Usenet 1994 January/usenetsourcesnewsgroupsinfomagicjanuary1994.iso/sources/misc/volume28/ufc-crypt/part02

Internet Message Format | 1992-03-19 | 49.8 KB

From: [e-mail] (Michael Glad)
Newsgroups: comp.sources.misc
Subject: v28i116: ufc-crypt - fast crypt/fcrypt routines, Part02/02
Message-ID: <[e-mail]>
Date: 18 Mar 92 14:40:51 GMT
Approved: [e-mail]
X-Md4-Signature: 3dc97c8443c2770033c683d270568e77

Submitted-by: [e-mail] (Michael Glad)
Posting-number: Volume 28, Issue 116
Archive-name: ufc-crypt/part02
Environment: UNIX, 32BIT
Supersedes: ufc-crypt: Volume 23, 97-98

#! /bin/sh
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
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# Contents:  COPYING crypt_util.c
# Wrapped by glad@estella on Fri Mar  6 09:19:49 1992
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'COPYING' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'COPYING'\"
else
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sed "s/^X//" >'COPYING' <<'END_OF_FILE'
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END_OF_FILE
if test 25265 -ne `wc -c <'COPYING'`; then
    echo shar: \"'COPYING'\" unpacked with wrong size!
fi
# end of 'COPYING'
fi
if test -f 'crypt_util.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'crypt_util.c'\"
else
echo shar: Extracting \"'crypt_util.c'\" \(22326 characters\)
sed "s/^X//" >'crypt_util.c' <<'END_OF_FILE'
X/*
X * UFC-crypt: ultra fast crypt(3) implementation
X *
X * Copyright (C) 1991, 1992, Free Software Foundation, Inc.
X *
X * This library is free software; you can redistribute it and/or
X * modify it under the terms of the GNU Library General Public
X * License as published by the Free Software Foundation; either
X * version 2 of the License, or (at your option) any later version.
X *
X * This library is distributed in the hope that it will be useful,
X * but WITHOUT ANY WARRANTY; without even the implied warranty of
X * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
X * Library General Public License for more details.
X *
X * You should have received a copy of the GNU Library General Public
X * License along with this library; if not, write to the Free
X * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
X *
X * @(#)crypt_util.c    2.31 02/08/92
X *
X * Support routines
X *
X */
X
X#ifdef DEBUG
X#include <stdio.h>
X#endif
X
X#ifndef STATIC
X#define STATIC static
X#endif
X
X#include "patchlevel.h"
X#include "ufc-crypt.h"
X
Xstatic char patchlevel_str[] = PATCHLEVEL;
X
X/*
X * Permutation done once on the 56 bit
X *  key derived from the original 8 byte ASCII key.
X */
Xstatic int pc1[56] = {
X  57, 49, 41, 33, 25, 17,  9,  1, 58, 50, 42, 34, 26, 18,
X  10,  2, 59, 51, 43, 35, 27, 19, 11,  3, 60, 52, 44, 36,
X  63, 55, 47, 39, 31, 23, 15,  7, 62, 54, 46, 38, 30, 22,
X  14,  6, 61, 53, 45, 37, 29, 21, 13,  5, 28, 20, 12,  4
X};
X
X/*
X * How much to rotate each 28 bit half of the pc1 permutated
X *  56 bit key before using pc2 to give the i' key
X */
Xstatic int rots[16] = {
X  1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
X};
X
X/*
X * Permutation giving the key
X * of the i' DES round
X */
Xstatic int pc2[48] = {
X  14, 17, 11, 24,  1,  5,  3, 28, 15,  6, 21, 10,
X  23, 19, 12,  4, 26,  8, 16,  7, 27, 20, 13,  2,
X  41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,
X  44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
X};
X
X/*
X * The E expansion table which selects
X * bits from the 32 bit intermediate result.
X */
Xstatic int esel[48] = {
X  32,  1,  2,  3,  4,  5,  4,  5,  6,  7,  8,  9,
X   8,  9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17,
X  16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25,
X  24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32,  1
X};
Xstatic int e_inverse[64];
X
X/*
X * Permutation done on the
X * result of sbox lookups
X */
Xstatic int perm32[32] = {
X  16,  7, 20, 21, 29, 12, 28, 17,  1, 15, 23, 26,  5, 18, 31, 10,
X  2,   8, 24, 14, 32, 27,  3,  9, 19, 13, 30,  6, 22, 11,  4, 25
X};
X
X/*
X * The sboxes
X */
Xstatic int sbox[8][4][16]= {
X        { { 14,  4, 13,  1,  2, 15, 11,  8,  3, 10,  6, 12,  5,  9,  0,  7 },
X          {  0, 15,  7,  4, 14,  2, 13,  1, 10,  6, 12, 11,  9,  5,  3,  8 },
X          {  4,  1, 14,  8, 13,  6,  2, 11, 15, 12,  9,  7,  3, 10,  5,  0 },
X          { 15, 12,  8,  2,  4,  9,  1,  7,  5, 11,  3, 14, 10,  0,  6, 13 }
X        },
X
X        { { 15,  1,  8, 14,  6, 11,  3,  4,  9,  7,  2, 13, 12,  0,  5, 10 },
X          {  3, 13,  4,  7, 15,  2,  8, 14, 12,  0,  1, 10,  6,  9, 11,  5 },
X          {  0, 14,  7, 11, 10,  4, 13,  1,  5,  8, 12,  6,  9,  3,  2, 15 },
X          { 13,  8, 10,  1,  3, 15,  4,  2, 11,  6,  7, 12,  0,  5, 14,  9 }
X        },
X
X        { { 10,  0,  9, 14,  6,  3, 15,  5,  1, 13, 12,  7, 11,  4,  2,  8 },
X          { 13,  7,  0,  9,  3,  4,  6, 10,  2,  8,  5, 14, 12, 11, 15,  1 },
X          { 13,  6,  4,  9,  8, 15,  3,  0, 11,  1,  2, 12,  5, 10, 14,  7 },
X          {  1, 10, 13,  0,  6,  9,  8,  7,  4, 15, 14,  3, 11,  5,  2, 12 }
X        },
X
X        { {  7, 13, 14,  3,  0,  6,  9, 10,  1,  2,  8,  5, 11, 12,  4, 15 },
X          { 13,  8, 11,  5,  6, 15,  0,  3,  4,  7,  2, 12,  1, 10, 14,  9 },
X          { 10,  6,  9,  0, 12, 11,  7, 13, 15,  1,  3, 14,  5,  2,  8,  4 },
X          {  3, 15,  0,  6, 10,  1, 13,  8,  9,  4,  5, 11, 12,  7,  2, 14 }
X        },
X
X        { {  2, 12,  4,  1,  7, 10, 11,  6,  8,  5,  3, 15, 13,  0, 14,  9 },
X          { 14, 11,  2, 12,  4,  7, 13,  1,  5,  0, 15, 10,  3,  9,  8,  6 },
X          {  4,  2,  1, 11, 10, 13,  7,  8, 15,  9, 12,  5,  6,  3,  0, 14 },
X          { 11,  8, 12,  7,  1, 14,  2, 13,  6, 15,  0,  9, 10,  4,  5,  3 }
X        },
X
X        { { 12,  1, 10, 15,  9,  2,  6,  8,  0, 13,  3,  4, 14,  7,  5, 11 },
X          { 10, 15,  4,  2,  7, 12,  9,  5,  6,  1, 13, 14,  0, 11,  3,  8 },
X          {  9, 14, 15,  5,  2,  8, 12,  3,  7,  0,  4, 10,  1, 13, 11,  6 },
X          {  4,  3,  2, 12,  9,  5, 15, 10, 11, 14,  1,  7,  6,  0,  8, 13 }
X        },
X
X        { {  4, 11,  2, 14, 15,  0,  8, 13,  3, 12,  9,  7,  5, 10,  6,  1 },
X          { 13,  0, 11,  7,  4,  9,  1, 10, 14,  3,  5, 12,  2, 15,  8,  6 },
X          {  1,  4, 11, 13, 12,  3,  7, 14, 10, 15,  6,  8,  0,  5,  9,  2 },
X          {  6, 11, 13,  8,  1,  4, 10,  7,  9,  5,  0, 15, 14,  2,  3, 12 }
X        },
X
X        { { 13,  2,  8,  4,  6, 15, 11,  1, 10,  9,  3, 14,  5,  0, 12,  7 },
X          {  1, 15, 13,  8, 10,  3,  7,  4, 12,  5,  6, 11,  0, 14,  9,  2 },
X          {  7, 11,  4,  1,  9, 12, 14,  2,  0,  6, 10, 13, 15,  3,  5,  8 },
X          {  2,  1, 14,  7,  4, 10,  8, 13, 15, 12,  9,  0,  3,  5,  6, 11 }
X        }
X};
X
X/*
X * This is the initial
X * permutation matrix
X */
Xstatic int initial_perm[64] = {
X  58, 50, 42, 34, 26, 18, 10,  2, 60, 52, 44, 36, 28, 20, 12, 4,
X  62, 54, 46, 38, 30, 22, 14,  6, 64, 56, 48, 40, 32, 24, 16, 8,
X  57, 49, 41, 33, 25, 17,  9,  1, 59, 51, 43, 35, 27, 19, 11, 3,
X  61, 53, 45, 37, 29, 21, 13,  5, 63, 55, 47, 39, 31, 23, 15, 7
X};
X
X/*
X * This is the final
X * permutation matrix
X */
Xstatic int final_perm[64] = {
X  40,  8, 48, 16, 56, 24, 64, 32, 39,  7, 47, 15, 55, 23, 63, 31,
X  38,  6, 46, 14, 54, 22, 62, 30, 37,  5, 45, 13, 53, 21, 61, 29,
X  36,  4, 44, 12, 52, 20, 60, 28, 35,  3, 43, 11, 51, 19, 59, 27,
X  34,  2, 42, 10, 50, 18, 58, 26, 33,  1, 41,  9, 49, 17, 57, 25
X};
X
X/*
X * The 16 DES keys in BITMASK format
X */
X#ifdef _UFC_32_
Xlong32 _ufc_keytab[16][2];
X#endif
X#ifdef _UFC_64_
Xlong64 _ufc_keytab[16];
X#endif
X
X#define ascii_to_bin(c) ((c)>='a'?(c-59):(c)>='A'?((c)-53):(c)-'.')
X#define bin_to_ascii(c) ((c)>=38?((c)-38+'a'):(c)>=12?((c)-12+'A'):(c)+'.')
X
X/* Macro to set a bit (0..23) */
X#define BITMASK(i) ( (1<<(11-(i)%12+3)) << ((i)<12?16:0) )
X
X/*
X * sb arrays:
X *
X * Workhorses of the inner loop of the DES implementation.
X * They do sbox lookup, shifting of this  value, 32 bit
X * permutation and E permutation for the next round.
X *
X * Kept in 'BITMASK' format.
X */
X
X#ifdef _UFC_32_
Xlong32 _ufc_sb0[8192], _ufc_sb1[8192], _ufc_sb2[8192], _ufc_sb3[8192];
Xstatic long32 *sb[4] = {_ufc_sb0, _ufc_sb1, _ufc_sb2, _ufc_sb3};
X#endif
X
X#ifdef _UFC_64_
Xlong64 _ufc_sb0[4096], _ufc_sb1[4096], _ufc_sb2[4096], _ufc_sb3[4096];
Xstatic long64 *sb[4] = {_ufc_sb0, _ufc_sb1, _ufc_sb2, _ufc_sb3};
X#endif
X
X/*
X * eperm32tab: do 32 bit permutation and E selection
X *
X * The first index is the byte number in the 32 bit value to be permuted
X *  -  second  -   is the value of this byte
X *  -  third   -   selects the two 32 bit values
X *
X * The table is used and generated internally in init_des to speed it up
X */
Xstatic ufc_long eperm32tab[4][256][2];
X
X/*
X * do_pc1: permform pc1 permutation in the key schedule generation.
X *
X * The first   index is the byte number in the 8 byte ASCII key
X *  -  second    -      -    the two 28 bits halfs of the result
X *  -  third     -   selects the 7 bits actually used of each byte
X *
X * The result is kept with 28 bit per 32 bit with the 4 most significant
X * bits zero.
X */
Xstatic ufc_long do_pc1[8][2][128];
X
X/*
X * do_pc2: permform pc2 permutation in the key schedule generation.
X *
X * The first   index is the septet number in the two 28 bit intermediate values
X *  -  second    -    -  -  septet values
X *
X * Knowledge of the structure of the pc2 permutation is used.
X *
X * The result is kept with 28 bit per 32 bit with the 4 most significant
X * bits zero.
X */
Xstatic ufc_long do_pc2[8][128];
X
X/*
X * efp: undo an extra e selection and do final
X *      permutation giving the DES result.
X *
X *      Invoked 6 bit a time on two 48 bit values
X *      giving two 32 bit longs.
X */
Xstatic ufc_long efp[16][64][2];
X
Xstatic unsigned char bytemask[8]  = {
X  0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01
X};
X
Xstatic ufc_long longmask[32] = {
X  0x80000000, 0x40000000, 0x20000000, 0x10000000,
X  0x08000000, 0x04000000, 0x02000000, 0x01000000,
X  0x00800000, 0x00400000, 0x00200000, 0x00100000,
X  0x00080000, 0x00040000, 0x00020000, 0x00010000,
X  0x00008000, 0x00004000, 0x00002000, 0x00001000,
X  0x00000800, 0x00000400, 0x00000200, 0x00000100,
X  0x00000080, 0x00000040, 0x00000020, 0x00000010,
X  0x00000008, 0x00000004, 0x00000002, 0x00000001
X};
X
X#ifdef DEBUG
X
Xpr_bits(a, n)
X  ufc_long *a;
X  int n;
X  { ufc_long i, j, t, tmp;
X    n /= 8;
X    for(i = 0; i < n; i++) {
X      tmp=0;
X      for(j = 0; j < 8; j++) {
X    t=8*i+j;
X    tmp|=(a[t/24] & BITMASK(t % 24))?bytemask[j]:0;
X      }
X      (void)printf("%02x ",tmp);
X    }
X    printf(" ");
X  }
X
Xstatic set_bits(v, b)
X  ufc_long v;
X  ufc_long *b;
X  { ufc_long i;
X    *b = 0;
X    for(i = 0; i < 24; i++) {
X      if(v & longmask[8 + i])
X    *b |= BITMASK(i);
X    }
X  }
X
X#endif
X
X/*
X * Silly rewrite of 'bzero'. I do so
X * because some machines don't have
X * bzero and some don't have memset.
X */
X
XSTATIC void clearmem(start, cnt)
X  char *start;
X  int cnt;
X  { while(cnt--)
X      *start++ = '\0';
X  }
X
Xstatic int initialized = 0;
X
X/* lookup a 6 bit value in sbox */
X
X#define s_lookup(i,s) sbox[(i)][(((s)>>4) & 0x2)|((s) & 0x1)][((s)>>1) & 0xf];
X
X/*
X * Initialize unit - may be invoked directly
X * by fcrypt users.
X */
X
Xvoid init_des()
X  { int comes_from_bit;
X    int bit, sg;
X    ufc_long j;
X    ufc_long mask1, mask2;
X
X    /*
X     * Create the do_pc1 table used
X     * to affect pc1 permutation
X     * when generating keys
X     */
X    for(bit = 0; bit < 56; bit++) {
X      comes_from_bit  = pc1[bit] - 1;
X      mask1 = bytemask[comes_from_bit % 8 + 1];
X      mask2 = longmask[bit % 28 + 4];
X      for(j = 0; j < 128; j++) {
X    if(j & mask1)
X      do_pc1[comes_from_bit / 8][bit / 28][j] |= mask2;
X      }
X    }
X
X    /*
X     * Create the do_pc2 table used
X     * to affect pc2 permutation when
X     * generating keys
X     */
X    for(bit = 0; bit < 48; bit++) {
X      comes_from_bit  = pc2[bit] - 1;
X      mask1 = bytemask[comes_from_bit % 7 + 1];
X      mask2 = BITMASK(bit % 24);
X      for(j = 0; j < 128; j++) {
X    if(j & mask1)
X      do_pc2[comes_from_bit / 7][j] |= mask2;
X      }
X    }
X
X    /*
X     * Now generate the table used to do combined
X     * 32 bit permutation and e expansion
X     *
X     * We use it because we have to permute 16384 32 bit
X     * longs into 48 bit in order to initialize sb.
X     *
X     * Looping 48 rounds per permutation becomes
X     * just too slow...
X     *
X     */
X
X    clearmem((char*)eperm32tab, sizeof(eperm32tab));
X
X    for(bit = 0; bit < 48; bit++) {
X      ufc_long mask1,comes_from;
X
X      comes_from = perm32[esel[bit]-1]-1;
X      mask1      = bytemask[comes_from % 8];
X
X      for(j = 256; j--;) {
X    if(j & mask1)
X      eperm32tab[comes_from / 8][j][bit / 24] |= BITMASK(bit % 24);
X      }
X    }
X
X    /*
X     * Create the sb tables:
X     *
X     * For each 12 bit segment of an 48 bit intermediate
X     * result, the sb table precomputes the two 4 bit
X     * values of the sbox lookups done with the two 6
X     * bit halves, shifts them to their proper place,
X     * sends them through perm32 and finally E expands
X     * them so that they are ready for the next
X     * DES round.
X     *
X     */
X    for(sg = 0; sg < 4; sg++) {
X      int j1, j2;
X      int s1, s2;
X
X      for(j1 = 0; j1 < 64; j1++) {
X    s1 = s_lookup(2 * sg, j1);
X    for(j2 = 0; j2 < 64; j2++) {
X      ufc_long to_permute, inx;
X
X      s2         = s_lookup(2 * sg + 1, j2);
X      to_permute = ((s1 << 4)  | s2) << (24 - 8 * sg);
X
X#ifdef _UFC_32_
X      inx = ((j1 << 6)  | j2) << 1;
X      sb[sg][inx  ]  = eperm32tab[0][(to_permute >> 24) & 0xff][0];
X      sb[sg][inx+1]  = eperm32tab[0][(to_permute >> 24) & 0xff][1];
X      sb[sg][inx  ] |= eperm32tab[1][(to_permute >> 16) & 0xff][0];
X      sb[sg][inx+1] |= eperm32tab[1][(to_permute >> 16) & 0xff][1];
X        sb[sg][inx  ] |= eperm32tab[2][(to_permute >>  8) & 0xff][0];
X      sb[sg][inx+1] |= eperm32tab[2][(to_permute >>  8) & 0xff][1];
X      sb[sg][inx  ] |= eperm32tab[3][(to_permute)       & 0xff][0];
X      sb[sg][inx+1] |= eperm32tab[3][(to_permute)       & 0xff][1];
X#endif
X#ifdef _UFC_64_
X      inx = ((j1 << 6)  | j2);
X      sb[sg][inx]  =
X        ((long64)eperm32tab[0][(to_permute >> 24) & 0xff][0] << 32) |
X         (long64)eperm32tab[0][(to_permute >> 24) & 0xff][1];
X      sb[sg][inx] |=
X        ((long64)eperm32tab[1][(to_permute >> 16) & 0xff][0] << 32) |
X         (long64)eperm32tab[1][(to_permute >> 16) & 0xff][1];
X        sb[sg][inx] |=
X        ((long64)eperm32tab[2][(to_permute >>  8) & 0xff][0] << 32) |
X         (long64)eperm32tab[2][(to_permute >>  8) & 0xff][1];
X      sb[sg][inx] |=
X        ((long64)eperm32tab[3][(to_permute)       & 0xff][0] << 32) |
X         (long64)eperm32tab[3][(to_permute)       & 0xff][1];
X#endif
X    }
X      }
X    }
X
X    /*
X     * Create an inverse matrix for esel telling
X     * where to plug out bits if undoing it
X     */
X    for(bit=48; bit--;) {
X      e_inverse[esel[bit] - 1     ] = bit;
X      e_inverse[esel[bit] - 1 + 32] = bit + 48;
X    }
X
X    /*
X     * create efp: the matrix used to
X     * undo the E expansion and effect final permutation
X     */
X    clearmem((char*)efp, sizeof efp);
X    for(bit = 0; bit < 64; bit++) {
X      int o_bit, o_long;
X      ufc_long word_value, mask1, mask2;
X      int comes_from_f_bit, comes_from_e_bit;
X      int comes_from_word, bit_within_word;
X
X      /* See where bit i belongs in the two 32 bit long's */
X      o_long = bit / 32; /* 0..1  */
X      o_bit  = bit % 32; /* 0..31 */
X
X      /*
X       * And find a bit in the e permutated value setting this bit.
X       *
X       * Note: the e selection may have selected the same bit several
X       * times. By the initialization of e_inverse, we only look
X       * for one specific instance.
X       */
X      comes_from_f_bit = final_perm[bit] - 1;         /* 0..63 */
X      comes_from_e_bit = e_inverse[comes_from_f_bit]; /* 0..95 */
X      comes_from_word  = comes_from_e_bit / 6;        /* 0..15 */
X      bit_within_word  = comes_from_e_bit % 6;        /* 0..5  */
X
X      mask1 = longmask[bit_within_word + 26];
X      mask2 = longmask[o_bit];
X
X      for(word_value = 64; word_value--;) {
X    if(word_value & mask1)
X      efp[comes_from_word][word_value][o_long] |= mask2;
X      }
X    }
X    initialized++;
X  }
X
X/*
X * Process the elements of the sb table permuting the
X * bits swapped in the expansion by the current salt.
X */
X
X#ifdef _UFC_32_
XSTATIC void shuffle_sb(k, saltbits)
X  long32 *k;
X  ufc_long saltbits;
X  { ufc_long j;
X    long32 x;
X    for(j=4096; j--;) {
X      x = (k[0] ^ k[1]) & (long32)saltbits;
X      *k++ ^= x;
X      *k++ ^= x;
X    }
X  }
X#endif
X
X#ifdef _UFC_64_
XSTATIC void shuffle_sb(k, saltbits)
X  long64 *k;
X  ufc_long saltbits;
X  { ufc_long j;
X    long64 x;
X    for(j=4096; j--;) {
X      x = ((*k >> 32) ^ *k) & (long64)saltbits;
X      *k++ ^= (x << 32) | x;
X    }
X  }
X#endif
X
X/*
X * Setup the unit for a new salt
X * Hopefully we'll not see a new salt in each crypt call.
X */
X
Xstatic unsigned char current_salt[3] = "&&"; /* invalid value */
Xstatic ufc_long current_saltbits = 0;
Xstatic int direction = 0;
X
XSTATIC void setup_salt(s)
X  char *s;
X  { ufc_long i, j, saltbits;
X
X    if(!initialized)
X      init_des();
X
X    if(s[0] == current_salt[0] && s[1] == current_salt[1])
X      return;
X    current_salt[0] = s[0]; current_salt[1] = s[1];
X
X    /*
X     * This is the only crypt change to DES:
X     * entries are swapped in the expansion table
X     * according to the bits set in the salt.
X     */
X    saltbits = 0;
X    for(i = 0; i < 2; i++) {
X      long c=ascii_to_bin(s[i]);
X      if(c < 0 || c > 63)
X    c = 0;
X      for(j = 0; j < 6; j++) {
X    if((c >> j) & 0x1)
X      saltbits |= BITMASK(6 * i + j);
X      }
X    }
X
X    /*
X     * Permute the sb table values
X     * to reflect the changed e
X     * selection table
X     */
X    shuffle_sb(_ufc_sb0, current_saltbits ^ saltbits);
X    shuffle_sb(_ufc_sb1, current_saltbits ^ saltbits);
X    shuffle_sb(_ufc_sb2, current_saltbits ^ saltbits);
X    shuffle_sb(_ufc_sb3, current_saltbits ^ saltbits);
X
X    current_saltbits = saltbits;
X  }
X
XSTATIC void ufc_mk_keytab(key)
X  char *key;
X  { ufc_long v1, v2, *k1;
X    int i;
X#ifdef _UFC_32_
X    long32 v, *k2 = &_ufc_keytab[0][0];
X#endif
X#ifdef _UFC_64_
X    long64 v, *k2 = &_ufc_keytab[0];
X#endif
X
X    v1 = v2 = 0; k1 = &do_pc1[0][0][0];
X    for(i = 8; i--;) {
X      v1 |= k1[*key   & 0x7f]; k1 += 128;
X      v2 |= k1[*key++ & 0x7f]; k1 += 128;
X    }
X
X    for(i = 0; i < 16; i++) {
X      k1 = &do_pc2[0][0];
X
X      v1 = (v1 << rots[i]) | (v1 >> (28 - rots[i]));
X      v  = k1[(v1 >> 21) & 0x7f]; k1 += 128;
X      v |= k1[(v1 >> 14) & 0x7f]; k1 += 128;
X      v |= k1[(v1 >>  7) & 0x7f]; k1 += 128;
X      v |= k1[(v1      ) & 0x7f]; k1 += 128;
X
X#ifdef _UFC_32_
X      *k2++ = v;
X      v = 0;
X#endif
X#ifdef _UFC_64_
X      v <<= 32;
X#endif
X
X      v2 = (v2 << rots[i]) | (v2 >> (28 - rots[i]));
X      v |= k1[(v2 >> 21) & 0x7f]; k1 += 128;
X      v |= k1[(v2 >> 14) & 0x7f]; k1 += 128;
X      v |= k1[(v2 >>  7) & 0x7f]; k1 += 128;
X      v |= k1[(v2      ) & 0x7f];
X
X      *k2++ = v;
X    }
X
X    direction = 0;
X  }
X
X/*
X * Undo an extra E selection and do final permutations
X */
X
Xufc_long *_ufc_dofinalperm(l1, l2, r1, r2)
X  ufc_long l1,l2,r1,r2;
X  { ufc_long v1, v2, x;
X    static ufc_long ary[2];
X
X    x = (l1 ^ l2) & current_saltbits; l1 ^= x; l2 ^= x;
X    x = (r1 ^ r2) & current_saltbits; r1 ^= x; r2 ^= x;
X
X    v1=v2=0; l1 >>= 3; l2 >>= 3; r1 >>= 3; r2 >>= 3;
X
X    v1 |= efp[15][ r2         & 0x3f][0]; v2 |= efp[15][ r2 & 0x3f][1];
X    v1 |= efp[14][(r2 >>= 6)  & 0x3f][0]; v2 |= efp[14][ r2 & 0x3f][1];
X    v1 |= efp[13][(r2 >>= 10) & 0x3f][0]; v2 |= efp[13][ r2 & 0x3f][1];
X    v1 |= efp[12][(r2 >>= 6)  & 0x3f][0]; v2 |= efp[12][ r2 & 0x3f][1];
X
X    v1 |= efp[11][ r1         & 0x3f][0]; v2 |= efp[11][ r1 & 0x3f][1];
X    v1 |= efp[10][(r1 >>= 6)  & 0x3f][0]; v2 |= efp[10][ r1 & 0x3f][1];
X    v1 |= efp[ 9][(r1 >>= 10) & 0x3f][0]; v2 |= efp[ 9][ r1 & 0x3f][1];
X    v1 |= efp[ 8][(r1 >>= 6)  & 0x3f][0]; v2 |= efp[ 8][ r1 & 0x3f][1];
X
X    v1 |= efp[ 7][ l2         & 0x3f][0]; v2 |= efp[ 7][ l2 & 0x3f][1];
X    v1 |= efp[ 6][(l2 >>= 6)  & 0x3f][0]; v2 |= efp[ 6][ l2 & 0x3f][1];
X    v1 |= efp[ 5][(l2 >>= 10) & 0x3f][0]; v2 |= efp[ 5][ l2 & 0x3f][1];
X    v1 |= efp[ 4][(l2 >>= 6)  & 0x3f][0]; v2 |= efp[ 4][ l2 & 0x3f][1];
X
X    v1 |= efp[ 3][ l1         & 0x3f][0]; v2 |= efp[ 3][ l1 & 0x3f][1];
X    v1 |= efp[ 2][(l1 >>= 6)  & 0x3f][0]; v2 |= efp[ 2][ l1 & 0x3f][1];
X    v1 |= efp[ 1][(l1 >>= 10) & 0x3f][0]; v2 |= efp[ 1][ l1 & 0x3f][1];
X    v1 |= efp[ 0][(l1 >>= 6)  & 0x3f][0]; v2 |= efp[ 0][ l1 & 0x3f][1];
X
X    ary[0] = v1; ary[1] = v2;
X    return ary;
X  }
X
X/*
X * crypt only: convert from 64 bit to 11 bit ASCII
X * prefixing with the salt
X */
X
XSTATIC char *output_conversion(v1, v2, salt)
X  ufc_long v1, v2;
X  char *salt;
X  { static char outbuf[14];
X    int i, s;
X
X    outbuf[0] = salt[0];
X    outbuf[1] = salt[1] ? salt[1] : salt[0];
X
X    for(i = 0; i < 5; i++)
X      outbuf[i + 2] = bin_to_ascii((v1 >> (26 - 6 * i)) & 0x3f);
X
X    s  = (v2 & 0xf) << 2;
X    v2 = (v2 >> 2) | ((v1 & 0x3) << 30);
X
X    for(i = 5; i < 10; i++)
X      outbuf[i + 2] = bin_to_ascii((v2 >> (56 - 6 * i)) & 0x3f);
X
X    outbuf[12] = bin_to_ascii(s);
X    outbuf[13] = 0;
X
X    return outbuf;
X  }
X
Xufc_long *_ufc_doit();
X
X/*
X * UNIX crypt function
X */
X
Xchar *crypt(key, salt)
X  char *key, *salt;
X  { ufc_long *s;
X    char ktab[9];
X
X    /*
X     * Hack DES tables according to salt
X     */
X    setup_salt(salt);
X
X    /*
X     * Setup key schedule
X     */
X    clearmem(ktab, sizeof ktab);
X    (void)strncpy(ktab, key, 8);
X    ufc_mk_keytab(ktab);
X
X    /*
X     * Go for the 25 DES encryptions
X     */
X    s = _ufc_doit((ufc_long)0, (ufc_long)0,
X          (ufc_long)0, (ufc_long)0, (ufc_long)25);
X
X    /*
X     * And convert back to 6 bit ASCII
X     */
X    return output_conversion(s[0], s[1], salt);
X  }
X
X/*
X * To make fcrypt users happy.
X * They don't need to call init_des.
X */
X
Xchar *fcrypt(key, salt)
X  char *key;
X  char *salt;
X  { return crypt(key, salt);
X  }
X
X/*
X * UNIX encrypt function. Takes a bitvector
X * represented by one byte per bit and
X * encrypt/decrypt according to edflag
X */
X
Xvoid encrypt(block, edflag)
X  char *block;
X  int edflag;
X  { ufc_long l1, l2, r1, r2, *s;
X    int i;
X
X    /*
X     * Undo any salt changes to E expansion
X     */
X    setup_salt("..");
X
X    /*
X     * Reverse key table if
X     * changing operation (encrypt/decrypt)
X     */
X    if((edflag == 0) != (direction == 0)) {
X      for(i = 0; i < 8; i++) {
X#ifdef _UFC_32_
X    long32 x;
X    x = _ufc_keytab[15-i][0];
X        _ufc_keytab[15-i][0] = _ufc_keytab[i][0];
X        _ufc_keytab[i][0] = x;
X
X    x = _ufc_keytab[15-i][1];
X        _ufc_keytab[15-i][1] = _ufc_keytab[i][1];
X        _ufc_keytab[i][1] = x;
X#endif
X#ifdef _UFC_64_
X    long64 x;
X    x = _ufc_keytab[15-i];
X    _ufc_keytab[15-i] = _ufc_keytab[i];
X    _ufc_keytab[i] = x;
X#endif
X      }
X      direction = edflag;
X    }
X
X    /*
X     * Do initial permutation + E expansion
X     */
X    i = 0;
X    for(l1 = 0; i < 24; i++) {
X      if(block[initial_perm[esel[i]-1]-1])
X    l1 |= BITMASK(i);
X    }
X    for(l2 = 0; i < 48; i++) {
X      if(block[initial_perm[esel[i]-1]-1])
X    l2 |= BITMASK(i-24);
X    }
X
X    i = 0;
X    for(r1 = 0; i < 24; i++) {
X      if(block[initial_perm[esel[i]-1+32]-1])
X    r1 |= BITMASK(i);
X    }
X    for(r2 = 0; i < 48; i++) {
X      if(block[initial_perm[esel[i]-1+32]-1])
X    r2 |= BITMASK(i-24);
X    }
X
X    /*
X     * Do DES inner loops + final conversion
X     */
X    s = _ufc_doit(l1, l2, r1, r2, (ufc_long)1);
X
X    /*
X     * And convert to bit array
X     */
X    l1 = s[0]; r1 = s[1];
X    for(i = 0; i < 32; i++) {
X      *block++ = (l1 & longmask[i]) != 0;
X    }
X    for(i = 0; i < 32; i++) {
X      *block++ = (r1 & longmask[i]) != 0;
X    }
X
X  }
X
X/*
X * UNIX setkey function. Take a 64 bit DES
X * key and setup the machinery.
X */
X
Xvoid setkey(key)
X  char *key;
X  { int i,j;
X    unsigned char c;
X    unsigned char ktab[8];
X
X    setup_salt(".."); /* be sure we're initialized */
X
X    for(i = 0; i < 8; i++) {
X      for(j = 0, c = 0; j < 8; j++)
X    c = c << 1 | *key++;
X      ktab[i] = c >> 1;
X    }
X
X    ufc_mk_keytab(ktab);
X  }
X
X
X
X
X
END_OF_FILE
if test 22326 -ne `wc -c <'crypt_util.c'`; then
    echo shar: \"'crypt_util.c'\" unpacked with wrong size!
fi
# end of 'crypt_util.c'
fi
echo shar: End of archive 2 \(of 2\).
cp /dev/null ark2isdone
MISSING=""
for I in 1 2 ; do
    if test ! -f ark${I}isdone ; then
    MISSING="${MISSING} ${I}"
    fi
done
if test "${MISSING}" = "" ; then
    echo You have unpacked both archives.
    rm -f ark[1-9]isdone
else
    echo You still need to unpack the following archives:
    echo "        " ${MISSING}
fi
##  End of shell archive.
exit 0
exit 0 # Just in case...