PostgreSQL Source Code: contrib/pgcrypto/crypt-md5.c Source File

PostgreSQL Source Code git master
crypt-md5.c
Go to the documentation of this file.
1/*
2 * File imported from FreeBSD, original by Poul-Henning Kamp.
3 *
4 * $FreeBSD: src/lib/libcrypt/crypt-md5.c,v 1.5 1999年12月17日 20:21:45 peter Exp $
5 *
6 * contrib/pgcrypto/crypt-md5.c
7 */
8
9#include "postgres.h"
10
11#include "px-crypt.h"
12#include "px.h"
13
14 #define MD5_SIZE 16
15
16 static const char _crypt_a64[] =
17"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
18
19static void
20 _crypt_to64(char *s, unsigned long v, int n)
21{
22 while (--n >= 0)
23 {
24 *s++ = _crypt_a64[v & 0x3f];
25 v >>= 6;
26 }
27}
28
29/*
30 * UNIX password
31 */
32
33char *
34 px_crypt_md5(const char *pw, const char *salt, char *passwd, unsigned dstlen)
35{
36 static const char *magic = "1ドル$"; /* This string is magic for this
37 * algorithm. Having it this way, we
38 * can get better later on */
39 char *p;
40 const char *sp,
41 *ep;
42 unsigned char final[MD5_SIZE];
43 int sl,
44 pl,
45 i;
46 PX_MD *ctx,
47 *ctx1;
48 int err;
49 unsigned long l;
50
51 if (!passwd || dstlen < 120)
52 return NULL;
53
54 /* Refine the Salt first */
55 sp = salt;
56
57 /* If it starts with the magic string, then skip that */
58 if (strncmp(sp, magic, strlen(magic)) == 0)
59 sp += strlen(magic);
60
61 /* It stops at the first '$', max 8 chars */
62 for (ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++)
63 continue;
64
65 /* get the length of the true salt */
66 sl = ep - sp;
67
68 /* we need two PX_MD objects */
69 err = px_find_digest("md5", &ctx);
70 if (err)
71 return NULL;
72 err = px_find_digest("md5", &ctx1);
73 if (err)
74 {
75 /* this path is possible under low-memory circumstances */
76 px_md_free(ctx);
77 return NULL;
78 }
79
80 /* The password first, since that is what is most unknown */
81 px_md_update(ctx, (const uint8 *) pw, strlen(pw));
82
83 /* Then our magic string */
84 px_md_update(ctx, (const uint8 *) magic, strlen(magic));
85
86 /* Then the raw salt */
87 px_md_update(ctx, (const uint8 *) sp, sl);
88
89 /* Then just as many characters of the MD5(pw,salt,pw) */
90 px_md_update(ctx1, (const uint8 *) pw, strlen(pw));
91 px_md_update(ctx1, (const uint8 *) sp, sl);
92 px_md_update(ctx1, (const uint8 *) pw, strlen(pw));
93 px_md_finish(ctx1, final);
94 for (pl = strlen(pw); pl > 0; pl -= MD5_SIZE)
95 px_md_update(ctx, final, pl > MD5_SIZE ? MD5_SIZE : pl);
96
97 /* Don't leave anything around in vm they could use. */
98 px_memset(final, 0, sizeof final);
99
100 /* Then something really weird... */
101 for (i = strlen(pw); i; i >>= 1)
102 if (i & 1)
103 px_md_update(ctx, final, 1);
104 else
105 px_md_update(ctx, (const uint8 *) pw, 1);
106
107 /* Now make the output string */
108 strcpy(passwd, magic);
109 strncat(passwd, sp, sl);
110 strcat(passwd, "$");
111
112 px_md_finish(ctx, final);
113
114 /*
115 * and now, just to make sure things don't run too fast On a 60 Mhz
116 * Pentium this takes 34 msec, so you would need 30 seconds to build a
117 * 1000 entry dictionary...
118 */
119 for (i = 0; i < 1000; i++)
120 {
121 px_md_reset(ctx1);
122 if (i & 1)
123 px_md_update(ctx1, (const uint8 *) pw, strlen(pw));
124 else
125 px_md_update(ctx1, final, MD5_SIZE);
126
127 if (i % 3)
128 px_md_update(ctx1, (const uint8 *) sp, sl);
129
130 if (i % 7)
131 px_md_update(ctx1, (const uint8 *) pw, strlen(pw));
132
133 if (i & 1)
134 px_md_update(ctx1, final, MD5_SIZE);
135 else
136 px_md_update(ctx1, (const uint8 *) pw, strlen(pw));
137 px_md_finish(ctx1, final);
138 }
139
140 p = passwd + strlen(passwd);
141
142 l = (final[0] << 16) | (final[6] << 8) | final[12];
143 _crypt_to64(p, l, 4);
144 p += 4;
145 l = (final[1] << 16) | (final[7] << 8) | final[13];
146 _crypt_to64(p, l, 4);
147 p += 4;
148 l = (final[2] << 16) | (final[8] << 8) | final[14];
149 _crypt_to64(p, l, 4);
150 p += 4;
151 l = (final[3] << 16) | (final[9] << 8) | final[15];
152 _crypt_to64(p, l, 4);
153 p += 4;
154 l = (final[4] << 16) | (final[10] << 8) | final[5];
155 _crypt_to64(p, l, 4);
156 p += 4;
157 l = final[11];
158 _crypt_to64(p, l, 2);
159 p += 2;
160 *p = '0円';
161
162 /* Don't leave anything around in vm they could use. */
163 px_memset(final, 0, sizeof final);
164
165 px_md_free(ctx1);
166 px_md_free(ctx);
167
168 return passwd;
169}
uint8_t uint8
Definition: c.h:536
#define MD5_SIZE
Definition: crypt-md5.c:14
char * px_crypt_md5(const char *pw, const char *salt, char *passwd, unsigned dstlen)
Definition: crypt-md5.c:34
static const char _crypt_a64[]
Definition: crypt-md5.c:16
static void _crypt_to64(char *s, unsigned long v, int n)
Definition: crypt-md5.c:20
void err(int eval, const char *fmt,...)
Definition: err.c:43
i
int i
Definition: isn.c:77
int px_find_digest(const char *name, PX_MD **res)
Definition: openssl.c:161
void px_memset(void *ptr, int c, size_t len)
Definition: px.c:123
#define px_md_finish(md, buf)
Definition: px.h:206
#define px_md_free(md)
Definition: px.h:207
#define px_md_reset(md)
Definition: px.h:204
#define px_md_update(md, data, dlen)
Definition: px.h:205
Definition: px.h:108

AltStyle によって変換されたページ (->オリジナル) /