bc31b52003-11-10Henrik Grubbström (Grubba) /* || This file is part of Pike. For copyright information see COPYRIGHT. || Pike is distributed under GPL, LGPL and MPL. See the file COPYING || for more information.
74b3d32003-12-07Marcus Comstedt || $Id: crypt.c,v 1.9 2003/12/07 19:42:03 marcus Exp $
bc31b52003-11-10Henrik Grubbström (Grubba) */ /* * From Andy Tanenbaum's book "Computer Networks", * rewritten in C */ struct block { unsigned char b_data[64]; }; struct ordering { unsigned char o_data[64]; }; static struct block key; static struct ordering 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 struct ordering 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 struct ordering 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 struct ordering 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 struct ordering 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 struct ordering 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 struct ordering 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 unsigned char 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 int rots[] = { 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1, }; static void transpose(struct block *data, struct ordering *t, int n) { struct block x; x = *data; while (n-- > 0) { data->b_data[n] = x.b_data[t->o_data[n] - 1]; } } static void rotate(struct block *key) { register unsigned char *p = key->b_data; register unsigned char *ep = &(key->b_data[55]); int data0 = key->b_data[0], data28 = key->b_data[28]; while (p++ < ep) *(p-1) = *p; key->b_data[27] = (char) data0; key->b_data[55] = (char) data28; } static struct ordering *EP = &etr; static void f(int i, struct block *key, struct block *a, struct block *x) { struct block e, ikey, y; int k; register unsigned char *p, *q, *r; e = *a; transpose(&e, EP, 48); for (k = rots[i]; k; k--) rotate(key); ikey = *key; transpose(&ikey, &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; } q = x->b_data; for (k = 0; k < 8; k++) { register int xb, r; r = *p++ << 5; r += *p++ << 3; r += *p++ << 2; r += *p++ << 1; r += *p++; r += *p++ << 4; xb = s_boxes[k][r]; *q++ = (char) (xb >> 3) & 1; *q++ = (char) (xb>>2) & 1; *q++ = (char) (xb>>1) & 1; *q++ = (char) (xb & 1); } transpose(x, &ptr, 32); }
d356c72003-11-11Henrik Grubbström (Grubba) static void definekey(char *k)
bc31b52003-11-10Henrik Grubbström (Grubba) { key = *((struct block *) k); transpose(&key, &KeyTr1, 56); }
343f3d2003-11-10Martin Nilsson static void encrypt(char *blck, int edflag)
bc31b52003-11-10Henrik Grubbström (Grubba) { register struct block *p = (struct block *) blck; register int i; transpose(p, &InitialTr, 64); for (i = 15; i>= 0; i--) { int j = edflag ? i : 15 - i; register int k; struct block b, x; b = *p; for (k = 31; k >= 0; k--) { p->b_data[k] = b.b_data[k + 32]; } f(j, &key, p, &x); for (k = 31; k >= 0; k--) { p->b_data[k+32] = b.b_data[k] ^ x.b_data[k]; } } transpose(p, &swap, 64); transpose(p, &FinalTr, 64); }
74b3d32003-12-07Marcus Comstedt char *crypt(const char *pw, const char *salt)
bc31b52003-11-10Henrik Grubbström (Grubba) { char pwb[66]; static char result[16];
74b3d32003-12-07Marcus Comstedt  register char *p = pwb, *p2;
bc31b52003-11-10Henrik Grubbström (Grubba)  struct ordering new_etr; register int i; while (*pw && p < &pwb[64]) { register int j = 7; while (j--) { *p++ = (*pw >> j) & 01; } pw++; *p++ = 0; } while (p < &pwb[64]) *p++ = 0; definekey(p = pwb); while (p < &pwb[66]) *p++ = 0; new_etr = etr; EP = &new_etr; for (i = 0; i < 2; i++) { register char c = *salt++; register 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] = (char) temp; } } } if (result[1] == 0) result[1] = result[0]; for (i = 0; i < 25; i++) encrypt(pwb,0); EP = &etr; p = pwb;
74b3d32003-12-07Marcus Comstedt  p2 = result+2;
bc31b52003-11-10Henrik Grubbström (Grubba)  while (p < &pwb[66]) { register int c = 0; register int j = 6; 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 */
74b3d32003-12-07Marcus Comstedt  *p2++ = (char) c;
bc31b52003-11-10Henrik Grubbström (Grubba)  }
74b3d32003-12-07Marcus Comstedt  *p2 = 0;
bc31b52003-11-10Henrik Grubbström (Grubba)  return result; }