最近搞一点东西要用到对称加密,于是在网上找到一个不错的对称加密方法,分享给大家。
/**
* 简单对称加密算法之加密
* @param String $string 需要加密的字串
* @param String $skey 加密EKY
* @return String
*/
function encode($string = '', $skey = 'cxphp') {
$strArr = str_split(base64_encode($string));
$strCount = count($strArr);
foreach (str_split($skey) as $key => $value)
$key < $strCount && $strArr[$key].=$value;
return str_replace(array('=', '+', '/'), array('O0O0O', 'o000o', 'oo00o'), join('', $strArr));
}
/**
* 简单对称加密算法之解密
* @param String $string 需要解密的字串
* @param String $skey 解密KEY
* @return String
*/
function decode($string = '', $skey = 'cxphp') {
$strArr = str_split(str_replace(array('O0O0O', 'o000o', 'oo00o'), array('=', '+', '/'), $string), 2);
$strCount = count($strArr);
foreach (str_split($skey) as $key => $value)
$key <= $strCount && isset($strArr[$key]) && $strArr[$key][1] === $value && $strArr[$key] = $strArr[$key][0];
return base64_decode(join('', $strArr));
}
echo '<pre>';
echo "encode : " . ($enstring = encode($str)) . '<br />';
echo "decode : " . decode($enstring);
die();
安全URL编码
/**
* 安全URL编码
* @param string $data
* @return string
*/
function encode($data) {
return str_replace(array('+', '/', '='), array('-', '_', ''), base64_encode(serialize($data)));
}
function decode($string) {
$data = str_replace(array('-', '_'), array('+', '/'), $string);
$mod4 = strlen($data) % 4;
($mod4) && $data .= substr('====', $mod4);
return unserialize(base64_decode($data));
}
UTF8字符串加密
/**
* UTF8字符串加密
* @param string $string
* @return string
*/
function encode($string) {
$chars = '';
$len = strlen($string = iconv('utf-8', 'gbk', $string));
for ($i = 0; $i < $len; $i++) {
$chars .= str_pad(base_convert(ord($string[$i]), 10, 36), 2, 0, 0);
}
return strtoupper($chars);
}
function decode($string) {
$chars = '';
foreach (str_split($string, 2) as $char) {
$chars .= chr(intval(base_convert($char, 36, 10)));
}
return iconv('gbk', 'utf-8', $chars);
}
别的方法
//字符串加密
function lockString($txt,$key)
{
$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
$nh = rand(0,64);
$ch = $chars[$nh];
$mdKey = md5($key.$ch);
$mdKey = substr($mdKey,$nh%8, $nh%8+7);
$txt = base64_encode($txt);
$tmp = '';
$i=0;$j=0;$k = 0;
for ($i=0; $i<strlen($txt); $i++) {
$k = $k == strlen($mdKey) ? 0 : $k;
$j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;
$tmp .= $chars[$j];
}
return urlencode($ch.$tmp);
}
function unlockString($txt,$key)
{
$txt = urldecode($txt);
$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
$ch = $txt[0];
$nh = strpos($chars,$ch);
$mdKey = md5($key.$ch);
$mdKey = substr($mdKey,$nh%8, $nh%8+7);
$txt = substr($txt,1);
$tmp = '';
$i=0;$j=0; $k = 0;
for ($i=0; $i<strlen($txt); $i++) {
$k = $k == strlen($mdKey) ? 0 : $k;
$j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);
while ($j<0) $j+=64;
$tmp .= $chars[$j];
}
return base64_decode($tmp);
}
auth_code优化版
/**
* @param string $string 加密字符串内容
* @param string $operation 加密或者解密
* @param string $key 私钥
* @param int $expiry 过期时间/秒 0为永不过期
* @return false|string
*/
function auth_code(string $string, $operation = 'DECODE', $key = '', $expiry = 0)
{
$cakey_length = 4;
$key = md5($key);
$keys = md5(substr($key, 0, 16));
$keytab = md5(substr($key, 16, 16));
if ($operation === 'DECODE') {
$key_str = substr($string, 0, $cakey_length);
} else {
$key_str = substr(md5(microtime()), -$cakey_length);
}
$keycode = $cakey_length ? $key_str : '';
$cryptic = $keys . md5($keys . $keycode);
$key_length = strlen($cryptic);
$string = $operation === 'DECODE' ? base64_decode(substr($string, $cakey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0) . substr(md5($string . $keytab), 0, 16) . $string;
$string_length = strlen($string);
$result = '';
$box = range(0, 255);
$render = array();
for ($i = 0; $i <= 255; $i++) {
$render[$i] = ord($cryptic[$i % $key_length]);
}
for ($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $render[$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 ($operation === 'DECODE') {
if ((strpos($result, 0) === 0 || substr($result, 0, 10) - time() > 0) && strpos(md5(substr($result, 26) . $keytab), substr($result, 10, 16)) === 0) {
return substr($result, 26);
}
return '';
}
return $keycode . str_replace('=', '', base64_encode($result));
}
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