sys/netproto/ncp/ncp_crypt.c

   1 /*
   2  * $FreeBSD: src/sys/netncp/ncp_crypt.c,v 1.3.2.1 2001/02/22 08:57:58 bp Exp $
   3  * $DragonFly: src/sys/netproto/ncp/ncp_crypt.c,v 1.4 2006/01/14 13:36:40 swildner Exp $
   4  */
   5 #include <sys/param.h>
   6 #include <sys/systm.h>
   7 #include "ncp.h"
   8 #include "ncp_subr.h"
   9
  10 /*
  11  *  Routines in this file based on work of Volker Lendecke
  12  */
  13 /*$*********************************************************
  14    $*
  15    $* This code has been taken from DDJ 11/93, from an
  16    $* article by Pawel Szczerbina.
  17    $*
  18    $* Password encryption routines follow.
  19    $* Converted to C from Barry Nance's Pascal
  20    $* prog published in the March -93 issue of Byte.
  21    $*
  22    $* Adapted to be useable for ncpfs by
  23    $* Volker Lendecke <lendecke@namu01.gwdg.de> in
  24    $* October 1995.
  25    $*
  26    $********************************************************* */
  27
  28
  29
  30 typedef unsigned char buf32[32];
  31
  32 static unsigned char encrypttable[256] = {
  33 0x7, 0x8, 0x0, 0x8, 0x6, 0x4, 0xE, 0x4, 0x5, 0xC, 0x1, 0x7, 0xB, 0xF, 0xA, 0x8,
  34 0xF, 0x8, 0xC, 0xC, 0x9, 0x4, 0x1, 0xE, 0x4, 0x6, 0x2, 0x4, 0x0, 0xA, 0xB, 0x9,
  35 0x2, 0xF, 0xB, 0x1, 0xD, 0x2, 0x1, 0x9, 0x5, 0xE, 0x7, 0x0, 0x0, 0x2, 0x6, 0x6,
  36 0x0, 0x7, 0x3, 0x8, 0x2, 0x9, 0x3, 0xF, 0x7, 0xF, 0xC, 0xF, 0x6, 0x4, 0xA, 0x0,
  37 0x2, 0x3, 0xA, 0xB, 0xD, 0x8, 0x3, 0xA, 0x1, 0x7, 0xC, 0xF, 0x1, 0x8, 0x9, 0xD,
  38 0x9, 0x1, 0x9, 0x4, 0xE, 0x4, 0xC, 0x5, 0x5, 0xC, 0x8, 0xB, 0x2, 0x3, 0x9, 0xE,
  39 0x7, 0x7, 0x6, 0x9, 0xE, 0xF, 0xC, 0x8, 0xD, 0x1, 0xA, 0x6, 0xE, 0xD, 0x0, 0x7,
  40 0x7, 0xA, 0x0, 0x1, 0xF, 0x5, 0x4, 0xB, 0x7, 0xB, 0xE, 0xC, 0x9, 0x5, 0xD, 0x1,
  41 0xB, 0xD, 0x1, 0x3, 0x5, 0xD, 0xE, 0x6, 0x3, 0x0, 0xB, 0xB, 0xF, 0x3, 0x6, 0x4,
  42 0x9, 0xD, 0xA, 0x3, 0x1, 0x4, 0x9, 0x4, 0x8, 0x3, 0xB, 0xE, 0x5, 0x0, 0x5, 0x2,
  43 0xC, 0xB, 0xD, 0x5, 0xD, 0x5, 0xD, 0x2, 0xD, 0x9, 0xA, 0xC, 0xA, 0x0, 0xB, 0x3,
  44 0x5, 0x3, 0x6, 0x9, 0x5, 0x1, 0xE, 0xE, 0x0, 0xE, 0x8, 0x2, 0xD, 0x2, 0x2, 0x0,
  45 0x4, 0xF, 0x8, 0x5, 0x9, 0x6, 0x8, 0x6, 0xB, 0xA, 0xB, 0xF, 0x0, 0x7, 0x2, 0x8,
  46 0xC, 0x7, 0x3, 0xA, 0x1, 0x4, 0x2, 0x5, 0xF, 0x7, 0xA, 0xC, 0xE, 0x5, 0x9, 0x3,
  47 0xE, 0x7, 0x1, 0x2, 0xE, 0x1, 0xF, 0x4, 0xA, 0x6, 0xC, 0x6, 0xF, 0x4, 0x3, 0x0,
  48 0xC, 0x0, 0x3, 0x6, 0xF, 0x8, 0x7, 0xB, 0x2, 0xD, 0xC, 0x6, 0xA, 0xA, 0x8, 0xD
  49 };
  50
  51 static buf32 encryptkeys = {
  52     0x48, 0x93, 0x46, 0x67, 0x98, 0x3D, 0xE6, 0x8D,
  53     0xB7, 0x10, 0x7A, 0x26, 0x5A, 0xB9, 0xB1, 0x35,
  54     0x6B, 0x0F, 0xD5, 0x70, 0xAE, 0xFB, 0xAD, 0x11,
  55     0xF4, 0x47, 0xDC, 0xA7, 0xEC, 0xCF, 0x50, 0xC0
  56 };
  57
  58 /*
  59  * Create table-based 16-bytes hash from a 32-bytes array
  60  */
  61 static void
  62 nw_hash(buf32 temp, unsigned char *target) {
  63         short sum;
  64         unsigned char b3;
  65         int s, b2, i;
  66
  67         sum = 0;
  68
  69         for (b2 = 0; b2 <= 1; ++b2) {
  70                 for (s = 0; s <= 31; ++s) {
  71                         b3 = (temp[s] + sum) ^ (temp[(s + sum) & 31] - encryptkeys[s]);
  72                         sum += b3;
  73                         temp[s] = b3;
  74                 }
  75         }
  76
  77         for (i = 0; i <= 15; ++i) {
  78                 target[i] = encrypttable[temp[2 * i]]
  79                     | (encrypttable[temp[2 * i + 1]] << 4);
  80         }
  81 }
  82
  83
  84 /*
  85  * Create a 16-bytes pattern from given buffer based on a four bytes key
  86  */
  87 void
  88 nw_keyhash(const u_char *key, const u_char *buf, int buflen, u_char *target) {
  89         int b2, d, s;
  90         buf32 temp;
  91
  92         while (buflen > 0 && buf[buflen - 1] == 0)
  93                 buflen--;
  94
  95         bzero(temp, sizeof(temp));
  96
  97         d = 0;
  98         while (buflen >= 32) {
  99                 for (s = 0; s <= 31; ++s)
 100                         temp[s] ^= buf[d++];
 101                 buflen -= 32;
 102         }
 103         b2 = d;
 104         if (buflen > 0) {
 105                 for (s = 0; s <= 31; ++s) {
 106                         if (d + buflen == b2) {
 107                                 temp[s] ^= encryptkeys[s];
 108                                 b2 = d;
 109                         } else
 110                                 temp[s] ^= buf[b2++];
 111                 }
 112         }
 113         for (s = 0; s <= 31; ++s)
 114                 temp[s] ^= key[s & 3];
 115
 116         nw_hash(temp, target);
 117 }
 118
 119 /*
 120  * Create an 8-bytes pattern from an 8-bytes key and 16-bytes of data
 121  */
 122 void
 123 nw_encrypt(const u_char *fra, const u_char *buf, u_char *target) {
 124         buf32 k;
 125         int s;
 126
 127         nw_keyhash(fra, buf, 16, k);
 128         nw_keyhash(fra + 4, buf, 16, k + 16);
 129
 130         for (s = 0; s < 16; s++)
 131                 k[s] ^= k[31 - s];
 132
 133         for (s = 0; s < 8; s++)
 134                 *target++ = k[s] ^ k[15 - s];
 135 }
 136
 137 #ifdef _KERNEL
 138 /*
 139  * MD4 routine taken from libmd sources
 140  */
 141 typedef u_int32_t       UINT4;
 142 typedef unsigned char *POINTER;
 143
 144 static void Decode(UINT4 *, const unsigned char *, unsigned int);
 145
 146 /* Constants for MD4Transform routine.
 147  */
 148 #define S11 3
 149 #define S12 7
 150 #define S13 11
 151 #define S14 19
 152 #define S21 3
 153 #define S22 5
 154 #define S23 9
 155 #define S24 13
 156 #define S31 3
 157 #define S32 9
 158 #define S33 11
 159 #define S34 15
 160
 161 /* F, G and H are basic MD4 functions.
 162  */
 163 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
 164 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
 165 #define H(x, y, z) ((x) ^ (y) ^ (z))
 166
 167 /* ROTATE_LEFT rotates x left n bits.
 168  */
 169 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
 170
 171 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
 172 /* Rotation is separate from addition to prevent recomputation */
 173 #define FF(a, b, c, d, x, s) { \
 174     (a) += F ((b), (c), (d)) + (x); \
 175     (a) = ROTATE_LEFT ((a), (s)); \
 176   }
 177 #define GG(a, b, c, d, x, s) { \
 178     (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
 179     (a) = ROTATE_LEFT ((a), (s)); \
 180   }
 181 #define HH(a, b, c, d, x, s) { \
 182     (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
 183     (a) = ROTATE_LEFT ((a), (s)); \
 184   }
 185
 186 void
 187 ncp_sign(const u_int32_t *state, const char *block, u_int32_t *ostate) {
 188         UINT4 a, b, c, d, x[16];
 189
 190         Decode (x, block, 64);
 191         a = state[0];
 192         b = state[1];
 193         c = state[2];
 194         d = state[3];
 195         /* Round 1 */
 196         FF (a, b, c, d, x[ 0], S11); /* 1 */
 197         FF (d, a, b, c, x[ 1], S12); /* 2 */
 198         FF (c, d, a, b, x[ 2], S13); /* 3 */
 199         FF (b, c, d, a, x[ 3], S14); /* 4 */
 200         FF (a, b, c, d, x[ 4], S11); /* 5 */
 201         FF (d, a, b, c, x[ 5], S12); /* 6 */
 202         FF (c, d, a, b, x[ 6], S13); /* 7 */
 203         FF (b, c, d, a, x[ 7], S14); /* 8 */
 204         FF (a, b, c, d, x[ 8], S11); /* 9 */
 205         FF (d, a, b, c, x[ 9], S12); /* 10 */
 206         FF (c, d, a, b, x[10], S13); /* 11 */
 207         FF (b, c, d, a, x[11], S14); /* 12 */
 208         FF (a, b, c, d, x[12], S11); /* 13 */
 209         FF (d, a, b, c, x[13], S12); /* 14 */
 210         FF (c, d, a, b, x[14], S13); /* 15 */
 211         FF (b, c, d, a, x[15], S14); /* 16 */
 212
 213         /* Round 2 */
 214         GG (a, b, c, d, x[ 0], S21); /* 17 */
 215         GG (d, a, b, c, x[ 4], S22); /* 18 */
 216         GG (c, d, a, b, x[ 8], S23); /* 19 */
 217         GG (b, c, d, a, x[12], S24); /* 20 */
 218         GG (a, b, c, d, x[ 1], S21); /* 21 */
 219         GG (d, a, b, c, x[ 5], S22); /* 22 */
 220         GG (c, d, a, b, x[ 9], S23); /* 23 */
 221         GG (b, c, d, a, x[13], S24); /* 24 */
 222         GG (a, b, c, d, x[ 2], S21); /* 25 */
 223         GG (d, a, b, c, x[ 6], S22); /* 26 */
 224         GG (c, d, a, b, x[10], S23); /* 27 */
 225         GG (b, c, d, a, x[14], S24); /* 28 */
 226         GG (a, b, c, d, x[ 3], S21); /* 29 */
 227         GG (d, a, b, c, x[ 7], S22); /* 30 */
 228         GG (c, d, a, b, x[11], S23); /* 31 */
 229         GG (b, c, d, a, x[15], S24); /* 32 */
 230
 231         /* Round 3 */
 232         HH (a, b, c, d, x[ 0], S31); /* 33 */
 233         HH (d, a, b, c, x[ 8], S32); /* 34 */
 234         HH (c, d, a, b, x[ 4], S33); /* 35 */
 235         HH (b, c, d, a, x[12], S34); /* 36 */
 236         HH (a, b, c, d, x[ 2], S31); /* 37 */
 237         HH (d, a, b, c, x[10], S32); /* 38 */
 238         HH (c, d, a, b, x[ 6], S33); /* 39 */
 239         HH (b, c, d, a, x[14], S34); /* 40 */
 240         HH (a, b, c, d, x[ 1], S31); /* 41 */
 241         HH (d, a, b, c, x[ 9], S32); /* 42 */
 242         HH (c, d, a, b, x[ 5], S33); /* 43 */
 243         HH (b, c, d, a, x[13], S34); /* 44 */
 244         HH (a, b, c, d, x[ 3], S31); /* 45 */
 245         HH (d, a, b, c, x[11], S32); /* 46 */
 246         HH (c, d, a, b, x[ 7], S33); /* 47 */
 247         HH (b, c, d, a, x[15], S34); /* 48 */
 248
 249         ostate[0] = state[0] + a;
 250         ostate[1] = state[1] + b;
 251         ostate[2] = state[2] + c;
 252         ostate[3] = state[3] + d;
 253 }
 254
 255 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
 256      a multiple of 4.
 257  */
 258 static void
 259 Decode(UINT4 *output, const unsigned char *input, unsigned int len)
 260 {
 261   unsigned int i, j;
 262
 263   for (i = 0, j = 0; j < len; i++, j += 4)
 264     output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
 265       (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
 266 }
 267
 268 #endif /* _KERNEL */