php实现的加密解密功能函数可方便的用于网络传输和合法性验证。
//加密函数,可用cpDecode()函数解密,$data:待加密的字符串或数组;$key:密钥;$expire 过期时间 function cpEncode($data,$key='',$expire = 0){ $string=serialize($data); $ckey_length = 4; $key = md5($key); $keya = md5(substr($key, 0, 16)); $keyb = md5(substr($key, 16, 16)); $keyc = substr(md5(microtime()), -$ckey_length); $cryptkey = $keya.md5($keya.$keyc); $key_length = strlen($cryptkey); $string = sprintf('%010d', $expire ? $expire + time() : 0).substr(md5($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])); } return $keyc.str_replace('=', '', base64_encode($result)); } //cpEncode之后的解密函数,$string待解密的字符串,$key,密钥 function cpDecode($string,$key=''){ $ckey_length = 4; $key = md5($key); $keya = md5(substr($key, 0, 16)); $keyb = md5(substr($key, 16, 16)); $keyc = substr($string, 0, $ckey_length); $cryptkey = $keya.md5($keya.$keyc); $key_length = strlen($cryptkey); $string = base64_decode(substr($string, $ckey_length)); $string_length = strlen($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((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) { return unserialize(substr($result, 26)); }else{ return ''; } }
如果需要用于URL网络传输可通过rawurlencode()函数进行编码,然后在接收方利用rawurldecode() 进行解码。
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