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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/********************************************************************\
* BitlBee -- An IRC to other IM-networks gateway *
* *
* Copyright 2002-2004 Sjoerd Hemminga and others *
\********************************************************************/
/* A little bit of encryption for the users' passwords */
/*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License with
the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
if not, write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA 02111-1307 USA
*/
/* [WvG] This file can also be compiled into a stand-alone program
which can encode/decode BitlBee account files. The main() will be
included if CRYPTING_MAIN is defined. Or just do "make decode" and
the programs will be built. */
#include <bitlbee.h>
#include "md5.h"
#include "crypting.h"
/*\
* [SH] Do _not_ call this if it's not entirely sure that it will not cause
* harm to another users file, since this does not check the password for
* correctness.
\*/
int checkpass (const char *pass, const char *md5sum)
{
md5_state_t md5state;
md5_byte_t digest[16];
int i, j;
char digits[3];
md5_init (&md5state);
md5_append (&md5state, (unsigned char *)pass, strlen (pass));
md5_finish (&md5state, digest);
for (i = 0, j = 0; i < 16; i++, j += 2) {
/* Check password for correctness */
g_snprintf (digits, sizeof (digits), "%02x\n", digest[i]);
if (digits[0] != md5sum[j]) return (-1);
if (digits[1] != md5sum[j + 1]) return (-1);
}
return( 0 );
}
char *hashpass (const char *password)
{
md5_state_t md5state;
md5_byte_t digest[16];
int i;
char digits[3];
char *rv;
if (password == NULL) return (NULL);
rv = g_new0 (char, 33);
md5_init (&md5state);
md5_append (&md5state, (const unsigned char *)password, strlen (password));
md5_finish (&md5state, digest);
for (i = 0; i < 16; i++) {
/* Build a hash of the pass */
g_snprintf (digits, sizeof (digits), "%02x", digest[i]);
strcat (rv, digits);
}
return (rv);
}
char *obfucrypt (char *line, const char *password)
{
int i, j;
char *rv;
if (password == NULL) return (NULL);
rv = g_new0 (char, strlen (line) + 1);
i = j = 0;
while (*line) {
/* Encrypt/obfuscate the line, using the password */
if (*(signed char*)line < 0) *line = - (*line);
rv[j] = *line + password[i]; /* Overflow intended */
line++;
if (!password[++i]) i = 0;
j++;
}
return (rv);
}
char *deobfucrypt (char *line, const char *password)
{
int i, j;
char *rv;
if (password == NULL) return (NULL);
rv = g_new0 (char, strlen (line) + 1);
i = j = 0;
while (*line) {
/* Decrypt/deobfuscate the line, using the pass */
rv[j] = *line - password[i]; /* Overflow intended */
line++;
if (!password[++i]) i = 0;
j++;
}
return (rv);
}
#ifdef CRYPTING_MAIN
/* A little main() function for people who want a stand-alone program to
encode/decode BitlCrypted files. */
int main( int argc, char *argv[] )
{
char *hash, *action, line[256];
char* (*func)( char *, const char * );
if( argc < 2 )
{
fprintf( stderr, "Usage: %s <password>\n\n"
"Reads from stdin, writes to stdout.\n"
"Call as \"encode\" to encode, \"decode\" to decode.\n", argv[0] );
return( 1 );
}
hash = hashpass( argv[1] );
action = argv[0] + strlen( argv[0] ) - strlen( "encode" );
if( strcmp( action, "encode" ) == 0 )
{
fwrite( hash, 32, 1, stdout );
func = obfucrypt;
}
else if( strcmp( action, "decode" ) == 0 )
{
char hash2[32];
fread( hash2, 32, 1, stdin );
if( memcmp( hash, hash2, 32 ) != 0 )
{
fprintf( stderr, "Passwords don't match. Can't decode.\n" );
return( 1 );
}
func = deobfucrypt;
}
else
{
return( main( 0, NULL ) );
}
while( fscanf( stdin, "%[^\n]255s", line ) > 0 )
{
char *out;
/* Flush the newline */
fgetc( stdin );
out = func( line, argv[1] );
printf( "%s\n", out );
g_free( out );
}
return( 0 );
}
#endif
|
