经典PHP加密解密函数Authcode()修复版代码
这篇文章主要介绍了经典PHP加密解密函数Authcode()修复版代码,需要的朋友可以参考下
Authcode这个函数很多人都使用,这函数来自Discuz程序,用于加密解密字符串,可以设置钥匙(key)和过期时间,在很多时候都用得着。原版的函数代码可能会生成+、/、&这样的字符,导致通过URL传值取回时被转义,导致无法解密。火端网络稍加修改,把这几个字符替换成其它字符,解密时再替换回去,这样就完美了!
代码如下:
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
|
function authcode( $string , $operation = 'DECODE' , $key = '' , $expiry = 0){ if ( $operation == 'DECODE' ) { $string = str_replace ( '[a]' , '+' , $string ); $string = str_replace ( '[b]' , '&' , $string ); $string = str_replace ( '[c]' , '/' , $string ); } $ckey_length = 4; $key = md5( $key ? $key : 'livcmsencryption ' ); $keya = md5( substr ( $key , 0, 16)); $keyb = md5( substr ( $key , 16, 16)); $keyc = $ckey_length ? ( $operation == 'DECODE' ? substr ( $string , 0, $ckey_length ): substr (md5(microtime()), - $ckey_length )) : '' ; $cryptkey = $keya .md5( $keya . $keyc ); $key_length = strlen ( $cryptkey ); $string = $operation == 'DECODE' ? base64_decode ( substr ( $string , $ckey_length )) : sprintf( '%010d' , $expiry ? $expiry + time() : 0). substr (md5( $string . $keyb ), 0, 16). $string ; $string_length = strlen ( $string ); $result = '' ; $box = range(0, 255); $rndkey = array (); for ( $i = 0; $i <= 255; $i ++) { $rndkey [ $i ] = ord( $cryptkey [ $i % $key_length ]); } for ( $j = $i = 0; $i < 256; $i ++) { $j = ( $j + $box [ $i ] + $rndkey [ $i ]) % 256; $tmp = $box [ $i ]; $box [ $i ] = $box [ $j ]; $box [ $j ] = $tmp ; } for ( $a = $j = $i = 0; $i < $string_length ; $i ++) { $a = ( $a + 1) % 256; $j = ( $j + $box [ $a ]) % 256; $tmp = $box [ $a ]; $box [ $a ] = $box [ $j ]; $box [ $j ] = $tmp ; $result .= chr (ord( $string [ $i ]) ^ ( $box [( $box [ $a ] + $box [ $j ]) % 256])); } if ( $operation == 'DECODE' ) { if (( substr ( $result , 0, 10) == 0 || substr ( $result , 0, 10) - time() > 0) && substr ( $result , 10, 16) == substr (md5( substr ( $result , 26). $keyb ), 0, 16)) { return substr ( $result , 26); } else { return '' ; } } else { $ustr = $keyc . str_replace ( '=' , '' , base64_encode ( $result )); $ustr = str_replace ( '+' , '[a]' , $ustr ); $ustr = str_replace ( '&' , '[b]' , $ustr ); $ustr = str_replace ( '/' , '[c]' , $ustr ); return $ustr ; } } |