/* * UFC-crypt: ultra fast crypt(3) implementation * * Copyright (C) 1991, 1992, Free Software Foundation, Inc. * * This library 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. * * This library 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. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the Free * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * @(#)crypt_util.c 2.31 02/08/92 * * Support routines * */ #ifdef DEBUG #include #endif #ifndef STATIC #define STATIC static #endif #include "patchlevel.h" #include "ufc-crypt.h" static char patchlevel_str[] = PATCHLEVEL; /* * Permutation done once on the 56 bit * key derived from the original 8 byte ASCII key. */ static int pc1[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 }; /* * How much to rotate each 28 bit half of the pc1 permutated * 56 bit key before using pc2 to give the i' key */ static int rots[16] = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 }; /* * Permutation giving the key * of the i' DES round */ static int pc2[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 }; /* * The E expansion table which selects * bits from the 32 bit intermediate result. */ static int esel[48] = { 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 int e_inverse[64]; /* * Permutation done on the * result of sbox lookups */ static int perm32[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 }; /* * The sboxes */ static int sbox[8][4][16]= { { { 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 } } }; /* * This is the initial * permutation matrix */ static int initial_perm[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 }; /* * This is the final * permutation matrix */ static int final_perm[64] = { 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 }; /* * The 16 DES keys in BITMASK format */ #ifdef _UFC_32_ long32 _ufc_keytab[16][2]; #endif #ifdef _UFC_64_ long64 _ufc_keytab[16]; #endif #define ascii_to_bin(c) ((c)>='a'?(c-59):(c)>='A'?((c)-53):(c)-'.') #define bin_to_ascii(c) ((c)>=38?((c)-38+'a'):(c)>=12?((c)-12+'A'):(c)+'.') /* Macro to set a bit (0..23) */ #define BITMASK(i) ( (1<<(11-(i)%12+3)) << ((i)<12?16:0) ) /* * sb arrays: * * Workhorses of the inner loop of the DES implementation. * They do sbox lookup, shifting of this value, 32 bit * permutation and E permutation for the next round. * * Kept in 'BITMASK' format. */ #ifdef _UFC_32_ long32 _ufc_sb0[8192], _ufc_sb1[8192], _ufc_sb2[8192], _ufc_sb3[8192]; static long32 *sb[4] = {_ufc_sb0, _ufc_sb1, _ufc_sb2, _ufc_sb3}; #endif #ifdef _UFC_64_ long64 _ufc_sb0[4096], _ufc_sb1[4096], _ufc_sb2[4096], _ufc_sb3[4096]; static long64 *sb[4] = {_ufc_sb0, _ufc_sb1, _ufc_sb2, _ufc_sb3}; #endif /* * eperm32tab: do 32 bit permutation and E selection * * The first index is the byte number in the 32 bit value to be permuted * - second - is the value of this byte * - third - selects the two 32 bit values * * The table is used and generated internally in init_des to speed it up */ static ufc_long eperm32tab[4][256][2]; /* * do_pc1: permform pc1 permutation in the key schedule generation. * * The first index is the byte number in the 8 byte ASCII key * - second - - the two 28 bits halfs of the result * - third - selects the 7 bits actually used of each byte * * The result is kept with 28 bit per 32 bit with the 4 most significant * bits zero. */ static ufc_long do_pc1[8][2][128]; /* * do_pc2: permform pc2 permutation in the key schedule generation. * * The first index is the septet number in the two 28 bit intermediate values * - second - - - septet values * * Knowledge of the structure of the pc2 permutation is used. * * The result is kept with 28 bit per 32 bit with the 4 most significant * bits zero. */ static ufc_long do_pc2[8][128]; /* * efp: undo an extra e selection and do final * permutation giving the DES result. * * Invoked 6 bit a time on two 48 bit values * giving two 32 bit longs. */ static ufc_long efp[16][64][2]; static unsigned char bytemask[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 }; static ufc_long longmask[32] = { 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 }; #ifdef DEBUG pr_bits(a, n) ufc_long *a; int n; { ufc_long i, j, t, tmp; n /= 8; for(i = 0; i < n; i++) { tmp=0; for(j = 0; j < 8; j++) { t=8*i+j; tmp|=(a[t/24] & BITMASK(t % 24))?bytemask[j]:0; } (void)printf("%02x ",tmp); } printf(" "); } static set_bits(v, b) ufc_long v; ufc_long *b; { ufc_long i; *b = 0; for(i = 0; i < 24; i++) { if(v & longmask[8 + i]) *b |= BITMASK(i); } } #endif /* * Silly rewrite of 'bzero'. I do so * because some machines don't have * bzero and some don't have memset. */ STATIC void clearmem(start, cnt) char *start; int cnt; { while(cnt--) *start++ = '\0'; } static int initialized = 0; /* lookup a 6 bit value in sbox */ #define s_lookup(i,s) sbox[(i)][(((s)>>4) & 0x2)|((s) & 0x1)][((s)>>1) & 0xf]; /* * Initialize unit - may be invoked directly * by fcrypt users. */ void init_des() { int comes_from_bit; int bit, sg; ufc_long j; ufc_long mask1, mask2; /* * Create the do_pc1 table used * to affect pc1 permutation * when generating keys */ for(bit = 0; bit < 56; bit++) { comes_from_bit = pc1[bit] - 1; mask1 = bytemask[comes_from_bit % 8 + 1]; mask2 = longmask[bit % 28 + 4]; for(j = 0; j < 128; j++) { if(j & mask1) do_pc1[comes_from_bit / 8][bit / 28][j] |= mask2; } } /* * Create the do_pc2 table used * to affect pc2 permutation when * generating keys */ for(bit = 0; bit < 48; bit++) { comes_from_bit = pc2[bit] - 1; mask1 = bytemask[comes_from_bit % 7 + 1]; mask2 = BITMASK(bit % 24); for(j = 0; j < 128; j++) { if(j & mask1) do_pc2[comes_from_bit / 7][j] |= mask2; } } /* * Now generate the table used to do combined * 32 bit permutation and e expansion * * We use it because we have to permute 16384 32 bit * longs into 48 bit in order to initialize sb. * * Looping 48 rounds per permutation becomes * just too slow... * */ clearmem((char*)eperm32tab, sizeof(eperm32tab)); for(bit = 0; bit < 48; bit++) { ufc_long mask1,comes_from; comes_from = perm32[esel[bit]-1]-1; mask1 = bytemask[comes_from % 8]; for(j = 256; j--;) { if(j & mask1) eperm32tab[comes_from / 8][j][bit / 24] |= BITMASK(bit % 24); } } /* * Create the sb tables: * * For each 12 bit segment of an 48 bit intermediate * result, the sb table precomputes the two 4 bit * values of the sbox lookups done with the two 6 * bit halves, shifts them to their proper place, * sends them through perm32 and finally E expands * them so that they are ready for the next * DES round. * */ for(sg = 0; sg < 4; sg++) { int j1, j2; int s1, s2; for(j1 = 0; j1 < 64; j1++) { s1 = s_lookup(2 * sg, j1); for(j2 = 0; j2 < 64; j2++) { ufc_long to_permute, inx; s2 = s_lookup(2 * sg + 1, j2); to_permute = ((s1 << 4) | s2) << (24 - 8 * sg); #ifdef _UFC_32_ inx = ((j1 << 6) | j2) << 1; sb[sg][inx ] = eperm32tab[0][(to_permute >> 24) & 0xff][0]; sb[sg][inx+1] = eperm32tab[0][(to_permute >> 24) & 0xff][1]; sb[sg][inx ] |= eperm32tab[1][(to_permute >> 16) & 0xff][0]; sb[sg][inx+1] |= eperm32tab[1][(to_permute >> 16) & 0xff][1]; sb[sg][inx ] |= eperm32tab[2][(to_permute >> 8) & 0xff][0]; sb[sg][inx+1] |= eperm32tab[2][(to_permute >> 8) & 0xff][1]; sb[sg][inx ] |= eperm32tab[3][(to_permute) & 0xff][0]; sb[sg][inx+1] |= eperm32tab[3][(to_permute) & 0xff][1]; #endif #ifdef _UFC_64_ inx = ((j1 << 6) | j2); sb[sg][inx] = ((long64)eperm32tab[0][(to_permute >> 24) & 0xff][0] << 32) | (long64)eperm32tab[0][(to_permute >> 24) & 0xff][1]; sb[sg][inx] |= ((long64)eperm32tab[1][(to_permute >> 16) & 0xff][0] << 32) | (long64)eperm32tab[1][(to_permute >> 16) & 0xff][1]; sb[sg][inx] |= ((long64)eperm32tab[2][(to_permute >> 8) & 0xff][0] << 32) | (long64)eperm32tab[2][(to_permute >> 8) & 0xff][1]; sb[sg][inx] |= ((long64)eperm32tab[3][(to_permute) & 0xff][0] << 32) | (long64)eperm32tab[3][(to_permute) & 0xff][1]; #endif } } } /* * Create an inverse matrix for esel telling * where to plug out bits if undoing it */ for(bit=48; bit--;) { e_inverse[esel[bit] - 1 ] = bit; e_inverse[esel[bit] - 1 + 32] = bit + 48; } /* * create efp: the matrix used to * undo the E expansion and effect final permutation */ clearmem((char*)efp, sizeof efp); for(bit = 0; bit < 64; bit++) { int o_bit, o_long; ufc_long word_value, mask1, mask2; int comes_from_f_bit, comes_from_e_bit; int comes_from_word, bit_within_word; /* See where bit i belongs in the two 32 bit long's */ o_long = bit / 32; /* 0..1 */ o_bit = bit % 32; /* 0..31 */ /* * And find a bit in the e permutated value setting this bit. * * Note: the e selection may have selected the same bit several * times. By the initialization of e_inverse, we only look * for one specific instance. */ comes_from_f_bit = final_perm[bit] - 1; /* 0..63 */ comes_from_e_bit = e_inverse[comes_from_f_bit]; /* 0..95 */ comes_from_word = comes_from_e_bit / 6; /* 0..15 */ bit_within_word = comes_from_e_bit % 6; /* 0..5 */ mask1 = longmask[bit_within_word + 26]; mask2 = longmask[o_bit]; for(word_value = 64; word_value--;) { if(word_value & mask1) efp[comes_from_word][word_value][o_long] |= mask2; } } initialized++; } /* * Process the elements of the sb table permuting the * bits swapped in the expansion by the current salt. */ #ifdef _UFC_32_ STATIC void shuffle_sb(k, saltbits) long32 *k; ufc_long saltbits; { ufc_long j; long32 x; for(j=4096; j--;) { x = (k[0] ^ k[1]) & (long32)saltbits; *k++ ^= x; *k++ ^= x; } } #endif #ifdef _UFC_64_ STATIC void shuffle_sb(k, saltbits) long64 *k; ufc_long saltbits; { ufc_long j; long64 x; for(j=4096; j--;) { x = ((*k >> 32) ^ *k) & (long64)saltbits; *k++ ^= (x << 32) | x; } } #endif /* * Setup the unit for a new salt * Hopefully we'll not see a new salt in each crypt call. */ static unsigned char current_salt[3] = "&&"; /* invalid value */ static ufc_long current_saltbits = 0; static int direction = 0; STATIC void setup_salt(s) char *s; { ufc_long i, j, saltbits; if(!initialized) init_des(); if(s[0] == current_salt[0] && s[1] == current_salt[1]) return; current_salt[0] = s[0]; current_salt[1] = s[1]; /* * This is the only crypt change to DES: * entries are swapped in the expansion table * according to the bits set in the salt. */ saltbits = 0; for(i = 0; i < 2; i++) { long c=ascii_to_bin(s[i]); if(c < 0 || c > 63) c = 0; for(j = 0; j < 6; j++) { if((c >> j) & 0x1) saltbits |= BITMASK(6 * i + j); } } /* * Permute the sb table values * to reflect the changed e * selection table */ shuffle_sb(_ufc_sb0, current_saltbits ^ saltbits); shuffle_sb(_ufc_sb1, current_saltbits ^ saltbits); shuffle_sb(_ufc_sb2, current_saltbits ^ saltbits); shuffle_sb(_ufc_sb3, current_saltbits ^ saltbits); current_saltbits = saltbits; } STATIC void ufc_mk_keytab(key) char *key; { ufc_long v1, v2, *k1; int i; #ifdef _UFC_32_ long32 v, *k2 = &_ufc_keytab[0][0]; #endif #ifdef _UFC_64_ long64 v, *k2 = &_ufc_keytab[0]; #endif v1 = v2 = 0; k1 = &do_pc1[0][0][0]; for(i = 8; i--;) { v1 |= k1[*key & 0x7f]; k1 += 128; v2 |= k1[*key++ & 0x7f]; k1 += 128; } for(i = 0; i < 16; i++) { k1 = &do_pc2[0][0]; v1 = (v1 << rots[i]) | (v1 >> (28 - rots[i])); v = k1[(v1 >> 21) & 0x7f]; k1 += 128; v |= k1[(v1 >> 14) & 0x7f]; k1 += 128; v |= k1[(v1 >> 7) & 0x7f]; k1 += 128; v |= k1[(v1 ) & 0x7f]; k1 += 128; #ifdef _UFC_32_ *k2++ = v; v = 0; #endif #ifdef _UFC_64_ v <<= 32; #endif v2 = (v2 << rots[i]) | (v2 >> (28 - rots[i])); v |= k1[(v2 >> 21) & 0x7f]; k1 += 128; v |= k1[(v2 >> 14) & 0x7f]; k1 += 128; v |= k1[(v2 >> 7) & 0x7f]; k1 += 128; v |= k1[(v2 ) & 0x7f]; *k2++ = v; } direction = 0; } /* * Undo an extra E selection and do final permutations */ ufc_long *_ufc_dofinalperm(l1, l2, r1, r2) ufc_long l1,l2,r1,r2; { ufc_long v1, v2, x; static ufc_long ary[2]; x = (l1 ^ l2) & current_saltbits; l1 ^= x; l2 ^= x; x = (r1 ^ r2) & current_saltbits; r1 ^= x; r2 ^= x; v1=v2=0; l1 >>= 3; l2 >>= 3; r1 >>= 3; r2 >>= 3; v1 |= efp[15][ r2 & 0x3f][0]; v2 |= efp[15][ r2 & 0x3f][1]; v1 |= efp[14][(r2 >>= 6) & 0x3f][0]; v2 |= efp[14][ r2 & 0x3f][1]; v1 |= efp[13][(r2 >>= 10) & 0x3f][0]; v2 |= efp[13][ r2 & 0x3f][1]; v1 |= efp[12][(r2 >>= 6) & 0x3f][0]; v2 |= efp[12][ r2 & 0x3f][1]; v1 |= efp[11][ r1 & 0x3f][0]; v2 |= efp[11][ r1 & 0x3f][1]; v1 |= efp[10][(r1 >>= 6) & 0x3f][0]; v2 |= efp[10][ r1 & 0x3f][1]; v1 |= efp[ 9][(r1 >>= 10) & 0x3f][0]; v2 |= efp[ 9][ r1 & 0x3f][1]; v1 |= efp[ 8][(r1 >>= 6) & 0x3f][0]; v2 |= efp[ 8][ r1 & 0x3f][1]; v1 |= efp[ 7][ l2 & 0x3f][0]; v2 |= efp[ 7][ l2 & 0x3f][1]; v1 |= efp[ 6][(l2 >>= 6) & 0x3f][0]; v2 |= efp[ 6][ l2 & 0x3f][1]; v1 |= efp[ 5][(l2 >>= 10) & 0x3f][0]; v2 |= efp[ 5][ l2 & 0x3f][1]; v1 |= efp[ 4][(l2 >>= 6) & 0x3f][0]; v2 |= efp[ 4][ l2 & 0x3f][1]; v1 |= efp[ 3][ l1 & 0x3f][0]; v2 |= efp[ 3][ l1 & 0x3f][1]; v1 |= efp[ 2][(l1 >>= 6) & 0x3f][0]; v2 |= efp[ 2][ l1 & 0x3f][1]; v1 |= efp[ 1][(l1 >>= 10) & 0x3f][0]; v2 |= efp[ 1][ l1 & 0x3f][1]; v1 |= efp[ 0][(l1 >>= 6) & 0x3f][0]; v2 |= efp[ 0][ l1 & 0x3f][1]; ary[0] = v1; ary[1] = v2; return ary; } /* * crypt only: convert from 64 bit to 11 bit ASCII * prefixing with the salt */ STATIC char *output_conversion(v1, v2, salt) ufc_long v1, v2; char *salt; { static char outbuf[14]; int i, s; outbuf[0] = salt[0]; outbuf[1] = salt[1] ? salt[1] : salt[0]; for(i = 0; i < 5; i++) outbuf[i + 2] = bin_to_ascii((v1 >> (26 - 6 * i)) & 0x3f); s = (v2 & 0xf) << 2; v2 = (v2 >> 2) | ((v1 & 0x3) << 30); for(i = 5; i < 10; i++) outbuf[i + 2] = bin_to_ascii((v2 >> (56 - 6 * i)) & 0x3f); outbuf[12] = bin_to_ascii(s); outbuf[13] = 0; return outbuf; } ufc_long *_ufc_doit(); /* * UNIX crypt function */ char *crypt(key, salt) char *key, *salt; { ufc_long *s; char ktab[9]; /* * Hack DES tables according to salt */ setup_salt(salt); /* * Setup key schedule */ clearmem(ktab, sizeof ktab); (void)strncpy(ktab, key, 8); ufc_mk_keytab(ktab); /* * Go for the 25 DES encryptions */ s = _ufc_doit((ufc_long)0, (ufc_long)0, (ufc_long)0, (ufc_long)0, (ufc_long)25); /* * And convert back to 6 bit ASCII */ return output_conversion(s[0], s[1], salt); } /* * To make fcrypt users happy. * They don't need to call init_des. */ char *fcrypt(key, salt) char *key; char *salt; { return crypt(key, salt); } /* * UNIX encrypt function. Takes a bitvector * represented by one byte per bit and * encrypt/decrypt according to edflag */ void encrypt(block, edflag) char *block; int edflag; { ufc_long l1, l2, r1, r2, *s; int i; /* * Undo any salt changes to E expansion */ setup_salt(".."); /* * Reverse key table if * changing operation (encrypt/decrypt) */ if((edflag == 0) != (direction == 0)) { for(i = 0; i < 8; i++) { #ifdef _UFC_32_ long32 x; x = _ufc_keytab[15-i][0]; _ufc_keytab[15-i][0] = _ufc_keytab[i][0]; _ufc_keytab[i][0] = x; x = _ufc_keytab[15-i][1]; _ufc_keytab[15-i][1] = _ufc_keytab[i][1]; _ufc_keytab[i][1] = x; #endif #ifdef _UFC_64_ long64 x; x = _ufc_keytab[15-i]; _ufc_keytab[15-i] = _ufc_keytab[i]; _ufc_keytab[i] = x; #endif } direction = edflag; } /* * Do initial permutation + E expansion */ i = 0; for(l1 = 0; i < 24; i++) { if(block[initial_perm[esel[i]-1]-1]) l1 |= BITMASK(i); } for(l2 = 0; i < 48; i++) { if(block[initial_perm[esel[i]-1]-1]) l2 |= BITMASK(i-24); } i = 0; for(r1 = 0; i < 24; i++) { if(block[initial_perm[esel[i]-1+32]-1]) r1 |= BITMASK(i); } for(r2 = 0; i < 48; i++) { if(block[initial_perm[esel[i]-1+32]-1]) r2 |= BITMASK(i-24); } /* * Do DES inner loops + final conversion */ s = _ufc_doit(l1, l2, r1, r2, (ufc_long)1); /* * And convert to bit array */ l1 = s[0]; r1 = s[1]; for(i = 0; i < 32; i++) { *block++ = (l1 & longmask[i]) != 0; } for(i = 0; i < 32; i++) { *block++ = (r1 & longmask[i]) != 0; } } /* * UNIX setkey function. Take a 64 bit DES * key and setup the machinery. */ void setkey(key) char *key; { int i,j; unsigned char c; unsigned char ktab[8]; setup_salt(".."); /* be sure we're initialized */ for(i = 0; i < 8; i++) { for(j = 0, c = 0; j < 8; j++) c = c << 1 | *key++; ktab[i] = c >> 1; } ufc_mk_keytab(ktab); }