crypto/des/fcrypt.c

   1 /*
   2  * Copyright 1998-2016 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  */
  34 static unsigned const 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
  53 static unsigned const 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
  64 char *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
  97 char *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 }