summaryrefslogtreecommitdiff
path: root/md5crypt.c
diff options
context:
space:
mode:
Diffstat (limited to 'md5crypt.c')
-rw-r--r--md5crypt.c162
1 files changed, 78 insertions, 84 deletions
diff --git a/md5crypt.c b/md5crypt.c
index e14d53ac1..ba98ccccc 100644
--- a/md5crypt.c
+++ b/md5crypt.c
@@ -1,165 +1,159 @@
1/* 1/*
2 * ---------------------------------------------------------------------------- 2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42): 3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@login.dknet.dk> wrote this file. As long as you retain this 4 * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
5 * notice you can do whatever you want with this stuff. If we meet some 5 * can do whatever you want with this stuff. If we meet some day, and you think
6 * day, and you think this stuff is worth it, you can buy me a beer in 6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
7 * return. Poul-Henning Kamp
8 * ---------------------------------------------------------------------------- 7 * ----------------------------------------------------------------------------
9 */ 8 */
10 9
10/*
11 * Ported from FreeBSD to Linux, only minimal changes. --marekm
12 */
13
14/*
15 * Adapted from shadow-19990607 by Tudor Bosman, tudorb@jm.nu
16 */
17
11#include "includes.h" 18#include "includes.h"
12 19
20RCSID("$Id: md5crypt.c,v 1.5 2001/02/09 01:55:36 djm Exp $");
21
13#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) 22#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
14#include <openssl/md5.h>
15 23
16RCSID("$Id: md5crypt.c,v 1.7 2003/05/30 06:58:23 dtucker Exp $"); 24#include <openssl/md5.h>
17 25
18/* 0 ... 63 => ascii - 64 */ 26static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
19static unsigned char itoa64[] = 27 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
20 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
21 28
22static char *magic = "$1$"; 29static char *magic = "$1$"; /*
30 * This string is magic for
31 * this algorithm. Having
32 * it this way, we can get
33 * get better later on
34 */
23 35
24static char * 36static void
25to64(unsigned long v, int n) 37to64(char *s, unsigned long v, int n)
26{ 38{
27 static char buf[5];
28 char *s = buf;
29
30 if (n > 4)
31 return (NULL);
32
33 memset(buf, '\0', sizeof(buf));
34 while (--n >= 0) { 39 while (--n >= 0) {
35 *s++ = itoa64[v&0x3f]; 40 *s++ = itoa64[v&0x3f];
36 v >>= 6; 41 v >>= 6;
37 } 42 }
38
39 return (buf);
40} 43}
41 44
42int 45int
43is_md5_salt(const char *salt) 46is_md5_salt(const char *salt)
44{ 47{
45 return (strncmp(salt, magic, strlen(magic)) == 0); 48 return (!strncmp(salt, magic, strlen(magic)));
46} 49}
47 50
51/*
52 * UNIX password
53 *
54 * Use MD5 for what it is best at...
55 */
56
48char * 57char *
49md5_crypt(const char *pw, const char *salt) 58md5_crypt(const char *pw, const char *salt)
50{ 59{
51 static char passwd[120], salt_copy[9], *p; 60 static char passwd[120], *p;
52 static const char *sp, *ep; 61 static const char *sp,*ep;
53 unsigned char final[16]; 62 unsigned char final[16];
54 int sl, pl, i, j; 63 int sl,pl,i,j;
55 MD5_CTX ctx, ctx1; 64 MD5_CTX ctx,ctx1;
56 unsigned long l; 65 unsigned long l;
57 66
58 /* Refine the Salt first */ 67 /* Refine the Salt first */
59 sp = salt; 68 sp = salt;
60 69
61 /* If it starts with the magic string, then skip that */ 70 /* If it starts with the magic string, then skip that */
62 if(strncmp(sp, magic, strlen(magic)) == 0) 71 if(!strncmp(sp,magic,strlen(magic)))
63 sp += strlen(magic); 72 sp += strlen(magic);
64 73
65 /* It stops at the first '$', max 8 chars */ 74 /* It stops at the first '$', max 8 chars */
66 for (ep = sp; *ep != '$'; ep++) { 75 for(ep=sp;*ep && *ep != '$' && ep < (sp+8);ep++)
67 if (*ep == '\0' || ep >= (sp + 8)) 76 continue;
68 return (NULL);
69 }
70 77
71 /* get the length of the true salt */ 78 /* get the length of the true salt */
72 sl = ep - sp; 79 sl = ep - sp;
73 80
74 /* Stash the salt */
75 memcpy(salt_copy, sp, sl);
76 salt_copy[sl] = '\0';
77
78 MD5_Init(&ctx); 81 MD5_Init(&ctx);
79 82
80 /* The password first, since that is what is most unknown */ 83 /* The password first, since that is what is most unknown */
81 MD5_Update(&ctx, pw, strlen(pw)); 84 MD5_Update(&ctx,pw,strlen(pw));
82 85
83 /* Then our magic string */ 86 /* Then our magic string */
84 MD5_Update(&ctx, magic, strlen(magic)); 87 MD5_Update(&ctx,magic,strlen(magic));
85 88
86 /* Then the raw salt */ 89 /* Then the raw salt */
87 MD5_Update(&ctx, sp, sl); 90 MD5_Update(&ctx,sp,sl);
88 91
89 /* Then just as many characters of the MD5(pw, salt, pw) */ 92 /* Then just as many characters of the MD5(pw,salt,pw) */
90 MD5_Init(&ctx1); 93 MD5_Init(&ctx1);
91 MD5_Update(&ctx1, pw, strlen(pw)); 94 MD5_Update(&ctx1,pw,strlen(pw));
92 MD5_Update(&ctx1, sp, sl); 95 MD5_Update(&ctx1,sp,sl);
93 MD5_Update(&ctx1, pw, strlen(pw)); 96 MD5_Update(&ctx1,pw,strlen(pw));
94 MD5_Final(final, &ctx1); 97 MD5_Final(final,&ctx1);
95
96 for(pl = strlen(pw); pl > 0; pl -= 16) 98 for(pl = strlen(pw); pl > 0; pl -= 16)
97 MD5_Update(&ctx, final, pl > 16 ? 16 : pl); 99 MD5_Update(&ctx,final,pl>16 ? 16 : pl);
98 100
99 /* Don't leave anything around in vm they could use. */ 101 /* Don't leave anything around in vm they could use. */
100 memset(final, '\0', sizeof final); 102 memset(final,0,sizeof final);
101 103
102 /* Then something really weird... */ 104 /* Then something really weird... */
103 for (j = 0, i = strlen(pw); i != 0; i >>= 1) 105 for (j=0,i = strlen(pw); i ; i >>= 1)
104 if (i & 1) 106 if(i&1)
105 MD5_Update(&ctx, final + j, 1); 107 MD5_Update(&ctx, final+j, 1);
106 else 108 else
107 MD5_Update(&ctx, pw + j, 1); 109 MD5_Update(&ctx, pw+j, 1);
108 110
109 /* Now make the output string */ 111 /* Now make the output string */
110 snprintf(passwd, sizeof(passwd), "%s%s$", magic, salt_copy); 112 strcpy(passwd,magic);
113 strncat(passwd,sp,sl);
114 strcat(passwd,"$");
111 115
112 MD5_Final(final, &ctx); 116 MD5_Final(final,&ctx);
113 117
114 /* 118 /*
115 * and now, just to make sure things don't run too fast 119 * and now, just to make sure things don't run too fast
116 * On a 60 Mhz Pentium this takes 34 msec, so you would 120 * On a 60 Mhz Pentium this takes 34 msec, so you would
117 * need 30 seconds to build a 1000 entry dictionary... 121 * need 30 seconds to build a 1000 entry dictionary...
118 */ 122 */
119 for(i = 0; i < 1000; i++) { 123 for(i=0;i<1000;i++) {
120 MD5_Init(&ctx1); 124 MD5_Init(&ctx1);
121 if (i & 1) 125 if(i & 1)
122 MD5_Update(&ctx1, pw, strlen(pw)); 126 MD5_Update(&ctx1,pw,strlen(pw));
123 else 127 else
124 MD5_Update(&ctx1, final, 16); 128 MD5_Update(&ctx1,final,16);
125 129
126 if (i % 3) 130 if(i % 3)
127 MD5_Update(&ctx1, sp, sl); 131 MD5_Update(&ctx1,sp,sl);
128 132
129 if (i % 7) 133 if(i % 7)
130 MD5_Update(&ctx1, pw, strlen(pw)); 134 MD5_Update(&ctx1,pw,strlen(pw));
131 135
132 if (i & 1) 136 if(i & 1)
133 MD5_Update(&ctx1, final, 16); 137 MD5_Update(&ctx1,final,16);
134 else 138 else
135 MD5_Update(&ctx1, pw, strlen(pw)); 139 MD5_Update(&ctx1,pw,strlen(pw));
136 140 MD5_Final(final,&ctx1);
137 MD5_Final(final, &ctx1);
138 } 141 }
139 142
140 p = passwd + strlen(passwd); 143 p = passwd + strlen(passwd);
141 144
142 l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; 145 l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; to64(p,l,4); p += 4;
143 strlcat(passwd, to64(l, 4), sizeof(passwd)); 146 l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; to64(p,l,4); p += 4;
144 l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; 147 l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; to64(p,l,4); p += 4;
145 strlcat(passwd, to64(l, 4), sizeof(passwd)); 148 l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; to64(p,l,4); p += 4;
146 l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; 149 l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; to64(p,l,4); p += 4;
147 strlcat(passwd, to64(l, 4), sizeof(passwd)); 150 l = final[11] ; to64(p,l,2); p += 2;
148 l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; 151 *p = '\0';
149 strlcat(passwd, to64(l, 4), sizeof(passwd));
150 l = (final[ 4]<<16) | (final[10]<<8) | final[ 5];
151 strlcat(passwd, to64(l, 4), sizeof(passwd));
152 l = final[11] ;
153 strlcat(passwd, to64(l, 2), sizeof(passwd));
154 152
155 /* Don't leave anything around in vm they could use. */ 153 /* Don't leave anything around in vm they could use. */
156 memset(final, 0, sizeof(final)); 154 memset(final,0,sizeof final);
157 memset(salt_copy, 0, sizeof(salt_copy));
158 memset(&ctx, 0, sizeof(ctx));
159 memset(&ctx1, 0, sizeof(ctx1));
160 (void)to64(0, 4);
161 155
162 return (passwd); 156 return passwd;
163} 157}
164 158
165#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ 159#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-21 16:55:51 +0000