1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*-------------------------------------------------------------------------
*
* md5_common.c
* Routines shared between all MD5 implementations used for encrypted
* passwords.
*
* Sverre H. Huseby <sverrehu@online.no>
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/common/md5_common.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#include "common/cryptohash.h"
#include "common/md5.h"
static void
bytesToHex(uint8 b[16], char *s)
{
static const char *hex = "0123456789abcdef";
int q,
w;
for (q = 0, w = 0; q < 16; q++)
{
s[w++] = hex[(b[q] >> 4) & 0x0F];
s[w++] = hex[b[q] & 0x0F];
}
s[w] = '\0';
}
/*
* pg_md5_hash
*
* Calculates the MD5 sum of the bytes in a buffer.
*
* SYNOPSIS #include "md5.h"
* int pg_md5_hash(const void *buff, size_t len, char *hexsum)
*
* INPUT buff the buffer containing the bytes that you want
* the MD5 sum of.
* len number of bytes in the buffer.
*
* OUTPUT hexsum the MD5 sum as a '\0'-terminated string of
* hexadecimal digits. an MD5 sum is 16 bytes long.
* each byte is represented by two hexadecimal
* characters. you thus need to provide an array
* of 33 characters, including the trailing '\0'.
*
* errstr filled with a constant-string error message
* on failure return; NULL on success.
*
* RETURNS false on failure (out of memory for internal buffers
* or MD5 computation failure) or true on success.
*
* STANDARDS MD5 is described in RFC 1321.
*
* AUTHOR Sverre H. Huseby <sverrehu@online.no>
*
*/
bool
pg_md5_hash(const void *buff, size_t len, char *hexsum, const char **errstr)
{
uint8 sum[MD5_DIGEST_LENGTH];
pg_cryptohash_ctx *ctx;
*errstr = NULL;
ctx = pg_cryptohash_create(PG_MD5);
if (ctx == NULL)
{
*errstr = pg_cryptohash_error(NULL); /* returns OOM */
return false;
}
if (pg_cryptohash_init(ctx) < 0 ||
pg_cryptohash_update(ctx, buff, len) < 0 ||
pg_cryptohash_final(ctx, sum, sizeof(sum)) < 0)
{
*errstr = pg_cryptohash_error(ctx);
pg_cryptohash_free(ctx);
return false;
}
bytesToHex(sum, hexsum);
pg_cryptohash_free(ctx);
return true;
}
/*
* pg_md5_binary
*
* As above, except that the MD5 digest is returned as a binary string
* (of size MD5_DIGEST_LENGTH) rather than being converted to ASCII hex.
*/
bool
pg_md5_binary(const void *buff, size_t len, void *outbuf, const char **errstr)
{
pg_cryptohash_ctx *ctx;
*errstr = NULL;
ctx = pg_cryptohash_create(PG_MD5);
if (ctx == NULL)
{
*errstr = pg_cryptohash_error(NULL); /* returns OOM */
return false;
}
if (pg_cryptohash_init(ctx) < 0 ||
pg_cryptohash_update(ctx, buff, len) < 0 ||
pg_cryptohash_final(ctx, outbuf, MD5_DIGEST_LENGTH) < 0)
{
*errstr = pg_cryptohash_error(ctx);
pg_cryptohash_free(ctx);
return false;
}
pg_cryptohash_free(ctx);
return true;
}
/*
* Computes MD5 checksum of "passwd" (a null-terminated string) followed
* by "salt" (which need not be null-terminated).
*
* Output format is "md5" followed by a 32-hex-digit MD5 checksum.
* Hence, the output buffer "buf" must be at least 36 bytes long.
*
* Returns true if okay, false on error with *errstr providing some
* error context.
*/
bool
pg_md5_encrypt(const char *passwd, const char *salt, size_t salt_len,
char *buf, const char **errstr)
{
size_t passwd_len = strlen(passwd);
/* +1 here is just to avoid risk of unportable malloc(0) */
char *crypt_buf = malloc(passwd_len + salt_len + 1);
bool ret;
if (!crypt_buf)
{
*errstr = _("out of memory");
return false;
}
/*
* Place salt at the end because it may be known by users trying to crack
* the MD5 output.
*/
memcpy(crypt_buf, passwd, passwd_len);
memcpy(crypt_buf + passwd_len, salt, salt_len);
strcpy(buf, "md5");
ret = pg_md5_hash(crypt_buf, passwd_len + salt_len, buf + 3, errstr);
free(crypt_buf);
return ret;
}
|
