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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) 1999-2004 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 | ** $Id$ |
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16 | * @package plugins |
17 | * @subpackage mail_fetch |
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18 | **/ |
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19 | |
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20 | /** |
21 | * hex2bin - document me |
22 | */ |
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23 | function hex2bin( $data ) { |
24 | |
25 | /* Original code by josh@superfork.com */ |
26 | |
27 | $len = strlen($data); |
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28 | $newdata = ''; |
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29 | for( $i=0; $i < $len; $i += 2 ) { |
30 | $newdata .= pack( "C", hexdec( substr( $data, $i, 2) ) ); |
31 | } |
32 | return $newdata; |
33 | } |
34 | |
35 | function mf_keyED( $txt ) { |
36 | |
37 | global $MF_TIT; |
38 | |
39 | if( !isset( $MF_TIT ) ) { |
40 | $MF_TIT = "MailFetch Secure for SquirrelMail 1.x"; |
41 | } |
42 | |
43 | $encrypt_key = md5( $MF_TIT ); |
44 | $ctr = 0; |
45 | $tmp = ""; |
46 | for( $i = 0; $i < strlen( $txt ); $i++ ) { |
47 | if( $ctr == strlen( $encrypt_key ) ) $ctr=0; |
48 | $tmp.= substr( $txt, $i, 1 ) ^ substr( $encrypt_key, $ctr, 1 ); |
49 | $ctr++; |
50 | } |
51 | return $tmp; |
52 | } |
53 | |
54 | function encrypt( $txt ) { |
55 | |
56 | srand( (double) microtime() * 1000000 ); |
57 | $encrypt_key = md5( rand( 0, 32000 ) ); |
58 | $ctr = 0; |
59 | $tmp = ""; |
60 | for( $i = 0; $i < strlen( $txt ); $i++ ) { |
61 | if ($ctr==strlen($encrypt_key)) $ctr=0; |
62 | $tmp.= substr($encrypt_key,$ctr,1) . |
63 | (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1)); |
64 | $ctr++; |
65 | } |
66 | return bin2hex( mf_keyED( $tmp ) ); |
67 | |
68 | } |
69 | |
70 | function decrypt( $txt ) { |
71 | |
72 | $txt = mf_keyED( hex2bin( $txt ) ); |
73 | $tmp = ''; |
74 | for ( $i=0; $i < strlen( $txt ); $i++ ) { |
75 | $md5 = substr( $txt, $i, 1 ); |
76 | $i++; |
77 | $tmp.= ( substr( $txt, $i, 1 ) ^ $md5 ); |
78 | } |
79 | return $tmp; |
80 | } |
81 | |
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82 | ?> |