000UL, 0x01000404UL,
00109         0x01000004UL, 0x00000404UL, 0x00010404UL, 0x01010400UL,
00110         0x00000404UL, 0x01000400UL, 0x01000400UL, 0x00000000UL,
00111         0x00010004UL, 0x00010400UL, 0x00000000UL, 0x01010004UL
00112 };
00113 
00114 static const u32 SP2[64] =
00115 {
00116         0x80108020UL, 0x80008000UL, 0x00008000UL, 0x00108020UL,
00117         0x00100000UL, 0x00000020UL, 0x80100020UL, 0x80008020UL,
00118         0x80000020UL, 0x80108020UL, 0x80108000UL, 0x80000000UL,
00119         0x80008000UL, 0x00100000UL, 0x00000020UL, 0x80100020UL,
00120         0x00108000UL, 0x00100020UL, 0x80008020UL, 0x00000000UL,
00121         0x80000000UL, 0x00008000UL, 0x00108020UL, 0x80100000UL,
00122         0x00100020UL, 0x80000020UL, 0x00000000UL, 0x00108000UL,
00123         0x00008020UL, 0x80108000UL, 0x80100000UL, 0x00008020UL,
00124         0x00000000UL, 0x00108020UL, 0x80100020UL, 0x00100000UL,
00125         0x80008020UL, 0x80100000UL, 0x80108000UL, 0x00008000UL,
00126         0x80100000UL, 0x80008000UL, 0x00000020UL, 0x80108020UL,
00127         0x00108020UL, 0x00000020UL, 0x00008000UL, 0x80000000UL,
00128         0x00008020UL, 0x80108000UL, 0x00100000UL, 0x80000020UL,
00129         0x00100020UL, 0x80008020UL, 0x80000020UL, 0x00100020UL,
00130         0x00108000UL, 0x00000000UL, 0x80008000UL, 0x00008020UL,
00131         0x80000000UL, 0x80100020UL, 0x80108020UL, 0x00108000UL
00132 };
00133 
00134 static const u32 SP3[64] =
00135 {
00136         0x00000208UL, 0x08020200UL, 0x00000000UL, 0x08020008UL,
00137         0x08000200UL, 0x00000000UL, 0x00020208UL, 0x08000200UL,
00138         0x00020008UL, 0x08000008UL, 0x08000008UL, 0x00020000UL,
00139         0x08020208UL, 0x00020008UL, 0x08020000UL, 0x00000208UL,
00140         0x08000000UL, 0x00000008UL, 0x08020200UL, 0x00000200UL,
00141         0x00020200UL, 0x08020000UL, 0x08020008UL, 0x00020208UL,
00142         0x08000208UL, 0x00020200UL, 0x00020000UL, 0x08000208UL,
00143         0x00000008UL, 0x08020208UL, 0x00000200UL, 0x08000000UL,
00144         0x08020200UL, 0x08000000UL, 0x00020008UL, 0x00000208UL,
00145         0x00020000UL, 0x08020200UL, 0x08000200UL, 0x00000000UL,
00146         0x00000200UL, 0x00020008UL, 0x08020208UL, 0x08000200UL,
00147         0x08000008UL, 0x00000200UL, 0x00000000UL, 0x08020008UL,
00148         0x08000208UL, 0x00020000UL, 0x08000000UL, 0x08020208UL,
00149         0x00000008UL, 0x00020208UL, 0x00020200UL, 0x08000008UL,
00150         0x08020000UL, 0x08000208UL, 0x00000208UL, 0x08020000UL,
00151         0x00020208UL, 0x00000008UL, 0x08020008UL, 0x00020200UL
00152 };
00153 
00154 static const u32 SP4[64] =
00155 {
00156         0x00802001UL, 0x00002081UL, 0x00002081UL, 0x00000080UL,
00157         0x00802080UL, 0x00800081UL, 0x00800001UL, 0x00002001UL,
00158         0x00000000UL, 0x00802000UL, 0x00802000UL, 0x00802081UL,
00159         0x00000081UL, 0x00000000UL, 0x00800080UL, 0x00800001UL,
00160         0x00000001UL, 0x00002000UL, 0x00800000UL, 0x00802001UL,
00161         0x00000080UL, 0x00800000UL, 0x00002001UL, 0x00002080UL,
00162         0x00800081UL, 0x00000001UL, 0x00002080UL, 0x00800080UL,
00163         0x00002000UL, 0x00802080UL, 0x00802081UL, 0x00000081UL,
00164         0x00800080UL, 0x00800001UL, 0x00802000UL, 0x00802081UL,
00165         0x00000081UL, 0x00000000UL, 0x00000000UL, 0x00802000UL,
00166         0x00002080UL, 0x00800080UL, 0x00800081UL, 0x00000001UL,
00167         0x00802001UL, 0x00002081UL, 0x00002081UL, 0x00000080UL,
00168         0x00802081UL, 0x00000081UL, 0x00000001UL, 0x00002000UL,
00169         0x00800001UL, 0x00002001UL, 0x00802080UL, 0x00800081UL,
00170         0x00002001UL, 0x00002080UL, 0x00800000UL, 0x00802001UL,
00171         0x00000080UL, 0x00800000UL, 0x00002000UL, 0x00802080UL
00172 };
00173 
00174 static const u32 SP5[64] =
00175 {
00176         0x00000100UL, 0x02080100UL, 0x02080000UL, 0x42000100UL,
00177         0x00080000UL, 0x00000100UL, 0x40000000UL, 0x02080000UL,
00178         0x40080100UL, 0x00080000UL, 0x02000100UL, 0x40080100UL,
00179         0x42000100UL, 0x42080000UL, 0x00080100UL, 0x40000000UL,
00180         0x02000000UL, 0x40080000UL, 0x40080000UL, 0x00000000UL,
00181         0x40000100UL, 0x42080100UL, 0x42080100UL, 0x02000100UL,
00182         0x42080000UL, 0x40000100UL, 0x00000000UL, 0x42000000UL,
00183         0x02080100UL, 0x02000000UL, 0x42000000UL, 0x00080100UL,
00184         0x00080000UL, 0x42000100UL, 0x00000100UL, 0x02000000UL,
00185         0x40000000UL, 0x02080000UL, 0x42000100UL, 0x40080100UL,
00186         0x02000100UL, 0x40000000UL, 0x42080000UL, 0x02080100UL,
00187         0x40080100UL, 0x00000100UL, 0x02000000UL, 0x42080000UL,
00188         0x42080100UL, 0x00080100UL, 0x42000000UL, 0x42080100UL,
00189         0x02080000UL, 0x00000000UL, 0x40080000UL, 0x42000000UL,
00190         0x00080100UL, 0x02000100UL, 0x40000100UL, 0x00080000UL,
00191         0x00000000UL, 0x40080000UL, 0x02080100UL, 0x40000100UL
00192 };
00193 
00194 static const u32 SP6[64] =
00195 {
00196         0x20000010UL, 0x20400000UL, 0x00004000UL, 0x20404010UL,
00197         0x20400000UL, 0x00000010UL, 0x20404010UL, 0x00400000UL,
00198         0x20004000UL, 0x00404010UL, 0x00400000UL, 0x20000010UL,
00199         0x00400010UL, 0x20004000UL, 0x20000000UL, 0x00004010UL,
00200         0x00000000UL, 0x00400010UL, 0x20004010UL, 0x00004000UL,
00201         0x00404000UL, 0x20004010UL, 0x00000010UL, 0x20400010UL,
00202         0x20400010UL, 0x00000000UL, 0x00404010UL, 0x20404000UL,
00203         0x00004010UL, 0x00404000UL, 0x20404000UL, 0x20000000UL,
00204         0x20004000UL, 0x00000010UL, 0x20400010UL, 0x00404000UL,
00205         0x20404010UL, 0x00400000UL, 0x00004010UL, 0x20000010UL,
00206         0x00400000UL, 0x20004000UL, 0x20000000UL, 0x00004010UL,
00207         0x20000010UL, 0x20404010UL, 0x00404000UL, 0x20400000UL,
00208         0x00404010UL, 0x20404000UL, 0x00000000UL, 0x20400010UL,
00209         0x00000010UL, 0x00004000UL, 0x20400000UL, 0x00404010UL,
00210         0x00004000UL, 0x00400010UL, 0x20004010UL, 0x00000000UL,
00211         0x20404000UL, 0x20000000UL, 0x00400010UL, 0x20004010UL
00212 };
00213 
00214 static const u32 SP7[64] =
00215 {
00216         0x00200000UL, 0x04200002UL, 0x04000802UL, 0x00000000UL,
00217         0x00000800UL, 0x04000802UL, 0x00200802UL, 0x04200800UL,
00218         0x04200802UL, 0x00200000UL, 0x00000000UL, 0x04000002UL,
00219         0x00000002UL, 0x04000000UL, 0x04200002UL, 0x00000802UL,
00220         0x04000800UL, 0x00200802UL, 0x00200002UL, 0x04000800UL,
00221         0x04000002UL, 0x04200000UL, 0x04200800UL, 0x00200002UL,
00222         0x04200000UL, 0x00000800UL, 0x00000802UL, 0x04200802UL,
00223         0x00200800UL, 0x00000002UL, 0x04000000UL, 0x00200800UL,
00224         0x04000000UL, 0x00200800UL, 0x00200000UL, 0x04000802UL,
00225         0x04000802UL, 0x04200002UL, 0x04200002UL, 0x00000002UL,
00226         0x00200002UL, 0x04000000UL, 0x04000800UL, 0x00200000UL,
00227         0x04200800UL, 0x00000802UL, 0x00200802UL, 0x04200800UL,
00228         0x00000802UL, 0x04000002UL, 0x04200802UL, 0x04200000UL,
00229         0x00200800UL, 0x00000000UL, 0x00000002UL, 0x04200802UL,
00230         0x00000000UL, 0x00200802UL, 0x04200000UL, 0x00000800UL,
00231         0x04000002UL, 0x04000800UL, 0x00000800UL, 0x00200002UL
00232 };
00233 
00234 static const u32 SP8[64] =
00235 {
00236         0x10001040UL, 0x00001000UL, 0x00040000UL, 0x10041040UL,
00237         0x10000000UL, 0x10001040UL, 0x00000040UL, 0x10000000UL,
00238         0x00040040UL, 0x10040000UL, 0x10041040UL, 0x00041000UL,
00239         0x10041000UL, 0x00041040UL, 0x00001000UL, 0x00000040UL,
00240         0x10040000UL, 0x10000040UL, 0x10001000UL, 0x00001040UL,
00241         0x00041000UL, 0x00040040UL, 0x10040040UL, 0x10041000UL,
00242         0x00001040UL, 0x00000000UL, 0x00000000UL, 0x10040040UL,
00243         0x10000040UL, 0x10001000UL, 0x00041040UL, 0x00040000UL,
00244         0x00041040UL, 0x00040000UL, 0x10041000UL, 0x00001000UL,
00245         0x00000040UL, 0x10040040UL, 0x00001000UL, 0x00041040UL,
00246         0x10001000UL, 0x00000040UL, 0x10000040UL, 0x10040000UL,
00247         0x10040040UL, 0x10000000UL, 0x00040000UL, 0x10001040UL,
00248         0x00000000UL, 0x10041040UL, 0x00040040UL, 0x10000040UL,
00249         0x10040000UL, 0x10001000UL, 0x10001040UL, 0x00000000UL,
00250         0x10041040UL, 0x00041000UL, 0x00041000UL, 0x00001040UL,
00251         0x00001040UL, 0x00040040UL, 0x10000000UL, 0x10041000UL
00252 };
00253 
00254 
00255 static void cookey(const u32 *raw1, u32 *keyout)
00256 {
00257         u32 *cook;
00258         const u32 *raw0;
00259         u32 dough[32];
00260         int i;
00261 
00262         cook = dough;
00263         for (i = 0; i < 16; i++, raw1++) {
00264                 raw0 = raw1++;
00265                 *cook    = (*raw0 & 0x00fc0000L) << 6;
00266                 *cook   |= (*raw0 & 0x00000fc0L) << 10;
00267                 *cook   |= (*raw1 & 0x00fc0000L) >> 10;
00268                 *cook++ |= (*raw1 & 0x00000fc0L) >> 6;
00269                 *cook    = (*raw0 & 0x0003f000L) << 12;
00270                 *cook   |= (*raw0 & 0x0000003fL) << 16;
00271                 *cook   |= (*raw1 & 0x0003f000L) >> 4;
00272                 *cook++ |= (*raw1 & 0x0000003fL);
00273         }
00274 
00275         os_memcpy(keyout, dough, sizeof(dough));
00276 }
00277 
00278 
00279 static void deskey(const u8 *key, int decrypt, u32 *keyout)
00280 {
00281         u32 i, j, l, m, n, kn[32];
00282         u8 pc1m[56], pcr[56];
00283 
00284         for (j = 0; j < 56; j++) {
00285                 l = (u32) pc1[j];
00286                 m = l & 7;
00287                 pc1m[j] = (u8)
00288                         ((key[l >> 3U] & bytebit[m]) == bytebit[m] ? 1 : 0);
00289         }
00290 
00291         for (i = 0; i < 16; i++) {
00292                 if (decrypt)
00293                         m = (15 - i) << 1;
00294                 else
00295                         m = i << 1;
00296                 n = m + 1;
00297                 kn[m] = kn[n] = 0L;
00298                 for (j = 0; j < 28; j++) {
00299                         l = j + (u32) totrot[i];
00300                         if (l < 28)
00301                                 pcr[j] = pc1m[l];
00302                         else
00303                                 pcr[j] = pc1m[l - 28];
00304                 }
00305                 for (/* j = 28 */; j < 56; j++) {
00306                         l = j + (u32) totrot[i];
00307                         if (l < 56)
00308                                 pcr[j] = pc1m[l];
00309                         else
00310                                 pcr[j] = pc1m[l - 28];
00311                 }
00312                 for (j = 0; j < 24; j++) {
00313                         if ((int) pcr[(int) pc2[j]] != 0)
00314                                 kn[m] |= bigbyte[j];
00315                         if ((int) pcr[(int) pc2[j + 24]] != 0)
00316                                 kn[n] |= bigbyte[j];
00317                 }
00318         }
00319 
00320         cookey(kn, keyout);
00321 }
00322 
00323 
00324 static void desfunc(u32 *block, const u32 *keys)
00325 {
00326         u32 work, right, leftt;
00327         int cur_round;
00328 
00329         leftt = block[0];
00330         right = block[1];
00331 
00332         work = ((leftt >> 4)  ^ right) & 0x0f0f0f0fL;
00333         right ^= work;
00334         leftt ^= (work << 4);
00335 
00336         work = ((leftt >> 16) ^ right) & 0x0000ffffL;
00337         right ^= work;
00338         leftt ^= (work << 16);
00339 
00340         work = ((right >> 2)  ^ leftt) & 0x33333333L;
00341         leftt ^= work;
00342         right ^= (work << 2);
00343 
00344         work = ((right >> 8)  ^ leftt) & 0x00ff00ffL;
00345         leftt ^= work;
00346         right ^= (work << 8);
00347 
00348         right = ROLc(right, 1);
00349         work = (leftt ^ right) & 0xaaaaaaaaL;
00350 
00351         leftt ^= work;
00352         right ^= work;
00353         leftt = ROLc(leftt, 1);
00354 
00355         for (cur_round = 0; cur_round < 8; cur_round++) {
00356                 work  = RORc(right, 4) ^ *keys++;
00357                 leftt ^= SP7[work        & 0x3fL]
00358                         ^ SP5[(work >>  8) & 0x3fL]
00359                         ^ SP3[(work >> 16) & 0x3fL]
00360                         ^ SP1[(work >> 24) & 0x3fL];
00361                 work  = right ^ *keys++;
00362                 leftt ^= SP8[ work        & 0x3fL]
00363                         ^  SP6[(work >>  8) & 0x3fL]
00364                         ^  SP4[(work >> 16) & 0x3fL]
00365                         ^  SP2[(work >> 24) & 0x3fL];
00366 
00367                 work = RORc(leftt, 4) ^ *keys++;
00368                 right ^= SP7[ work        & 0x3fL]
00369                         ^  SP5[(work >>  8) & 0x3fL]
00370                         ^  SP3[(work >> 16) & 0x3fL]
00371                         ^  SP1[(work >> 24) & 0x3fL];
00372                 work  = leftt ^ *keys++;
00373                 right ^= SP8[ work        & 0x3fL]
00374                         ^  SP6[(work >>  8) & 0x3fL]
00375                         ^  SP4[(work >> 16) & 0x3fL]
00376                         ^  SP2[(work >> 24) & 0x3fL];
00377         }
00378 
00379         right = RORc(right, 1);
00380         work = (leftt ^ right) & 0xaaaaaaaaL;
00381         leftt ^= work;
00382         right ^= work;
00383         leftt = RORc(leftt, 1);
00384         work = ((leftt >> 8) ^ right) & 0x00ff00ffL;
00385         right ^= work;
00386         leftt ^= (work << 8);
00387         /* -- */
00388         work = ((leftt >> 2) ^ right) & 0x33333333L;
00389         right ^= work;
00390         leftt ^= (work << 2);
00391         work = ((right >> 16) ^ leftt) & 0x0000ffffL;
00392         leftt ^= work;
00393         right ^= (work << 16);
00394         work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL;
00395         leftt ^= work;
00396         right ^= (work << 4);
00397 
00398         block[0] = right;
00399         block[1] = leftt;
00400 }
00401 
00402 
00403 /* wpa_supplicant/hostapd specific wrapper */
00404 
00405 void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
00406 {
00407         u8 pkey[8], next, tmp;
00408         int i;
00409         u32 ek[32], work[2];
00410 
00411         /* Add parity bits to the key */
00412         next = 0;
00413         for (i = 0; i < 7; i++) {
00414                 tmp = key[i];
00415                 pkey[i] = (tmp >> i) | next | 1;
00416                 next = tmp << (7 - i);
00417         }
00418         pkey[i] = next | 1;
00419 
00420         deskey(pkey, 0, ek);
00421 
00422         work[0] = WPA_GET_BE32(clear);
00423         work[1] = WPA_GET_BE32(clear + 4);
00424         desfunc(work, ek);
00425         WPA_PUT_BE32(cypher, work[0]);
00426         WPA_PUT_BE32(cypher + 4, work[1]);
00427 
00428         os_memset(pkey, 0, sizeof(pkey));
00429         os_memset(ek, 0, sizeof(ek));
00430 }
00431 
00432 
00433 void des_key_setup(const u8 *key, u32 *ek, u32 *dk)
00434 {
00435         deskey(key, 0, ek);
00436         deskey(key, 1, dk);
00437 }
00438 
00439 
00440 void des_block_encrypt(const u8 *plain, const u32 *ek, u8 *crypt)
00441 {
00442         u32 work[2];
00443         work[0] = WPA_GET_BE32(plain);
00444         work[1] = WPA_GET_BE32(plain + 4);
00445         desfunc(work, ek);
00446         WPA_PUT_BE32(crypt, work[0]);
00447         WPA_PUT_BE32(crypt + 4, work[1]);
00448 }
00449 
00450 
00451 void des_block_decrypt(const u8 *crypt, const u32 *dk, u8 *plain)
00452 {
00453         u32 work[2];
00454         work[0] = WPA_GET_BE32(crypt);
00455         work[1] = WPA_GET_BE32(crypt + 4);
00456         desfunc(work, dk);
00457         WPA_PUT_BE32(plain, work[0]);
00458         WPA_PUT_BE32(plain + 4, work[1]);
00459 }
00460 
00461 
00462 void des3_key_setup(const u8 *key, struct des3_key_s *dkey)
00463 {
00464         deskey(key, 0, dkey->ek[0]);
00465         deskey(key + 8, 1, dkey->ek[1]);
00466         deskey(key + 16, 0, dkey->ek[2]);
00467 
00468         deskey(key, 1, dkey->dk[2]);
00469         deskey(key + 8, 0, dkey->dk[1]);
00470         deskey(key + 16, 1, dkey->dk[0]);
00471 }
00472 
00473 
00474 void des3_encrypt(const u8 *plain, const struct des3_key_s *key, u8 *crypt)
00475 {
00476         u32 work[2];
00477 
00478         work[0] = WPA_GET_BE32(plain);
00479         work[1] = WPA_GET_BE32(plain + 4);
00480         desfunc(work, key->ek[0]);
00481         desfunc(work, key->ek[1]);
00482         desfunc(work, key->ek[2]);
00483         WPA_PUT_BE32(crypt, work[0]);
00484         WPA_PUT_BE32(crypt + 4, work[1]);
00485 }
00486 
00487 
00488 void des3_decrypt(const u8 *crypt, const struct des3_key_s *key, u8 *plain)
00489 {
00490         u32 work[2];
00491 
00492         work[0] = WPA_GET_BE32(crypt);
00493         work[1] = WPA_GET_BE32(crypt + 4);
00494         desfunc(work, key->dk[0]);
00495         desfunc(work, key->dk[1]);
00496         desfunc(work, key->dk[2]);
00497         WPA_PUT_BE32(plain, work[0]);
00498         WPA_PUT_BE32(plain + 4, work[1]);
00499 }

wpa_supplicant_node
Author(s): Package maintained by Blaise Gassend
autogenerated on Thu Jan 2 2014 11:25:12