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
1 /**
2 * 加密
3 * @param string $string 要加密或解密的字符串
4 * @param string $operation 加密 ‘‘ 解密 DECODE
5 * @param string $key 密钥，加密解密时保持一致
6 * @param int $expiry 有效时长，单位：秒
7 * @return string
8 */
9 function encrypt_code($string, $expiry = 0, $key = ‘abc12345‘) {
10 $ckey_length = 7;
11 $key = md5($key ? $key : UC_KEY); //加密解密时这个是不变的
12 $keya = md5(substr($key, 0, 16)); //加密解密时这个是不变的
13 $keyb = md5(substr($key, 16, 16)); //加密解密时这个是不变的
14 $keyc = $ckey_length ? substr(md5(microtime()), -$ckey_length) : ‘‘;
15 $cryptkey = $keya . md5($keya . $keyc); //64
16 $key_length = strlen($cryptkey); //64
17
18 $string =sprintf(‘%010d‘, $expiry ? $expiry + time() : 0) . substr(md5($string . $keyb), 0, 16) . $string;
19 $string_length = strlen($string);
20
21 $result = ‘‘;
22 $box = range(0, 255);
23
24 $rndkey = array();
25 for ($i = 0; $i <= 255; $i++) { //字母表 64位后重复 数列 范围为48~122
26 $rndkey[$i] = ord($cryptkey[$i % $key_length]);
27 }
28
29 for ($j = $i = 0; $i < 256; $i++) { //这里是一个打乱算法
30 $j = ($j + $box[$i] + $rndkey[$i]) % 256;
31 $tmp = $box[$i];
32 $box[$i] = $box[$j];
33 $box[$j] = $tmp;
34 }
35 for ($a = $j = $i = 0; $i < $string_length; $i++) {
36 $result .= chr(ord($string[$i]) ^ ($box[$i]));
37
38 }
39 $str = $keyc . str_replace(‘=‘, ‘‘, urlsafe_b64encode($result));
40 // $str =htmlentities($str, ENT_QUOTES, "UTF-8"); // curl 访问出错
41 return $str ;
42 }
43
44
45 /**
46 * 解密
47 * @param string $string 要加密或解密的字符串
48 * @param string $operation 加密 ‘‘ 解密 DECODE
49 * @param string $key 密钥，加密解密时保持一致
50 * @param int $expiry 有效时长，单位：秒
51 * @return string
52 */
53 function encrypt_decode($string, $expiry = 0,$key = ‘abc12345‘) {
54 // $string = html_entity_decode($string, ENT_QUOTES, "UTF-8") ; //curl 访问出错
55 $ckey_length = 7;
56 $key = md5($key ? $key : UC_KEY); //加密解密时这个是不变的
57 $keya = md5(substr($key, 0, 16)); //加密解密时这个是不变的
58 $keyb = md5(substr($key, 16, 16)); //加密解密时这个是不变的
59
60 $keyc = $ckey_length ? substr($string, 0, $ckey_length) : ‘‘;
61
62 $cryptkey = $keya . md5($keya . $keyc); //64
63 $key_length = strlen($cryptkey); //64
64 $string = urlsafe_b64decode(substr($string, $ckey_length)) ;
65 $string_length = strlen($string);
66 $result = ‘‘;
67 $box = range(0, 255);
68
69 $rndkey = array();
70 for ($i = 0; $i <= 255; $i++) { //字母表 64位后重复 数列 范围为48~122
71 $rndkey[$i] = ord($cryptkey[$i % $key_length]);
72 }
73 for ($j = $i = 0; $i < 256; $i++) { //这里是一个打乱算法
74 $j = ($j + $box[$i] + $rndkey[$i]) % 256;
75
76 $tmp = $box[$i];
77 $box[$i] = $box[$j];
78 $box[$j] = $tmp;
79 }
80 for ($a = $j = $i = 0; $i < $string_length; $i++) {
81 $result .= chr(ord($string[$i]) ^ ($box[$i]));
82 }
83 if ((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26) . $keyb), 0, 16)) {
84 return substr($result, 26);
85 } else {
86 return false;
87 }
88
89 }
最简单的往往是最好用的。
URL加密解密函数
1 //加密函数
2 function lock_url($txt,$key=‘www.zhuoyuexiazai.com‘){
3 $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
4 $nh = rand(0,64);
5 $ch = $chars[$nh];
6 $mdKey = md5($key.$ch);
7 $mdKey = substr($mdKey,$nh%8, $nh%8+7);
8 $txt = base64_encode($txt);
9 $tmp = ‘‘;
10 $i=0;$j=0;$k = 0;
11 for ($i=0; $i<strlen($txt); $i++) {
12 $k = $k == strlen($mdKey) ? 0 : $k;
13 $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;
14 $tmp .= $chars[$j];
15 }
16 return urlencode($ch.$tmp);
17 }
18 //解密函数
19 function unlock_url($txt,$key=‘www.zhuoyuexiazai.com‘){
20 $txt = urldecode($txt);
21 $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
22 $ch = $txt[0];
23 $nh = strpos($chars,$ch);
24 $mdKey = md5($key.$ch);
25 $mdKey = substr($mdKey,$nh%8, $nh%8+7);
26 $txt = substr($txt,1);
27 $tmp = ‘‘;
28 $i=0;$j=0; $k = 0;
29 for ($i=0; $i<strlen($txt); $i++) {
30 $k = $k == strlen($mdKey) ? 0 : $k;
31 $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);
32 while ($j<0) $j+=64;
33 $tmp .= $chars[$j];
34 }
35 return base64_decode($tmp);
36 }
用户密码可逆加密解密函数：
1 <?php
2 function passport_encrypt($txt, $key = ‘www.zhuoyuexiazai.com‘) {
3 srand((double)microtime() * 1000000);
4 $encrypt_key = md5(rand(0, 32000));
5 $ctr = 0;
6 $tmp = ‘‘;
7 for($i = 0;$i < strlen($txt); $i++) {
8 $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
9 $tmp .= $encrypt_key[$ctr].($txt[$i] ^ $encrypt_key[$ctr++]);
10 }
11 return urlencode(base64_encode(passport_key($tmp, $key)));
12 }
13
14 function passport_decrypt($txt, $key = ‘www.zhuoyuexiazai.com‘) {
15 $txt = passport_key(base64_decode(urldecode($txt)), $key);
16 $tmp = ‘‘;
17 for($i = 0;$i < strlen($txt); $i++) {
18 $md5 = $txt[$i];
19 $tmp .= $txt[++$i] ^ $md5;
20 }
21 return $tmp;
22 }
23
24 function passport_key($txt, $encrypt_key) {
25 $encrypt_key = md5($encrypt_key);
26 $ctr = 0;
27 $tmp = ‘‘;
28 for($i = 0; $i < strlen($txt); $i++) {
29 $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
30 $tmp .= $txt[$i] ^ $encrypt_key[$ctr++];
31 }
32 return $tmp;
33 }
34 ?>
测试方法：
1 <?php 2 $txt = "1"; 3 $key = "testkey"; 4 $encrypt = passport_encrypt($txt,$key); 5 $decrypt = passport_decrypt($encrypt,$key); 6 7 echo $encrypt."<br>"; 8 echo $decrypt."<br>"; 9 ?>
SHA1的可逆加密解密函数：
1 <?php
2 $string = "Helloworld";
3 echo $str1 = dencrypt($string, true, "www.miaohr.com");
4 echo $str2 = dencrypt($str1, false, "www.miaohr.com");
5
6 function dencrypt($string, $isEncrypt = true, $key = KEY_SPACE) {
7 if (!isset($string{0}) || !isset($key{0})) {
8 return false;
9 }
10
11 $dynKey = $isEncrypt ? hash(‘sha1‘, microtime(true)) : substr($string, 0, 40);
12 $fixedKey = hash(‘sha1‘, $key);
13
14 $dynKeyPart1 = substr($dynKey, 0, 20);
15 $dynKeyPart2 = substr($dynKey, 20);
16 $fixedKeyPart1 = substr($fixedKey, 0, 20);
17 $fixedKeyPart2 = substr($fixedKey, 20);
18 $key = hash(‘sha1‘, $dynKeyPart1 . $fixedKeyPart1 . $dynKeyPart2 . $fixedKeyPart2);
19
20 $string = $isEncrypt ? $fixedKeyPart1 . $string . $dynKeyPart2 : (isset($string{339}) ? gzuncompress(base64_decode(substr($string, 40))) : base64_decode(substr($string, 40)));
21
22 $n = 0;
23 $result = ‘‘;
24 $len = strlen($string);
25
26 for ($n = 0; $n < $len; $n++) {
27 $result .= chr(ord($string{$n}) ^ ord($key{$n % 40}));
28 }
29 return $isEncrypt ? $dynKey . str_replace(‘=‘, ‘‘, base64_encode($n > 299 ? gzcompress($result) : $result)) : substr($result, 20, -20);
30 }
31
32 ?>
DES的加密解密函数：
1 <?php
2
3 $input =‘http://mlaan2.home.xs4all.nl/ispack/isetup-5.5.3.exe‘;
4 /**
5 *加密函数
6 *$input 要被加密的字符串
7 *$key 密钥
8 */
9
10 $key = randomkeys(8);//生成随机密匙
11 function do_mencrypt($input, $key)
12 {
13 $input = base64_encode(trim($input));
14 //$key = substr(md5($key), 0, 4);
15 $td = mcrypt_module_open(‘des‘, ‘‘, ‘ecb‘, ‘‘);
16 $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
17 mcrypt_generic_init($td, $key, $iv);
18 $encrypted_data = mcrypt_generic($td, $input);
19 mcrypt_generic_deinit($td);
20 mcrypt_module_close($td);
21 return trim(base64_encode($encrypted_data));
22 }
23 print_r(do_mencrypt($input, $key));
24 echo "<br/>";
25 /**
26 *解密函数
27 *$input 要被解密的字符串
28 *$key 密钥
29 */
30 $input1 = do_mencrypt($input, $key);
31 function do_mdecrypt($input1, $key)
32 {
33 $input1 = base64_decode(trim($input1));
34 $td = mcrypt_module_open(‘des‘, ‘‘, ‘ecb‘, ‘‘);
35 //$key = substr(md5($key), 0, 4);
36 $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
37 mcrypt_generic_init($td, $key, $iv);
38 $decrypted_data = mdecrypt_generic($td, $input1);
39 mcrypt_generic_deinit($td);
40 mcrypt_module_close($td);
41 return trim(base64_decode($decrypted_data));
42 }
43 print_r(do_mdecrypt($input1, $key));
44
45 #2.rand key: "CWSTOAYD"：生成随机密匙，统一用字母或者数字，长度为8.
46 function randomkeys($length)
47 {
48 $pattern = ‘1234567890‘;
49 for($i=0;$i<$length;$i++)
50 {
51 @$key .= $pattern{rand(0,9)}; //生成php随机数
52 }
53 return $key;
54 }
55 ?>
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时间： 2024-10-13 15:58:01