2 * $Id: md5_crypt.c,v 1.1.1.1 2000/06/20 22:12:03 agmorgan Exp $
3 * $FreeBSD: src/contrib/libpam/modules/pam_unix/md5_crypt.c,v 1.1.1.1.2.2 2001/06/11 15:28:30 markm Exp $
4 * $DragonFly: src/contrib/libpam/modules/pam_unix/Attic/md5_crypt.c,v 1.2 2003/06/17 04:24:03 dillon Exp $
6 * ----------------------------------------------------------------------------
7 * "THE BEER-WARE LICENSE" (Revision 42):
8 * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
9 * can do whatever you want with this stuff. If we meet some day, and you think
10 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
11 * ----------------------------------------------------------------------------
13 * Origin: Id: crypt.c,v 1.3 1995/05/30 05:42:22 rgrimes Exp
20 static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
21 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
23 static void to64(char *s, unsigned long v, int n)
26 *s++ = itoa64[v & 0x3f];
34 * Use MD5 for what it is best at...
37 char *MD5Name(crypt_md5)(const char *pw, const char *salt)
39 const char *magic = "$1$";
40 /* This string is magic for this algorithm. Having
41 * it this way, we can get get better later on */
42 static char passwd[120], *p;
43 static const char *sp, *ep;
44 unsigned char final[16];
49 /* Refine the Salt first */
52 /* If it starts with the magic string, then skip that */
53 if (!strncmp(sp, magic, strlen(magic)))
56 /* It stops at the first '$', max 8 chars */
57 for (ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++)
60 /* get the length of the true salt */
63 MD5Name(MD5Init)(&ctx);
65 /* The password first, since that is what is most unknown */
66 MD5Name(MD5Update)(&ctx,(unsigned const char *)pw,strlen(pw));
68 /* Then our magic string */
69 MD5Name(MD5Update)(&ctx,(unsigned const char *)magic,strlen(magic));
71 /* Then the raw salt */
72 MD5Name(MD5Update)(&ctx,(unsigned const char *)sp,sl);
74 /* Then just as many characters of the MD5(pw,salt,pw) */
75 MD5Name(MD5Init)(&ctx1);
76 MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw));
77 MD5Name(MD5Update)(&ctx1,(unsigned const char *)sp,sl);
78 MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw));
79 MD5Name(MD5Final)(final,&ctx1);
80 for (pl = strlen(pw); pl > 0; pl -= 16)
81 MD5Name(MD5Update)(&ctx,(unsigned const char *)final,pl>16 ? 16 : pl);
83 /* Don't leave anything around in vm they could use. */
84 memset(final, 0, sizeof final);
86 /* Then something really weird... */
87 for (j = 0, i = strlen(pw); i; i >>= 1)
89 MD5Name(MD5Update)(&ctx, (unsigned const char *)final+j, 1);
91 MD5Name(MD5Update)(&ctx, (unsigned const char *)pw+j, 1);
93 /* Now make the output string */
94 strcpy(passwd, magic);
95 strncat(passwd, sp, sl);
98 MD5Name(MD5Final)(final,&ctx);
101 * and now, just to make sure things don't run too fast
102 * On a 60 Mhz Pentium this takes 34 msec, so you would
103 * need 30 seconds to build a 1000 entry dictionary...
105 for (i = 0; i < 1000; i++) {
106 MD5Name(MD5Init)(&ctx1);
108 MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw));
110 MD5Name(MD5Update)(&ctx1,(unsigned const char *)final,16);
113 MD5Name(MD5Update)(&ctx1,(unsigned const char *)sp,sl);
116 MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw));
119 MD5Name(MD5Update)(&ctx1,(unsigned const char *)final,16);
121 MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw));
122 MD5Name(MD5Final)(final,&ctx1);
125 p = passwd + strlen(passwd);
127 l = (final[0] << 16) | (final[6] << 8) | final[12];
130 l = (final[1] << 16) | (final[7] << 8) | final[13];
133 l = (final[2] << 16) | (final[8] << 8) | final[14];
136 l = (final[3] << 16) | (final[9] << 8) | final[15];
139 l = (final[4] << 16) | (final[10] << 8) | final[5];
147 /* Don't leave anything around in vm they could use. */
148 memset(final, 0, sizeof final);