/*

 * Copyright 1998-2021 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (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

 */

/*

 * DES low level APIs are deprecated for public use, but still ok for internal

 * use.

 */

#include "internal/deprecated.h"

/* NOCW */

#include <stdio.h>

#ifdef _OSD_POSIX

# ifndef CHARSET_EBCDIC

#  define CHARSET_EBCDIC 1

# endif

#endif

#ifdef CHARSET_EBCDIC

# include <openssl/ebcdic.h>

#endif

#include <openssl/crypto.h>

#include "des_local.h"

/*

 * Added more values to handle illegal salt values the way normal crypt()

 * implementations do.

 */

static const unsigned char con_salt[128] = {

    0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9,

    0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 0xE0, 0xE1,

    0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9,

    0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1,

    0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9,

    0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF, 0x00, 0x01,

    0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,

    0x0A, 0x0B, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A,

    0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12,

    0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A,

    0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22,

    0x23, 0x24, 0x25, 0x20, 0x21, 0x22, 0x23, 0x24,

    0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C,

    0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34,

    0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C,

    0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44,

};

static const unsigned char cov_2char[64] = {

    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

};

char *DES_crypt(const char *buf, const char *salt)

{

    static char buff[14];

#ifndef CHARSET_EBCDIC

    return DES_fcrypt(buf, salt, buff);

#else

    char e_salt[2 + 1];

    char e_buf[32 + 1];         /* replace 32 by 8 ? */

    char *ret;

    if (salt[0] == '\0' || salt[1] == '\0')

        return NULL;

    /* Copy salt, convert to ASCII. */

    e_salt[0] = salt[0];

    e_salt[1] = salt[1];

    e_salt[2] = '\0';

    ebcdic2ascii(e_salt, e_salt, sizeof(e_salt));

    /* Convert password to ASCII. */

    OPENSSL_strlcpy(e_buf, buf, sizeof(e_buf));

    ebcdic2ascii(e_buf, e_buf, sizeof(e_buf));

    /* Encrypt it (from/to ASCII); if it worked, convert back. */

    ret = DES_fcrypt(e_buf, e_salt, buff);

    if (ret != NULL)

        ascii2ebcdic(ret, ret, strlen(ret));

    return ret;

#endif

}

char *DES_fcrypt(const char *buf, const char *salt, char *ret)

{

    unsigned int i, j, x, y;

    DES_LONG Eswap0, Eswap1;

    DES_LONG out[2], ll;

    DES_cblock key;

    DES_key_schedule ks;

    unsigned char bb[9];

    unsigned char *b = bb;

    unsigned char c, u;

    x = ret[0] = salt[0];

    if (x == 0 || x >= sizeof(con_salt))

        return NULL;

    Eswap0 = con_salt[x] << 2;

    x = ret[1] = salt[1];

    if (x == 0 || x >= sizeof(con_salt))

        return NULL;

    Eswap1 = con_salt[x] << 6;

    /*

     * EAY r=strlen(buf); r=(r+7)/8;

     */

    for (i = 0; i < 8; i++) {

        c = *(buf++);

        if (!c)

            break;

        key[i] = (c << 1);

    }

    for (; i < 8; i++)

        key[i] = 0;

    DES_set_key_unchecked(&key, &ks);

    fcrypt_body(&(out[0]), &ks, Eswap0, Eswap1);

    ll = out[0];

    l2c(ll, b);

    ll = out[1];

    l2c(ll, b);

    y = 0;

    u = 0x80;

    bb[8] = 0;

    for (i = 2; i < 13; i++) {

        c = 0;

        for (j = 0; j < 6; j++) {

            c <<= 1;

            if (bb[y] & u)

                c |= 1;

            u >>= 1;

            if (!u) {

                y++;

                u = 0x80;

            }

        }

        ret[i] = cov_2char[c];

    }

    ret[13] = '\0';

    return ret;

}