PHP加密解密类实例代码


            关键代码如下所示：





<?php

function i_array_column($input, $columnKey, $indexKey=null){

if(!function_exists('array_column')){

$columnKeyIsNumber = (is_numeric($columnKey))?true:false;

$indexKeyIsNull = (is_null($indexKey))?true :false;

$indexKeyIsNumber = (is_numeric($indexKey))?true:false;

$result = array();

foreach((array)$input as $key=>$row){

if($columnKeyIsNumber){

$tmp= array_slice($row, $columnKey, 1);

$tmp= (is_array($tmp) && !empty($tmp))?current($tmp):null;

}else{

$tmp= isset($row[$columnKey])?$row[$columnKey]:null;

}

if(!$indexKeyIsNull){

if($indexKeyIsNumber){

$key = array_slice($row, $indexKey, 1);

$key = (is_array($key) && !empty($key))?current($key):null;

$key = is_null($key)?0:$key;

}else{

$key = isset($row[$indexKey])?$row[$indexKey]:0;

}

}

$result[$key] = $tmp;

}

return $result;

}else{

return array_column($input, $columnKey, $indexKey);

}

}

function randcode($len, $mode = 2){

$rcode = '';

switch($mode){

case 1: //去除0、o、O、l等易混淆字符

$chars = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789abcdefghijkmnpqrstuvwxyz';

break;

case 2: //纯数字

$chars = '0123456789';

break;

case 3: //全数字+大小写字母

$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';

break;

case 4: //全数字+大小写字母+一些特殊字符

$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz~!@#$%^&*()';

break;

}

$count = strlen($chars) - 1;

mt_srand((double)microtime() * 1000000);

for($i = 0; $i < $len; $i++) {

$rcode .= $chars[mt_rand(0, $count)];

}

return $rcode;

}

/**

* $string 明文或密文

* $operation 加密ENCODE或解密DECODE

* $key 密钥

* $expiry 密钥有效期

*/

function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {

$ckey_length = 4;

$key = md5($key);

$keya = md5(substr($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 {

return $keyc.str_replace('=', '', base64_encode($result));

}

}



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