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
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<?php /** * 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
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<?php //加密函数 function lock_url($txt,$key='mrdede.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='mrdede.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($tmp); } ?> |
用户密码可逆加密解密函数:
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<?php function passport_encrypt($txt, $key = 'mrdede.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 = 'mrdede.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:
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<?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:
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<?php $string = "Helloworld"; echo $str1 = dencrypt($string, true, "mrdede.com"); echo $str2 = dencrypt($str1, false, "mrdede.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:
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<?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; } ?> |