PHP自定义加密方法、解密方法大集合(可逆/不可逆)
本文实例讲述了PHP使用自定义key实现对数据加密解密的方法。分享给大家供大家参考，具体如下：
客户端和服务端通信时，有个场景很常见，通过一个id作为url参数来回传递。假设现在业务上只有这个id标识，那么需要稍微安全一点的通信，对这个id进行加密传输，到服务端再进行解密。这里需要一个服务端进行保密的key，利用这个key进行加密和解密。
加解密的方法如下：$str是需要加解密的字符串，$key是自己定义的一个key
// 加密
function encryptStr($str, $key){
$block = mcrypt_get_block_size('des', 'ecb');
$pad = $block - (strlen($str) % $block);
$str .= str_repeat(chr($pad), $pad);
$enc_str = mcrypt_encrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
return base64_encode($enc_str);
}
// 解密
function decryptStr($str, $key){
$str = base64_decode($str);
$str = mcrypt_decrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);
$block = mcrypt_get_block_size('des', 'ecb');
$pad = ord($str[($len = strlen($str)) - 1]);
return substr($str, 0, strlen($str) - $pad);
}$content = "thisiscontent";
$key = "miyao";
//加密方法
function encode($string = '', $skey = 'wenzi') {
$strArr = str_split(base64_encode($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('', $strArr));
}
//解密方法
function decode($string = '', $skey = 'wenzi') {
$strArr = str_split(str_replace(array('O0O0O', 'o000o', 'oo00o'), array('=', '+', '/'), $string), 2);
$strCount = count($strArr);
foreach (str_split($skey) as $key => $value){
$key <= $strCount && $strArr[$key][1] === $value && $strArr[$key] = $strArr[$key][0];
}
return base64_decode(join('', $strArr));
}
$strings = encode($content,$key);
echo decode($strings,$key);一、第一种针对于ID的可逆加密函数，也可以用作于邀请码之类的，解密后的数据比较简单
示例：lockcode(28)=》000X unlockcode('000X')=》28
//加密函数
function lockcode($code) {
static $source_string = 'E5FCDG3HQA4B1NOPIJ2RSTUV67MWX89KLYZ';
$num = $code;
$code = '';
while ( $num > 0) {
$mod = $num % 35;
$num = ($num - $mod) / 35;
$code = $source_string[$mod].$code;
}
if(empty($code[3]))
$code = str_pad($code,4,'0',STR_PAD_LEFT);
return $code;
}
//解密函数
function unlockcode($code) {
static $source_string = 'E5FCDG3HQA4B1NOPIJ2RSTUV67MWX89KLYZ';
if (strrpos($code, '0') !== false)
$code = substr($code, strrpos($code, '0')+1);
$len = strlen($code);
$code = strrev($code);
$num = 0;
for ($i=0; $i < $len; $i++) {
$num += strpos($source_string, $code[$i]) * pow(35, $i);
}
return $num;
}二、第二种是加密函数是我在网上搜索来的，很好用，可逆加密，支持盐值参数
示例：encrypt('abcd','1234')=》nkiV93IfJ decrypt('nkiV93IfJ','1234')=》abcd
//加密函数
function encrypt($data,$key='CHENI'){
$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
$nh = rand(0,64);
$ch = $chars[$nh];
$mdKey = md5($key.$ch);
$mdKey = substr($mdKey,$nh%8, $nh%8+7);
$data= base64_encode($data);
$tmp = '';
$i=0;$j=0;$k = 0;
for ($i=0; $i<strlen($data); $i++) {
$k = $k == strlen($mdKey) ? 0 : $k;
$j = ($nh+strpos($chars,$data[$i])+ord($mdKey[$k++]))%64;
$tmp .= $chars[$j];
}
return urlencode($ch.$tmp);
}
//解密函数
function decrypt($data,$key='CHENI'){
$txt = urldecode($data);
$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($tmp);
}三、第三种跟上面的比较类似，也支持盐值参数
示例：encrypt('abcd','1234')=》mZPHxw== decrypt('mZPHxw==','1234')=》abcd
function encrypt($data, $key) {
$char="";
$str="";
$key = md5($key);
$x = 0;
$len = strlen($data);
$l = strlen($key);
for ($i = 0; $i < $len; $i++) {
if ($x == $l) { $x = 0; }
$char .= $key{$x};
$x++;
}
for ($i = 0; $i < $len; $i++){
$str .= chr(ord($data{$i}) + (ord($char{$i})) % 256);
}
return base64_encode($str);
}
function decrypt($data, $key) {
$key = md5($key);
$x = 0;
$data = base64_decode($data);
$len = strlen($data);
$l = strlen($key);
for ($i = 0; $i < $len; $i++) {
if ($x == $l){ $x = 0;}
$char .= substr($key, $x, 1);
$x++;
}
for ($i = 0; $i < $len; $i++){
if (ord(substr($data, $i, 1)) < ord(substr($char, $i, 1))){
$str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1)));
}else{
$str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1)));
}
}
return $str;
}四、这个是我用过最好用的一个了，discuz中使用的加密解密算法
//加密算法
function authcode($string,$key='',$operation=false,$expiry=0){
$ckey_length = 4;
$key = md5($key ? $key : DEFAULT_KEYS);
$keya = md5(substr($key, 0, 16));
$keyb = md5(substr($key, 16, 16));
$keyc = $ckey_length ? ($operation? substr($string, 0, $ckey_length):substr(md5(microtime()), -$ckey_length)) : '';
$cryptkey = $keya.md5($keya.$keyc);
$key_length = strlen($cryptkey);
$string = $operation? base64_decode(substr($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($operation) {
if((substr($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));
}
}
echo authcode('123456','key');
echo '<br>';
echo authcode('7d49kn9k07uSBZvha8as+/qm4UoLfpy88PFg12glPeDtlzc','key',true);
