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:- function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0){; R$ S4 E4 H2 ~8 v+ Y8 s
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- - h7 d, @# a5 I! O. v% S if($operation == 'DECODE') {6 N+ ~0 T3 M Z) ^% B
- $string = str_replace('[a]','+',$string);; v3 {' j' ^, ?6 U* c
- $string = str_replace('[b]','&',$string);& W' B8 _( C( c" q% F- l, _' C
- $string = str_replace('[c]','/',$string);% O% { H. X$ t) Q/ L
- }8 L# J4 d6 M- K, U% p
- $ckey_length = 4;
- ) j& ^& f! T# }2 b $key = md5($key ? $key : 'livcmsencryption ');% C0 o1 m6 o: f# _: D
- $keya = md5(substr($key, 0, 16));7 g6 z2 P1 N/ D+ w$ K$ b
- $keyb = md5(substr($key, 16, 16));
- 6 i, v8 o/ p; u% j) G: s" b! y6 W $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';) U. q" Q( D, }8 I# y+ o0 p0 |
- $cryptkey = $keya.md5($keya.$keyc);5 y0 w4 E. L! q* E: r) G) {8 e
- $key_length = strlen($cryptkey);7 ^/ b$ \+ U3 O: [* X) j
- $string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
- : {" y7 ]0 t) q% q$ v. x2 q $string_length = strlen($string);
- 9 }. }. ]1 E N, }4 [- W $result = '';& C* U+ ?" ^5 C5 I
- $box = range(0, 255);! P: }9 a( J3 h; m( L G
- $rndkey = array();
- 3 d' u. x2 @! c0 c4 g for($i = 0; $i <= 255; $i++) {0 p$ E8 i: ~) ~6 N1 o+ O
- $rndkey[$i] = ord($cryptkey[$i % $key_length]);
- 3 i. E3 T. J- D' p: l2 v }
- ) H7 B. ]( n. u. ~ for($j = $i = 0; $i < 256; $i++) { K/ O' F K D2 Z' D
- $j = ($j + $box[$i] + $rndkey[$i]) % 256;
- * t" j1 _- l" E X( D6 @* a $tmp = $box[$i];
- 6 }9 a0 q: a' Q $box[$i] = $box[$j];
- ! d6 n5 |3 {8 m5 C $box[$j] = $tmp;
- 4 O5 U$ R, ~5 W+ f9 ?. x }1 Z* P" a* g; I' Y% ?. x$ ?
- for($a = $j = $i = 0; $i < $string_length; $i++) {
- # Y9 T0 u5 }, o- h0 l# g; } $a = ($a + 1) % 256;
- ' ~$ [4 j$ H$ H1 j $j = ($j + $box[$a]) % 256;+ @* f, F6 U( e# ~! w
- $tmp = $box[$a];
- % ^ s m4 R. R8 y5 B- ^ $box[$a] = $box[$j];) [, i q* @6 J9 B/ A, x
- $box[$j] = $tmp;; e' I2 i! R/ V" I8 R& M% [2 P
- $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));8 ]' [ H( F' h( T
- }6 _7 c L+ \$ Q9 G
- if($operation == 'DECODE') {
- ; f$ \7 X% c' i/ I* n" s7 J* Q if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
- ; h" J6 N% y1 Q2 I& K6 _
- # S1 b+ {* I6 I4 ^ return substr($result, 26);/ E( z T+ l: L) D ]8 O5 }
- } else {9 z. A8 I9 \& ~) H9 s0 X
- return '';4 i- x! `- @. `
- }
- / ~7 Y4 M0 U, V0 _ } else {
- - R! p3 {# ?* B1 ?9 Y2 n( l $ustr = $keyc.str_replace('=', '', base64_encode($result));
- 3 t2 q+ o* b- U( s8 Y* ^% ] $ustr = str_replace('+','[a]',$ustr);4 G# E3 k3 {! Y) s
- $ustr = str_replace('&','[b]',$ustr);
- 9 e& c+ f% e7 d( t. ^' b $ustr = str_replace('/','[c]',$ustr);
- * N/ Y4 N' {& A; o6 E& P return $ustr;( N- J3 f& T% J, |7 k- N& f/ I
- }; z% V8 q, [+ W: c3 i& ]4 c6 f
- }
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