uclibc insists on having 70k static buffer for crypt.

For bbox it's not acceptable. Roll our own des and md5 crypt
implementation. Against older uclibc:

   text    data     bss     dec     hex filename
 759945     604    6684  767233   bb501 busybox_old
 759766     604    6684  767054   bb44e busybox_unstripped

so, we still save on code size.

10 files changed, 1456 insertions, 24 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 97aae0bb4..bd2dbe573 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1032,18 +1032,8 @@ extern int restricted_shell(const char *shell);
 extern void setup_environment(const char *shell, int clear_env, int change_env, const struct passwd *pw);
 extern int correct_password(const struct passwd *pw);
 /* Returns a ptr to static storage */
-extern char *pw_encrypt(const char *clear, const char *salt);
+extern char *pw_encrypt(const char *clear, const char *salt, int cleanup);
 extern int obscure(const char *old, const char *newval, const struct passwd *pwdp);
-
-int index_in_str_array(const char *const string_array[], const char *key);
-int index_in_strings(const char *strings, const char *key);
-int index_in_substr_array(const char *const string_array[], const char *key);
-int index_in_substrings(const char *strings, const char *key);
-const char *nth_string(const char *strings, int n);
-
-extern void print_login_issue(const char *issue_file, const char *tty);
-extern void print_login_prompt(void);
-
 /* rnd is additional random input. New one is returned.
  * Useful if you call crypt_make_salt many times in a row:
  * rnd = crypt_make_salt(buf1, 4, 0);
@@ -1052,11 +1042,19 @@ extern void print_login_prompt(void);
  * (otherwise we risk having same salt generated)
  */
 extern int crypt_make_salt(char *p, int cnt, int rnd);
-
 /* Returns number of lines changed, or -1 on error */
 extern int update_passwd(const char *filename, const char *username,
                         const char *new_pw);
 
+int index_in_str_array(const char *const string_array[], const char *key);
+int index_in_strings(const char *strings, const char *key);
+int index_in_substr_array(const char *const string_array[], const char *key);
+int index_in_substrings(const char *strings, const char *key);
+const char *nth_string(const char *strings, int n);
+
+extern void print_login_issue(const char *issue_file, const char *tty);
+extern void print_login_prompt(void);
+
 /* NB: typically you want to pass fd 0, not 1. Think 'applet | grep something' */
 int get_terminal_width_height(int fd, unsigned *width, unsigned *height);
 
diff --git a/libbb/correct_password.c b/libbb/correct_password.c
index 96bb10e0b..a4ded8b5f 100644
--- a/libbb/correct_password.c
+++ b/libbb/correct_password.c
@@ -71,7 +71,7 @@ int correct_password(const struct passwd *pw)
         if (!unencrypted) {
                 return 0;
         }
-        encrypted = crypt(unencrypted, correct);
+        encrypted = pw_encrypt(unencrypted, correct, 1);
         memset(unencrypted, 0, strlen(unencrypted));
         return strcmp(encrypted, correct) == 0;
 }
diff --git a/libbb/pw_encrypt.c b/libbb/pw_encrypt.c
index e9cf4e3b8..d439fc3b4 100644
--- a/libbb/pw_encrypt.c
+++ b/libbb/pw_encrypt.c
@@ -8,11 +8,52 @@
  */
 
 #include "libbb.h"
-#include <crypt.h>
 
-char *pw_encrypt(const char *clear, const char *salt)
+/*
+ * DES and MD5 crypt implementations are taken from uclibc.
+ * They were modified to not use static buffers.
+ * Comparison with uclibc (before uclibc had 70k staic buffers reinstated):
+ *   text    data     bss     dec     hex filename
+ * 759909     604    6684  767197   bb4dd busybox_old
+ * 759579     604    6684  766867   bb393 busybox_unstripped
+ */
+/* Common for them */
+static const uint8_t ascii64[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+#include "pw_encrypt_des.c"
+#include "pw_encrypt_md5.c"
+
+
+static struct const_des_ctx *des_cctx;
+static struct des_ctx *des_ctx;
+
+/* my_crypt returns malloc'ed data */
+static char *my_crypt(const char *key, const char *salt)
+{
+        /* First, check if we are supposed to be using the MD5 replacement
+         * instead of DES...  */
+        if (salt[0] == '$' && salt[1] == '1' && salt[2] == '$') {
+                return md5_crypt(xzalloc(MD5_OUT_BUFSIZE), (unsigned char*)key, (unsigned char*)salt);
+        }
+
+        {
+                if (!des_cctx)
+                        des_cctx = const_des_init();
+                des_ctx = des_init(des_ctx, des_cctx);
+                return des_crypt(des_ctx, xzalloc(DES_OUT_BUFSIZE), (unsigned char*)key, (unsigned char*)salt);
+        }
+}
+
+/* So far nobody wants to have it public */
+static void my_crypt_cleanup(void)
+{
+        free(des_cctx);
+        free(des_ctx);
+        des_cctx = NULL;
+        des_ctx = NULL;
+}
+
+char *pw_encrypt(const char *clear, const char *salt, int cleanup)
 {
-        /* Was static char[BIGNUM]. Malloced thing works as well */
         static char *cipher;
 
 #if 0 /* was CONFIG_FEATURE_SHA1_PASSWORDS, but there is no such thing??? */
@@ -22,6 +63,10 @@ char *pw_encrypt(const char *clear, const char *salt)
 #endif
 
         free(cipher);
-        cipher = xstrdup(crypt(clear, salt));
+        cipher = my_crypt(clear, salt);
+
+        if (cleanup)
+                my_crypt_cleanup();
+
         return cipher;
 }
diff --git a/libbb/pw_encrypt_des.c b/libbb/pw_encrypt_des.c
new file mode 100644
index 000000000..637765ead
--- /dev/null
+++ b/libbb/pw_encrypt_des.c
@@ -0,0 +1,703 @@
+/*
+ * FreeSec: libcrypt for NetBSD
+ *
+ * Copyright (c) 1994 David Burren
+ * All rights reserved.
+ *
+ * Adapted for FreeBSD-2.0 by Geoffrey M. Rehmet
+ *      this file should now *only* export crypt(), in order to make
+ *      binaries of libcrypt exportable from the USA
+ *
+ * Adapted for FreeBSD-4.0 by Mark R V Murray
+ *      this file should now *only* export crypt_des(), in order to make
+ *      a module that can be optionally included in libcrypt.
+ *
+ * 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 author nor the names of other contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * This is an original implementation of the DES and the crypt(3) interfaces
+ * by David Burren <davidb@werj.com.au>.
+ *
+ * An excellent reference on the underlying algorithm (and related
+ * algorithms) is:
+ *
+ *      B. Schneier, Applied Cryptography: protocols, algorithms,
+ *      and source code in C, John Wiley & Sons, 1994.
+ *
+ * Note that in that book's description of DES the lookups for the initial,
+ * pbox, and final permutations are inverted (this has been brought to the
+ * attention of the author).  A list of errata for this book has been
+ * posted to the sci.crypt newsgroup by the author and is available for FTP.
+ *
+ * ARCHITECTURE ASSUMPTIONS:
+ *      It is assumed that the 8-byte arrays passed by reference can be
+ *      addressed as arrays of uint32_t's (ie. the CPU is not picky about
+ *      alignment).
+ */
+
+/* A pile of data */
+static const uint8_t IP[64] = {
+        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 uint8_t key_perm[56] = {
+        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 uint8_t key_shifts[16] = {
+        1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
+};
+
+static const uint8_t comp_perm[48] = {
+        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
+};
+
+/*
+ * No E box is used, as it's replaced by some ANDs, shifts, and ORs.
+ */
+
+static const uint8_t sbox[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 uint8_t pbox[32] = {
+        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 uint32_t bits32[32] =
+{
+        0x80000000, 0x40000000, 0x20000000, 0x10000000,
+        0x08000000, 0x04000000, 0x02000000, 0x01000000,
+        0x00800000, 0x00400000, 0x00200000, 0x00100000,
+        0x00080000, 0x00040000, 0x00020000, 0x00010000,
+        0x00008000, 0x00004000, 0x00002000, 0x00001000,
+        0x00000800, 0x00000400, 0x00000200, 0x00000100,
+        0x00000080, 0x00000040, 0x00000020, 0x00000010,
+        0x00000008, 0x00000004, 0x00000002, 0x00000001
+};
+
+static const uint8_t bits8[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
+
+
+static int 
+ascii_to_bin(char ch)
+{
+        if (ch > 'z')
+                return 0;
+        if (ch >= 'a')
+                return (ch - 'a' + 38);
+        if (ch > 'Z')
+                return 0;
+        if (ch >= 'A')
+                return (ch - 'A' + 12);
+        if (ch > '9')
+                return 0;
+        if (ch >= '.')
+                return (ch - '.');
+        return 0;
+}
+
+
+/* Static stuff that stays resident and doesn't change after 
+ * being initialized, and therefore doesn't need to be made 
+ * reentrant. */
+struct const_des_ctx {
+        uint8_t init_perm[64], final_perm[64]; /* referenced 2 times each */
+        uint8_t m_sbox[4][4096]; /* 5 times */
+};
+#define C (*cctx)
+#define init_perm  (C.init_perm )
+#define final_perm (C.final_perm)
+#define m_sbox     (C.m_sbox    )
+
+static struct const_des_ctx*
+const_des_init(void)
+{
+        int i, j, b;
+        uint8_t u_sbox[8][64];
+        struct const_des_ctx *cctx;
+
+        cctx = xmalloc(sizeof(*cctx));
+
+        /*
+         * Invert the S-boxes, reordering the input bits.
+         */
+        for (i = 0; i < 8; i++) {
+                for (j = 0; j < 64; j++) {
+                        b = (j & 0x20) | ((j & 1) << 4) | ((j >> 1) & 0xf);
+                        u_sbox[i][j] = sbox[i][b];
+                }
+        }
+
+        /*
+         * Convert the inverted S-boxes into 4 arrays of 8 bits.
+         * Each will handle 12 bits of the S-box input.
+         */
+        for (b = 0; b < 4; b++)
+                for (i = 0; i < 64; i++)
+                        for (j = 0; j < 64; j++)
+                                m_sbox[b][(i << 6) | j] =
+                                        (uint8_t)((u_sbox[(b << 1)][i] << 4) |
+                                                u_sbox[(b << 1) + 1][j]);
+
+        /*
+         * Set up the initial & final permutations into a useful form.
+         */
+        for (i = 0; i < 64; i++) {
+                final_perm[i] = IP[i] - 1;
+                init_perm[final_perm[i]] = (uint8_t)i;
+        }
+
+        return cctx;
+}
+
+
+struct des_ctx {
+        const struct const_des_ctx *const_ctx;
+        uint32_t saltbits; /* referenced 5 times */
+        uint32_t old_salt; /* 3 times */
+        uint32_t old_rawkey0, old_rawkey1; /* 3 times each */
+        uint8_t un_pbox[32]; /* 2 times */
+        uint8_t inv_comp_perm[56]; /* 3 times */
+        uint8_t inv_key_perm[64]; /* 3 times */
+        uint32_t en_keysl[16], en_keysr[16]; /* 2 times each */
+        uint32_t de_keysl[16], de_keysr[16]; /* 2 times each */
+        uint32_t ip_maskl[8][256], ip_maskr[8][256]; /* 9 times each */
+        uint32_t fp_maskl[8][256], fp_maskr[8][256]; /* 9 times each */
+        uint32_t key_perm_maskl[8][128], key_perm_maskr[8][128]; /* 9 times */
+        uint32_t comp_maskl[8][128], comp_maskr[8][128]; /* 9 times each */
+        uint32_t psbox[4][256]; /* 5 times */
+};
+#define D (*ctx)
+#define const_ctx       (D.const_ctx      )
+#define saltbits        (D.saltbits       )
+#define old_salt        (D.old_salt       )
+#define old_rawkey0     (D.old_rawkey0    )
+#define old_rawkey1     (D.old_rawkey1    )
+#define un_pbox         (D.un_pbox        )
+#define inv_comp_perm   (D.inv_comp_perm  )
+#define inv_key_perm    (D.inv_key_perm   )
+#define en_keysl        (D.en_keysl       )
+#define en_keysr        (D.en_keysr       )
+#define de_keysl        (D.de_keysl       )
+#define de_keysr        (D.de_keysr       )
+#define ip_maskl        (D.ip_maskl       )
+#define ip_maskr        (D.ip_maskr       )
+#define fp_maskl        (D.fp_maskl       )
+#define fp_maskr        (D.fp_maskr       )
+#define key_perm_maskl  (D.key_perm_maskl )
+#define key_perm_maskr  (D.key_perm_maskr )
+#define comp_maskl      (D.comp_maskl     )
+#define comp_maskr      (D.comp_maskr     )
+#define psbox           (D.psbox          )
+
+static struct des_ctx*
+des_init(struct des_ctx *ctx, const struct const_des_ctx *cctx)
+{
+        int i, j, b, k, inbit, obit;
+        uint32_t *p, *il, *ir, *fl, *fr;
+        const uint32_t *bits28, *bits24;
+
+        if (!ctx)
+                ctx = xmalloc(sizeof(*ctx));
+        const_ctx = cctx;
+
+        old_rawkey0 = old_rawkey1 = 0L;
+        saltbits = 0L;
+        old_salt = 0L;
+        bits28 = bits32 + 4;
+        bits24 = bits28 + 4;
+
+        /*
+         * Initialise the inverted key permutation.
+         */
+        for (i = 0; i < 64; i++) {
+                inv_key_perm[i] = 255;
+        }
+
+        /*
+         * Invert the key permutation and initialise the inverted key
+         * compression permutation.
+         */
+        for (i = 0; i < 56; i++) {
+                inv_key_perm[key_perm[i] - 1] = (uint8_t)i;
+                inv_comp_perm[i] = 255;
+        }
+
+        /*
+         * Invert the key compression permutation.
+         */
+        for (i = 0; i < 48; i++) {
+                inv_comp_perm[comp_perm[i] - 1] = (uint8_t)i;
+        }
+
+        /*
+         * Set up the OR-mask arrays for the initial and final permutations,
+         * and for the key initial and compression permutations.
+         */
+        for (k = 0; k < 8; k++) {
+                for (i = 0; i < 256; i++) {
+                        il = &ip_maskl[k][i];
+                        ir = &ip_maskr[k][i];
+                        fl = &fp_maskl[k][i];
+                        fr = &fp_maskr[k][i];
+                        *il = 0;
+                        *ir = 0;
+                        *fl = 0;
+                        *fr = 0;
+                        for (j = 0; j < 8; j++) {
+                                inbit = 8 * k + j;
+                                if (i & bits8[j]) {
+                                        obit = init_perm[inbit];
+                                        if (obit < 32)
+                                                *il |= bits32[obit];
+                                        else
+                                                *ir |= bits32[obit - 32];
+                                        obit = final_perm[inbit];
+                                        if (obit < 32)
+                                                *fl |= bits32[obit];
+                                        else
+                                                *fr |= bits32[obit - 32];
+                                }
+                        }
+                }
+                for (i = 0; i < 128; i++) {
+                        il = &key_perm_maskl[k][i];
+                        ir = &key_perm_maskr[k][i];
+                        *il = 0;
+                        *ir = 0;
+                        for (j = 0; j < 7; j++) {
+                                inbit = 8 * k + j;
+                                if (i & bits8[j + 1]) {
+                                        obit = inv_key_perm[inbit];
+                                        if (obit == 255)
+                                                continue;
+                                        if (obit < 28)
+                                                *il |= bits28[obit];
+                                        else
+                                                *ir |= bits28[obit - 28];
+                                }
+                        }
+                        il = &comp_maskl[k][i];
+                        ir = &comp_maskr[k][i];
+                        *il = 0;
+                        *ir = 0;
+                        for (j = 0; j < 7; j++) {
+                                inbit = 7 * k + j;
+                                if (i & bits8[j + 1]) {
+                                        obit = inv_comp_perm[inbit];
+                                        if (obit == 255)
+                                                continue;
+                                        if (obit < 24)
+                                                *il |= bits24[obit];
+                                        else
+                                                *ir |= bits24[obit - 24];
+                                }
+                        }
+                }
+        }
+
+        /*
+         * Invert the P-box permutation, and convert into OR-masks for
+         * handling the output of the S-box arrays setup above.
+         */
+        for (i = 0; i < 32; i++)
+                un_pbox[pbox[i] - 1] = (uint8_t)i;
+
+        for (b = 0; b < 4; b++) {
+                for (i = 0; i < 256; i++) {
+                        p = &psbox[b][i];
+                        *p = 0;
+                        for (j = 0; j < 8; j++) {
+                                if (i & bits8[j])
+                                        *p |= bits32[un_pbox[8 * b + j]];
+                        }
+                }
+        }
+
+        return ctx;
+}
+
+
+static void
+setup_salt(struct des_ctx *ctx, uint32_t salt)
+{
+//      const struct const_des_ctx *cctx = const_ctx;
+        uint32_t obit, saltbit;
+        int i;
+
+        if (salt == old_salt)
+                return;
+        old_salt = salt;
+
+        saltbits = 0L;
+        saltbit = 1;
+        obit = 0x800000;
+        for (i = 0; i < 24; i++) {
+                if (salt & saltbit)
+                        saltbits |= obit;
+                saltbit <<= 1;
+                obit >>= 1;
+        }
+}
+
+static void
+des_setkey(struct des_ctx *ctx, const char *key)
+{
+//      const struct const_des_ctx *cctx = const_ctx;
+        uint32_t k0, k1, rawkey0, rawkey1;
+        int shifts, round;
+
+        rawkey0 = ntohl(*(const uint32_t *) key);
+        rawkey1 = ntohl(*(const uint32_t *) (key + 4));
+
+        if ((rawkey0 | rawkey1)
+         && rawkey0 == old_rawkey0
+         && rawkey1 == old_rawkey1
+        ) {
+                /*
+                 * Already setup for this key.
+                 * This optimisation fails on a zero key (which is weak and
+                 * has bad parity anyway) in order to simplify the starting
+                 * conditions.
+                 */
+                return;
+        }
+        old_rawkey0 = rawkey0;
+        old_rawkey1 = rawkey1;
+
+        /*
+         *      Do key permutation and split into two 28-bit subkeys.
+         */
+        k0 = key_perm_maskl[0][rawkey0 >> 25]
+           | key_perm_maskl[1][(rawkey0 >> 17) & 0x7f]
+           | key_perm_maskl[2][(rawkey0 >> 9) & 0x7f]
+           | key_perm_maskl[3][(rawkey0 >> 1) & 0x7f]
+           | key_perm_maskl[4][rawkey1 >> 25]
+           | key_perm_maskl[5][(rawkey1 >> 17) & 0x7f]
+           | key_perm_maskl[6][(rawkey1 >> 9) & 0x7f]
+           | key_perm_maskl[7][(rawkey1 >> 1) & 0x7f];
+        k1 = key_perm_maskr[0][rawkey0 >> 25]
+           | key_perm_maskr[1][(rawkey0 >> 17) & 0x7f]
+           | key_perm_maskr[2][(rawkey0 >> 9) & 0x7f]
+           | key_perm_maskr[3][(rawkey0 >> 1) & 0x7f]
+           | key_perm_maskr[4][rawkey1 >> 25]
+           | key_perm_maskr[5][(rawkey1 >> 17) & 0x7f]
+           | key_perm_maskr[6][(rawkey1 >> 9) & 0x7f]
+           | key_perm_maskr[7][(rawkey1 >> 1) & 0x7f];
+        /*
+         *      Rotate subkeys and do compression permutation.
+         */
+        shifts = 0;
+        for (round = 0; round < 16; round++) {
+                uint32_t t0, t1;
+
+                shifts += key_shifts[round];
+
+                t0 = (k0 << shifts) | (k0 >> (28 - shifts));
+                t1 = (k1 << shifts) | (k1 >> (28 - shifts));
+
+                de_keysl[15 - round] =
+                en_keysl[round] = comp_maskl[0][(t0 >> 21) & 0x7f]
+                                | comp_maskl[1][(t0 >> 14) & 0x7f]
+                                | comp_maskl[2][(t0 >> 7) & 0x7f]
+                                | comp_maskl[3][t0 & 0x7f]
+                                | comp_maskl[4][(t1 >> 21) & 0x7f]
+                                | comp_maskl[5][(t1 >> 14) & 0x7f]
+                                | comp_maskl[6][(t1 >> 7) & 0x7f]
+                                | comp_maskl[7][t1 & 0x7f];
+
+                de_keysr[15 - round] =
+                en_keysr[round] = comp_maskr[0][(t0 >> 21) & 0x7f]
+                                | comp_maskr[1][(t0 >> 14) & 0x7f]
+                                | comp_maskr[2][(t0 >> 7) & 0x7f]
+                                | comp_maskr[3][t0 & 0x7f]
+                                | comp_maskr[4][(t1 >> 21) & 0x7f]
+                                | comp_maskr[5][(t1 >> 14) & 0x7f]
+                                | comp_maskr[6][(t1 >> 7) & 0x7f]
+                                | comp_maskr[7][t1 & 0x7f];
+        }
+}
+
+
+static int
+do_des(struct des_ctx *ctx, uint32_t l_in, uint32_t r_in, uint32_t *l_out, uint32_t *r_out, int count)
+{
+        const struct const_des_ctx *cctx = const_ctx;
+        /*
+         * l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format.
+         */
+        uint32_t l, r, *kl, *kr, *kl1, *kr1;
+        uint32_t f = f; /* silence gcc */
+        uint32_t r48l, r48r;
+        int round;
+
+        /*
+         * Encrypting
+         */
+        kl1 = en_keysl;
+        kr1 = en_keysr;
+
+        /*
+         *      Do initial permutation (IP).
+         */
+        l = ip_maskl[0][l_in >> 24]
+          | ip_maskl[1][(l_in >> 16) & 0xff]
+          | ip_maskl[2][(l_in >> 8) & 0xff]
+          | ip_maskl[3][l_in & 0xff]
+          | ip_maskl[4][r_in >> 24]
+          | ip_maskl[5][(r_in >> 16) & 0xff]
+          | ip_maskl[6][(r_in >> 8) & 0xff]
+          | ip_maskl[7][r_in & 0xff];
+        r = ip_maskr[0][l_in >> 24]
+          | ip_maskr[1][(l_in >> 16) & 0xff]
+          | ip_maskr[2][(l_in >> 8) & 0xff]
+          | ip_maskr[3][l_in & 0xff]
+          | ip_maskr[4][r_in >> 24]
+          | ip_maskr[5][(r_in >> 16) & 0xff]
+          | ip_maskr[6][(r_in >> 8) & 0xff]
+          | ip_maskr[7][r_in & 0xff];
+
+        while (count--) {
+                /*
+                 * Do each round.
+                 */
+                kl = kl1;
+                kr = kr1;
+                round = 16;
+                while (round--) {
+                        /*
+                         * Expand R to 48 bits (simulate the E-box).
+                         */
+                        r48l    = ((r & 0x00000001) << 23)
+                                | ((r & 0xf8000000) >> 9)
+                                | ((r & 0x1f800000) >> 11)
+                                | ((r & 0x01f80000) >> 13)
+                                | ((r & 0x001f8000) >> 15);
+
+                        r48r    = ((r & 0x0001f800) << 7)
+                                | ((r & 0x00001f80) << 5)
+                                | ((r & 0x000001f8) << 3)
+                                | ((r & 0x0000001f) << 1)
+                                | ((r & 0x80000000) >> 31);
+                        /*
+                         * Do salting for crypt() and friends, and
+                         * XOR with the permuted key.
+                         */
+                        f = (r48l ^ r48r) & saltbits;
+                        r48l ^= f ^ *kl++;
+                        r48r ^= f ^ *kr++;
+                        /*
+                         * Do sbox lookups (which shrink it back to 32 bits)
+                         * and do the pbox permutation at the same time.
+                         */
+                        f = psbox[0][m_sbox[0][r48l >> 12]]
+                          | psbox[1][m_sbox[1][r48l & 0xfff]]
+                          | psbox[2][m_sbox[2][r48r >> 12]]
+                          | psbox[3][m_sbox[3][r48r & 0xfff]];
+                        /*
+                         * Now that we've permuted things, complete f().
+                         */
+                        f ^= l;
+                        l = r;
+                        r = f;
+                }
+                r = l;
+                l = f;
+        }
+        /*
+         * Do final permutation (inverse of IP).
+         */
+        *l_out  = fp_maskl[0][l >> 24]
+                | fp_maskl[1][(l >> 16) & 0xff]
+                | fp_maskl[2][(l >> 8) & 0xff]
+                | fp_maskl[3][l & 0xff]
+                | fp_maskl[4][r >> 24]
+                | fp_maskl[5][(r >> 16) & 0xff]
+                | fp_maskl[6][(r >> 8) & 0xff]
+                | fp_maskl[7][r & 0xff];
+        *r_out  = fp_maskr[0][l >> 24]
+                | fp_maskr[1][(l >> 16) & 0xff]
+                | fp_maskr[2][(l >> 8) & 0xff]
+                | fp_maskr[3][l & 0xff]
+                | fp_maskr[4][r >> 24]
+                | fp_maskr[5][(r >> 16) & 0xff]
+                | fp_maskr[6][(r >> 8) & 0xff]
+                | fp_maskr[7][r & 0xff];
+        return 0;
+}
+
+#define DES_OUT_BUFSIZE 21
+
+static char *
+des_crypt(struct des_ctx *ctx, char output[21], const unsigned char *key, const unsigned char *setting)
+{
+        uint32_t salt, l, r0, r1, keybuf[2];
+        uint8_t *p, *q;
+
+        /*
+         * Copy the key, shifting each character up by one bit
+         * and padding with zeros.
+         */
+        q = (uint8_t *)keybuf;
+        while (q - (uint8_t *)keybuf - 8) {
+                *q++ = *key << 1;
+                if (*(q - 1))
+                        key++;
+        }
+        des_setkey(ctx, (char *)keybuf);
+
+        /*
+         * setting - 2 bytes of salt
+         * key - up to 8 characters
+         */
+        salt = (ascii_to_bin(setting[1]) << 6)
+             |  ascii_to_bin(setting[0]);
+
+        output[0] = setting[0];
+        /*
+         * If the encrypted password that the salt was extracted from
+         * is only 1 character long, the salt will be corrupted.  We
+         * need to ensure that the output string doesn't have an extra
+         * NUL in it!
+         */
+        output[1] = setting[1] ? setting[1] : output[0];
+
+        p = (uint8_t *)output + 2;
+
+        setup_salt(ctx, salt);
+        /*
+         * Do it.
+         */
+        do_des(ctx, 0L, 0L, &r0, &r1, 25 /* count */);
+
+        /*
+         * Now encode the result...
+         */
+        l = (r0 >> 8);
+        *p++ = ascii64[(l >> 18) & 0x3f];
+        *p++ = ascii64[(l >> 12) & 0x3f];
+        *p++ = ascii64[(l >> 6) & 0x3f];
+        *p++ = ascii64[l & 0x3f];
+
+        l = (r0 << 16) | ((r1 >> 16) & 0xffff);
+        *p++ = ascii64[(l >> 18) & 0x3f];
+        *p++ = ascii64[(l >> 12) & 0x3f];
+        *p++ = ascii64[(l >> 6) & 0x3f];
+        *p++ = ascii64[l & 0x3f];
+
+        l = r1 << 2;
+        *p++ = ascii64[(l >> 12) & 0x3f];
+        *p++ = ascii64[(l >> 6) & 0x3f];
+        *p++ = ascii64[l & 0x3f];
+        *p = 0;
+
+        return output;
+}
+
+// des_setkey never fails
+
+#undef C
+#undef init_perm
+#undef final_perm
+#undef m_sbox
+#undef D
+#undef const_ctx
+#undef saltbits
+#undef old_salt
+#undef old_rawkey0
+#undef old_rawkey1
+#undef un_pbox
+#undef inv_comp_perm
+#undef inv_key_perm
+#undef en_keysl
+#undef en_keysr
+#undef de_keysl
+#undef de_keysr
+#undef ip_maskl
+#undef ip_maskr
+#undef fp_maskl
+#undef fp_maskr
+#undef key_perm_maskl
+#undef key_perm_maskr
+#undef comp_maskl
+#undef comp_maskr
+#undef psbox
diff --git a/libbb/pw_encrypt_md5.c b/libbb/pw_encrypt_md5.c
new file mode 100644
index 000000000..42eb13440
--- /dev/null
+++ b/libbb/pw_encrypt_md5.c
@@ -0,0 +1,656 @@
+/*
+ * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
+ *
+ * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+ * rights reserved.
+ *
+ * License to copy and use this software is granted provided that it
+ * is identified as the "RSA Data Security, Inc. MD5 Message-Digest
+ * Algorithm" in all material mentioning or referencing this software
+ * or this function.
+ *
+ * License is also granted to make and use derivative works provided
+ * that such works are identified as "derived from the RSA Data
+ * Security, Inc. MD5 Message-Digest Algorithm" in all material
+ * mentioning or referencing the derived work.
+ *
+ * RSA Data Security, Inc. makes no representations concerning either
+ * the merchantability of this software or the suitability of this
+ * software for any particular purpose. It is provided "as is"
+ * without express or implied warranty of any kind.
+ *
+ * These notices must be retained in any copies of any part of this
+ * documentation and/or software.
+ *
+ * $FreeBSD: src/lib/libmd/md5c.c,v 1.9.2.1 1999/08/29 14:57:12 peter Exp $
+ *
+ * This code is the same as the code published by RSA Inc.  It has been
+ * edited for clarity and style only.
+ *
+ * ----------------------------------------------------------------------------
+ * The md5_crypt() function was taken from freeBSD's libcrypt and contains
+ * this license:
+ *    "THE BEER-WARE LICENSE" (Revision 42):
+ *     <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
+ *     can do whatever you want with this stuff. If we meet some day, and you think
+ *     this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
+ *
+ * $FreeBSD: src/lib/libcrypt/crypt.c,v 1.7.2.1 1999/08/29 14:56:33 peter Exp $
+ *
+ * ----------------------------------------------------------------------------
+ * On April 19th, 2001 md5_crypt() was modified to make it reentrant
+ * by Erik Andersen <andersen@uclibc.org>
+ *
+ *
+ * June 28, 2001             Manuel Novoa III
+ *
+ * "Un-inlined" code using loops and static const tables in order to
+ * reduce generated code size (on i386 from approx 4k to approx 2.5k).
+ *
+ * June 29, 2001             Manuel Novoa III
+ *
+ * Completely removed static PADDING array.
+ *
+ * Reintroduced the loop unrolling in MD5_Transform and added the
+ * MD5_SIZE_OVER_SPEED option for configurability.  Define below as:
+ *       0    fully unrolled loops
+ *       1    partially unrolled (4 ops per loop)
+ *       2    no unrolling -- introduces the need to swap 4 variables (slow)
+ *       3    no unrolling and all 4 loops merged into one with switch
+ *               in each loop (glacial)
+ * On i386, sizes are roughly (-Os -fno-builtin):
+ *     0: 3k     1: 2.5k     2: 2.2k     3: 2k
+ *
+ *
+ * Since SuSv3 does not require crypt_r, modified again August 7, 2002
+ * by Erik Andersen to remove reentrance stuff...
+ */
+
+/*
+ * Valid values are  1 (fastest/largest) to 3 (smallest/slowest).
+ */
+#define MD5_SIZE_OVER_SPEED 3
+
+/**********************************************************************/
+
+/* MD5 context. */
+struct MD5Context {
+        uint32_t state[4];      /* state (ABCD) */
+        uint32_t count[2];      /* number of bits, modulo 2^64 (lsb first) */
+        unsigned char buffer[64];       /* input buffer */
+};
+
+static void __md5_Init(struct MD5Context *);
+static void __md5_Update(struct MD5Context *, const unsigned char *, unsigned int);
+static void __md5_Pad(struct MD5Context *);
+static void __md5_Final(unsigned char [16], struct MD5Context *);
+static void __md5_Transform(uint32_t [4], const unsigned char [64]);
+
+
+#define MD5_MAGIC_STR "$1$"
+#define MD5_MAGIC_LEN (sizeof(MD5_MAGIC_STR) - 1)
+static const unsigned char __md5__magic[] = MD5_MAGIC_STR;
+
+
+#ifdef i386
+#define __md5_Encode memcpy
+#define __md5_Decode memcpy
+#else /* i386 */
+
+/*
+ * __md5_Encodes input (uint32_t) into output (unsigned char). Assumes len is
+ * a multiple of 4.
+ */
+
+static void
+__md5_Encode(unsigned char *output, uint32_t *input, unsigned int len)
+{
+        unsigned int i, j;
+
+        for (i = 0, j = 0; j < len; i++, j += 4) {
+                output[j] = input[i];
+                output[j+1] = (input[i] >> 8);
+                output[j+2] = (input[i] >> 16);
+                output[j+3] = (input[i] >> 24);
+        }
+}
+
+/*
+ * __md5_Decodes input (unsigned char) into output (uint32_t). Assumes len is
+ * a multiple of 4.
+ */
+
+static void
+__md5_Decode(uint32_t *output, const unsigned char *input, unsigned int len)
+{
+        unsigned int i, j;
+
+        for (i = 0, j = 0; j < len; i++, j += 4)
+                output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
+                    (((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
+}
+#endif /* i386 */
+
+/* F, G, H and I are basic MD5 functions. */
+#define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
+#define G(x, y, z) (((x) & (z)) | ((y) & ~(z)))
+#define H(x, y, z) ((x) ^ (y) ^ (z))
+#define I(x, y, z) ((y) ^ ((x) | ~(z)))
+
+/* ROTATE_LEFT rotates x left n bits. */
+#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
+
+/*
+ * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
+ * Rotation is separate from addition to prevent recomputation.
+ */
+#define FF(a, b, c, d, x, s, ac) { \
+        (a) += F ((b), (c), (d)) + (x) + (uint32_t)(ac); \
+        (a) = ROTATE_LEFT((a), (s)); \
+        (a) += (b); \
+        }
+#define GG(a, b, c, d, x, s, ac) { \
+        (a) += G ((b), (c), (d)) + (x) + (uint32_t)(ac); \
+        (a) = ROTATE_LEFT((a), (s)); \
+        (a) += (b); \
+        }
+#define HH(a, b, c, d, x, s, ac) { \
+        (a) += H ((b), (c), (d)) + (x) + (uint32_t)(ac); \
+        (a) = ROTATE_LEFT((a), (s)); \
+        (a) += (b); \
+        }
+#define II(a, b, c, d, x, s, ac) { \
+        (a) += I ((b), (c), (d)) + (x) + (uint32_t)(ac); \
+        (a) = ROTATE_LEFT((a), (s)); \
+        (a) += (b); \
+        }
+
+/* MD5 initialization. Begins an MD5 operation, writing a new context. */
+
+static void __md5_Init(struct MD5Context *context)
+{
+        context->count[0] = context->count[1] = 0;
+
+        /* Load magic initialization constants.  */
+        context->state[0] = 0x67452301;
+        context->state[1] = 0xefcdab89;
+        context->state[2] = 0x98badcfe;
+        context->state[3] = 0x10325476;
+}
+
+/*
+ * MD5 block update operation. Continues an MD5 message-digest
+ * operation, processing another message block, and updating the
+ * context.
+ */
+
+static void __md5_Update(struct MD5Context *context, const unsigned char *input, unsigned int inputLen)
+{
+        unsigned int i, idx, partLen;
+
+        /* Compute number of bytes mod 64 */
+        idx = (context->count[0] >> 3) & 0x3F;
+
+        /* Update number of bits */
+        context->count[0] += (inputLen << 3);
+        if (context->count[0] < (inputLen << 3))
+                context->count[1]++;
+        context->count[1] += (inputLen >> 29);
+
+        partLen = 64 - idx;
+
+        /* Transform as many times as possible. */
+        if (inputLen >= partLen) {
+                memcpy(&context->buffer[idx], input, partLen);
+                __md5_Transform(context->state, context->buffer);
+
+                for (i = partLen; i + 63 < inputLen; i += 64)
+                        __md5_Transform(context->state, &input[i]);
+
+                idx = 0;
+        } else
+                i = 0;
+
+        /* Buffer remaining input */
+        memcpy(&context->buffer[idx], &input[i], inputLen - i);
+}
+
+/*
+ * MD5 padding. Adds padding followed by original length.
+ */
+
+static void __md5_Pad(struct MD5Context *context)
+{
+        unsigned char bits[8];
+        unsigned int idx, padLen;
+        unsigned char PADDING[64];
+
+        memset(PADDING, 0, sizeof(PADDING));
+        PADDING[0] = 0x80;
+
+        /* Save number of bits */
+        __md5_Encode(bits, context->count, 8);
+
+        /* Pad out to 56 mod 64. */
+        idx = (context->count[0] >> 3) & 0x3f;
+        padLen = (idx < 56) ? (56 - idx) : (120 - idx);
+        __md5_Update(context, PADDING, padLen);
+
+        /* Append length (before padding) */
+        __md5_Update(context, bits, 8);
+}
+
+/*
+ * MD5 finalization. Ends an MD5 message-digest operation, writing the
+ * the message digest and zeroizing the context.
+ */
+
+static void __md5_Final(unsigned char digest[16], struct MD5Context *context)
+{
+        /* Do padding. */
+        __md5_Pad(context);
+
+        /* Store state in digest */
+        __md5_Encode(digest, context->state, 16);
+
+        /* Zeroize sensitive information. */
+        memset(context, 0, sizeof(*context));
+}
+
+/* MD5 basic transformation. Transforms state based on block. */
+
+static void __md5_Transform(uint32_t state[4], const unsigned char block[64])
+{
+        uint32_t a, b, c, d, x[16];
+#if MD5_SIZE_OVER_SPEED > 1
+        uint32_t temp;
+        const unsigned char *ps;
+
+        static const unsigned char S[] = {
+                7, 12, 17, 22,
+                5, 9, 14, 20,
+                4, 11, 16, 23,
+                6, 10, 15, 21
+        };
+#endif /* MD5_SIZE_OVER_SPEED > 1 */
+
+#if MD5_SIZE_OVER_SPEED > 0
+        const uint32_t *pc;
+        const unsigned char *pp;
+        int i;
+
+        static const uint32_t C[] = {
+                                                                /* round 1 */
+                0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
+                0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
+                0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
+                0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
+                                                                /* round 2 */
+                0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
+                0xd62f105d, 0x2441453,  0xd8a1e681, 0xe7d3fbc8,
+                0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
+                0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
+                                                                /* round 3 */
+                0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
+                0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
+                0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05,
+                0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
+                                                                /* round 4 */
+                0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
+                0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
+                0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
+                0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
+        };
+
+        static const unsigned char P[] = {
+                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, /* 1 */
+                1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, /* 2 */
+                5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2, /* 3 */
+                0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9  /* 4 */
+        };
+
+#endif /* MD5_SIZE_OVER_SPEED > 0 */
+
+        __md5_Decode(x, block, 64);
+
+        a = state[0]; b = state[1]; c = state[2]; d = state[3];
+
+#if MD5_SIZE_OVER_SPEED > 2
+        pc = C; pp = P; ps = S - 4;
+
+        for (i = 0; i < 64; i++) {
+                if ((i & 0x0f) == 0) ps += 4;
+                temp = a;
+                switch (i>>4) {
+                        case 0:
+                                temp += F(b, c, d);
+                                break;
+                        case 1:
+                                temp += G(b, c, d);
+                                break;
+                        case 2:
+                                temp += H(b, c, d);
+                                break;
+                        case 3:
+                                temp += I(b, c, d);
+                                break;
+                }
+                temp += x[*pp++] + *pc++;
+                temp = ROTATE_LEFT(temp, ps[i & 3]);
+                temp += b;
+                a = d; d = c; c = b; b = temp;
+        }
+#elif MD5_SIZE_OVER_SPEED > 1
+        pc = C; pp = P; ps = S;
+
+        /* Round 1 */
+        for (i = 0; i < 16; i++) {
+                FF(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++;
+                temp = d; d = c; c = b; b = a; a = temp;
+        }
+
+        /* Round 2 */
+        ps += 4;
+        for (; i < 32; i++) {
+                GG(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++;
+                temp = d; d = c; c = b; b = a; a = temp;
+        }
+        /* Round 3 */
+        ps += 4;
+        for (; i < 48; i++) {
+                HH(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++;
+                temp = d; d = c; c = b; b = a; a = temp;
+        }
+
+        /* Round 4 */
+        ps += 4;
+        for (; i < 64; i++) {
+                II(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++;
+                temp = d; d = c; c = b; b = a; a = temp;
+        }
+#elif MD5_SIZE_OVER_SPEED > 0
+        pc = C; pp = P;
+
+        /* Round 1 */
+        for (i = 0; i < 4; i++) {
+                FF(a, b, c, d, x[*pp],  7, *pc); pp++; pc++;
+                FF(d, a, b, c, x[*pp], 12, *pc); pp++; pc++;
+                FF(c, d, a, b, x[*pp], 17, *pc); pp++; pc++;
+                FF(b, c, d, a, x[*pp], 22, *pc); pp++; pc++;
+        }
+
+        /* Round 2 */
+        for (i = 0; i < 4; i++) {
+                GG(a, b, c, d, x[*pp],  5, *pc); pp++; pc++;
+                GG(d, a, b, c, x[*pp],  9, *pc); pp++; pc++;
+                GG(c, d, a, b, x[*pp], 14, *pc); pp++; pc++;
+                GG(b, c, d, a, x[*pp], 20, *pc); pp++; pc++;
+        }
+        /* Round 3 */
+        for (i = 0; i < 4; i++) {
+                HH(a, b, c, d, x[*pp],  4, *pc); pp++; pc++;
+                HH(d, a, b, c, x[*pp], 11, *pc); pp++; pc++;
+                HH(c, d, a, b, x[*pp], 16, *pc); pp++; pc++;
+                HH(b, c, d, a, x[*pp], 23, *pc); pp++; pc++;
+        }
+
+        /* Round 4 */
+        for (i = 0; i < 4; i++) {
+                II(a, b, c, d, x[*pp],  6, *pc); pp++; pc++;
+                II(d, a, b, c, x[*pp], 10, *pc); pp++; pc++;
+                II(c, d, a, b, x[*pp], 15, *pc); pp++; pc++;
+                II(b, c, d, a, x[*pp], 21, *pc); pp++; pc++;
+        }
+#else
+        /* Round 1 */
+#define S11 7
+#define S12 12
+#define S13 17
+#define S14 22
+        FF(a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
+        FF(d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
+        FF(c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
+        FF(b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
+        FF(a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
+        FF(d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
+        FF(c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
+        FF(b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
+        FF(a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
+        FF(d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
+        FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
+        FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
+        FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
+        FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
+        FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
+        FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
+
+        /* Round 2 */
+#define S21 5
+#define S22 9
+#define S23 14
+#define S24 20
+        GG(a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
+        GG(d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
+        GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
+        GG(b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
+        GG(a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
+        GG(d, a, b, c, x[10], S22,  0x2441453); /* 22 */
+        GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
+        GG(b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
+        GG(a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
+        GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
+        GG(c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
+        GG(b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
+        GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
+        GG(d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
+        GG(c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
+        GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
+
+        /* Round 3 */
+#define S31 4
+#define S32 11
+#define S33 16
+#define S34 23
+        HH(a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
+        HH(d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
+        HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
+        HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
+        HH(a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
+        HH(d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
+        HH(c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
+        HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
+        HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
+        HH(d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
+        HH(c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
+        HH(b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
+        HH(a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
+        HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
+        HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
+        HH(b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
+
+        /* Round 4 */
+#define S41 6
+#define S42 10
+#define S43 15
+#define S44 21
+        II(a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
+        II(d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
+        II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
+        II(b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
+        II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
+        II(d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
+        II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
+        II(b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
+        II(a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
+        II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
+        II(c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
+        II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
+        II(a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
+        II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
+        II(c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
+        II(b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
+#endif
+
+        state[0] += a;
+        state[1] += b;
+        state[2] += c;
+        state[3] += d;
+
+        /* Zeroize sensitive information. */
+        memset(x, 0, sizeof(x));
+}
+
+
+static void
+__md5_to64(char *s, unsigned long v, int n)
+{
+        while (--n >= 0) {
+                *s++ = ascii64[v & 0x3f];
+                v >>= 6;
+        }
+}
+
+/*
+ * UNIX password
+ *
+ * Use MD5 for what it is best at...
+ */
+#define MD5_OUT_BUFSIZE 120
+
+static char *
+md5_crypt(char passwd[120], const unsigned char *pw, const unsigned char *salt)
+{
+        const unsigned char *sp, *ep;
+        char *p;
+        unsigned char final[17];        /* final[16] exists only to aid in looping */
+        int sl, pl, i, pw_len;
+        struct MD5Context ctx, ctx1;
+        unsigned long l;
+
+        /* Refine the Salt first */
+        sp = salt;
+
+// always true for bbox
+//      /* If it starts with the magic string, then skip that */
+//      if (!strncmp(sp, __md5__magic, MD5_MAGIC_LEN))
+                sp += MD5_MAGIC_LEN;
+
+        /* It stops at the first '$', max 8 chars */
+        for (ep = sp; *ep && *ep != '$' && ep < (sp+8); ep++)
+                continue;
+
+        /* get the length of the true salt */
+        sl = ep - sp;
+
+        __md5_Init(&ctx);
+
+        /* The password first, since that is what is most unknown */
+        pw_len = strlen((char*)pw);
+        __md5_Update(&ctx, pw, pw_len);
+
+        /* Then our magic string */
+        __md5_Update(&ctx, __md5__magic, MD5_MAGIC_LEN);
+
+        /* Then the raw salt */
+        __md5_Update(&ctx, sp, sl);
+
+        /* Then just as many characters of the MD5(pw, salt, pw) */
+        __md5_Init(&ctx1);
+        __md5_Update(&ctx1, pw, pw_len);
+        __md5_Update(&ctx1, sp, sl);
+        __md5_Update(&ctx1, pw, pw_len);
+        __md5_Final(final, &ctx1);
+        for (pl = pw_len; pl > 0; pl -= 16)
+                __md5_Update(&ctx, final, pl > 16 ? 16 : pl);
+
+        /* Don't leave anything around in vm they could use. */
+//TODO: the above comment seems to be wrong. final is used later.
+        memset(final, 0, sizeof(final));
+
+        /* Then something really weird... */
+        for (i = pw_len; i; i >>= 1) {
+                __md5_Update(&ctx, ((i & 1) ? final : (const unsigned char *) pw), 1);
+        }
+
+        /* Now make the output string */
+        passwd[0] = '$';
+        passwd[1] = '1';
+        passwd[2] = '$';
+        strncpy(passwd + 3, (char*)sp, sl);
+        passwd[sl + 3] = '$';
+        passwd[sl + 4] = '\0';
+
+        __md5_Final(final, &ctx);
+
+        /*
+         * and now, just to make sure things don't run too fast
+         * On a 60 Mhz Pentium this takes 34 msec, so you would
+         * need 30 seconds to build a 1000 entry dictionary...
+         */
+        for (i = 0; i < 1000; i++) {
+                __md5_Init(&ctx1);
+                if (i & 1)
+                        __md5_Update(&ctx1, pw, pw_len);
+                else
+                        __md5_Update(&ctx1, final, 16);
+
+                if (i % 3)
+                        __md5_Update(&ctx1, sp, sl);
+
+                if (i % 7)
+                        __md5_Update(&ctx1, pw, pw_len);
+
+                if (i & 1)
+                        __md5_Update(&ctx1, final, 16);
+                else
+                        __md5_Update(&ctx1, pw, pw_len);
+                __md5_Final(final, &ctx1);
+        }
+
+        p = passwd + sl + 4; /*strlen(passwd);*/
+
+        final[16] = final[5];
+        for (i = 0; i < 5; i++) {
+                l = (final[i] << 16) | (final[i+6] << 8) | final[i+12];
+                __md5_to64(p, l, 4); p += 4;
+        }
+        l = final[11];
+        __md5_to64(p, l, 2); p += 2;
+        *p = '\0';
+
+        /* Don't leave anything around in vm they could use. */
+        memset(final, 0, sizeof(final));
+
+        return passwd;
+}
+
+#undef MD5_SIZE_OVER_SPEED
+#undef MD5_MAGIC_STR
+#undef MD5_MAGIC_LEN
+#undef __md5_Encode
+#undef __md5_Decode
+#undef F
+#undef G
+#undef H
+#undef I
+#undef ROTATE_LEFT
+#undef FF
+#undef GG
+#undef HH
+#undef II
+#undef S11
+#undef S12
+#undef S13
+#undef S14
+#undef S21
+#undef S22
+#undef S23
+#undef S24
+#undef S31
+#undef S32
+#undef S33
+#undef S34
+#undef S41
+#undef S42
+#undef S43
+#undef S44
diff --git a/loginutils/chpasswd.c b/loginutils/chpasswd.c
index 5dc7a9bf0..230ab0fc9 100644
--- a/loginutils/chpasswd.c
+++ b/loginutils/chpasswd.c
@@ -47,7 +47,7 @@ int chpasswd_main(int argc ATTRIBUTE_UNUSED, char **argv)
                                 strcpy(salt, "$1$");
                                 rnd = crypt_make_salt(salt + 3, 4, rnd);
                         }
-                        pass = pw_encrypt(pass, salt);
+                        pass = pw_encrypt(pass, salt, 0);
                 }
 
                 /* This is rather complex: if user is not found in /etc/shadow,
diff --git a/loginutils/cryptpw.c b/loginutils/cryptpw.c
index 68f5e8074..1acbc6db0 100644
--- a/loginutils/cryptpw.c
+++ b/loginutils/cryptpw.c
@@ -7,6 +7,30 @@
 
 #include "libbb.h"
 
+#define TESTING 0
+
+/*
+set TESTING to 1 and pipe some file through this script
+if you played with bbox's crypt implementation.
+
+while read line; do
+        n=`./busybox cryptpw -a des -- "$line"`
+        o=`./busybox_old cryptpw -a des -- "$line"`
+        test "$n" != "$o" && {
+                echo n="$n"
+                echo o="$o"
+                exit
+        }
+        n=`./busybox cryptpw -- "$line"`
+        o=`./busybox_old cryptpw -- "$line"`
+        test "$n" != "$o" && {
+                echo n="$n"
+                echo o="$o"
+                exit
+        }
+done
+ */
+
 int cryptpw_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int cryptpw_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
@@ -18,11 +42,17 @@ int cryptpw_main(int argc ATTRIBUTE_UNUSED, char **argv)
                 //((uint32_t*)&salt)[0] = '$' + '1'*0x100 + '$'*0x10000;
                 /* Hope one day gcc will do it itself (inlining strcpy) */
                 crypt_make_salt(salt + 3, 4, 0); /* md5 */
+#if TESTING
+                strcpy(salt + 3, "ajg./bcf");
+#endif
         } else {
                 crypt_make_salt(salt, 1, 0);     /* des */
+#if TESTING
+                strcpy(salt, "a.");
+#endif
         }
 
-        puts(pw_encrypt(argv[optind] ? argv[optind] : xmalloc_fgetline(stdin), salt));
+        puts(pw_encrypt(argv[optind] ? argv[optind] : xmalloc_fgetline(stdin), salt, 1));
 
         return 0;
 }
diff --git a/loginutils/passwd.c b/loginutils/passwd.c
index 3353db1fa..fad226c00 100644
--- a/loginutils/passwd.c
+++ b/loginutils/passwd.c
@@ -24,7 +24,7 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
                 orig = bb_askpass(0, "Old password:"); /* returns ptr to static */
                 if (!orig)
                         goto err_ret;
-                cipher = pw_encrypt(orig, pw->pw_passwd); /* returns ptr to static */
+                cipher = pw_encrypt(orig, pw->pw_passwd, 1); /* returns ptr to static */
                 if (strcmp(cipher, pw->pw_passwd) != 0) {
                         syslog(LOG_WARNING, "incorrect password for '%s'",
                                 pw->pw_name);
@@ -56,7 +56,7 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
                 crypt_make_salt(salt + 3, 4, 0);
         }
         /* pw_encrypt returns ptr to static */
-        ret = xstrdup(pw_encrypt(newp, salt));
+        ret = xstrdup(pw_encrypt(newp, salt, 1));
         /* whee, success! */
 
  err_ret:
diff --git a/loginutils/sulogin.c b/loginutils/sulogin.c
index 17bb15efa..f52ce8a95 100644
--- a/loginutils/sulogin.c
+++ b/loginutils/sulogin.c
@@ -81,7 +81,7 @@ int sulogin_main(int argc ATTRIBUTE_UNUSED, char **argv)
                         bb_info_msg("Normal startup");
                         return 0;
                 }
-                if (strcmp(pw_encrypt(cp, pwd->pw_passwd), pwd->pw_passwd) == 0) {
+                if (strcmp(pw_encrypt(cp, pwd->pw_passwd, 1), pwd->pw_passwd) == 0) {
                         break;
                 }
                 bb_do_delay(FAIL_DELAY);
diff --git a/networking/httpd.c b/networking/httpd.c
index 4da7e5c65..78c6f4d1d 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -1733,7 +1733,7 @@ static int checkPerm(const char *path, const char *request)
                                  && pp[3] == '$' && pp[4]
                                 ) {
                                         pp++;
-                                        cipher = pw_encrypt(u+1, pp);
+                                        cipher = pw_encrypt(u+1, pp, 1);
                                         if (strcmp(cipher, pp) == 0)
                                                 goto set_remoteuser_var;   /* Ok */
                                         /* unauthorized */
@@ -2352,7 +2352,7 @@ int httpd_main(int argc ATTRIBUTE_UNUSED, char **argv)
 #endif
 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
         if (opt & OPT_MD5) {
-                puts(pw_encrypt(pass, "$1$"));
+                puts(pw_encrypt(pass, "$1$", 1));
                 return 0;
         }
 #endif