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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