968 lines
26 KiB
C
968 lines
26 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Tom Truscott.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)crypt.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include "ruby/missing.h"
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#include "crypt.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <limits.h>
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#ifdef HAVE_PWD_H
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#include <pwd.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#ifndef _PASSWORD_EFMT1
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#define _PASSWORD_EFMT1 '_'
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#endif
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#ifndef numberof
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#define numberof(array) (int)(sizeof(array) / sizeof((array)[0]))
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#endif
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/*
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* UNIX password, and DES, encryption.
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* By Tom Truscott, trt@rti.rti.org,
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* from algorithms by Robert W. Baldwin and James Gillogly.
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*
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* References:
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* "Mathematical Cryptology for Computer Scientists and Mathematicians,"
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* by Wayne Patterson, 1987, ISBN 0-8476-7438-X.
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*
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* "Password Security: A Case History," R. Morris and Ken Thompson,
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* Communications of the ACM, vol. 22, pp. 594-597, Nov. 1979.
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*
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* "DES will be Totally Insecure within Ten Years," M.E. Hellman,
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* IEEE Spectrum, vol. 16, pp. 32-39, July 1979.
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*/
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/* ===== Configuration ==================== */
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/*
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* define "MUST_ALIGN" if your compiler cannot load/store
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* long integers at arbitrary (e.g. odd) memory locations.
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* (Either that or never pass unaligned addresses to des_cipher!)
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*/
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#if !defined(vax)
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#define MUST_ALIGN
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#endif
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#ifdef CHAR_BITS
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#if CHAR_BITS != 8
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#error C_block structure assumes 8 bit characters
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#endif
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#endif
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#ifndef INIT_DES
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# if defined DUMP || defined NO_DES_TABLES
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# define INIT_DES 1
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# else
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# define INIT_DES 0
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# endif
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#endif
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#if !INIT_DES
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# include "des_tables.c"
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# ifdef HAVE_DES_TABLES
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# define init_des() ((void)0)
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# else
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# undef INIT_DES
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# define INIT_DES 1
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# endif
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#endif
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/*
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* Convert twenty-four-bit long in host-order
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* to six bits (and 2 low-order zeroes) per char little-endian format.
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*/
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#define TO_SIX_BIT(rslt, src) { \
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C_block cvt; \
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cvt.b[0] = (unsigned char)(src); (src) >>= 6; \
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cvt.b[1] = (unsigned char)(src); (src) >>= 6; \
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cvt.b[2] = (unsigned char)(src); (src) >>= 6; \
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cvt.b[3] = (unsigned char)(src); \
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(rslt) = (cvt.b32.i0 & 0x3f3f3f3fL) << 2; \
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}
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/*
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* These macros may someday permit efficient use of 64-bit integers.
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*/
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#define ZERO(d,d0,d1) ((d0) = 0, (d1) = 0)
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#define LOAD(d,d0,d1,bl) ((d0) = (bl).b32.i0, (d1) = (bl).b32.i1)
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#define LOADREG(d,d0,d1,s,s0,s1) ((d0) = (s0), (d1) = (s1))
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#define OR(d,d0,d1,bl) ((d0) |= (bl).b32.i0, (d1) |= (bl).b32.i1)
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#define STORE(s,s0,s1,bl) ((bl).b32.i0 = (s0), (bl).b32.i1 = (s1))
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#define DCL_BLOCK(d,d0,d1) long d0, d1
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#if defined(LARGEDATA)
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/* Waste memory like crazy. Also, do permutations in line */
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#define PERM6464(d,d0,d1,cpp,p) \
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LOAD((d),(d0),(d1),(p)[(0<<CHUNKBITS)+(cpp)[0]]); \
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OR ((d),(d0),(d1),(p)[(1<<CHUNKBITS)+(cpp)[1]]); \
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OR ((d),(d0),(d1),(p)[(2<<CHUNKBITS)+(cpp)[2]]); \
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OR ((d),(d0),(d1),(p)[(3<<CHUNKBITS)+(cpp)[3]]); \
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OR (d),(d0),(d1),(p)[(4<<CHUNKBITS)+(cpp)[4]]); \
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OR (d),(d0),(d1),(p)[(5<<CHUNKBITS)+(cpp)[5]]); \
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OR (d),(d0),(d1),(p)[(6<<CHUNKBITS)+(cpp)[6]]); \
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OR (d),(d0),(d1),(p)[(7<<CHUNKBITS)+(cpp)[7]]);
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#define PERM3264(d,d0,d1,cpp,p) \
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LOAD((d),(d0),(d1),(p)[(0<<CHUNKBITS)+(cpp)[0]]); \
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OR ((d),(d0),(d1),(p)[(1<<CHUNKBITS)+(cpp)[1]]); \
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OR ((d),(d0),(d1),(p)[(2<<CHUNKBITS)+(cpp)[2]]); \
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OR ((d),(d0),(d1),(p)[(3<<CHUNKBITS)+(cpp)[3]]);
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#else
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/* "small data" */
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#define PERM6464(d,d0,d1,cpp,p) \
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{ C_block tblk; permute((cpp),&tblk,(p),8); LOAD ((d),(d0),(d1),tblk); }
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#define PERM3264(d,d0,d1,cpp,p) \
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{ C_block tblk; permute((cpp),&tblk,(p),4); LOAD ((d),(d0),(d1),tblk); }
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STATIC void
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permute(const unsigned char *cp, C_block *out, register const C_block *p, int chars_in)
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{
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register DCL_BLOCK(D,D0,D1);
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register const C_block *tp;
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register int t;
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ZERO(D,D0,D1);
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do {
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t = *cp++;
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tp = &p[t&0xf]; OR(D,D0,D1,*tp); p += (1<<CHUNKBITS);
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tp = &p[t>>4]; OR(D,D0,D1,*tp); p += (1<<CHUNKBITS);
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} while (--chars_in > 0);
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STORE(D,D0,D1,*out);
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}
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#endif /* LARGEDATA */
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#ifdef DEBUG
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STATIC void prtab(const char *s, const unsigned char *t, int num_rows);
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#endif
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#if INIT_DES
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/* ===== (mostly) Standard DES Tables ==================== */
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static const unsigned char IP[] = { /* initial permutation */
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58, 50, 42, 34, 26, 18, 10, 2,
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60, 52, 44, 36, 28, 20, 12, 4,
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62, 54, 46, 38, 30, 22, 14, 6,
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64, 56, 48, 40, 32, 24, 16, 8,
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57, 49, 41, 33, 25, 17, 9, 1,
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59, 51, 43, 35, 27, 19, 11, 3,
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61, 53, 45, 37, 29, 21, 13, 5,
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63, 55, 47, 39, 31, 23, 15, 7,
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};
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/* The final permutation is the inverse of IP - no table is necessary */
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static const unsigned char ExpandTr[] = { /* expansion operation */
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32, 1, 2, 3, 4, 5,
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4, 5, 6, 7, 8, 9,
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8, 9, 10, 11, 12, 13,
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12, 13, 14, 15, 16, 17,
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16, 17, 18, 19, 20, 21,
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20, 21, 22, 23, 24, 25,
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24, 25, 26, 27, 28, 29,
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28, 29, 30, 31, 32, 1,
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};
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static const unsigned char PC1[] = { /* permuted choice table 1 */
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57, 49, 41, 33, 25, 17, 9,
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1, 58, 50, 42, 34, 26, 18,
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10, 2, 59, 51, 43, 35, 27,
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19, 11, 3, 60, 52, 44, 36,
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63, 55, 47, 39, 31, 23, 15,
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7, 62, 54, 46, 38, 30, 22,
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14, 6, 61, 53, 45, 37, 29,
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21, 13, 5, 28, 20, 12, 4,
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};
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#endif
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static const unsigned char Rotates[] = { /* PC1 rotation schedule */
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1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1,
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};
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#if INIT_DES
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/* note: each "row" of PC2 is left-padded with bits that make it invertible */
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static const unsigned char PC2[] = { /* permuted choice table 2 */
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9, 18, 14, 17, 11, 24, 1, 5,
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22, 25, 3, 28, 15, 6, 21, 10,
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35, 38, 23, 19, 12, 4, 26, 8,
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43, 54, 16, 7, 27, 20, 13, 2,
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0, 0, 41, 52, 31, 37, 47, 55,
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0, 0, 30, 40, 51, 45, 33, 48,
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0, 0, 44, 49, 39, 56, 34, 53,
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0, 0, 46, 42, 50, 36, 29, 32,
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};
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static const unsigned char S[8][64] = { /* 48->32 bit substitution tables */
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{
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/* S[1] */
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14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
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0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
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4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
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15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13,
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},
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{
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/* S[2] */
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15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
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3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
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0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
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13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9,
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},
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{
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/* S[3] */
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10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
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13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
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13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
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1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12,
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},
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{
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/* S[4] */
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7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
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13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
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10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
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3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14,
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},
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{
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/* S[5] */
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2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
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14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
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4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
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11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3,
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},
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{
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/* S[6] */
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12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
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10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
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9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
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4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13,
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},
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{
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/* S[7] */
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4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
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13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
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1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
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6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12,
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},
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{
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/* S[8] */
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13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
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1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
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7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
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2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11,
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},
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};
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static const unsigned char P32Tr[] = { /* 32-bit permutation function */
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16, 7, 20, 21,
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29, 12, 28, 17,
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1, 15, 23, 26,
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5, 18, 31, 10,
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2, 8, 24, 14,
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32, 27, 3, 9,
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19, 13, 30, 6,
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22, 11, 4, 25,
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};
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static const unsigned char CIFP[] = { /* compressed/interleaved permutation */
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1, 2, 3, 4, 17, 18, 19, 20,
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5, 6, 7, 8, 21, 22, 23, 24,
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9, 10, 11, 12, 25, 26, 27, 28,
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13, 14, 15, 16, 29, 30, 31, 32,
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33, 34, 35, 36, 49, 50, 51, 52,
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37, 38, 39, 40, 53, 54, 55, 56,
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41, 42, 43, 44, 57, 58, 59, 60,
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45, 46, 47, 48, 61, 62, 63, 64,
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};
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#endif
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static const unsigned char itoa64[] = /* 0..63 => ascii-64 */
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"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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/* table that converts chars "./0-9A-Za-z"to integers 0-63. */
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static const unsigned char a64toi[256] = {
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#define A64TOI1(c) \
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((c) == '.' ? 0 : \
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(c) == '/' ? 1 : \
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('0' <= (c) && (c) <= '9') ? (c) - '0' + 2 : \
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('A' <= (c) && (c) <= 'Z') ? (c) - 'A' + 12 : \
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('a' <= (c) && (c) <= 'z') ? (c) - 'a' + 38 : \
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0)
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#define A64TOI4(base) A64TOI1(base+0), A64TOI1(base+1), A64TOI1(base+2), A64TOI1(base+3)
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#define A64TOI16(base) A64TOI4(base+0), A64TOI4(base+4), A64TOI4(base+8), A64TOI4(base+12)
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#define A64TOI64(base) A64TOI16(base+0x00), A64TOI16(base+0x10), A64TOI16(base+0x20), A64TOI16(base+0x30)
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A64TOI64(0x00), A64TOI64(0x40),
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A64TOI64(0x00), A64TOI64(0x40),
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};
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#if INIT_DES
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/* ===== Tables that are initialized at run time ==================== */
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typedef struct {
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/* Initial key schedule permutation */
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C_block PC1ROT[64/CHUNKBITS][1<<CHUNKBITS];
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/* Subsequent key schedule rotation permutations */
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C_block PC2ROT[2][64/CHUNKBITS][1<<CHUNKBITS];
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/* Initial permutation/expansion table */
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C_block IE3264[32/CHUNKBITS][1<<CHUNKBITS];
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/* Table that combines the S, P, and E operations. */
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unsigned long SPE[2][8][64];
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/* compressed/interleaved => final permutation table */
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C_block CF6464[64/CHUNKBITS][1<<CHUNKBITS];
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int ready;
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} des_tables_t;
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static des_tables_t des_tables[1];
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#define des_tables ((const des_tables_t *)des_tables)
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#define PC1ROT (des_tables->PC1ROT)
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#define PC2ROT (des_tables->PC2ROT)
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#define IE3264 (des_tables->IE3264)
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#define SPE (des_tables->SPE)
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#define CF6464 (des_tables->CF6464)
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STATIC void init_des(void);
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STATIC void init_perm(C_block perm[64/CHUNKBITS][1<<CHUNKBITS], unsigned char p[64], int chars_in, int chars_out);
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#endif
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static const C_block constdatablock = {{0}}; /* encryption constant */
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#define KS (data->KS)
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#define cryptresult (data->cryptresult)
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static void des_setkey_r(const unsigned char *key, struct crypt_data *data);
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static void des_cipher_r(const unsigned char *in, unsigned char *out, long salt, int num_iter, struct crypt_data *data);
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#ifdef USE_NONREENTRANT_CRYPT
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static struct crypt_data default_crypt_data;
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#endif
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#ifdef USE_NONREENTRANT_CRYPT
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/*
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* Return a pointer to static data consisting of the "setting"
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* followed by an encryption produced by the "key" and "setting".
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*/
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char *
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crypt(const char *key, const char *setting)
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{
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return crypt_r(key, setting, &default_crypt_data);
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}
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#endif
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/*
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* Return a pointer to data consisting of the "setting" followed by an
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* encryption produced by the "key" and "setting".
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*/
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char *
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crypt_r(const char *key, const char *setting, struct crypt_data *data)
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{
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register char *encp;
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register long i;
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register int t;
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long salt;
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int num_iter, salt_size;
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C_block keyblock, rsltblock;
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for (i = 0; i < 8; i++) {
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if ((t = 2*(unsigned char)(*key)) != 0)
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key++;
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keyblock.b[i] = t;
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}
|
|
des_setkey_r(keyblock.b, data); /* also initializes "a64toi" */
|
|
|
|
encp = &cryptresult[0];
|
|
switch (*setting) {
|
|
case _PASSWORD_EFMT1:
|
|
/*
|
|
* Involve the rest of the password 8 characters at a time.
|
|
*/
|
|
while (*key) {
|
|
des_cipher_r(keyblock.b, keyblock.b, 0L, 1, data);
|
|
for (i = 0; i < 8; i++) {
|
|
if ((t = 2*(unsigned char)(*key)) != 0)
|
|
key++;
|
|
keyblock.b[i] ^= t;
|
|
}
|
|
des_setkey_r(keyblock.b, data);
|
|
}
|
|
|
|
*encp++ = *setting++;
|
|
|
|
/* get iteration count */
|
|
num_iter = 0;
|
|
for (i = 4; --i >= 0; ) {
|
|
if ((t = (unsigned char)setting[i]) == '\0')
|
|
t = '.';
|
|
encp[i] = t;
|
|
num_iter = (num_iter<<6) | a64toi[t];
|
|
}
|
|
setting += 4;
|
|
encp += 4;
|
|
salt_size = 4;
|
|
break;
|
|
default:
|
|
num_iter = 25;
|
|
salt_size = 2;
|
|
}
|
|
|
|
salt = 0;
|
|
for (i = salt_size; --i >= 0; ) {
|
|
if ((t = (unsigned char)setting[i]) == '\0')
|
|
t = '.';
|
|
encp[i] = t;
|
|
salt = (salt<<6) | a64toi[t];
|
|
}
|
|
encp += salt_size;
|
|
des_cipher_r(constdatablock.b, rsltblock.b, salt, num_iter, data);
|
|
|
|
/*
|
|
* Encode the 64 cipher bits as 11 ascii characters.
|
|
*/
|
|
i = ((long)((rsltblock.b[0]<<8) | rsltblock.b[1])<<8) | rsltblock.b[2];
|
|
encp[3] = itoa64[i&0x3f]; i >>= 6;
|
|
encp[2] = itoa64[i&0x3f]; i >>= 6;
|
|
encp[1] = itoa64[i&0x3f]; i >>= 6;
|
|
encp[0] = itoa64[i]; encp += 4;
|
|
i = ((long)((rsltblock.b[3]<<8) | rsltblock.b[4])<<8) | rsltblock.b[5];
|
|
encp[3] = itoa64[i&0x3f]; i >>= 6;
|
|
encp[2] = itoa64[i&0x3f]; i >>= 6;
|
|
encp[1] = itoa64[i&0x3f]; i >>= 6;
|
|
encp[0] = itoa64[i]; encp += 4;
|
|
i = ((long)((rsltblock.b[6])<<8) | rsltblock.b[7])<<2;
|
|
encp[2] = itoa64[i&0x3f]; i >>= 6;
|
|
encp[1] = itoa64[i&0x3f]; i >>= 6;
|
|
encp[0] = itoa64[i];
|
|
|
|
encp[3] = 0;
|
|
|
|
return (cryptresult);
|
|
}
|
|
|
|
/*
|
|
* Set up the key schedule from the key.
|
|
*/
|
|
static void
|
|
des_setkey_r(const unsigned char *key, struct crypt_data *data)
|
|
{
|
|
register DCL_BLOCK(K, K0, K1);
|
|
register const C_block *ptabp;
|
|
register int i;
|
|
C_block *ksp;
|
|
|
|
init_des();
|
|
|
|
PERM6464(K,K0,K1,key,PC1ROT[0]);
|
|
ksp = &KS[0];
|
|
STORE(K&~0x03030303L, K0&~0x03030303L, K1, *ksp);
|
|
for (i = 1; i < numberof(KS); i++) {
|
|
ksp++;
|
|
STORE(K,K0,K1,*ksp);
|
|
ptabp = PC2ROT[Rotates[i]-1][0];
|
|
PERM6464(K,K0,K1,ksp->b,ptabp);
|
|
STORE(K&~0x03030303L, K0&~0x03030303L, K1, *ksp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Encrypt (or decrypt if num_iter < 0) the 8 chars at "in" with abs(num_iter)
|
|
* iterations of DES, using the given 24-bit salt and the pre-computed key
|
|
* schedule, and store the resulting 8 chars at "out" (in == out is permitted).
|
|
*
|
|
* NOTE: the performance of this routine is critically dependent on your
|
|
* compiler and machine architecture.
|
|
*/
|
|
void
|
|
des_cipher_r(const unsigned char *in, unsigned char *out, long salt, int num_iter, struct crypt_data *data)
|
|
{
|
|
/* variables that we want in registers, most important first */
|
|
#if defined(pdp11)
|
|
register int j;
|
|
#endif
|
|
register unsigned long L0, L1, R0, R1, k;
|
|
register const C_block *kp;
|
|
register int ks_inc, loop_count;
|
|
C_block B;
|
|
|
|
L0 = salt;
|
|
TO_SIX_BIT(salt, L0); /* convert to 4*(6+2) format */
|
|
|
|
#if defined(vax) || defined(pdp11)
|
|
salt = ~salt; /* "x &~ y" is faster than "x & y". */
|
|
#define SALT (~salt)
|
|
#else
|
|
#define SALT salt
|
|
#endif
|
|
|
|
#if defined(MUST_ALIGN)
|
|
B.b[0] = in[0]; B.b[1] = in[1]; B.b[2] = in[2]; B.b[3] = in[3];
|
|
B.b[4] = in[4]; B.b[5] = in[5]; B.b[6] = in[6]; B.b[7] = in[7];
|
|
LOAD(L,L0,L1,B);
|
|
#else
|
|
LOAD(L,L0,L1,*(C_block *)in);
|
|
#endif
|
|
LOADREG(R,R0,R1,L,L0,L1);
|
|
L0 &= 0x55555555L;
|
|
L1 &= 0x55555555L;
|
|
L0 = (L0 << 1) | L1; /* L0 is the even-numbered input bits */
|
|
R0 &= 0xaaaaaaaaL;
|
|
R1 = (R1 >> 1) & 0x55555555L;
|
|
L1 = R0 | R1; /* L1 is the odd-numbered input bits */
|
|
STORE(L,L0,L1,B);
|
|
PERM3264(L,L0,L1,B.b, IE3264[0]); /* even bits */
|
|
PERM3264(R,R0,R1,B.b+4,IE3264[0]); /* odd bits */
|
|
|
|
if (num_iter >= 0)
|
|
{ /* encryption */
|
|
kp = &KS[0];
|
|
ks_inc = +1;
|
|
}
|
|
else
|
|
{ /* decryption */
|
|
num_iter = -num_iter;
|
|
kp = &KS[KS_SIZE-1];
|
|
ks_inc = -1;
|
|
}
|
|
|
|
while (--num_iter >= 0) {
|
|
loop_count = 8;
|
|
do {
|
|
|
|
#define SPTAB(t, i) (*(const unsigned long *)((const unsigned char *)(t) + (i)*(sizeof(long)/4)))
|
|
#if defined(gould)
|
|
/* use this if B.b[i] is evaluated just once ... */
|
|
#define DOXOR(x,y,i) (x)^=SPTAB(SPE[0][(i)],B.b[(i)]); (y)^=SPTAB(SPE[1][(i)],B.b[(i)]);
|
|
#else
|
|
#if defined(pdp11)
|
|
/* use this if your "long" int indexing is slow */
|
|
#define DOXOR(x,y,i) j=B.b[(i)]; (x)^=SPTAB(SPE[0][(i)],j); (y)^=SPTAB(SPE[1][(i)],j);
|
|
#else
|
|
/* use this if "k" is allocated to a register ... */
|
|
#define DOXOR(x,y,i) k=B.b[(i)]; (x)^=SPTAB(SPE[0][(i)],k); (y)^=SPTAB(SPE[1][(i)],k);
|
|
#endif
|
|
#endif
|
|
|
|
#define CRUNCH(p0, p1, q0, q1) \
|
|
k = ((q0) ^ (q1)) & SALT; \
|
|
B.b32.i0 = k ^ (q0) ^ kp->b32.i0; \
|
|
B.b32.i1 = k ^ (q1) ^ kp->b32.i1; \
|
|
kp += ks_inc; \
|
|
\
|
|
DOXOR((p0), (p1), 0); \
|
|
DOXOR((p0), (p1), 1); \
|
|
DOXOR((p0), (p1), 2); \
|
|
DOXOR((p0), (p1), 3); \
|
|
DOXOR((p0), (p1), 4); \
|
|
DOXOR((p0), (p1), 5); \
|
|
DOXOR((p0), (p1), 6); \
|
|
DOXOR((p0), (p1), 7);
|
|
|
|
CRUNCH(L0, L1, R0, R1);
|
|
CRUNCH(R0, R1, L0, L1);
|
|
} while (--loop_count != 0);
|
|
kp -= (ks_inc*KS_SIZE);
|
|
|
|
|
|
/* swap L and R */
|
|
L0 ^= R0; L1 ^= R1;
|
|
R0 ^= L0; R1 ^= L1;
|
|
L0 ^= R0; L1 ^= R1;
|
|
}
|
|
|
|
/* store the encrypted (or decrypted) result */
|
|
L0 = ((L0 >> 3) & 0x0f0f0f0fL) | ((L1 << 1) & 0xf0f0f0f0L);
|
|
L1 = ((R0 >> 3) & 0x0f0f0f0fL) | ((R1 << 1) & 0xf0f0f0f0L);
|
|
STORE(L,L0,L1,B);
|
|
PERM6464(L,L0,L1,B.b, CF6464[0]);
|
|
#if defined(MUST_ALIGN)
|
|
STORE(L,L0,L1,B);
|
|
out[0] = B.b[0]; out[1] = B.b[1]; out[2] = B.b[2]; out[3] = B.b[3];
|
|
out[4] = B.b[4]; out[5] = B.b[5]; out[6] = B.b[6]; out[7] = B.b[7];
|
|
#else
|
|
STORE(L,L0,L1,*(C_block *)out);
|
|
#endif
|
|
}
|
|
|
|
#undef des_tables
|
|
#undef KS
|
|
#undef cryptresult
|
|
|
|
#if INIT_DES
|
|
/*
|
|
* Initialize various tables. This need only be done once. It could even be
|
|
* done at compile time, if the compiler were capable of that sort of thing.
|
|
*/
|
|
STATIC void
|
|
init_des(void)
|
|
{
|
|
register int i, j;
|
|
register long k;
|
|
register int tableno;
|
|
unsigned char perm[64], tmp32[32];
|
|
|
|
if (des_tables->ready) return;
|
|
|
|
/*
|
|
* PC1ROT - bit reverse, then PC1, then Rotate, then PC2.
|
|
*/
|
|
for (i = 0; i < 64; i++)
|
|
perm[i] = 0;
|
|
for (i = 0; i < 64; i++) {
|
|
if ((k = PC2[i]) == 0)
|
|
continue;
|
|
k += Rotates[0]-1;
|
|
if ((k%28) < Rotates[0]) k -= 28;
|
|
k = PC1[k];
|
|
if (k > 0) {
|
|
k--;
|
|
k = (k|07) - (k&07);
|
|
k++;
|
|
}
|
|
perm[i] = (unsigned char)k;
|
|
}
|
|
#ifdef DEBUG
|
|
prtab("pc1tab", perm, 8);
|
|
#endif
|
|
init_perm(PC1ROT, perm, 8, 8);
|
|
|
|
/*
|
|
* PC2ROT - PC2 inverse, then Rotate (once or twice), then PC2.
|
|
*/
|
|
for (j = 0; j < 2; j++) {
|
|
unsigned char pc2inv[64];
|
|
for (i = 0; i < 64; i++)
|
|
perm[i] = pc2inv[i] = 0;
|
|
for (i = 0; i < 64; i++) {
|
|
if ((k = PC2[i]) == 0)
|
|
continue;
|
|
pc2inv[k-1] = i+1;
|
|
}
|
|
for (i = 0; i < 64; i++) {
|
|
if ((k = PC2[i]) == 0)
|
|
continue;
|
|
k += j;
|
|
if ((k%28) <= j) k -= 28;
|
|
perm[i] = pc2inv[k];
|
|
}
|
|
#ifdef DEBUG
|
|
prtab("pc2tab", perm, 8);
|
|
#endif
|
|
init_perm(PC2ROT[j], perm, 8, 8);
|
|
}
|
|
|
|
/*
|
|
* Bit reverse, then initial permutation, then expansion.
|
|
*/
|
|
for (i = 0; i < 8; i++) {
|
|
for (j = 0; j < 8; j++) {
|
|
k = (j < 2)? 0: IP[ExpandTr[i*6+j-2]-1];
|
|
if (k > 32)
|
|
k -= 32;
|
|
else if (k > 0)
|
|
k--;
|
|
if (k > 0) {
|
|
k--;
|
|
k = (k|07) - (k&07);
|
|
k++;
|
|
}
|
|
perm[i*8+j] = (unsigned char)k;
|
|
}
|
|
}
|
|
#ifdef DEBUG
|
|
prtab("ietab", perm, 8);
|
|
#endif
|
|
init_perm(IE3264, perm, 4, 8);
|
|
|
|
/*
|
|
* Compression, then final permutation, then bit reverse.
|
|
*/
|
|
for (i = 0; i < 64; i++) {
|
|
k = IP[CIFP[i]-1];
|
|
if (k > 0) {
|
|
k--;
|
|
k = (k|07) - (k&07);
|
|
k++;
|
|
}
|
|
perm[k-1] = i+1;
|
|
}
|
|
#ifdef DEBUG
|
|
prtab("cftab", perm, 8);
|
|
#endif
|
|
init_perm(CF6464, perm, 8, 8);
|
|
|
|
/*
|
|
* SPE table
|
|
*/
|
|
for (i = 0; i < 48; i++)
|
|
perm[i] = P32Tr[ExpandTr[i]-1];
|
|
for (tableno = 0; tableno < 8; tableno++) {
|
|
for (j = 0; j < 64; j++) {
|
|
k = (((j >> 0) &01) << 5)|
|
|
(((j >> 1) &01) << 3)|
|
|
(((j >> 2) &01) << 2)|
|
|
(((j >> 3) &01) << 1)|
|
|
(((j >> 4) &01) << 0)|
|
|
(((j >> 5) &01) << 4);
|
|
k = S[tableno][k];
|
|
k = (((k >> 3)&01) << 0)|
|
|
(((k >> 2)&01) << 1)|
|
|
(((k >> 1)&01) << 2)|
|
|
(((k >> 0)&01) << 3);
|
|
for (i = 0; i < 32; i++)
|
|
tmp32[i] = 0;
|
|
for (i = 0; i < 4; i++)
|
|
tmp32[4 * tableno + i] = (unsigned char)(k >> i) & 01;
|
|
k = 0;
|
|
for (i = 24; --i >= 0; )
|
|
k = (k<<1) | tmp32[perm[i]-1];
|
|
TO_SIX_BIT(SPE[0][tableno][j], k);
|
|
k = 0;
|
|
for (i = 24; --i >= 0; )
|
|
k = (k<<1) | tmp32[perm[i+24]-1];
|
|
TO_SIX_BIT(SPE[1][tableno][j], k);
|
|
}
|
|
}
|
|
|
|
des_tables->ready = 1;
|
|
}
|
|
|
|
/*
|
|
* Initialize "perm" to represent transformation "p", which rearranges
|
|
* (perhaps with expansion and/or contraction) one packed array of bits
|
|
* (of size "chars_in" characters) into another array (of size "chars_out"
|
|
* characters).
|
|
*
|
|
* "perm" must be all-zeroes on entry to this routine.
|
|
*/
|
|
STATIC void
|
|
init_perm(C_block perm[64/CHUNKBITS][1<<CHUNKBITS],
|
|
unsigned char p[64], int chars_in, int chars_out)
|
|
{
|
|
register int i, j, k, l;
|
|
|
|
for (k = 0; k < chars_out*8; k++) { /* each output bit position */
|
|
l = p[k] - 1; /* where this bit comes from */
|
|
if (l < 0)
|
|
continue; /* output bit is always 0 */
|
|
i = l>>LGCHUNKBITS; /* which chunk this bit comes from */
|
|
l = 1<<(l&(CHUNKBITS-1)); /* mask for this bit */
|
|
for (j = 0; j < (1<<CHUNKBITS); j++) { /* each chunk value */
|
|
if ((j & l) != 0)
|
|
perm[i][j].b[k>>3] |= 1<<(k&07);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* "setkey" routine (for backwards compatibility)
|
|
*/
|
|
#ifdef USE_NONREENTRANT_CRYPT
|
|
void
|
|
setkey(const char *key)
|
|
{
|
|
setkey_r(key, &default_crypt_data);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
setkey_r(const char *key, struct crypt_data *data)
|
|
{
|
|
register int i, j, k;
|
|
C_block keyblock;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
k = 0;
|
|
for (j = 0; j < 8; j++) {
|
|
k <<= 1;
|
|
k |= (unsigned char)*key++;
|
|
}
|
|
keyblock.b[i] = k;
|
|
}
|
|
des_setkey_r(keyblock.b, data);
|
|
}
|
|
|
|
/*
|
|
* "encrypt" routine (for backwards compatibility)
|
|
*/
|
|
#ifdef USE_NONREENTRANT_CRYPT
|
|
void
|
|
encrypt(char *block, int flag)
|
|
{
|
|
encrypt_r(block, flag, &default_crypt_data);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
encrypt_r(char *block, int flag, struct crypt_data *data)
|
|
{
|
|
register int i, j, k;
|
|
C_block cblock;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
k = 0;
|
|
for (j = 0; j < 8; j++) {
|
|
k <<= 1;
|
|
k |= (unsigned char)*block++;
|
|
}
|
|
cblock.b[i] = k;
|
|
}
|
|
des_cipher_r(cblock.b, cblock.b, 0L, (flag ? -1: 1), data);
|
|
for (i = 7; i >= 0; i--) {
|
|
k = cblock.b[i];
|
|
for (j = 7; j >= 0; j--) {
|
|
*--block = k&01;
|
|
k >>= 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
STATIC void
|
|
prtab(const char *s, const unsigned char *t, int num_rows)
|
|
{
|
|
register int i, j;
|
|
|
|
(void)printf("%s:\n", s);
|
|
for (i = 0; i < num_rows; i++) {
|
|
for (j = 0; j < 8; j++) {
|
|
(void)printf("%3d", t[i*8+j]);
|
|
}
|
|
(void)printf("\n");
|
|
}
|
|
(void)printf("\n");
|
|
}
|
|
#endif
|
|
|
|
#ifdef DUMP
|
|
void
|
|
dump_block(const C_block *block)
|
|
{
|
|
int i;
|
|
printf("{{");
|
|
for (i = 0; i < numberof(block->b); ++i) {
|
|
printf("%3d,", block->b[i]);
|
|
}
|
|
printf("}},\n");
|
|
}
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
int i, j, k;
|
|
init_des();
|
|
|
|
printf("#ifndef HAVE_DES_TABLES\n\n");
|
|
printf("/* Initial key schedule permutation */\n");
|
|
printf("static const C_block PC1ROT[64/CHUNKBITS][1<<CHUNKBITS] = {\n");
|
|
for (i = 0; i < numberof(PC1ROT); ++i) {
|
|
printf("\t{\n");
|
|
for (j = 0; j < numberof(PC1ROT[0]); ++j) {
|
|
printf("\t\t");
|
|
dump_block(&PC1ROT[i][j]);
|
|
}
|
|
printf("\t},\n");
|
|
}
|
|
printf("};\n\n");
|
|
|
|
printf("/* Subsequent key schedule rotation permutations */\n");
|
|
printf("static const C_block PC2ROT[2][64/CHUNKBITS][1<<CHUNKBITS] = {\n");
|
|
for (i = 0; i < numberof(PC2ROT); ++i) {
|
|
printf("\t{\n");
|
|
for (j = 0; j < numberof(PC2ROT[0]); ++j) {
|
|
printf("\t\t{\n");
|
|
for (k = 0; k < numberof(PC2ROT[0][0]); ++k) {
|
|
printf("\t\t\t");
|
|
dump_block(&PC2ROT[i][j][k]);
|
|
}
|
|
printf("\t\t},\n");
|
|
}
|
|
printf("\t},\n");
|
|
}
|
|
printf("};\n\n");
|
|
|
|
printf("/* Initial permutation/expansion table */\n");
|
|
printf("static const C_block IE3264[32/CHUNKBITS][1<<CHUNKBITS] = {\n");
|
|
for (i = 0; i < numberof(IE3264); ++i) {
|
|
printf("\t{\n");
|
|
for (j = 0; j < numberof(IE3264[0]); ++j) {
|
|
printf("\t\t");
|
|
dump_block(&IE3264[i][j]);
|
|
}
|
|
printf("\t},\n");
|
|
}
|
|
printf("};\n\n");
|
|
|
|
printf("/* Table that combines the S, P, and E operations. */\n");
|
|
printf("static const unsigned long SPE[2][8][64] = {\n");
|
|
for (i = 0; i < numberof(SPE); ++i) {
|
|
printf("\t{\n");
|
|
for (j = 0; j < numberof(SPE[0]); ++j) {
|
|
int r = 0;
|
|
printf("\t\t{");
|
|
for (k = 0; k < numberof(SPE[0][0]); ++k) {
|
|
if (r == 0) printf("\n\t\t\t");
|
|
printf("%#10lx,", SPE[i][j][k]);
|
|
if (++r == 4) r = 0;
|
|
}
|
|
printf("\n\t\t},\n");
|
|
}
|
|
printf("\t},\n");
|
|
}
|
|
printf("};\n\n");
|
|
|
|
printf("/* compressed/interleaved => final permutation table */\n");
|
|
printf("static const C_block CF6464[64/CHUNKBITS][1<<CHUNKBITS] = {\n");
|
|
for (i = 0; i < numberof(CF6464); ++i) {
|
|
printf("\t{\n");
|
|
for (j = 0; j < numberof(CF6464[0]); ++j) {
|
|
printf("\t\t");
|
|
dump_block(&CF6464[i][j]);
|
|
}
|
|
printf("\t},\n");
|
|
}
|
|
printf("};\n\n");
|
|
printf("#define HAVE_DES_TABLES 1\n""#endif\n");
|
|
|
|
return 0;
|
|
}
|
|
#endif
|