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-rw-r--r--crypt_md5.c163
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diff --git a/crypt_md5.c b/crypt_md5.c
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1/*
2 +----------------------------------------------------------------------+
3 | PHP Version 5 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2006 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Author: Edin Kadribasic |
16 +----------------------------------------------------------------------+
17 */
18
19/* $Id: crypt_md5.c,v 1.1.1.1 2007-11-28 01:15:35 sesser Exp $ */
20
21/*
22 * ----------------------------------------------------------------------------
23 * "THE BEER-WARE LICENSE" (Revision 42):
24 * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
25 * can do whatever you want with this stuff. If we meet some day, and you think
26 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
27 * ----------------------------------------------------------------------------
28 *
29 * from FreeBSD: crypt.c,v 1.5 1996/10/14 08:34:02 phk Exp
30 * via OpenBSD: md5crypt.c,v 1.9 1997/07/23 20:58:27 kstailey Exp
31 * via NetBSD: md5crypt.c,v 1.4.2.1 2002/01/22 19:31:59 he Exp
32 *
33 */
34
35#include "php.h"
36#include "ext/standard/md5.h"
37#include "crypt_md5.h"
38
39static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
40 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
41
42static void to64(char *, php_uint32, int);
43
44static void
45to64(char *s, php_uint32 v, int n)
46{
47
48 while (--n >= 0) {
49 *s++ = itoa64[v & 0x3f];
50 v >>= 6;
51 }
52}
53
54/*
55 * MD5 password encryption.
56 */
57char *
58md5_crypt(const char *pw, const char *salt)
59{
60 static char passwd[120], *p;
61 const char *sp, *ep;
62 unsigned char final[16];
63 unsigned int i, sl, pwl;
64 PHP_MD5_CTX ctx, ctx1;
65 php_uint32 l;
66 int pl;
67
68 pwl = strlen(pw);
69
70 /* Refine the salt first */
71 sp = salt;
72
73 /* If it starts with the magic string, then skip that */
74 if (strncmp(sp, MD5_MAGIC, MD5_MAGIC_LEN) == 0)
75 sp += MD5_MAGIC_LEN;
76
77 /* It stops at the first '$', max 8 chars */
78 for (ep = sp; *ep != '\0' && *ep != '$' && ep < (sp + 8); ep++)
79 continue;
80
81 /* get the length of the true salt */
82 sl = ep - sp;
83
84 PHP_MD5Init(&ctx);
85
86 /* The password first, since that is what is most unknown */
87 PHP_MD5Update(&ctx, (const unsigned char *)pw, pwl);
88
89 /* Then our magic string */
90 PHP_MD5Update(&ctx, (const unsigned char *)MD5_MAGIC, MD5_MAGIC_LEN);
91
92 /* Then the raw salt */
93 PHP_MD5Update(&ctx, (const unsigned char *)sp, sl);
94
95 /* Then just as many characters of the MD5(pw,salt,pw) */
96 PHP_MD5Init(&ctx1);
97 PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
98 PHP_MD5Update(&ctx1, (const unsigned char *)sp, sl);
99 PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
100 PHP_MD5Final(final, &ctx1);
101
102 for (pl = pwl; pl > 0; pl -= 16)
103 PHP_MD5Update(&ctx, final, (unsigned int)(pl > 16 ? 16 : pl));
104
105 /* Don't leave anything around in vm they could use. */
106 memset(final, 0, sizeof(final));
107
108 /* Then something really weird... */
109 for (i = pwl; i != 0; i >>= 1)
110 if ((i & 1) != 0)
111 PHP_MD5Update(&ctx, final, 1);
112 else
113 PHP_MD5Update(&ctx, (const unsigned char *)pw, 1);
114
115 /* Now make the output string */
116 memcpy(passwd, MD5_MAGIC, MD5_MAGIC_LEN);
117 strlcpy(passwd + MD5_MAGIC_LEN, sp, sl + 1);
118 strcat(passwd, "$");
119
120 PHP_MD5Final(final, &ctx);
121
122 /*
123 * And now, just to make sure things don't run too fast. On a 60 MHz
124 * Pentium this takes 34 msec, so you would need 30 seconds to build
125 * a 1000 entry dictionary...
126 */
127 for (i = 0; i < 1000; i++) {
128 PHP_MD5Init(&ctx1);
129
130 if ((i & 1) != 0)
131 PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
132 else
133 PHP_MD5Update(&ctx1, final, 16);
134
135 if ((i % 3) != 0)
136 PHP_MD5Update(&ctx1, (const unsigned char *)sp, sl);
137
138 if ((i % 7) != 0)
139 PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
140
141 if ((i & 1) != 0)
142 PHP_MD5Update(&ctx1, final, 16);
143 else
144 PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
145
146 PHP_MD5Final(final, &ctx1);
147 }
148
149 p = passwd + sl + MD5_MAGIC_LEN + 1;
150
151 l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; to64(p,l,4); p += 4;
152 l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; to64(p,l,4); p += 4;
153 l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; to64(p,l,4); p += 4;
154 l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; to64(p,l,4); p += 4;
155 l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; to64(p,l,4); p += 4;
156 l = final[11] ; to64(p,l,2); p += 2;
157 *p = '\0';
158
159 /* Don't leave anything around in vm they could use. */
160 memset(final, 0, sizeof(final));
161 return (passwd);
162}
163