原文:各种加密解密函数（URL加密解密、sha1加密解密、des加密解密）
普通hash函数如md5、sha1、base64等都是不可逆函数。虽然我们利用php可以利用这些函数写出可逆函数来。但是跨语言时这类可逆函数非常难搞定。所以这时尽量使用AES DES RC4 Rabbit TripleDes这些方法。
包含超时的加密解密函数
/**
* 加密
* @param string $string 要加密或解密的字符串
* @param string $operation 加密 '' 解密 DECODE
* @param string $key 密钥，加密解密时保持一致
* @param int $expiry 有效时长，单位：秒
* @return string
*/
function encrypt_code($string, $expiry = 0, $key = 'abc12345') {
$ckey_length = 7;
$key = md5($key ? $key : UC_KEY); //加密解密时这个是不变的
$keya = md5(substr($key, 0, 16)); //加密解密时这个是不变的
$keyb = md5(substr($key, 16, 16)); //加密解密时这个是不变的
$keyc = $ckey_length ? substr(md5(microtime()), -$ckey_length) : '';
$cryptkey = $keya . md5($keya . $keyc); //64
$key_length = strlen($cryptkey); //64 $string =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++) { //字母表 64位后重复 数列 范围为48~122
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
} for ($j = $i = 0; $i < 256; $i++) { //这里是一个打乱算法
$j = ($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++) {
$result .= chr(ord($string[$i]) ^ ($box[$i])); }
$str = $keyc . str_replace('=', '', urlsafe_b64encode($result));
// $str =htmlentities($str, ENT_QUOTES, "UTF-8"); // curl 访问出错
return $str ;
} /**
* 解密
* @param string $string 要加密或解密的字符串
* @param string $operation 加密 '' 解密 DECODE
* @param string $key 密钥，加密解密时保持一致
* @param int $expiry 有效时长，单位：秒
* @return string
*/
function encrypt_decode($string, $expiry = 0,$key = 'abc12345') {
// $string = html_entity_decode($string, ENT_QUOTES, "UTF-8") ; //curl 访问出错
$ckey_length = 7;
$key = md5($key ? $key : UC_KEY); //加密解密时这个是不变的
$keya = md5(substr($key, 0, 16)); //加密解密时这个是不变的
$keyb = md5(substr($key, 16, 16)); //加密解密时这个是不变的 $keyc = $ckey_length ? substr($string, 0, $ckey_length) : ''; $cryptkey = $keya . md5($keya . $keyc); //64
$key_length = strlen($cryptkey); //64
$string = urlsafe_b64decode(substr($string, $ckey_length)) ;
$string_length = strlen($string);
$result = '';
$box = range(0, 255); $rndkey = array();
for ($i = 0; $i <= 255; $i++) { //字母表 64位后重复 数列 范围为48~122
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
}
for ($j = $i = 0; $i < 256; $i++) { //这里是一个打乱算法
$j = ($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++) {
$result .= chr(ord($string[$i]) ^ ($box[$i]));
}
if ((substr($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 false;
} }
最简单的往往是最好用的。
URL加密解密函数
//加密函数
function lock_url($txt,$key='www.zhuoyuexiazai.com'){
$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);
}
//解密函数
function unlock_url($txt,$key='www.zhuoyuexiazai.com'){
$txt = urldecode($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($tmp);
}
用户密码可逆加密解密函数：
<?php
function passport_encrypt($txt, $key = 'www.zhuoyuexiazai.com') {
srand((double)microtime() * 1000000);
$encrypt_key = md5(rand(0, 32000));
$ctr = 0;
$tmp = '';
for($i = 0;$i < strlen($txt); $i++) {
$ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
$tmp .= $encrypt_key[$ctr].($txt[$i] ^ $encrypt_key[$ctr++]);
}
return urlencode(base64_encode(passport_key($tmp, $key)));
} function passport_decrypt($txt, $key = 'www.zhuoyuexiazai.com') {
$txt = passport_key(base64_decode(urldecode($txt)), $key);
$tmp = '';
for($i = 0;$i < strlen($txt); $i++) {
$md5 = $txt[$i];
$tmp .= $txt[++$i] ^ $md5;
}
return $tmp;
} function passport_key($txt, $encrypt_key) {
$encrypt_key = md5($encrypt_key);
$ctr = 0;
$tmp = '';
for($i = 0; $i < strlen($txt); $i++) {
$ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
$tmp .= $txt[$i] ^ $encrypt_key[$ctr++];
}
return $tmp;
}
?>
测试方法：
<?php
$txt = "1";
$key = "testkey";
$encrypt = passport_encrypt($txt,$key);
$decrypt = passport_decrypt($encrypt,$key); echo $encrypt."<br>";
echo $decrypt."<br>";
?>
SHA1的可逆加密解密函数：
<?php
$string = "Helloworld";
echo $str1 = dencrypt($string, true, "www.miaohr.com");
echo $str2 = dencrypt($str1, false, "www.miaohr.com"); function dencrypt($string, $isEncrypt = true, $key = KEY_SPACE) {
if (!isset($string{0}) || !isset($key{0})) {
return false;
} $dynKey = $isEncrypt ? hash('sha1', microtime(true)) : substr($string, 0, 40);
$fixedKey = hash('sha1', $key); $dynKeyPart1 = substr($dynKey, 0, 20);
$dynKeyPart2 = substr($dynKey, 20);
$fixedKeyPart1 = substr($fixedKey, 0, 20);
$fixedKeyPart2 = substr($fixedKey, 20);
$key = hash('sha1', $dynKeyPart1 . $fixedKeyPart1 . $dynKeyPart2 . $fixedKeyPart2); $string = $isEncrypt ? $fixedKeyPart1 . $string . $dynKeyPart2 : (isset($string{339}) ? gzuncompress(base64_decode(substr($string, 40))) : base64_decode(substr($string, 40))); $n = 0;
$result = '';
$len = strlen($string); for ($n = 0; $n < $len; $n++) {
$result .= chr(ord($string{$n}) ^ ord($key{$n % 40}));
}
return $isEncrypt ? $dynKey . str_replace('=', '', base64_encode($n > 299 ? gzcompress($result) : $result)) : substr($result, 20, -20);
} ?>
DES的加密解密函数：
<?php
$input ='http://mlaan2.home.xs4all.nl/ispack/isetup-5.5.3.exe';
/**
*加密函数
*$input 要被加密的字符串
*$key 密钥
*/
$key = randomkeys(8);//生成随机密匙
function do_mencrypt($input, $key)
{
$input = base64_encode(trim($input));
//$key = substr(md5($key), 0, 4);
$td = mcrypt_module_open('des', '', 'ecb', '');
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
mcrypt_generic_init($td, $key, $iv);
$encrypted_data = mcrypt_generic($td, $input);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return trim(base64_encode($encrypted_data));
}
print_r(do_mencrypt($input, $key));
echo "<br/>";
/**
*解密函数
*$input 要被解密的字符串
*$key 密钥
*/
$input1 = do_mencrypt($input, $key);
function do_mdecrypt($input1, $key)
{
$input1 = base64_decode(trim($input1));
$td = mcrypt_module_open('des', '', 'ecb', '');
//$key = substr(md5($key), 0, 4);
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
mcrypt_generic_init($td, $key, $iv);
$decrypted_data = mdecrypt_generic($td, $input1);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return trim(base64_decode($decrypted_data));
}
print_r(do_mdecrypt($input1, $key));
#2.rand key: "CWSTOAYD"：生成随机密匙，统一用字母或者数字，长度为8.
function randomkeys($length)
{
$pattern = '1234567890';
for($i=0;$i<$length;$i++)
{
@$key .= $pattern{rand(0,9)}; //生成php随机数
}
return $key;
}
?>
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