fcrypt.c revision 296465 
1/* NOCW */
2#include <stdio.h>
3#ifdef _OSD_POSIX
4# ifndef CHARSET_EBCDIC
5#  define CHARSET_EBCDIC 1
6# endif
7#endif
8#ifdef CHARSET_EBCDIC
9# include <openssl/ebcdic.h>
10#endif
11
12/*
13 * This version of crypt has been developed from my MIT compatible DES
14 * library. Eric Young (eay@cryptsoft.com)
15 */
16
17/*
18 * Modification by Jens Kupferschmidt (Cu) I have included directive PARA for
19 * shared memory computers. I have included a directive LONGCRYPT to using
20 * this routine to cipher passwords with more then 8 bytes like HP-UX 10.x it
21 * used. The MAXPLEN definition is the maximum of length of password and can
22 * changed. I have defined 24.
23 */
24
25#include "des_locl.h"
26
27/*
28 * Added more values to handle illegal salt values the way normal crypt()
29 * implementations do.  The patch was sent by Bjorn Gronvall <bg@sics.se>
30 */
31static unsigned const char con_salt[128] = {
32    0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9,
33    0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 0xE0, 0xE1,
34    0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9,
35    0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1,
36    0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9,
37    0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF, 0x00, 0x01,
38    0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
39    0x0A, 0x0B, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A,
40    0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12,
41    0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A,
42    0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22,
43    0x23, 0x24, 0x25, 0x20, 0x21, 0x22, 0x23, 0x24,
44    0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C,
45    0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34,
46    0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C,
47    0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44,
48};
49
50static unsigned const char cov_2char[64] = {
51    0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
52    0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
53    0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
54    0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
55    0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
56    0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
57    0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
58    0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
59};
60
61char *DES_crypt(const char *buf, const char *salt)
62{
63    static char buff[14];
64
65#ifndef CHARSET_EBCDIC
66    return (DES_fcrypt(buf, salt, buff));
67#else
68    char e_salt[2 + 1];
69    char e_buf[32 + 1];         /* replace 32 by 8 ? */
70    char *ret;
71
72    /* Copy at most 2 chars of salt */
73    if ((e_salt[0] = salt[0]) != '\0')
74        e_salt[1] = salt[1];
75
76    /* Copy at most 32 chars of password */
77    strncpy(e_buf, buf, sizeof(e_buf));
78
79    /* Make sure we have a delimiter */
80    e_salt[sizeof(e_salt) - 1] = e_buf[sizeof(e_buf) - 1] = '\0';
81
82    /* Convert the e_salt to ASCII, as that's what DES_fcrypt works on */
83    ebcdic2ascii(e_salt, e_salt, sizeof e_salt);
84
85    /* Convert the cleartext password to ASCII */
86    ebcdic2ascii(e_buf, e_buf, sizeof e_buf);
87
88    /* Encrypt it (from/to ASCII) */
89    ret = DES_fcrypt(e_buf, e_salt, buff);
90
91    /* Convert the result back to EBCDIC */
92    ascii2ebcdic(ret, ret, strlen(ret));
93
94    return ret;
95#endif
96}
97
98char *DES_fcrypt(const char *buf, const char *salt, char *ret)
99{
100    unsigned int i, j, x, y;
101    DES_LONG Eswap0, Eswap1;
102    DES_LONG out[2], ll;
103    DES_cblock key;
104    DES_key_schedule ks;
105    unsigned char bb[9];
106    unsigned char *b = bb;
107    unsigned char c, u;
108
109    /*
110     * eay 25/08/92 If you call crypt("pwd","*") as often happens when you
111     * have * as the pwd field in /etc/passwd, the function returns
112     * *\0XXXXXXXXX The \0 makes the string look like * so the pwd "*" would
113     * crypt to "*".  This was found when replacing the crypt in our shared
114     * libraries.  People found that the disabled accounts effectively had no
115     * passwd :-(.
116     */
117#ifndef CHARSET_EBCDIC
118    x = ret[0] = ((salt[0] == '\0') ? 'A' : salt[0]);
119    Eswap0 = con_salt[x] << 2;
120    x = ret[1] = ((salt[1] == '\0') ? 'A' : salt[1]);
121    Eswap1 = con_salt[x] << 6;
122#else
123    x = ret[0] = ((salt[0] == '\0') ? os_toascii['A'] : salt[0]);
124    Eswap0 = con_salt[x] << 2;
125    x = ret[1] = ((salt[1] == '\0') ? os_toascii['A'] : salt[1]);
126    Eswap1 = con_salt[x] << 6;
127#endif
128
129    /*
130     * EAY r=strlen(buf); r=(r+7)/8;
131     */
132    for (i = 0; i < 8; i++) {
133        c = *(buf++);
134        if (!c)
135            break;
136        key[i] = (c << 1);
137    }
138    for (; i < 8; i++)
139        key[i] = 0;
140
141    DES_set_key_unchecked(&key, &ks);
142    fcrypt_body(&(out[0]), &ks, Eswap0, Eswap1);
143
144    ll = out[0];
145    l2c(ll, b);
146    ll = out[1];
147    l2c(ll, b);
148    y = 0;
149    u = 0x80;
150    bb[8] = 0;
151    for (i = 2; i < 13; i++) {
152        c = 0;
153        for (j = 0; j < 6; j++) {
154            c <<= 1;
155            if (bb[y] & u)
156                c |= 1;
157            u >>= 1;
158            if (!u) {
159                y++;
160                u = 0x80;
161            }
162        }
163        ret[i] = cov_2char[c];
164    }
165    ret[13] = '\0';
166    return (ret);
167}
168