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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1989, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Tom Truscott.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#include <sys/cdefs.h>
+#include <unistd.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <pwd.h>
+#include <stdlib.h>
+
+/*
+ * UNIX password, and DES, encryption.
+ * By Tom Truscott, trt@rti.rti.org,
+ * from algorithms by Robert W. Baldwin and James Gillogly.
+ *
+ * References:
+ * "Mathematical Cryptology for Computer Scientists and Mathematicians,"
+ * by Wayne Patterson, 1987, ISBN 0-8476-7438-X.
+ *
+ * "Password Security: A Case History," R. Morris and Ken Thompson,
+ * Communications of the ACM, vol. 22, pp. 594-597, Nov. 1979.
+ *
+ * "DES will be Totally Insecure within Ten Years," M.E. Hellman,
+ * IEEE Spectrum, vol. 16, pp. 32-39, July 1979.
+ */
+
+/* ===== Configuration ==================== */
+
+/*
+ * define "MUST_ALIGN" if your compiler cannot load/store
+ * long integers at arbitrary (e.g. odd) memory locations.
+ * (Either that or never pass unaligned addresses to __crypt_des_cipher!)
+ */
+#if !defined(vax)
+#define MUST_ALIGN
+#endif
+
+#ifdef CHAR_BITS
+#if CHAR_BITS != 8
+ #error C_block structure assumes 8 bit characters
+#endif
+#endif
+
+/*
+ * define "LONG_IS_32_BITS" only if sizeof(long)==4.
+ * This avoids use of bit fields (your compiler may be sloppy with them).
+ */
+#if !defined(cray) && (LONG_BIT == 32)
+#define LONG_IS_32_BITS
+#endif
+
+/*
+ * define "B64" to be the declaration for a 64 bit integer.
+ * XXX this feature is currently unused, see "endian" comment below.
+ */
+#if defined(cray)
+#define B64 long
+#endif
+#if defined(convex)
+#define B64 long long
+#endif
+
+/*
+ * define "LARGEDATA" to get faster permutations, by using about 72 kilobytes
+ * of lookup tables. This speeds up __crypt_des_setkey() and __crypt_des_cipher(), but has
+ * little effect on crypt().
+ */
+#if defined(notdef)
+#define LARGEDATA
+#endif
+
+/* compile with "-DSTATIC=int" when profiling */
+#ifndef STATIC
+#define STATIC static
+#endif
+#ifndef BUILDING_VARIANT
+STATIC void init_des(), init_perm(), permute();
+#endif /* BUILDING_VARIANT */
+__private_extern__ int __crypt_des_cipher(), __crypt_des_setkey();
+#ifdef DEBUG
+STATIC prtab();
+#endif
+
+/* ==================================== */
+
+/*
+ * Cipher-block representation (Bob Baldwin):
+ *
+ * DES operates on groups of 64 bits, numbered 1..64 (sigh). One
+ * representation is to store one bit per byte in an array of bytes. Bit N of
+ * the NBS spec is stored as the LSB of the Nth byte (index N-1) in the array.
+ * Another representation stores the 64 bits in 8 bytes, with bits 1..8 in the
+ * first byte, 9..16 in the second, and so on. The DES spec apparently has
+ * bit 1 in the MSB of the first byte, but that is particularly noxious so we
+ * bit-reverse each byte so that bit 1 is the LSB of the first byte, bit 8 is
+ * the MSB of the first byte. Specifically, the 64-bit input data and key are
+ * converted to LSB format, and the output 64-bit block is converted back into
+ * MSB format.
+ *
+ * DES operates internally on groups of 32 bits which are expanded to 48 bits
+ * by permutation E and shrunk back to 32 bits by the S boxes. To speed up
+ * the computation, the expansion is applied only once, the expanded
+ * representation is maintained during the encryption, and a compression
+ * permutation is applied only at the end. To speed up the S-box lookups,
+ * the 48 bits are maintained as eight 6 bit groups, one per byte, which
+ * directly feed the eight S-boxes. Within each byte, the 6 bits are the
+ * most significant ones. The low two bits of each byte are zero. (Thus,
+ * bit 1 of the 48 bit E expansion is stored as the "4"-valued bit of the
+ * first byte in the eight byte representation, bit 2 of the 48 bit value is
+ * the "8"-valued bit, and so on.) In fact, a combined "SPE"-box lookup is
+ * used, in which the output is the 64 bit result of an S-box lookup which
+ * has been permuted by P and expanded by E, and is ready for use in the next
+ * iteration. Two 32-bit wide tables, SPE[0] and SPE[1], are used for this
+ * lookup. Since each byte in the 48 bit path is a multiple of four, indexed
+ * lookup of SPE[0] and SPE[1] is simple and fast. The key schedule and
+ * "salt" are also converted to this 8*(6+2) format. The SPE table size is
+ * 8*64*8 = 4K bytes.
+ *
+ * To speed up bit-parallel operations (such as XOR), the 8 byte
+ * representation is "union"ed with 32 bit values "i0" and "i1", and, on
+ * machines which support it, a 64 bit value "b64". This data structure,
+ * "C_block", has two problems. First, alignment restrictions must be
+ * honored. Second, the byte-order (e.g. little-endian or big-endian) of
+ * the architecture becomes visible.
+ *
+ * The byte-order problem is unfortunate, since on the one hand it is good
+ * to have a machine-independent C_block representation (bits 1..8 in the
+ * first byte, etc.), and on the other hand it is good for the LSB of the
+ * first byte to be the LSB of i0. We cannot have both these things, so we
+ * currently use the "little-endian" representation and avoid any multi-byte
+ * operations that depend on byte order. This largely precludes use of the
+ * 64-bit datatype since the relative order of i0 and i1 are unknown. It
+ * also inhibits grouping the SPE table to look up 12 bits at a time. (The
+ * 12 bits can be stored in a 16-bit field with 3 low-order zeroes and 1
+ * high-order zero, providing fast indexing into a 64-bit wide SPE.) On the
+ * other hand, 64-bit datatypes are currently rare, and a 12-bit SPE lookup
+ * requires a 128 kilobyte table, so perhaps this is not a big loss.
+ *
+ * Permutation representation (Jim Gillogly):
+ *
+ * A transformation is defined by its effect on each of the 8 bytes of the
+ * 64-bit input. For each byte we give a 64-bit output that has the bits in
+ * the input distributed appropriately. The transformation is then the OR
+ * of the 8 sets of 64-bits. This uses 8*256*8 = 16K bytes of storage for
+ * each transformation. Unless LARGEDATA is defined, however, a more compact
+ * table is used which looks up 16 4-bit "chunks" rather than 8 8-bit chunks.
+ * The smaller table uses 16*16*8 = 2K bytes for each transformation. This
+ * is slower but tolerable, particularly for password encryption in which
+ * the SPE transformation is iterated many times. The small tables total 9K
+ * bytes, the large tables total 72K bytes.
+ *
+ * The transformations used are:
+ * IE3264: MSB->LSB conversion, initial permutation, and expansion.
+ * This is done by collecting the 32 even-numbered bits and applying
+ * a 32->64 bit transformation, and then collecting the 32 odd-numbered
+ * bits and applying the same transformation. Since there are only
+ * 32 input bits, the IE3264 transformation table is half the size of
+ * the usual table.
+ * CF6464: Compression, final permutation, and LSB->MSB conversion.
+ * This is done by two trivial 48->32 bit compressions to obtain
+ * a 64-bit block (the bit numbering is given in the "CIFP" table)
+ * followed by a 64->64 bit "cleanup" transformation. (It would
+ * be possible to group the bits in the 64-bit block so that 2
+ * identical 32->32 bit transformations could be used instead,
+ * saving a factor of 4 in space and possibly 2 in time, but
+ * byte-ordering and other complications rear their ugly head.
+ * Similar opportunities/problems arise in the key schedule
+ * transforms.)
+ * PC1ROT: MSB->LSB, PC1 permutation, rotate, and PC2 permutation.
+ * This admittedly baroque 64->64 bit transformation is used to
+ * produce the first code (in 8*(6+2) format) of the key schedule.
+ * PC2ROT[0]: Inverse PC2 permutation, rotate, and PC2 permutation.
+ * It would be possible to define 15 more transformations, each
+ * with a different rotation, to generate the entire key schedule.
+ * To save space, however, we instead permute each code into the
+ * next by using a transformation that "undoes" the PC2 permutation,
+ * rotates the code, and then applies PC2. Unfortunately, PC2
+ * transforms 56 bits into 48 bits, dropping 8 bits, so PC2 is not
+ * invertible. We get around that problem by using a modified PC2
+ * which retains the 8 otherwise-lost bits in the unused low-order
+ * bits of each byte. The low-order bits are cleared when the
+ * codes are stored into the key schedule.
+ * PC2ROT[1]: Same as PC2ROT[0], but with two rotations.
+ * This is faster than applying PC2ROT[0] twice,
+ *
+ * The Bell Labs "salt" (Bob Baldwin):
+ *
+ * The salting is a simple permutation applied to the 48-bit result of E.
+ * Specifically, if bit i (1 <= i <= 24) of the salt is set then bits i and
+ * i+24 of the result are swapped. The salt is thus a 24 bit number, with
+ * 16777216 possible values. (The original salt was 12 bits and could not
+ * swap bits 13..24 with 36..48.)
+ *
+ * It is possible, but ugly, to warp the SPE table to account for the salt
+ * permutation. Fortunately, the conditional bit swapping requires only
+ * about four machine instructions and can be done on-the-fly with about an
+ * 8% performance penalty.
+ */
+
+typedef union {
+ unsigned char b[8];
+ struct {
+#if defined(LONG_IS_32_BITS)
+ /* long is often faster than a 32-bit bit field */
+ long i0;
+ long i1;
+#else
+ long i0: 32;
+ long i1: 32;
+#endif
+ } b32;
+#if defined(B64)
+ B64 b64;
+#endif
+} C_block;
+
+/*
+ * Convert twenty-four-bit long in host-order
+ * to six bits (and 2 low-order zeroes) per char little-endian format.
+ */
+#define TO_SIX_BIT(rslt, src) { \
+ C_block cvt; \
+ cvt.b[0] = src; src >>= 6; \
+ cvt.b[1] = src; src >>= 6; \
+ cvt.b[2] = src; src >>= 6; \
+ cvt.b[3] = src; \
+ rslt = (cvt.b32.i0 & 0x3f3f3f3fL) << 2; \
+ }
+
+/*
+ * These macros may someday permit efficient use of 64-bit integers.
+ */
+#define ZERO(d,d0,d1) d0 = 0, d1 = 0
+#define LOAD(d,d0,d1,bl) d0 = (bl).b32.i0, d1 = (bl).b32.i1
+#define LOADREG(d,d0,d1,s,s0,s1) d0 = s0, d1 = s1
+#define OR(d,d0,d1,bl) d0 |= (bl).b32.i0, d1 |= (bl).b32.i1
+#define STORE(s,s0,s1,bl) (bl).b32.i0 = s0, (bl).b32.i1 = s1
+#define DCL_BLOCK(d,d0,d1) long d0, d1
+
+#if defined(LARGEDATA)
+ /* Waste memory like crazy. Also, do permutations in line */
+#define LGCHUNKBITS 3
+#define CHUNKBITS (1<<LGCHUNKBITS)
+#define PERM6464(d,d0,d1,cpp,p) \
+ LOAD(d,d0,d1,(p)[(0<<CHUNKBITS)+(cpp)[0]]); \
+ OR (d,d0,d1,(p)[(1<<CHUNKBITS)+(cpp)[1]]); \
+ OR (d,d0,d1,(p)[(2<<CHUNKBITS)+(cpp)[2]]); \
+ OR (d,d0,d1,(p)[(3<<CHUNKBITS)+(cpp)[3]]); \
+ OR (d,d0,d1,(p)[(4<<CHUNKBITS)+(cpp)[4]]); \
+ OR (d,d0,d1,(p)[(5<<CHUNKBITS)+(cpp)[5]]); \
+ OR (d,d0,d1,(p)[(6<<CHUNKBITS)+(cpp)[6]]); \
+ OR (d,d0,d1,(p)[(7<<CHUNKBITS)+(cpp)[7]]);
+#define PERM3264(d,d0,d1,cpp,p) \
+ LOAD(d,d0,d1,(p)[(0<<CHUNKBITS)+(cpp)[0]]); \
+ OR (d,d0,d1,(p)[(1<<CHUNKBITS)+(cpp)[1]]); \
+ OR (d,d0,d1,(p)[(2<<CHUNKBITS)+(cpp)[2]]); \
+ OR (d,d0,d1,(p)[(3<<CHUNKBITS)+(cpp)[3]]);
+#else
+ /* "small data" */
+#define LGCHUNKBITS 2
+#define CHUNKBITS (1<<LGCHUNKBITS)
+#define PERM6464(d,d0,d1,cpp,p) \
+ { C_block tblk; permute(cpp,&tblk,p,8); LOAD (d,d0,d1,tblk); }
+#define PERM3264(d,d0,d1,cpp,p) \
+ { C_block tblk; permute(cpp,&tblk,p,4); LOAD (d,d0,d1,tblk); }
+
+#ifndef BUILDING_VARIANT
+STATIC void permute(cp, out, p, chars_in)
+ unsigned char *cp;
+ C_block *out;
+ register C_block *p;
+ int chars_in;
+{
+ register DCL_BLOCK(D,D0,D1);
+ register C_block *tp;
+ register int t;
+
+ ZERO(D,D0,D1);
+ do {
+ t = *cp++;
+ tp = &p[t&0xf]; OR(D,D0,D1,*tp); p += (1<<CHUNKBITS);
+ tp = &p[t>>4]; OR(D,D0,D1,*tp); p += (1<<CHUNKBITS);
+ } while (--chars_in > 0);
+ STORE(D,D0,D1,*out);
+}
+#endif /* BUILDING_VARIANT */
+#endif /* LARGEDATA */
+
+#ifndef BUILDING_VARIANT
+__private_extern__ int __crypt_des_setkey_called = 0;
+#else /* BUILDING_VARIANT */
+__private_extern__ int __crypt_des_setkey_called;
+#endif /* BUILDING_VARIANT */
+
+/* ===== (mostly) Standard DES Tables ==================== */
+
+#ifndef BUILDING_VARIANT
+static unsigned char IP[] = { /* initial permutation */
+ 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,
+};
+
+/* The final permutation is the inverse of IP - no table is necessary */
+
+static unsigned char ExpandTr[] = { /* expansion operation */
+ 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 unsigned char PC1[] = { /* permuted choice table 1 */
+ 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 unsigned char Rotates[] = { /* PC1 rotation schedule */
+ 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1,
+};
+
+/* note: each "row" of PC2 is left-padded with bits that make it invertible */
+static unsigned char PC2[] = { /* permuted choice table 2 */
+ 9, 18, 14, 17, 11, 24, 1, 5,
+ 22, 25, 3, 28, 15, 6, 21, 10,
+ 35, 38, 23, 19, 12, 4, 26, 8,
+ 43, 54, 16, 7, 27, 20, 13, 2,
+
+ 0, 0, 41, 52, 31, 37, 47, 55,
+ 0, 0, 30, 40, 51, 45, 33, 48,
+ 0, 0, 44, 49, 39, 56, 34, 53,
+ 0, 0, 46, 42, 50, 36, 29, 32,
+};
+
+static const unsigned char S[8][64] = { /* 48->32 bit substitution tables */
+ { /* S[1] */
+ 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,
+ },
+ { /* S[2] */
+ 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,
+ },
+ { /* S[3] */
+ 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,
+ },
+ { /* S[4] */
+ 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,
+ },
+ { /* S[5] */
+ 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,
+ },
+ { /* S[6] */
+ 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,
+ },
+ { /* S[7] */
+ 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,
+ },
+ { /* S[8] */
+ 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 unsigned char P32Tr[] = { /* 32-bit permutation function */
+ 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 CIFP[] = { /* compressed/interleaved permutation */
+ 1, 2, 3, 4, 17, 18, 19, 20,
+ 5, 6, 7, 8, 21, 22, 23, 24,
+ 9, 10, 11, 12, 25, 26, 27, 28,
+ 13, 14, 15, 16, 29, 30, 31, 32,
+
+ 33, 34, 35, 36, 49, 50, 51, 52,
+ 37, 38, 39, 40, 53, 54, 55, 56,
+ 41, 42, 43, 44, 57, 58, 59, 60,
+ 45, 46, 47, 48, 61, 62, 63, 64,
+};
+
+static unsigned char itoa64[] = /* 0..63 => ascii-64 */
+ "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+
+/* ===== Tables that are initialized at run time ==================== */
+
+
+static unsigned char a64toi[128]; /* ascii-64 => 0..63 */
+
+/* Initial key schedule permutation */
+// static C_block PC1ROT[64/CHUNKBITS][1<<CHUNKBITS];
+static C_block *PC1ROT;
+
+/* Subsequent key schedule rotation permutations */
+// static C_block PC2ROT[2][64/CHUNKBITS][1<<CHUNKBITS];
+static C_block *PC2ROT[2];
+
+/* Initial permutation/expansion table */
+// static C_block IE3264[32/CHUNKBITS][1<<CHUNKBITS];
+static C_block *IE3264;
+
+/* Table that combines the S, P, and E operations. */
+// static long SPE[2][8][64];
+static long *SPE;
+
+/* compressed/interleaved => final permutation table */
+// static C_block CF6464[64/CHUNKBITS][1<<CHUNKBITS];
+static C_block *CF6464;
+
+
+/* ==================================== */
+
+
+static C_block constdatablock; /* encryption constant */
+static char cryptresult[1+4+4+11+1]; /* encrypted result */
+
+/*
+ * Return a pointer to static data consisting of the "setting"
+ * followed by an encryption produced by the "key" and "setting".
+ */
+char *
+crypt(key, setting)
+ register const char *key;
+ register const char *setting;
+{
+ register char *encp;
+ register long i;
+ register int t;
+ long salt;
+ int num_iter, salt_size;
+ C_block keyblock, rsltblock;
+
+ for (i = 0; i < 8; i++) {
+ if ((t = 2*(unsigned char)(*key)) != 0)
+ key++;
+ keyblock.b[i] = t;
+ }
+ if (__crypt_des_setkey((char *)keyblock.b)) /* also initializes "a64toi" */
+ return (NULL);
+
+ encp = &cryptresult[0];
+ switch (*setting) {
+ case _PASSWORD_EFMT1:
+ /*
+ * Involve the rest of the password 8 characters at a time.
+ */
+ while (*key) {
+ if (__crypt_des_cipher((char *)&keyblock,
+ (char *)&keyblock, 0L, 1))
+ return (NULL);
+ for (i = 0; i < 8; i++) {
+ if ((t = 2*(unsigned char)(*key)) != 0)
+ key++;
+ keyblock.b[i] ^= t;
+ }
+ if (__crypt_des_setkey((char *)keyblock.b))
+ return (NULL);
+ }
+
+ *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;
+ if (__crypt_des_cipher((char *)&constdatablock, (char *)&rsltblock,
+ salt, num_iter))
+ return (NULL);
+
+ /*
+ * 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);
+}
+
+
+/*
+ * The Key Schedule, filled in by __crypt_des_setkey() or setkey().
+ */
+#define KS_SIZE 16
+static C_block KS[KS_SIZE];
+
+/*
+ * Set up the key schedule from the key.
+ */
+__private_extern__ int __crypt_des_setkey(key)
+ register const char *key;
+{
+ register DCL_BLOCK(K, K0, K1);
+ register C_block *ptabp;
+ register int i;
+ static int des_ready = 0;
+
+ if (!des_ready) {
+ init_des();
+ des_ready = 1;
+ }
+
+ PERM6464(K,K0,K1,(unsigned char *)key,PC1ROT);
+ key = (char *)&KS[0];
+ STORE(K&~0x03030303L, K0&~0x03030303L, K1, *(C_block *)key);
+ for (i = 1; i < 16; i++) {
+ key += sizeof(C_block);
+ STORE(K,K0,K1,*(C_block *)key);
+ ptabp = PC2ROT[Rotates[i]-1];
+ PERM6464(K,K0,K1,(unsigned char *)key,ptabp);
+ STORE(K&~0x03030303L, K0&~0x03030303L, K1, *(C_block *)key);
+ }
+ __crypt_des_setkey_called = 1;
+ return (0);
+}
+
+/*
+ * Encrypt (or decrypt if num_iter < 0) the 8 chars at "in" with abs(num_iter)
+ * iterations of DES, using the 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.
+ */
+__private_extern__ int __crypt_des_cipher(in, out, salt, num_iter)
+ const char *in;
+ char *out;
+ long salt;
+ int num_iter;
+{
+ /* variables that we want in registers, most important first */
+#if defined(pdp11)
+ register int j;
+#endif
+ register long L0, L1, R0, R1, k;
+ register C_block *kp;
+ register int loop_count;
+ ssize_t ks_inc;
+ 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); /* even bits */
+ PERM3264(R,R0,R1,B.b+4,IE3264); /* odd bits */
+
+ if (num_iter >= 0)
+ { /* encryption */
+ kp = &KS[0];
+ ks_inc = sizeof(*kp);
+ }
+ else
+ { /* decryption */
+ num_iter = -num_iter;
+ kp = &KS[KS_SIZE-1];
+ ks_inc = -sizeof(*kp);
+ }
+
+ while (--num_iter >= 0) {
+ loop_count = 8;
+ do {
+
+#define SPTAB(t, i) (*(long *)((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[i * 64],B.b[i]); y^=SPTAB(&SPE[(8 * 64) + (i * 64)],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[i * 64],j); y^=SPTAB(&SPE[(8 * 64) + (i * 64)],j);
+#else
+ /* use this if "k" is allocated to a register ... */
+#define DOXOR(x,y,i) k=B.b[i]; x^=SPTAB(&SPE[i * 64],k); y^=SPTAB(&SPE[(8 * 64) + (i * 64)],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 = (C_block *)((char *)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 = (C_block *)((char *)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);
+#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
+ return (0);
+}
+
+
+/*
+ * 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()
+{
+ register int i, j;
+ register long k;
+ register int tableno;
+ static unsigned char perm[64], tmp32[32]; /* "static" for speed */
+
+ /*
+ * table that converts chars "./0-9A-Za-z"to integers 0-63.
+ */
+ for (i = 0; i < 64; i++)
+ a64toi[itoa64[i]] = i;
+
+ /*
+ * 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] = k;
+ }
+#ifdef DEBUG
+ prtab("pc1tab", perm, 8);
+#endif
+ PC1ROT = (C_block *)calloc(sizeof(C_block), (64/CHUNKBITS) * (1<<CHUNKBITS));
+ for (i = 0; i < 2; i++)
+ PC2ROT[i] = (C_block *)calloc(sizeof(C_block), (64/CHUNKBITS) * (1<<CHUNKBITS));
+ 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] = k;
+ }
+ }
+#ifdef DEBUG
+ prtab("ietab", perm, 8);
+#endif
+ IE3264 = (C_block *)calloc(sizeof(C_block), (32/CHUNKBITS) * (1<<CHUNKBITS));
+ 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
+ CF6464 = (C_block *)calloc(sizeof(C_block), (64/CHUNKBITS) * (1<<CHUNKBITS));
+ SPE = (long *)calloc(sizeof(long), 2 * 8 * 64);
+ 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] = (k >> i) & 01;
+ k = 0;
+ for (i = 24; --i >= 0; )
+ k = (k<<1) | tmp32[perm[i]-1];
+ TO_SIX_BIT(SPE[(tableno * 64) + j], k);
+ k = 0;
+ for (i = 24; --i >= 0; )
+ k = (k<<1) | tmp32[perm[i+24]-1];
+ TO_SIX_BIT(SPE[(8 * 64) + (tableno * 64) + j], k);
+ }
+ }
+}
+
+/*
+ * 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(perm, p, chars_in, chars_out)
+ C_block *perm;
+ unsigned char p[64];
+ int chars_in, 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 * (1<<CHUNKBITS)) + j].b[k>>3] |= 1<<(k&07);
+ }
+ }
+}
+#endif /* BUILDING_VARIANT */
+
+/*
+ * "setkey" routine (for backwards compatibility)
+ */
+#if __DARWIN_UNIX03
+void setkey(key)
+#else /* !__DARWIN_UNIX03 */
+int setkey(key)
+#endif /* __DARWIN_UNIX03 */
+ register const char *key;
+{
+ 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;
+ }
+#if __DARWIN_UNIX03
+ __crypt_des_setkey((char *)keyblock.b);
+#else /* !__DARWIN_UNIX03 */
+ return (__crypt_des_setkey((char *)keyblock.b));
+#endif /* __DARWIN_UNIX03 */
+}
+
+/*
+ * "encrypt" routine (for backwards compatibility)
+ */
+#if __DARWIN_UNIX03
+void encrypt(block, flag)
+#else /* !__DARWIN_UNIX03 */
+int encrypt(block, flag)
+#endif /* __DARWIN_UNIX03 */
+ register char *block;
+ int flag;
+{
+ register int i, j, k;
+ C_block cblock;
+
+ /* Prevent encrypt from crashing if setkey was never called.
+ * This does not make a good cypher */
+ if (!__crypt_des_setkey_called) {
+ cblock.b32.i0 = cblock.b32.i1 = 0;
+ __crypt_des_setkey((char *)cblock.b);
+ }
+ for (i = 0; i < 8; i++) {
+ k = 0;
+ for (j = 0; j < 8; j++) {
+ k <<= 1;
+ k |= (unsigned char)*block++;
+ }
+ cblock.b[i] = k;
+ }
+ if (__crypt_des_cipher((char *)&cblock, (char *)&cblock, 0L, (flag ? -1: 1)))
+#if __DARWIN_UNIX03
+ return;
+#else /* !__DARWIN_UNIX03 */
+ return (1);
+#endif /* __DARWIN_UNIX03 */
+ for (i = 7; i >= 0; i--) {
+ k = cblock.b[i];
+ for (j = 7; j >= 0; j--) {
+ *--block = k&01;
+ k >>= 1;
+ }
+ }
+#if !__DARWIN_UNIX03
+ return (0);
+#endif /* !__DARWIN_UNIX03 */
+}
+
+#ifndef BUILDING_VARIANT
+#ifdef DEBUG
+STATIC
+prtab(s, t, num_rows)
+ char *s;
+ 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
+#endif /* BUILDING_VARIANT */