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[openssl.git] / crypto / des / fcrypt.c
1 /* NOCW */
2 #include <stdio.h>
3
4 /* This version of crypt has been developed from my MIT compatable
5  * DES library.
6  * The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au
7  * Eric Young (eay@cryptsoft.com)
8  */
9
10 /* Modification by Jens Kupferschmidt (Cu)
11  * I have included directive PARA for shared memory computers.
12  * I have included a directive LONGCRYPT to using this routine to cipher
13  * passwords with more then 8 bytes like HP-UX 10.x it used. The MAXPLEN
14  * definition is the maximum of lenght of password and can changed. I have
15  * defined 24.
16  */
17
18 #include "des_locl.h"
19
20 /* Added more values to handle illegal salt values the way normal
21  * crypt() implementations do.  The patch was sent by 
22  * Bjorn Gronvall <bg@sics.se>
23  */
24 static unsigned const char con_salt[128]={
25 0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,
26 0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,0xE0,0xE1,
27 0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,
28 0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,
29 0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,
30 0xFA,0xFB,0xFC,0xFD,0xFE,0xFF,0x00,0x01,
31 0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,
32 0x0A,0x0B,0x05,0x06,0x07,0x08,0x09,0x0A,
33 0x0B,0x0C,0x0D,0x0E,0x0F,0x10,0x11,0x12,
34 0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,
35 0x1B,0x1C,0x1D,0x1E,0x1F,0x20,0x21,0x22,
36 0x23,0x24,0x25,0x20,0x21,0x22,0x23,0x24,
37 0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,
38 0x2D,0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,
39 0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,
40 0x3D,0x3E,0x3F,0x40,0x41,0x42,0x43,0x44,
41 };
42
43 static unsigned const char cov_2char[64]={
44 0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,0x35,
45 0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,
46 0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,
47 0x4D,0x4E,0x4F,0x50,0x51,0x52,0x53,0x54,
48 0x55,0x56,0x57,0x58,0x59,0x5A,0x61,0x62,
49 0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,
50 0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,
51 0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A
52 };
53
54 #ifndef NOPROTO
55 void fcrypt_body(DES_LONG *out,des_key_schedule ks,
56         DES_LONG Eswap0, DES_LONG Eswap1);
57
58 #ifdef PERL5
59 char *des_crypt(const char *buf,const char *salt);
60 #else
61 char *crypt(const char *buf,const char *salt);
62 #endif
63 #else
64 void fcrypt_body();
65 #ifdef PERL5
66 char *des_crypt();
67 #else
68 char *crypt();
69 #endif
70 #endif
71
72 #ifdef PERL5
73 char *des_crypt(buf,salt)
74 #else
75 char *crypt(buf,salt)
76 #endif
77 const char *buf;
78 const char *salt;
79         {
80         static char buff[14];
81
82         return(des_fcrypt(buf,salt,buff));
83         }
84
85
86 char *des_fcrypt(buf,salt,ret)
87 const char *buf;
88 const char *salt;
89 char *ret;
90         {
91         unsigned int i,j,x,y;
92         DES_LONG Eswap0,Eswap1;
93         DES_LONG out[2],ll;
94         des_cblock key;
95         des_key_schedule ks;
96         unsigned char bb[9];
97         unsigned char *b=bb;
98         unsigned char c,u;
99
100         /* eay 25/08/92
101          * If you call crypt("pwd","*") as often happens when you
102          * have * as the pwd field in /etc/passwd, the function
103          * returns *\0XXXXXXXXX
104          * The \0 makes the string look like * so the pwd "*" would
105          * crypt to "*".  This was found when replacing the crypt in
106          * our shared libraries.  People found that the disbled
107          * accounts effectivly had no passwd :-(. */
108         x=ret[0]=((salt[0] == '\0')?'A':salt[0]);
109         Eswap0=con_salt[x]<<2;
110         x=ret[1]=((salt[1] == '\0')?'A':salt[1]);
111         Eswap1=con_salt[x]<<6;
112
113 /* EAY
114 r=strlen(buf);
115 r=(r+7)/8;
116 */
117         for (i=0; i<8; i++)
118                 {
119                 c= *(buf++);
120                 if (!c) break;
121                 key[i]=(c<<1);
122                 }
123         for (; i<8; i++)
124                 key[i]=0;
125
126         des_set_key((des_cblock *)(key),ks);
127         fcrypt_body(&(out[0]),ks,Eswap0,Eswap1);
128
129         ll=out[0]; l2c(ll,b);
130         ll=out[1]; l2c(ll,b);
131         y=0;
132         u=0x80;
133         bb[8]=0;
134         for (i=2; i<13; i++)
135                 {
136                 c=0;
137                 for (j=0; j<6; j++)
138                         {
139                         c<<=1;
140                         if (bb[y] & u) c|=1;
141                         u>>=1;
142                         if (!u)
143                                 {
144                                 y++;
145                                 u=0x80;
146                                 }
147                         }
148                 ret[i]=cov_2char[c];
149                 }
150         ret[13]='\0';
151         return(ret);
152         }
153