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1 | <?php |
2 | |
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3 | /** |
4 | ** mail_fetch/functions.php |
5 | ** |
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6 | ** Copyright (c) 1999-2003 The SquirrelMail Project Team |
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7 | ** Licensed under the GNU GPL. For full terms see the file COPYING. |
8 | ** |
9 | ** Functions for the mailfetch plugin. |
10 | ** |
11 | ** Original code from LexZEUS <lexzeus@mifinca.com> |
12 | ** and josh@superfork.com (extracted from php manual) |
13 | ** Adapted for MailFetch by Philippe Mingo <mingo@rotedic.com> |
14 | ** |
15 | ** $Id$ |
16 | **/ |
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17 | |
18 | function hex2bin( $data ) { |
19 | |
20 | /* Original code by josh@superfork.com */ |
21 | |
22 | $len = strlen($data); |
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23 | $newdata = ''; |
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24 | for( $i=0; $i < $len; $i += 2 ) { |
25 | $newdata .= pack( "C", hexdec( substr( $data, $i, 2) ) ); |
26 | } |
27 | return $newdata; |
28 | } |
29 | |
30 | function mf_keyED( $txt ) { |
31 | |
32 | global $MF_TIT; |
33 | |
34 | if( !isset( $MF_TIT ) ) { |
35 | $MF_TIT = "MailFetch Secure for SquirrelMail 1.x"; |
36 | } |
37 | |
38 | $encrypt_key = md5( $MF_TIT ); |
39 | $ctr = 0; |
40 | $tmp = ""; |
41 | for( $i = 0; $i < strlen( $txt ); $i++ ) { |
42 | if( $ctr == strlen( $encrypt_key ) ) $ctr=0; |
43 | $tmp.= substr( $txt, $i, 1 ) ^ substr( $encrypt_key, $ctr, 1 ); |
44 | $ctr++; |
45 | } |
46 | return $tmp; |
47 | } |
48 | |
49 | function encrypt( $txt ) { |
50 | |
51 | srand( (double) microtime() * 1000000 ); |
52 | $encrypt_key = md5( rand( 0, 32000 ) ); |
53 | $ctr = 0; |
54 | $tmp = ""; |
55 | for( $i = 0; $i < strlen( $txt ); $i++ ) { |
56 | if ($ctr==strlen($encrypt_key)) $ctr=0; |
57 | $tmp.= substr($encrypt_key,$ctr,1) . |
58 | (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1)); |
59 | $ctr++; |
60 | } |
61 | return bin2hex( mf_keyED( $tmp ) ); |
62 | |
63 | } |
64 | |
65 | function decrypt( $txt ) { |
66 | |
67 | $txt = mf_keyED( hex2bin( $txt ) ); |
68 | $tmp = ''; |
69 | for ( $i=0; $i < strlen( $txt ); $i++ ) { |
70 | $md5 = substr( $txt, $i, 1 ); |
71 | $i++; |
72 | $tmp.= ( substr( $txt, $i, 1 ) ^ $md5 ); |
73 | } |
74 | return $tmp; |
75 | } |
76 | |
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77 | ?> |