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+/*
+ * 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. 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)crypt.c 8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+
+#include "ruby/missing.h"
+#include "crypt.h"
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <limits.h>
+#ifdef HAVE_PWD_H
+#include <pwd.h>
+#endif
+#include <stdio.h>
+#include <string.h>
+#ifndef _PASSWORD_EFMT1
+#define _PASSWORD_EFMT1 '_'
+#endif
+
+/*
+ * 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 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
+
+/*
+ * 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] = (unsigned char)(src); (src) >>= 6; \
+ cvt.b[1] = (unsigned char)(src); (src) >>= 6; \
+ cvt.b[2] = (unsigned char)(src); (src) >>= 6; \
+ cvt.b[3] = (unsigned char)(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 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 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); }
+
+STATIC void
+permute(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 /* LARGEDATA */
+
+#ifdef DEBUG
+STATIC void prtab(const char *s, const unsigned char *t, int num_rows);
+#endif
+
+/* ===== (mostly) Standard DES Tables ==================== */
+
+static const 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 const 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 const 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 const 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 const 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 const 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 const 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 const unsigned char itoa64[] = /* 0..63 => ascii-64 */
+ "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+
+#define a64toi (data->a64toi)
+#define PC1ROT (data->PC1ROT)
+#define PC2ROT (data->PC2ROT)
+#define IE3264 (data->IE3264)
+#define SPE (data->SPE)
+#define CF6464 (data->CF6464)
+#define KS (data->KS)
+#define constdatablock (data->constdatablock)
+#define cryptresult (data->cryptresult)
+#define des_ready (data->initialized)
+
+STATIC void init_des(struct crypt_data *);
+STATIC void init_perm(C_block perm[64/CHUNKBITS][1<<CHUNKBITS], unsigned char p[64], int chars_in, int chars_out);
+
+static struct crypt_data default_crypt_data;
+
+/*
+ * Return a pointer to static data consisting of the "setting"
+ * followed by an encryption produced by the "key" and "setting".
+ */
+char *
+crypt(const char *key, const char *setting)
+{
+ return crypt_r(key, setting, &default_crypt_data);
+}
+
+/*
+ * Return a pointer to data consisting of the "setting" followed by an
+ * encryption produced by the "key" and "setting".
+ */
+char *
+crypt_r(const char *key, const char *setting, struct crypt_data *data)
+{
+ 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;
+ }
+ des_setkey_r((char *)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((char *)&keyblock,
+ (char *)&keyblock, 0L, 1, data);
+ for (i = 0; i < 8; i++) {
+ if ((t = 2*(unsigned char)(*key)) != 0)
+ key++;
+ keyblock.b[i] ^= t;
+ }
+ des_setkey_r((char *)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((char *)&constdatablock, (char *)&rsltblock,
+ 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.
+ */
+void
+des_setkey(const char *key)
+{
+ des_setkey_r(key, &default_crypt_data);
+}
+
+void
+des_setkey_r(const char *key, struct crypt_data *data)
+{
+ register DCL_BLOCK(K, K0, K1);
+ register C_block *ptabp;
+ register int i;
+
+ if (!des_ready) {
+ memset(data, 0, sizeof(*data));
+ init_des(data);
+ des_ready = 1;
+ }
+
+ PERM6464(K,K0,K1,(unsigned char *)key,(C_block *)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 = (C_block *)PC2ROT[Rotates[i]-1];
+ PERM6464(K,K0,K1,(unsigned char *)key,ptabp);
+ STORE(K&~0x03030303L, K0&~0x03030303L, K1, *(C_block *)key);
+ }
+}
+
+/*
+ * 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(const char *in, char *out, long salt, int num_iter)
+{
+ des_cipher_r(in, out, salt, num_iter, &default_crypt_data);
+}
+
+void
+des_cipher_r(const char *in, 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 long L0, L1, R0, R1, k;
+ register 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, (C_block *)IE3264); /* even bits */
+ PERM3264(R,R0,R1,B.b+4,(C_block *)IE3264); /* odd bits */
+
+ if (num_iter >= 0)
+ { /* encryption */
+ kp = &KS[0];
+ ks_inc = (int)sizeof(*kp);
+ }
+ else
+ { /* decryption */
+ num_iter = -num_iter;
+ kp = &KS[KS_SIZE-1];
+ ks_inc = -(int)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[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 = (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, (C_block *)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
+}
+
+
+/*
+ * 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(struct crypt_data *data)
+{
+ register int i, j;
+ register long k;
+ register int tableno;
+ unsigned char perm[64], tmp32[32];
+
+ /*
+ * 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] = (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);
+ }
+ }
+}
+
+/*
+ * 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);
+ }
+ }
+}
+
+/*
+ * "setkey" routine (for backwards compatibility)
+ */
+void
+setkey(const char *key)
+{
+ setkey_r(key, &default_crypt_data);
+}
+
+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((char *)keyblock.b, data);
+}
+
+/*
+ * "encrypt" routine (for backwards compatibility)
+ */
+void
+encrypt(char *block, int flag)
+{
+ encrypt_r(block, flag, &default_crypt_data);
+}
+
+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((char *)&cblock, (char *)&cblock, 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