偶然间在别人博客发现的，感觉挺实用就给搬了过来
代码语言：javascript复制<?php
/**
* rc4,解密方法直接再一次加密就是解密
* @param [type] $data 要加密的数据
* @param [type] $pwd 加密使用的 key
* @return [type] [description]
*/
function rc4($data, $pwd) {
$key[] = "";
$box[] = "";
$pwd_length = strlen($pwd);
$data_length = strlen($data);
$cipher = '';
for ($i = 0; $i < 256; $i ) {
$key[$i] = ord($pwd[$i % $pwd_length]);
$box[$i] = $i;
}
for ($j = $i = 0; $i < 256; $i ) {
$j = ($j $box[$i] $key[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for ($a = $j = $i = 0; $i < $data_length; $i ) {
$a = ($a 1) % 256;
$j = ($j $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$k = $box[(($box[$a] $box[$j]) % 256)];
$cipher .= chr(ord($data[$i]) ^ $k);
}
return $cipher;
}
$msgkey = 'blog.kieng.cn';
$enstr = base64_encode(rc4('blog.kieng.cn', $msgkey));
echo "RC4 加密:";
echo "<br>";
echo $enstr;
echo "<br>";
$destr = rc4(base64_decode($enstr), $msgkey);
echo $destr;
echo "<hr>";
/**
* @FunctionName authcode
* @param [string] $string [加(解)密文本]
* @param string $operation [加/解密]
* @param string $key [密匙]
* @param int $expiry [密匙有效期]
* @return [type] [加密后的文本]
*/
function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
// 动态密匙长度，相同的明文会生成不同密文就是依靠动态密匙
$ckey_length = 4;
// 密匙
$key = md5($key ? $key : $GLOBALS['discuz_auth_key']);
// 密匙 a 会参与加解密
$keya = md5(substr($key, 0, 16));
// 密匙 b 会用来做数据完整性验证
$keyb = md5(substr($key, 16, 16));
// 密匙 c 用于变化生成的密文
$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length) :
substr(md5(microtime()), -$ckey_length)) : '';
// 参与运算的密匙
$cryptkey = $keya . md5($keya . $keyc);
$key_length = strlen($cryptkey);
// 明文，前 10 位用来保存时间戳，解密时验证数据有效性，10 到 26 位用来保存$keyb(密匙 b)，
//解密时会通过这个密匙验证数据完整性
// 如果是解码的话，会从第$ckey_length 位开始，因为密文前$ckey_length 位保存 动态密匙，以保证解密正确
$string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) :
sprintf('0d', $expiry ? $expiry time() : 0) . substr(md5($string . $keyb), 0, 16) . $string;
$string_length = strlen($string);
$result = '';
$box = range(0, 255);
$rndkey = array();
// 产生密匙簿
for ($i = 0; $i <= 255; $i ) {
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
}
// 用固定的算法，打乱密匙簿，增加随机性，好像很复杂，实际上对并不会增加密文的强度
for ($j = $i = 0; $i < 256; $i ) {
$j = ($j $box[$i] $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
// 核心加解密部分
for ($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;
// 从密匙簿得出密匙进行异或，再转成字符
$result .= chr(ord($string[$i]) ^ ($box[($box[$a] $box[$j]) % 256]));
}
if ($operation == 'DECODE') {
// 验证数据有效性，请看未加密明文的格式
if ((substr($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 {
// 把动态密匙保存在密文里，这也是为什么同样的明文，生产不同密文后能解密的原因
// 因为加密后的密文可能是一些特殊字符，复制过程可能会丢失，所以用 base64 编码
return $keyc . str_replace('=', '', base64_encode($result));
}
}
$str = 'blog.kieng.cn';
$key = '123465';
$authcode = authcode($str, 'ENCODE', $key, 0); //加密
echo "authcode 加密:";
echo "<br>";
echo $authcode;
echo "<br>";
echo authcode($authcode, 'DECODE', $key); //解密
echo "<hr>";
/**
* @FunctionName 自定义加密
* @Author KIENG
* @CompletionDate 2019-08-16T14:19:33 0800
* @Copyright [blog.kieng.cn]
* @License [BY-NC-SA/4.0/CN]
* @param string $tex [等待加密的文本]
* @param string $key [密匙]
* @param string $type [解密/加密]
* @return string [description]
*/
function encode_pass($tex, $key = '123456', $type = "encode") {
$chrArr = array('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9');
if ($type == "decode") {
if (strlen($tex) < 14) {
return false;
}
$verity_str = substr($tex, 0, 8);
$tex = substr($tex, 8);
if ($verity_str != substr(md5($tex), 0, 8)) {
//完整性验证失败
return false;
}
}
$key_b = $type == "decode" ? substr($tex, 0, 6) : $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62] . $chrArr[rand() % 62];
$rand_key = $key_b . $key;
$rand_key = md5($rand_key);
$tex = $type == "decode" ? base64_decode(substr($tex, 6)) : $tex;
$texlen = strlen($tex);
$reslutstr = "";
for ($i = 0; $i < $texlen; $i ) {
$reslutstr .= $tex{$i} ^ $rand_key{$i % 32};
}
if ($type != "decode") {
$reslutstr = trim($key_b . base64_encode($reslutstr), "==");
$reslutstr = substr(md5($reslutstr), 0, 8) . $reslutstr;
}
return $reslutstr;
}
$str = 'blog.kieng.cn';
$key = '123465';
$enpass = encode_pass($str, $key); //加密
echo "自定义加密:";
echo "<br>";
echo $enpass;
echo "<br>";
echo encode_pass($enpass, $key, 'decode'); //解密
echo "<hr>";
/*************自定义加密二***************/
/**
* @param $data 要加密的字符串
* @param $key 密钥
* @return string
*/
function encrypt($data, $key = 'encrypt') {
$key = md5($key);
$x = 0;
$len = strlen($data);
$l = strlen($key);
$char = '';
for ($i = 0; $i < $len; $i ) {
if ($x == $l) {
$x = 0;
}
$char .= $key{$x};
$x ;
}
$str = '';
for ($i = 0; $i < $len; $i ) {
$str .= chr(ord($data{$i}) (ord($char{$i})) % 256);
}
return base64_encode($str);
}
/**
* @param $data 要解密的字符串
* @param $key 密钥
* @return string
*/
function decrypt($data, $key = 'encrypt') {
$key = md5($key);
$x = 0;
$data = base64_decode($data);
$len = strlen($data);
$l = strlen($key);
$char = '';
for ($i = 0; $i < $len; $i ) {
if ($x == $l) {
$x = 0;
}
$char .= substr($key, $x, 1);
$x ;
}
$str = '';
for ($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;
}
$str = 'blog.kieng.cn';
$key = '123465';
$encode = encrypt($str);
echo "自定义加密二:";
echo "<br>";
echo $encode;
echo "<br>";
$decode = decrypt($encode);
echo $decode; // 加密字符串
echo "<hr>";
/*************自定义加密 4****************/
/**
* @param $string 要加密/解密的字符串
* @param $operation 类型，E 加密；D 解密
* @param string $key 密钥
* @return mixed|string
*/
function encrypts($string, $operation, $key = 'encrypt') {
$key = md5($key);
$key_length = strlen($key);
$string = $operation == 'D' ? base64_decode($string) : substr(md5($string . $key), 0, 8) . $string;
$string_length = strlen($string);
$rndkey = $box = array();
$result = '';
for ($i = 0; $i <= 255; $i ) {
$rndkey[$i] = ord($key[$i % $key_length]);
$box[$i] = $i;
}
for ($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 ($operation == 'D') {
if (substr($result, 0, 8) == substr(md5(substr($result, 8) . $key), 0, 8)) {
return substr($result, 8);
} else {
return '';
}
} else {
return str_replace('=', '', base64_encode($result));
}
}
$str = 'blog.kieng.cn';
$key = '123465';
$encode = encrypts($str, 'E');
echo "自定义加密三:";
echo "<br>";
echo $encode;
echo "<br>";
$decode = encrypts($encode, 'D');
echo $decode; // 加密字符串
echo "<hr>";
