Replace the crypt implementation with one based on crypt(3) from minix,

fixing a licensing problem with the previous version.  Manuel did the
initial port, and I fixed it up to be reentrant.  I hope I didn't break
anything...
 -Erik

libcrypt/des.c

@@ -1,31 +1,48 @@
 /* vi: set sw=4 ts=4: */
 /*
- * Copyright (C) 2001 by Rene Müller
- *      DES based crypt() implementation, originally written for dietlibc by 
- *      Rene Müller, based on Bruce Schneier's Applied Cryptography, but 
- *      tightened up quite a bit.
+ * The one and only crypt(3) function.
  *
- * Copyright (C) 2001 by Erik Andersen 
- *      Adjusted each function to be reentrant, hacked in md5 support.
+ * This source code is derived from Minix's pwdauth.c, which was based
+ * on Andy Tanenbaum's book "Computer Networks", and then rewritten in
+ * C by Kees J. Bot, 7 Feb 1994.  This code was ported from Minix to
+ * uClibc on June 28, 2001 by Manuel Novoa III, and then reshuffled to
+ * be reentrant by Erik Andersen <andersen@lineo.com> on June 28, 2001. 
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Library General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
  *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
+ * for more details.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * You should have received a copy of the GNU Library General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Original copyright notice is retained at the end of this file.
  *
  */
 
 
 
+/* This program gets as input the key and salt arguments of the crypt(3)
+ * function as two null terminated strings.  The crypt result is output as
+ * one null terminated string.  Input and output must be <= 1024 characters.
+ * The exit code will be 1 on any error.
+ *
+ * If the key has the form '##name' then the key will be encrypted and the
+ * result checked to be equal to the encrypted password in the shadow password
+ * file.  If equal than '##name' will be returned, otherwise exit code 2.
+ *
+ * Otherwise the key will be encrypted normally and the result returned.
+ *
+ * As a special case, anything matches a null encrypted password to allow
+ * a no-password login.
+ */
+
 #include <crypt.h>
 #include <string.h>
 #include <unistd.h>
@@ -33,298 +50,319 @@
 extern char *md5_magic;
 extern char * md5_crypt_r( const char *pw, const char *salt, struct crypt_data * data);
 
-/* Initial permutation, */
-static const char IP[] = {
-  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,
-  56,48,40,32,24,16, 8, 0,
-  58,50,42,34,26,18,10, 2,
-  60,52,44,36,28,20,12, 4,
-  62,54,46,38,30,22,14, 6
-};
+//struct block {
+//	unsigned char b_data[64];
+//};
 
-/* Final permutation, FP = IP^(-1) */
-static const char FP[] = {
-  39, 7,47,15,55,23,63,31,
-  38, 6,46,14,54,22,62,30,
-  37, 5,45,13,53,21,61,29,
-  36, 4,44,12,52,20,60,28,
-  35, 3,43,11,51,19,59,27,
-  34, 2,42,10,50,18,58,26,
-  33, 1,41, 9,49,17,57,25,
-  32, 0,40, 8,48,16,56,24
+struct ordering {
+	unsigned char o_data[64];
 };
 
-/* Permuted-choice 1 from the key bits to yield C and D.
- * Note that bits 8,16... are left out: They are intended for a parity check.
- */
-static const char PC1_C[] = {
-  56,48,40,32,24,16, 8,
-   0,57,49,41,33,25,17,
-   9, 1,58,50,42,34,26,
-  18,10, 2,59,51,43,35
+static const struct ordering InitialTr = { {
+	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,
+} };
+
+static const struct ordering FinalTr = { {
+	40, 8,48,16,56,24,64,32,39, 7,47,15,55,23,63,31,
+	38, 6,46,14,54,22,62,30,37, 5,45,13,53,21,61,29,
+	36, 4,44,12,52,20,60,28,35, 3,43,11,51,19,59,27,
+	34, 2,42,10,50,18,58,26,33, 1,41, 9,49,17,57,25,
+} };
+
+static const struct ordering swap = { {
+	33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
+	49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,
+	 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,
+	17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,
+} };
+
+static const struct ordering KeyTr1 = { {
+	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 struct ordering KeyTr2 = { {
+	14,17,11,24, 1, 5, 3,28,15, 6,21,10,
+	23,19,12, 4,26, 8,16, 7,27,20,13, 2,
+	41,52,31,37,47,55,30,40,51,45,33,48,
+	44,49,39,56,34,53,46,42,50,36,29,32,
+} };
+
+static const struct ordering etr = { {
+	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 struct ordering ptr = { {
+	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 s_boxes[8][64] = {
+{	14, 4,13, 1, 2,15,11, 8, 3,10, 6,12, 5, 9, 0, 7,
+	 0,15, 7, 4,14, 2,13, 1,10, 6,12,11, 9, 5, 3, 8,
+	 4, 1,14, 8,13, 6, 2,11,15,12, 9, 7, 3,10, 5, 0,
+	15,12, 8, 2, 4, 9, 1, 7, 5,11, 3,14,10, 0, 6,13,
+},
+
+{	15, 1, 8,14, 6,11, 3, 4, 9, 7, 2,13,12, 0, 5,10,
+	 3,13, 4, 7,15, 2, 8,14,12, 0, 1,10, 6, 9,11, 5,
+	 0,14, 7,11,10, 4,13, 1, 5, 8,12, 6, 9, 3, 2,15,
+	13, 8,10, 1, 3,15, 4, 2,11, 6, 7,12, 0, 5,14, 9,
+},
+
+{	10, 0, 9,14, 6, 3,15, 5, 1,13,12, 7,11, 4, 2, 8,
+	13, 7, 0, 9, 3, 4, 6,10, 2, 8, 5,14,12,11,15, 1,
+	13, 6, 4, 9, 8,15, 3, 0,11, 1, 2,12, 5,10,14, 7,
+	 1,10,13, 0, 6, 9, 8, 7, 4,15,14, 3,11, 5, 2,12,
+},
+
+{	 7,13,14, 3, 0, 6, 9,10, 1, 2, 8, 5,11,12, 4,15,
+	13, 8,11, 5, 6,15, 0, 3, 4, 7, 2,12, 1,10,14, 9,
+	10, 6, 9, 0,12,11, 7,13,15, 1, 3,14, 5, 2, 8, 4,
+	 3,15, 0, 6,10, 1,13, 8, 9, 4, 5,11,12, 7, 2,14,
+},
+
+{	 2,12, 4, 1, 7,10,11, 6, 8, 5, 3,15,13, 0,14, 9,
+	14,11, 2,12, 4, 7,13, 1, 5, 0,15,10, 3, 9, 8, 6,
+	 4, 2, 1,11,10,13, 7, 8,15, 9,12, 5, 6, 3, 0,14,
+	11, 8,12, 7, 1,14, 2,13, 6,15, 0, 9,10, 4, 5, 3,
+},
+
+{	12, 1,10,15, 9, 2, 6, 8, 0,13, 3, 4,14, 7, 5,11,
+	10,15, 4, 2, 7,12, 9, 5, 6, 1,13,14, 0,11, 3, 8,
+	 9,14,15, 5, 2, 8,12, 3, 7, 0, 4,10, 1,13,11, 6,
+	 4, 3, 2,12, 9, 5,15,10,11,14, 1, 7, 6, 0, 8,13,
+},
+
+{	 4,11, 2,14,15, 0, 8,13, 3,12, 9, 7, 5,10, 6, 1,
+	13, 0,11, 7, 4, 9, 1,10,14, 3, 5,12, 2,15, 8, 6,
+	 1, 4,11,13,12, 3, 7,14,10,15, 6, 8, 0, 5, 9, 2,
+	 6,11,13, 8, 1, 4,10, 7, 9, 5, 0,15,14, 2, 3,12,
+},
+
+{	13, 2, 8, 4, 6,15,11, 1,10, 9, 3,14, 5, 0,12, 7,
+	 1,15,13, 8,10, 3, 7, 4,12, 5, 6,11, 0,14, 9, 2,
+	 7,11, 4, 1, 9,12,14, 2, 0, 6,10,13,15, 3, 5, 8,
+	 2, 1,14, 7, 4,10, 8,13,15,12, 9, 0, 3, 5, 6,11,
+},
 };
 
-static const char PC1_D[] = {
-  62,54,46,38,30,22,14,
-   6,61,53,45,37,29,21,
-  13, 5,60,52,44,36,28,
-  20,12, 4,27,19,11, 3
+static const int rots[] = {
+	1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1,
 };
 
-/* Sequence of shifts used for the key schedule. */
-static const char shifts[] = { 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1 };
+static void transpose(struct block *data, const struct ordering *t, int n)
+{
+	struct block x;
 
-/*
- * Permuted-choice 2, to pick out the bits from the CD array that generate
- * the key schedule.
- */
-static const char PC2_C[] = {
-  13, 16, 10, 23,  0,  4,  2, 27, 14,  5, 20,  9,
-  22, 18, 11,  3, 25,  7, 15,  6, 26, 19, 12,  1
-};
+	x = *data;
 
-static const char PC2_D[] = {
-  12, 23,  2,  8, 18, 26,  1, 11, 22, 16,  4, 19,
-  15, 20, 10, 27,  5, 24, 17, 13, 21,  7,  0,  3
-};
+	while (n-- > 0) {
+		data->b_data[n] = x.b_data[t->o_data[n] - 1];
+	}
+}
 
-static const char e2[] = {
-  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 void rotate(struct block *key)
+{
+	unsigned char *p = key->b_data;
+	unsigned char *ep = &(key->b_data[55]);
+	int data0 = key->b_data[0], data28 = key->b_data[28];
 
-/* The 8 selection functions. For some reason, they give a 0-origin index,
- * unlike everything else.
- */
-static const char S[8][64] = {
-  {
-    14, 4,13, 1, 2,15,11, 8, 3,10, 6,12, 5, 9, 0, 7,
-     0,15, 7, 4,14, 2,13, 1,10, 6,12,11, 9, 5, 3, 8,
-     4, 1,14, 8,13, 6, 2,11,15,12, 9, 7, 3,10, 5, 0,
-    15,12, 8, 2, 4, 9, 1, 7, 5,11, 3,14,10, 0, 6,13
-  },
-
-  {
-    15, 1, 8,14, 6,11, 3, 4, 9, 7, 2,13,12, 0, 5,10,
-     3,13, 4, 7,15, 2, 8,14,12, 0, 1,10, 6, 9,11, 5,
-     0,14, 7,11,10, 4,13, 1, 5, 8,12, 6, 9, 3, 2,15,
-    13, 8,10, 1, 3,15, 4, 2,11, 6, 7,12, 0, 5,14, 9
-  },
-
-  {
-    10, 0, 9,14, 6, 3,15, 5, 1,13,12, 7,11, 4, 2, 8,
-    13, 7, 0, 9, 3, 4, 6,10, 2, 8, 5,14,12,11,15, 1,
-    13, 6, 4, 9, 8,15, 3, 0,11, 1, 2,12, 5,10,14, 7,
-     1,10,13, 0, 6, 9, 8, 7, 4,15,14, 3,11, 5, 2,12
-  },
-
-  {
-     7,13,14, 3, 0, 6, 9,10, 1, 2, 8, 5,11,12, 4,15,
-    13, 8,11, 5, 6,15, 0, 3, 4, 7, 2,12, 1,10,14, 9,
-    10, 6, 9, 0,12,11, 7,13,15, 1, 3,14, 5, 2, 8, 4,
-     3,15, 0, 6,10, 1,13, 8, 9, 4, 5,11,12, 7, 2,14
-  },
-
-  {
-     2,12, 4, 1, 7,10,11, 6, 8, 5, 3,15,13, 0,14, 9,
-    14,11, 2,12, 4, 7,13, 1, 5, 0,15,10, 3, 9, 8, 6,
-     4, 2, 1,11,10,13, 7, 8,15, 9,12, 5, 6, 3, 0,14,
-    11, 8,12, 7, 1,14, 2,13, 6,15, 0, 9,10, 4, 5, 3
-  },
-
-  {
-    12, 1,10,15, 9, 2, 6, 8, 0,13, 3, 4,14, 7, 5,11,
-    10,15, 4, 2, 7,12, 9, 5, 6, 1,13,14, 0,11, 3, 8,
-     9,14,15, 5, 2, 8,12, 3, 7, 0, 4,10, 1,13,11, 6,
-     4, 3, 2,12, 9, 5,15,10,11,14, 1, 7, 6, 0, 8,13
-  },
-
-  {
-     4,11, 2,14,15, 0, 8,13, 3,12, 9, 7, 5,10, 6, 1,
-    13, 0,11, 7, 4, 9, 1,10,14, 3, 5,12, 2,15, 8, 6,
-     1, 4,11,13,12, 3, 7,14,10,15, 6, 8, 0, 5, 9, 2,
-     6,11,13, 8, 1, 4,10, 7, 9, 5, 0,15,14, 2, 3,12
-  },
-
-  {
-    13, 2, 8, 4, 6,15,11, 1,10, 9, 3,14, 5, 0,12, 7,
-     1,15,13, 8,10, 3, 7, 4,12, 5, 6,11, 0,14, 9, 2,
-     7,11, 4, 1, 9,12,14, 2, 0, 6,10,13,15, 3, 5, 8,
-     2, 1,14, 7, 4,10, 8,13,15,12, 9, 0, 3, 5, 6,11
-  }
-};
+	while (p++ < ep) *(p-1) = *p;
+	key->b_data[27] = data0;
+	key->b_data[55] = data28;
+}
 
-/* P is a permutation on the selected combination of the current L and key. */
-static const char P[] = {
-  15, 6,19,20, 28,11,27,16,  0,14,22,25,  4,17,30, 9,
-   1, 7,23,13, 31,26, 2, 8, 18,12,29, 5, 21,10, 3,24
-};
+static const struct ordering *EP = &etr;
 
-/* Set up the key schedule from the key. */
-void setkey_r(const char *key, struct crypt_data *data)
+static void f(int i, struct block *key, struct block *a, struct block *x)
 {
-  register int i, j, k;
-  int  t;
-  int  s;
-
-  /* First, generate C and D by permuting the key.  The low order bit of each
-   * 8-bit char is not used, so C and D are only 28 bits apiece.
-   */
-  for(i=0; i < 28; i++) {
-    data->C[i] = key[(int)PC1_C[i]];
-    data->D[i] = key[(int)PC1_D[i]];
-  }
-  /* To generate Ki, rotate C and D according to schedule and pick up a
-   * permutation using PC2.
-   */
-  for(i=0; i < 16; i++) {
-    /* rotate. */
-    s = shifts[i];
-    for(k=0; k < s; k++) {
-      t = data->C[0];
-      for(j=0; j < 27; j++)
-	data->C[j] = data->C[j+1];
-      data->C[27] = t;
-      t = data->D[0];
-      for(j=0; j < 27; j++)
-	data->D[j] = data->D[j+1];
-      data->D[27] = t;
-    }
-    /* get Ki. Note C and D are concatenated. */
-    for(j=0; j < 24; j++) {
-      data->KS[i][j] = data->C[(int)PC2_C[j]];
-      data->KS[i][j+24] = data->D[(int)PC2_D[j]];
-    }
-  }
-
-  for(i=0; i < 48; i++)
-    data->E[i] = e2[i];
+	struct block e, ikey, y;
+	int k;
+	unsigned char *p, *q, *r;
+
+	e = *a;
+	transpose(&e, EP, 48);
+	for (k = rots[i]; k; k--) rotate(key);
+	ikey = *key;
+	transpose(&ikey, &KeyTr2, 48);
+	p = &(y.b_data[48]);
+	q = &(e.b_data[48]);
+	r = &(ikey.b_data[48]);
+	while (p > y.b_data) {
+		*--p = *--q ^ *--r;
+	}
+	q = x->b_data;
+	for (k = 0; k < 8; k++) {
+		int xb, r;
+
+		r = *p++ << 5;
+		r += *p++ << 3;
+		r += *p++ << 2;
+		r += *p++ << 1;
+		r += *p++;
+		r += *p++ << 4;
+
+		xb = s_boxes[k][r];
+
+		*q++ = (xb >> 3) & 1;
+		*q++ = (xb>>2) & 1;
+		*q++ = (xb>>1) & 1;
+		*q++ = (xb & 1);
+	}
+	transpose(x, &ptr, 32);
 }
 
+void setkey_r(const char *k, struct crypt_data *data)
+{
+	struct block *key = &(data->key);
+	memcpy(key, k, (sizeof(struct block)));
+	transpose(key, &KeyTr1, 56);
+}
 
-/* The payoff: encrypt a block. */
-void encrypt_r(char block[64], int edflag, struct crypt_data *data)
+extern void encrypt_r(char *blck, int edflag, struct crypt_data *data)
 {
-  int  i, ii;
-  register int t, j, k;
-
-  /* First, permute the bits in the input */
-  for(j=0; j < 64; j++)
-    data->L[j] = data->block[(int)IP[j]];
-  /* Perform an encryption operation 16 times. */
-  for(ii=0; ii < 16; ii++) {
-    i = ii;
-    /* Save the R array, which will be the new L. */
-    for(j=0; j < 32; j++)
-      data->tempL[j] = data->R[j];
-    /* Expand R to 48 bits using the E selector;
-     * exclusive-or with the current key bits.
-     */
-    for(j=0; j < 48; j++)
-      data->preS[j] = data->R[data->E[j]-1] ^ data->KS[i][j];
-    /* The pre-select bits are now considered in 8 groups of 6 bits each.
-     * The 8 selection functions map these 6-bit quantities into 4-bit
-     * quantities and the results permuted to make an f(R, K).
-     * The indexing into the selection functions is peculiar;
-     * it could be simplified by rewriting the tables.
-     */
-    for(j=0; j < 8; j++) {
-      t = ((j<<1)+j)<<1;
-      k = S[j][(data->preS[t]<<5)+
-	 (data->preS[t+1]<<3)+
-	 (data->preS[t+2]<<2)+
-	 (data->preS[t+3]<<1)+
-	 (data->preS[t+4]   )+
-	 (data->preS[t+5]<<4)];
-      t = j << 2;
-      data->f[t  ] = (k>>3)&01;
-      data->f[t+1] = (k>>2)&01;
-      data->f[t+2] = (k>>1)&01;
-      data->f[t+3] = (k   )&01;
-    }
-    /* The new R is L ^ f(R, K). The f here has to be permuted first, though. */
-    for(j=0; j < 32; j++)
-      data->R[j] = data->L[j] ^ data->f[(int)P[j]];
-    /* Finally, the new L (the original R) is copied back. */
-    for(j=0; j < 32; j++)
-      data->L[j] = data->tempL[j];
-  }
-  /* The output L and R are reversed. */
-  for(j=0; j < 32; j++) {
-    data->L[j] ^= data->R[j];
-    data->R[j] ^= data->L[j];
-    data->L[j] ^= data->R[j];
-  }
-  /* The final output gets the inverse permutation of the very original. */
-  for(j=0; j < 64; j++)
-    data->block[j] = data->L[(int)FP[j]];
+	struct block *key = &(data->key);
+	struct block *p = (struct block *) blck;
+	int i;
+
+	transpose(p, &InitialTr, 64);
+	for (i = 15; i>= 0; i--) {
+		int j = edflag ? i : 15 - i;
+		int k;
+		struct block b, x;
+
+		b = *p;
+		for (k = 31; k >= 0; k--) {
+			p->b_data[k] = b.b_data[k + 32];
+		}
+		f(j, key, p, &x);
+		for (k = 31; k >= 0; k--) {
+			p->b_data[k+32] = b.b_data[k] ^ x.b_data[k];
+		}
+	}
+	transpose(p, &swap, 64);
+	transpose(p, &FinalTr, 64);
 }
 
-char * crypt_r(const char *pw, const char *salt, struct crypt_data *data)
+extern char *crypt_r(const char *pw, const char *salt, struct crypt_data *data)
 {
-  register int i, j, c;
-  
-  
-  /* Check if we are supposed to be using the MD5 encryption replacement.  */
-  if (strncmp (md5_magic, salt, sizeof (md5_magic) - 1) == 0)
-    return md5_crypt_r(pw, salt, data);
-
-  for(i=0; i < 66; i++)
-    data->block[i] = 0;
-  for(i=0; (c= *pw) && i < 64; pw++) {
-    for(j=0; j < 7; j++, i++)
-      data->block[i] = (c>>(6-j)) & 01;
-    i++;
-  }
-
-  setkey_r(data->block, data);
-
-  for(i=0; i < 66; i++)
-    data->block[i] = 0;
-
-  for(i=0; i < 2; i++) {
-    c = *salt++;
-    data->iobuf[i] = c;
-    if(c > 'Z')
-      c -= 6;
-    if(c > '9')
-      c -= 7;
-    c -= '.';
-    for(j=0; j < 6; j++) {
-      if((c>>j) & 01) {
-	int ind1 = (((i<<1)+i)<< 1) + j;
-	int ind2 = ind1 + 24;
-	data->E[ind1] ^= data->E[ind2];
-	data->E[ind2] ^= data->E[ind1];
-	data->E[ind1] ^= data->E[ind2];
-      }
-    }
-  }
-
-  for(i=0; i < 25; i++)
-    encrypt_r(data->block, 0, data);
-
-  for(i=0; i < 11; i++) {
-    c = 0;
-    for(j=0; j < 6; j++) {
-      c <<= 1;
-      c |= data->block[(((i<<1)+i)<<1)+j];
-    }
-    c += '.';
-    if(c > '9')
-      c += 7;
-    if(c > 'Z')
-      c += 6;
-    data->iobuf[i+2] = c;
-  }
-  data->iobuf[i+2] = 0;
-  if(data->iobuf[1] == 0)
-    data->iobuf[1] = data->iobuf[0];
-  return(data->iobuf);
+	char pwb[66];
+	char *cp;
+	static char result[16];
+	char *p = pwb;
+	struct ordering new_etr;
+	int i;
+
+	/* First, check if we are supposed to be using the MD5 replacement
+	 * instead of DES...  */
+	if (strncmp (md5_magic, salt, sizeof (md5_magic) - 1) == 0)
+		return md5_crypt_r(pw, salt, data);
+
+	while (*pw && p < &pwb[64]) {
+		int j = 7;
+
+		while (j--) {
+			*p++ = (*pw >> j) & 01;
+		}
+		pw++;
+		*p++ = 0;
+	}
+	while (p < &pwb[64]) *p++ = 0;
+
+	setkey_r(p = pwb, data);
+
+	while (p < &pwb[66]) *p++ = 0;
+
+	new_etr = etr;
+	EP = &new_etr;
+	if (salt[0] == 0 || salt[1] == 0) salt = "**";
+	for (i = 0; i < 2; i++) {
+		char c = *salt++;
+		int j;
+
+		result[i] = c;
+		if ( c > 'Z') c -= 6 + 7 + '.';	/* c was a lower case letter */
+		else if ( c > '9') c -= 7 + '.';/* c was upper case letter */
+		else c -= '.';			/* c was digit, '.' or '/'. */
+						/* now, 0 <= c <= 63 */
+		for (j = 0; j < 6; j++) {
+			if ((c >> j) & 01) {
+				int t = 6*i + j;
+				int temp = new_etr.o_data[t];
+				new_etr.o_data[t] = new_etr.o_data[t+24];
+				new_etr.o_data[t+24] = temp;
+			}
+		}
+	}
+
+	if (result[1] == 0) result[1] = result[0];
+
+	for (i = 0; i < 25; i++) encrypt(pwb,0);
+	EP = &etr;
+
+	p = pwb;
+	cp = result+2;
+	while (p < &pwb[66]) {
+		int c = 0;
+		int j = 6;
+
+		while (j--) {
+			c <<= 1;
+			c |= *p++;
+		}
+		c += '.';		/* becomes >= '.' */
+		if (c > '9') c += 7;	/* not in [./0-9], becomes upper */
+		if (c > 'Z') c += 6;	/* not in [A-Z], becomes lower */
+		*cp++ = c;
+	}
+	*cp = 0;
+	return result;
 }
 
+
+/*
+ * Copyright (c) 1987,1997, Prentice Hall
+ * All rights reserved.
+ * 
+ * Redistribution and use of the MINIX operating system in source and
+ * binary forms, with or without modification, are permitted provided
+ * that the following conditions are met:
+ * 
+ * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 
+ * 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.
+ * 
+ * Neither the name of Prentice Hall nor the names of the software
+ * authors or contributors may be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, 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 PRENTICE HALL OR ANY AUTHORS 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.
+ *
+ */
+
+