01 | <? |
02 |
03 | class encryptCalss |
04 | { |
05 | var $key =12; |
06 | function encode( $txt ){ |
07 | for ( $i =0; $i < strlen ( $txt ); $i ++){ |
08 | $txt [ $i ]= chr (ord( $txt [ $i ])+ $this ->key); |
09 | } |
10 | return $txt =urlencode( base64_encode (urlencode( $txt ))); |
11 | } |
12 | function decode( $txt ){ |
13 | $txt =urldecode( base64_decode ( $txt )); |
14 | for ( $i =0; $i < strlen ( $txt ); $i ++){ |
15 | $txt [ $i ]= chr (ord( $txt [ $i ])- $this ->key); |
16 | } |
17 | return $txt ; |
18 | } |
19 | } |
20 |
21 | ?> |
01 | <?php |
02 | /** |
03 | * |
04 | * @param string $string 原文或者密文 |
05 | * @param string $operation 操作(ENCODE | DECODE), 默认为 DECODE |
06 | * @param string $key 密钥 |
07 | * @param int $expiry 密文有效期, 加密时候有效, 单位 秒,0 为永久有效 |
08 | * @return string 处理后的 原文或者 经过 base64_encode 处理后的密文 |
09 | * @example |
10 | * $a = authcode('abc', 'ENCODE', 'key'); |
11 | * $b = authcode($a, 'DECODE', 'key'); // $b(abc) |
12 | * |
13 | * $a = authcode('abc', 'ENCODE', 'key', 3600); |
14 | * $b = authcode('abc', 'DECODE', 'key'); // 在一个小时内,$b(abc),否则 $b 为空 |
15 | */ |
16 | function authcode( $string , $operation = 'DECODE' , $key = '' , $expiry =0){ |
17 |
18 | $ckey_length =4; |
19 |
20 | $key =md5( $key ? $key :\"kalvin.cn\"); |
21 | $keya =md5( substr ( $key ,0,16)); |
22 | $keyb =md5( substr ( $key ,16,16)); |
23 | $keyc = $ckey_length ? ( $operation == 'DECODE' ? substr ( $string ,0, $ckey_length ): substr (md5(microtime()),- $ckey_length )): '' ; |
24 |
25 | $cryptkey = $keya .md5( $keya . $keyc ); |
26 | $key_length = strlen ( $cryptkey ); |
27 |
28 | $string = $operation == 'DECODE' ? base64_decode ( substr ( $string , $ckey_length )):sprintf( '%010d' , $expiry ? $expiry +time():0). substr (md5( $string . $keyb ),0,16). $string ; |
29 | $string_length = strlen ( $string ); |
30 |
31 | $result = '' ; |
32 | $box =range(0,255); |
33 |
34 | $rndkey = array (); |
35 | for ( $i =0; $i <=255; $i ++){ |
36 | $rndkey [ $i ]=ord( $cryptkey [ $i % $key_length ]); |
37 | } |
38 |
39 | for ( $j = $i =0; $i <256; $i ++){ |
40 | $j =( $j + $box [ $i ]+ $rndkey [ $i ])%256; |
41 | $tmp = $box [ $i ]; |
42 | $box [ $i ]= $box [ $j ]; |
43 | $box [ $j ]= $tmp ; |
44 | } |
45 |
46 | for ( $a = $j = $i =0; $i < $string_length ; $i ++){ |
47 | $a =( $a +1)%256; |
48 | $j =( $j + $box [ $a ])%256; |
49 | $tmp = $box [ $a ]; |
50 | $box [ $a ]= $box [ $j ]; |
51 | $box [ $j ]= $tmp ; |
52 | $result .= chr (ord( $string [ $i ]) ^ ( $box [( $box [ $a ]+ $box [ $j ])%256])); |
53 | } |
54 |
55 | if ( $operation == 'DECODE' ){ |
56 | if (( substr ( $result ,0,10)==0|| substr ( $result ,0,10)-time()>0)&& substr ( $result ,10,16)== substr (md5( substr ( $result ,26). $keyb ),0,16)){ |
57 | returnsubstr( $result ,26); |
58 | } else { |
59 | return '' ; |
60 | } |
61 | } else { |
62 | return $keyc . str_replace ( '=' , '' , base64_encode ( $result )); |
63 | } |
64 |
65 | } |
66 | ?> |