1/*
2 * Copyright 1998-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/*
11 * DES low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14#include "internal/deprecated.h"
15
16/* NOCW */
17#include <stdio.h>
18#ifdef _OSD_POSIX
19# ifndef CHARSET_EBCDIC
20#  define CHARSET_EBCDIC 1
21# endif
22#endif
23#ifdef CHARSET_EBCDIC
24# include <openssl/ebcdic.h>
25#endif
26
27#include <openssl/crypto.h>
28#include "des_local.h"
29
30/*
31 * Added more values to handle illegal salt values the way normal crypt()
32 * implementations do.
33 */
34static const unsigned char con_salt[128] = {
35    0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9,
36    0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 0xE0, 0xE1,
37    0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9,
38    0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1,
39    0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9,
40    0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF, 0x00, 0x01,
41    0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
42    0x0A, 0x0B, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A,
43    0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12,
44    0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A,
45    0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22,
46    0x23, 0x24, 0x25, 0x20, 0x21, 0x22, 0x23, 0x24,
47    0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C,
48    0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34,
49    0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C,
50    0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44,
51};
52
53static const unsigned char cov_2char[64] = {
54    0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
55    0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
56    0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
57    0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
58    0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
59    0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
60    0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
61    0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
62};
63
64char *DES_crypt(const char *buf, const char *salt)
65{
66    static char buff[14];
67
68#ifndef CHARSET_EBCDIC
69    return DES_fcrypt(buf, salt, buff);
70#else
71    char e_salt[2 + 1];
72    char e_buf[32 + 1];         /* replace 32 by 8 ? */
73    char *ret;
74
75    if (salt[0] == '\0' || salt[1] == '\0')
76        return NULL;
77
78    /* Copy salt, convert to ASCII. */
79    e_salt[0] = salt[0];
80    e_salt[1] = salt[1];
81    e_salt[2] = '\0';
82    ebcdic2ascii(e_salt, e_salt, sizeof(e_salt));
83
84    /* Convert password to ASCII. */
85    OPENSSL_strlcpy(e_buf, buf, sizeof(e_buf));
86    ebcdic2ascii(e_buf, e_buf, sizeof(e_buf));
87
88    /* Encrypt it (from/to ASCII); if it worked, convert back. */
89    ret = DES_fcrypt(e_buf, e_salt, buff);
90    if (ret != NULL)
91        ascii2ebcdic(ret, ret, strlen(ret));
92
93    return ret;
94#endif
95}
96
97char *DES_fcrypt(const char *buf, const char *salt, char *ret)
98{
99    unsigned int i, j, x, y;
100    DES_LONG Eswap0, Eswap1;
101    DES_LONG out[2], ll;
102    DES_cblock key;
103    DES_key_schedule ks;
104    unsigned char bb[9];
105    unsigned char *b = bb;
106    unsigned char c, u;
107
108    x = ret[0] = salt[0];
109    if (x == 0 || x >= sizeof(con_salt))
110        return NULL;
111    Eswap0 = con_salt[x] << 2;
112    x = ret[1] = salt[1];
113    if (x == 0 || x >= sizeof(con_salt))
114        return NULL;
115    Eswap1 = con_salt[x] << 6;
116
117    /*
118     * EAY r=strlen(buf); r=(r+7)/8;
119     */
120    for (i = 0; i < 8; i++) {
121        c = *(buf++);
122        if (!c)
123            break;
124        key[i] = (c << 1);
125    }
126    for (; i < 8; i++)
127        key[i] = 0;
128
129    DES_set_key_unchecked(&key, &ks);
130    fcrypt_body(&(out[0]), &ks, Eswap0, Eswap1);
131
132    ll = out[0];
133    l2c(ll, b);
134    ll = out[1];
135    l2c(ll, b);
136    y = 0;
137    u = 0x80;
138    bb[8] = 0;
139    for (i = 2; i < 13; i++) {
140        c = 0;
141        for (j = 0; j < 6; j++) {
142            c <<= 1;
143            if (bb[y] & u)
144                c |= 1;
145            u >>= 1;
146            if (!u) {
147                y++;
148                u = 0x80;
149            }
150        }
151        ret[i] = cov_2char[c];
152    }
153    ret[13] = '\0';
154    return ret;
155}
156