/*

 * Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <string.h>

#include "apps.h"

#include "progs.h"

#include <openssl/bio.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/rand.h>

#ifndef OPENSSL_NO_DES

# include <openssl/des.h>

#endif

#include <openssl/md5.h>

#include <openssl/sha.h>

static unsigned const char cov_2char[64] = {

    /* from crypto/des/fcrypt.c */

    0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,

    0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,

    0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,

    0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,

    0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,

    0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,

    0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,

    0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A

};

static const char ascii_dollar[] = { 0x24, 0x00 };

typedef enum {

    passwd_unset = 0,

    passwd_crypt,

    passwd_md5,

    passwd_apr1,

    passwd_sha256,

    passwd_sha512,

    passwd_aixmd5

} passwd_modes;

static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,

                     char *passwd, BIO *out, int quiet, int table,

                     int reverse, size_t pw_maxlen, passwd_modes mode);

typedef enum OPTION_choice {

    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,

    OPT_IN,

    OPT_NOVERIFY, OPT_QUIET, OPT_TABLE, OPT_REVERSE, OPT_APR1,

    OPT_1, OPT_5, OPT_6, OPT_CRYPT, OPT_AIXMD5, OPT_SALT, OPT_STDIN,

    OPT_R_ENUM

} OPTION_CHOICE;

const OPTIONS passwd_options[] = {

    {"help", OPT_HELP, '-', "Display this summary"},

    {"in", OPT_IN, '<', "Read passwords from file"},

    {"noverify", OPT_NOVERIFY, '-',

     "Never verify when reading password from terminal"},

    {"quiet", OPT_QUIET, '-', "No warnings"},

    {"table", OPT_TABLE, '-', "Format output as table"},

    {"reverse", OPT_REVERSE, '-', "Switch table columns"},

    {"salt", OPT_SALT, 's', "Use provided salt"},

    {"stdin", OPT_STDIN, '-', "Read passwords from stdin"},

    {"6", OPT_6, '-', "SHA512-based password algorithm"},

    {"5", OPT_5, '-', "SHA256-based password algorithm"},

    {"apr1", OPT_APR1, '-', "MD5-based password algorithm, Apache variant"},

    {"1", OPT_1, '-', "MD5-based password algorithm"},

    {"aixmd5", OPT_AIXMD5, '-', "AIX MD5-based password algorithm"},

#ifndef OPENSSL_NO_DES

    {"crypt", OPT_CRYPT, '-', "Standard Unix password algorithm (default)"},

#endif

    OPT_R_OPTIONS,

    {NULL}

};

int passwd_main(int argc, char **argv)

{

    BIO *in = NULL;

    char *infile = NULL, *salt = NULL, *passwd = NULL, **passwds = NULL;

    char *salt_malloc = NULL, *passwd_malloc = NULL, *prog;

    OPTION_CHOICE o;

    int in_stdin = 0, pw_source_defined = 0;

#ifndef OPENSSL_NO_UI_CONSOLE

    int in_noverify = 0;

#endif

    int passed_salt = 0, quiet = 0, table = 0, reverse = 0;

    int ret = 1;

    passwd_modes mode = passwd_unset;

    size_t passwd_malloc_size = 0;

    size_t pw_maxlen = 256; /* arbitrary limit, should be enough for most

                             * passwords */

    prog = opt_init(argc, argv, passwd_options);

    while ((o = opt_next()) != OPT_EOF) {

        switch (o) {

        case OPT_EOF:

        case OPT_ERR:

 opthelp:

            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);

            goto end;

        case OPT_HELP:

            opt_help(passwd_options);

            ret = 0;

            goto end;

        case OPT_IN:

            if (pw_source_defined)

                goto opthelp;

            infile = opt_arg();

            pw_source_defined = 1;

            break;

        case OPT_NOVERIFY:

#ifndef OPENSSL_NO_UI_CONSOLE

            in_noverify = 1;

#endif

            break;

        case OPT_QUIET:

            quiet = 1;

            break;

        case OPT_TABLE:

            table = 1;

            break;

        case OPT_REVERSE:

            reverse = 1;

            break;

        case OPT_1:

            if (mode != passwd_unset)

                goto opthelp;

            mode = passwd_md5;

            break;

        case OPT_5:

            if (mode != passwd_unset)

                goto opthelp;

            mode = passwd_sha256;

            break;

        case OPT_6:

            if (mode != passwd_unset)

                goto opthelp;

            mode = passwd_sha512;

            break;

        case OPT_APR1:

            if (mode != passwd_unset)

                goto opthelp;

            mode = passwd_apr1;

            break;

        case OPT_AIXMD5:

            if (mode != passwd_unset)

                goto opthelp;

            mode = passwd_aixmd5;

            break;

        case OPT_CRYPT:

#ifndef OPENSSL_NO_DES

            if (mode != passwd_unset)

                goto opthelp;

            mode = passwd_crypt;

#endif

            break;

        case OPT_SALT:

            passed_salt = 1;

            salt = opt_arg();

            break;

        case OPT_STDIN:

            if (pw_source_defined)

                goto opthelp;

            in_stdin = 1;

            pw_source_defined = 1;

            break;

        case OPT_R_CASES:

            if (!opt_rand(o))

                goto end;

            break;

        }

    }

    argc = opt_num_rest();

    argv = opt_rest();

    if (*argv != NULL) {

        if (pw_source_defined)

            goto opthelp;

        pw_source_defined = 1;

        passwds = argv;

    }

    if (mode == passwd_unset) {

        /* use default */

        mode = passwd_crypt;

    }

#ifdef OPENSSL_NO_DES

    if (mode == passwd_crypt)

        goto opthelp;

#endif

    if (infile != NULL && in_stdin) {

        BIO_printf(bio_err, "%s: Can't combine -in and -stdin\n", prog);

        goto end;

    }

    if (infile != NULL || in_stdin) {

        /*

         * If in_stdin is true, we know that infile is NULL, and that

         * bio_open_default() will give us back an alias for stdin.

         */

        in = bio_open_default(infile, 'r', FORMAT_TEXT);

        if (in == NULL)

            goto end;

    }

    if (mode == passwd_crypt)

        pw_maxlen = 8;

    if (passwds == NULL) {

        /* no passwords on the command line */

        passwd_malloc_size = pw_maxlen + 2;

        /* longer than necessary so that we can warn about truncation */

        passwd = passwd_malloc =

            app_malloc(passwd_malloc_size, "password buffer");

    }

    if ((in == NULL) && (passwds == NULL)) {

        /*

         * we use the following method to make sure what

         * in the 'else' section is always compiled, to

         * avoid rot of not-frequently-used code.

         */

        if (1) {

#ifndef OPENSSL_NO_UI_CONSOLE

            /* build a null-terminated list */

            static char *passwds_static[2] = { NULL, NULL };

            passwds = passwds_static;

            if (in == NULL) {

                if (EVP_read_pw_string

                    (passwd_malloc, passwd_malloc_size, "Password: ",

                     !(passed_salt || in_noverify)) != 0)

                    goto end;

            }

            passwds[0] = passwd_malloc;

        } else {

#endif

            BIO_printf(bio_err, "password required\n");

            goto end;

        }

    }

    if (in == NULL) {

        assert(passwds != NULL);

        assert(*passwds != NULL);

        do {                    /* loop over list of passwords */

            passwd = *passwds++;

            if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, bio_out,

                           quiet, table, reverse, pw_maxlen, mode))

                goto end;

        } while (*passwds != NULL);

    } else {

        /* in != NULL */

        int done;

        assert(passwd != NULL);

        do {

            int r = BIO_gets(in, passwd, pw_maxlen + 1);

            if (r > 0) {

                char *c = (strchr(passwd, '\n'));

                if (c != NULL) {

                    *c = 0;     /* truncate at newline */

                } else {

                    /* ignore rest of line */

                    char trash[BUFSIZ];

                    do

                        r = BIO_gets(in, trash, sizeof(trash));

                    while ((r > 0) && (!strchr(trash, '\n')));

                }

                if (!do_passwd

                    (passed_salt, &salt, &salt_malloc, passwd, bio_out, quiet,

                     table, reverse, pw_maxlen, mode))

                    goto end;

            }

            done = (r <= 0);

        } while (!done);

    }

    ret = 0;

 end:

#if 0

    ERR_print_errors(bio_err);

#endif

    OPENSSL_free(salt_malloc);

    OPENSSL_free(passwd_malloc);

    BIO_free(in);

    return ret;

}

/*

 * MD5-based password algorithm (should probably be available as a library

 * function; then the static buffer would not be acceptable). For magic

 * string "1", this should be compatible to the MD5-based BSD password

 * algorithm. For 'magic' string "apr1", this is compatible to the MD5-based

 * Apache password algorithm. (Apparently, the Apache password algorithm is

 * identical except that the 'magic' string was changed -- the laziest

 * application of the NIH principle I've ever encountered.)

 */

static char *md5crypt(const char *passwd, const char *magic, const char *salt)

{

    /* "$apr1$..salt..$.......md5hash..........\0" */

    static char out_buf[6 + 9 + 24 + 2];

    unsigned char buf[MD5_DIGEST_LENGTH];

    char ascii_magic[5];         /* "apr1" plus '\0' */

    char ascii_salt[9];          /* Max 8 chars plus '\0' */

    char *ascii_passwd = NULL;

    char *salt_out;

    int n;

    unsigned int i;

    EVP_MD_CTX *md = NULL, *md2 = NULL;

    size_t passwd_len, salt_len, magic_len;

    passwd_len = strlen(passwd);

    out_buf[0] = 0;

    magic_len = strlen(magic);

    OPENSSL_strlcpy(ascii_magic, magic, sizeof(ascii_magic));

#ifdef CHARSET_EBCDIC

    if ((magic[0] & 0x80) != 0)    /* High bit is 1 in EBCDIC alnums */

        ebcdic2ascii(ascii_magic, ascii_magic, magic_len);

#endif

    /* The salt gets truncated to 8 chars */

    OPENSSL_strlcpy(ascii_salt, salt, sizeof(ascii_salt));

    salt_len = strlen(ascii_salt);

#ifdef CHARSET_EBCDIC

    ebcdic2ascii(ascii_salt, ascii_salt, salt_len);

#endif

#ifdef CHARSET_EBCDIC

    ascii_passwd = OPENSSL_strdup(passwd);

    if (ascii_passwd == NULL)

        return NULL;

    ebcdic2ascii(ascii_passwd, ascii_passwd, passwd_len);

    passwd = ascii_passwd;

#endif

    if (magic_len > 0) {

        OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));

        if (magic_len > 4)    /* assert it's  "1" or "apr1" */

            goto err;

        OPENSSL_strlcat(out_buf, ascii_magic, sizeof(out_buf));

        OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));

    }

    OPENSSL_strlcat(out_buf, ascii_salt, sizeof(out_buf));

    if (strlen(out_buf) > 6 + 8) /* assert "$apr1$..salt.." */

        goto err;

    salt_out = out_buf;

    if (magic_len > 0)

        salt_out += 2 + magic_len;

    if (salt_len > 8)

        goto err;

    md = EVP_MD_CTX_new();

    if (md == NULL

        || !EVP_DigestInit_ex(md, EVP_md5(), NULL)

        || !EVP_DigestUpdate(md, passwd, passwd_len))

        goto err;

    if (magic_len > 0)

        if (!EVP_DigestUpdate(md, ascii_dollar, 1)

            || !EVP_DigestUpdate(md, ascii_magic, magic_len)

            || !EVP_DigestUpdate(md, ascii_dollar, 1))

          goto err;

    if (!EVP_DigestUpdate(md, ascii_salt, salt_len))

        goto err;

    md2 = EVP_MD_CTX_new();

    if (md2 == NULL

        || !EVP_DigestInit_ex(md2, EVP_md5(), NULL)

        || !EVP_DigestUpdate(md2, passwd, passwd_len)

        || !EVP_DigestUpdate(md2, ascii_salt, salt_len)

        || !EVP_DigestUpdate(md2, passwd, passwd_len)

        || !EVP_DigestFinal_ex(md2, buf, NULL))

        goto err;

    for (i = passwd_len; i > sizeof(buf); i -= sizeof(buf)) {

        if (!EVP_DigestUpdate(md, buf, sizeof(buf)))

            goto err;

    }

    if (!EVP_DigestUpdate(md, buf, i))

        goto err;

    n = passwd_len;

    while (n) {

        if (!EVP_DigestUpdate(md, (n & 1) ? "\0" : passwd, 1))

            goto err;

        n >>= 1;

    }

    if (!EVP_DigestFinal_ex(md, buf, NULL))

        return NULL;

    for (i = 0; i < 1000; i++) {

        if (!EVP_DigestInit_ex(md2, EVP_md5(), NULL))

            goto err;

        if (!EVP_DigestUpdate(md2,

                              (i & 1) ? (unsigned const char *)passwd : buf,

                              (i & 1) ? passwd_len : sizeof(buf)))

            goto err;

        if (i % 3) {

            if (!EVP_DigestUpdate(md2, ascii_salt, salt_len))

                goto err;

        }

        if (i % 7) {

            if (!EVP_DigestUpdate(md2, passwd, passwd_len))

                goto err;

        }

        if (!EVP_DigestUpdate(md2,

                              (i & 1) ? buf : (unsigned const char *)passwd,

                              (i & 1) ? sizeof(buf) : passwd_len))

                goto err;

        if (!EVP_DigestFinal_ex(md2, buf, NULL))

                goto err;

    }

    EVP_MD_CTX_free(md2);

    EVP_MD_CTX_free(md);

    md2 = NULL;

    md = NULL;

    {

        /* transform buf into output string */

        unsigned char buf_perm[sizeof(buf)];

        int dest, source;

        char *output;

        /* silly output permutation */

        for (dest = 0, source = 0; dest < 14;

             dest++, source = (source + 6) % 17)

            buf_perm[dest] = buf[source];

        buf_perm[14] = buf[5];

        buf_perm[15] = buf[11];

# ifndef PEDANTIC              /* Unfortunately, this generates a "no

                                 * effect" warning */

        assert(16 == sizeof(buf_perm));

# endif

        output = salt_out + salt_len;

        assert(output == out_buf + strlen(out_buf));

        *output++ = ascii_dollar[0];

        for (i = 0; i < 15; i += 3) {

            *output++ = cov_2char[buf_perm[i + 2] & 0x3f];

            *output++ = cov_2char[((buf_perm[i + 1] & 0xf) << 2) |

                                  (buf_perm[i + 2] >> 6)];

            *output++ = cov_2char[((buf_perm[i] & 3) << 4) |

                                  (buf_perm[i + 1] >> 4)];

            *output++ = cov_2char[buf_perm[i] >> 2];

        }

        assert(i == 15);

        *output++ = cov_2char[buf_perm[i] & 0x3f];

        *output++ = cov_2char[buf_perm[i] >> 6];

        *output = 0;

        assert(strlen(out_buf) < sizeof(out_buf));

#ifdef CHARSET_EBCDIC

        ascii2ebcdic(out_buf, out_buf, strlen(out_buf));

#endif

    }

    return out_buf;

 err:

    OPENSSL_free(ascii_passwd);

    EVP_MD_CTX_free(md2);

    EVP_MD_CTX_free(md);

    return NULL;

}

/*

 * SHA based password algorithm, describe by Ulrich Drepper here:

 * https://www.akkadia.org/drepper/SHA-crypt.txt

 * (note that it's in the public domain)

 */

static char *shacrypt(const char *passwd, const char *magic, const char *salt)

{

    /* Prefix for optional rounds specification.  */

    static const char rounds_prefix[] = "rounds=";

    /* Maximum salt string length.  */

# define SALT_LEN_MAX 16

    /* Default number of rounds if not explicitly specified.  */

# define ROUNDS_DEFAULT 5000

    /* Minimum number of rounds.  */

# define ROUNDS_MIN 1000

    /* Maximum number of rounds.  */

# define ROUNDS_MAX 999999999

    /* "$6$rounds=<N>$......salt......$...shahash(up to 86 chars)...\0" */

    static char out_buf[3 + 17 + 17 + 86 + 1];

    unsigned char buf[SHA512_DIGEST_LENGTH];

    unsigned char temp_buf[SHA512_DIGEST_LENGTH];

    size_t buf_size = 0;

    char ascii_magic[2];

    char ascii_salt[17];          /* Max 16 chars plus '\0' */

    char *ascii_passwd = NULL;

    size_t n;

    EVP_MD_CTX *md = NULL, *md2 = NULL;

    const EVP_MD *sha = NULL;

    size_t passwd_len, salt_len, magic_len;

    unsigned int rounds = 5000;        /* Default */

    char rounds_custom = 0;

    char *p_bytes = NULL;

    char *s_bytes = NULL;

    char *cp = NULL;

    passwd_len = strlen(passwd);

    magic_len = strlen(magic);

    /* assert it's "5" or "6" */

    if (magic_len != 1)

        return NULL;

    switch (magic[0]) {

    case '5':

        sha = EVP_sha256();

        buf_size = 32;

        break;

    case '6':

        sha = EVP_sha512();

        buf_size = 64;

        break;

    default:

        return NULL;

    }

    if (strncmp(salt, rounds_prefix, sizeof(rounds_prefix) - 1) == 0) {

        const char *num = salt + sizeof(rounds_prefix) - 1;

        char *endp;

        unsigned long int srounds = strtoul (num, &endp, 10);

        if (*endp == '$') {

            salt = endp + 1;

            if (srounds > ROUNDS_MAX)

                rounds = ROUNDS_MAX;

            else if (srounds < ROUNDS_MIN)

                rounds = ROUNDS_MIN;

            else

                rounds = (unsigned int)srounds;

            rounds_custom = 1;

        } else {

            return NULL;

        }

    }

    OPENSSL_strlcpy(ascii_magic, magic, sizeof(ascii_magic));

#ifdef CHARSET_EBCDIC

    if ((magic[0] & 0x80) != 0)    /* High bit is 1 in EBCDIC alnums */

        ebcdic2ascii(ascii_magic, ascii_magic, magic_len);

#endif

    /* The salt gets truncated to 16 chars */

    OPENSSL_strlcpy(ascii_salt, salt, sizeof(ascii_salt));

    salt_len = strlen(ascii_salt);

#ifdef CHARSET_EBCDIC

    ebcdic2ascii(ascii_salt, ascii_salt, salt_len);

#endif

#ifdef CHARSET_EBCDIC

    ascii_passwd = OPENSSL_strdup(passwd);

    if (ascii_passwd == NULL)

        return NULL;

    ebcdic2ascii(ascii_passwd, ascii_passwd, passwd_len);

    passwd = ascii_passwd;

#endif

    out_buf[0] = 0;

    OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));

    OPENSSL_strlcat(out_buf, ascii_magic, sizeof(out_buf));

    OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));

    if (rounds_custom) {

        char tmp_buf[80]; /* "rounds=999999999" */

        sprintf(tmp_buf, "rounds=%u", rounds);

#ifdef CHARSET_EBCDIC

        /* In case we're really on a ASCII based platform and just pretend */

        if (tmp_buf[0] != 0x72)  /* ASCII 'r' */

            ebcdic2ascii(tmp_buf, tmp_buf, strlen(tmp_buf));

#endif

        OPENSSL_strlcat(out_buf, tmp_buf, sizeof(out_buf));

        OPENSSL_strlcat(out_buf, ascii_dollar, sizeof(out_buf));

    }

    OPENSSL_strlcat(out_buf, ascii_salt, sizeof(out_buf));

    /* assert "$5$rounds=999999999$......salt......" */

    if (strlen(out_buf) > 3 + 17 * rounds_custom + salt_len )

        goto err;

    md = EVP_MD_CTX_new();

    if (md == NULL

        || !EVP_DigestInit_ex(md, sha, NULL)

        || !EVP_DigestUpdate(md, passwd, passwd_len)

        || !EVP_DigestUpdate(md, ascii_salt, salt_len))

        goto err;

    md2 = EVP_MD_CTX_new();

    if (md2 == NULL

        || !EVP_DigestInit_ex(md2, sha, NULL)

        || !EVP_DigestUpdate(md2, passwd, passwd_len)

        || !EVP_DigestUpdate(md2, ascii_salt, salt_len)

        || !EVP_DigestUpdate(md2, passwd, passwd_len)

        || !EVP_DigestFinal_ex(md2, buf, NULL))

        goto err;

    for (n = passwd_len; n > buf_size; n -= buf_size) {

        if (!EVP_DigestUpdate(md, buf, buf_size))

            goto err;

    }

    if (!EVP_DigestUpdate(md, buf, n))

        goto err;

    n = passwd_len;

    while (n) {

        if (!EVP_DigestUpdate(md,

                              (n & 1) ? buf : (unsigned const char *)passwd,

                              (n & 1) ? buf_size : passwd_len))

            goto err;

        n >>= 1;

    }

    if (!EVP_DigestFinal_ex(md, buf, NULL))

        return NULL;

    /* P sequence */

    if (!EVP_DigestInit_ex(md2, sha, NULL))

        goto err;

    for (n = passwd_len; n > 0; n--)

        if (!EVP_DigestUpdate(md2, passwd, passwd_len))

            goto err;

    if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))

        return NULL;

    if ((p_bytes = OPENSSL_zalloc(passwd_len)) == NULL)

        goto err;

    for (cp = p_bytes, n = passwd_len; n > buf_size; n -= buf_size, cp += buf_size)

        memcpy(cp, temp_buf, buf_size);

    memcpy(cp, temp_buf, n);

    /* S sequence */

    if (!EVP_DigestInit_ex(md2, sha, NULL))

        goto err;

    for (n = 16 + buf[0]; n > 0; n--)

        if (!EVP_DigestUpdate(md2, ascii_salt, salt_len))

            goto err;

    if (!EVP_DigestFinal_ex(md2, temp_buf, NULL))

        return NULL;

    if ((s_bytes = OPENSSL_zalloc(salt_len)) == NULL)

        goto err;

    for (cp = s_bytes, n = salt_len; n > buf_size; n -= buf_size, cp += buf_size)

        memcpy(cp, temp_buf, buf_size);

    memcpy(cp, temp_buf, n);

    for (n = 0; n < rounds; n++) {

        if (!EVP_DigestInit_ex(md2, sha, NULL))

            goto err;

        if (!EVP_DigestUpdate(md2,

                              (n & 1) ? (unsigned const char *)p_bytes : buf,

                              (n & 1) ? passwd_len : buf_size))

            goto err;

        if (n % 3) {

            if (!EVP_DigestUpdate(md2, s_bytes, salt_len))

                goto err;

        }

        if (n % 7) {

            if (!EVP_DigestUpdate(md2, p_bytes, passwd_len))

                goto err;

        }

        if (!EVP_DigestUpdate(md2,

                              (n & 1) ? buf : (unsigned const char *)p_bytes,

                              (n & 1) ? buf_size : passwd_len))

                goto err;

        if (!EVP_DigestFinal_ex(md2, buf, NULL))

                goto err;

    }

    EVP_MD_CTX_free(md2);

    EVP_MD_CTX_free(md);

    md2 = NULL;

    md = NULL;

    OPENSSL_free(p_bytes);

    OPENSSL_free(s_bytes);

    p_bytes = NULL;

    s_bytes = NULL;

    cp = out_buf + strlen(out_buf);

    *cp++ = ascii_dollar[0];

# define b64_from_24bit(B2, B1, B0, N)                                   \

    do {                                                                \

        unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0);             \

        int i = (N);                                                    \

        while (i-- > 0)                                                 \

            {                                                           \

                *cp++ = cov_2char[w & 0x3f];                            \

                w >>= 6;                                                \

            }                                                           \

    } while (0)

    switch (magic[0]) {

    case '5':

        b64_from_24bit (buf[0], buf[10], buf[20], 4);

        b64_from_24bit (buf[21], buf[1], buf[11], 4);

        b64_from_24bit (buf[12], buf[22], buf[2], 4);

        b64_from_24bit (buf[3], buf[13], buf[23], 4);

        b64_from_24bit (buf[24], buf[4], buf[14], 4);

        b64_from_24bit (buf[15], buf[25], buf[5], 4);

        b64_from_24bit (buf[6], buf[16], buf[26], 4);

        b64_from_24bit (buf[27], buf[7], buf[17], 4);

        b64_from_24bit (buf[18], buf[28], buf[8], 4);

        b64_from_24bit (buf[9], buf[19], buf[29], 4);

        b64_from_24bit (0, buf[31], buf[30], 3);

        break;

    case '6':

        b64_from_24bit (buf[0], buf[21], buf[42], 4);

        b64_from_24bit (buf[22], buf[43], buf[1], 4);

        b64_from_24bit (buf[44], buf[2], buf[23], 4);

        b64_from_24bit (buf[3], buf[24], buf[45], 4);

        b64_from_24bit (buf[25], buf[46], buf[4], 4);

        b64_from_24bit (buf[47], buf[5], buf[26], 4);

        b64_from_24bit (buf[6], buf[27], buf[48], 4);

        b64_from_24bit (buf[28], buf[49], buf[7], 4);

        b64_from_24bit (buf[50], buf[8], buf[29], 4);

        b64_from_24bit (buf[9], buf[30], buf[51], 4);

        b64_from_24bit (buf[31], buf[52], buf[10], 4);

        b64_from_24bit (buf[53], buf[11], buf[32], 4);

        b64_from_24bit (buf[12], buf[33], buf[54], 4);

        b64_from_24bit (buf[34], buf[55], buf[13], 4);

        b64_from_24bit (buf[56], buf[14], buf[35], 4);

        b64_from_24bit (buf[15], buf[36], buf[57], 4);

        b64_from_24bit (buf[37], buf[58], buf[16], 4);

        b64_from_24bit (buf[59], buf[17], buf[38], 4);

        b64_from_24bit (buf[18], buf[39], buf[60], 4);

        b64_from_24bit (buf[40], buf[61], buf[19], 4);

        b64_from_24bit (buf[62], buf[20], buf[41], 4);

        b64_from_24bit (0, 0, buf[63], 2);

        break;

    default:

        goto err;

    }

    *cp = '\0';

#ifdef CHARSET_EBCDIC

    ascii2ebcdic(out_buf, out_buf, strlen(out_buf));

#endif

    return out_buf;

 err:

    EVP_MD_CTX_free(md2);

    EVP_MD_CTX_free(md);

    OPENSSL_free(p_bytes);

    OPENSSL_free(s_bytes);

    OPENSSL_free(ascii_passwd);

    return NULL;

}

static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,

                     char *passwd, BIO *out, int quiet, int table,

                     int reverse, size_t pw_maxlen, passwd_modes mode)

{

    char *hash = NULL;

    assert(salt_p != NULL);

    assert(salt_malloc_p != NULL);

    /* first make sure we have a salt */

    if (!passed_salt) {

        size_t saltlen = 0;

        size_t i;

#ifndef OPENSSL_NO_DES

        if (mode == passwd_crypt)

            saltlen = 2;

#endif                         /* !OPENSSL_NO_DES */

        if (mode == passwd_md5 || mode == passwd_apr1 || mode == passwd_aixmd5)

            saltlen = 8;

        if (mode == passwd_sha256 || mode == passwd_sha512)

            saltlen = 16;

        assert(saltlen != 0);

        if (*salt_malloc_p == NULL)

            *salt_p = *salt_malloc_p = app_malloc(saltlen + 1, "salt buffer");

        if (RAND_bytes((unsigned char *)*salt_p, saltlen) <= 0)

            goto end;

        for (i = 0; i < saltlen; i++)

            (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */

        (*salt_p)[i] = 0;

# ifdef CHARSET_EBCDIC

        /* The password encryption function will convert back to ASCII */

        ascii2ebcdic(*salt_p, *salt_p, saltlen);

# endif

    }

    assert(*salt_p != NULL);

    /* truncate password if necessary */

    if ((strlen(passwd) > pw_maxlen)) {

        if (!quiet)

            /*

             * XXX: really we should know how to print a size_t, not cast it

             */

            BIO_printf(bio_err,

                       "Warning: truncating password to %u characters\n",

                       (unsigned)pw_maxlen);

        passwd[pw_maxlen] = 0;

    }

    assert(strlen(passwd) <= pw_maxlen);

    /* now compute password hash */

#ifndef OPENSSL_NO_DES

    if (mode == passwd_crypt)

        hash = DES_crypt(passwd, *salt_p);

#endif

    if (mode == passwd_md5 || mode == passwd_apr1)

        hash = md5crypt(passwd, (mode == passwd_md5 ? "1" : "apr1"), *salt_p);

    if (mode == passwd_aixmd5)

        hash = md5crypt(passwd, "", *salt_p);

    if (mode == passwd_sha256 || mode == passwd_sha512)

        hash = shacrypt(passwd, (mode == passwd_sha256 ? "5" : "6"), *salt_p);

    assert(hash != NULL);

    if (table && !reverse)

        BIO_printf(out, "%s\t%s\n", passwd, hash);

    else if (table && reverse)

        BIO_printf(out, "%s\t%s\n", hash, passwd);

    else

        BIO_printf(out, "%s\n", hash);

    return 1;

 end:

    return 0;

}