六种php加密解密方法实例讲解

代码演示如下：

方法一

<?phpfunction encryptDecrypt($key, $string, $decrypt){if($decrypt){$decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($string), MCRYPT_MODE_CBC, md5(md5($key))), \"12\");return $decrypted;}else{$encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key))));return $encrypted;}}//加密:\"z0JAx4qMwcF+db5TNbp/xwdUM84snRsXvvpXuaCa4Bk=\"echo encryptDecrypt(\'password\', \'Helloweba欢迎您\',0);//解密:\"Helloweba欢迎您\"echo encryptDecrypt(\'password\', \'z0JAx4qMwcF+db5TNbp/xwdUM84snRsXvvpXuaCa4Bk=\',1);?>

方法二

<?php//加密函数function lock_url($txt,$key=\'liiu\'){$chars = \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+\";$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=\'liiu\'){$txt = urldecode($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);}?>

方法三

<?php//改进后的算法//加密函数function lock_url($txt,$key=\'str\'){$txt = $txt.$key;$chars = \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+\";$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(base64_encode($ch.$tmp));}//解密函数function unlock_url($txt,$key=\'str\'){$txt = base64_decode(urldecode($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 trim(base64_decode($tmp),$key);}?>

方法四

<?phpfunction passport_encrypt($txt, $key = \'liiu\') {srand((double)microtime() * 1000000);$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, $key = \'liiu\') {$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 $tmp;}$txt = \"1\";$key = \"testkey\";$encrypt = passport_encrypt($txt,$key);$decrypt = passport_decrypt($encrypt,$key);echo $encrypt.\"<br>\";echo $decrypt.\"<br>\";?>

方法五

<?php//非常给力的authcode加密函数,Discuz!经典代码(带详解)//函数authcode($string, $operation, $key, $expiry)中的$string：字符串，明文或密文；$operation：DECODE表示解密，其它表示加密；$key：密匙；$expiry：密文有效期。function authcode($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(\'%010d\', $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));}}$str = \'abcdef\';$key = \'www.helloweba.com\';echo authcode($str,\'ENCODE\',$key,0); //加密$str = \'56f4yER1DI2WTzWMqsfPpS9hwyoJnFP2MpC8SOhRrxO7BOk\';echo authcode($str,\'DECODE\',$key,0); //解密?>

方法六

<?php//函数encrypt($string,$operation,$key)中$string：需要加密解密的字符串；$operation：判断是加密还是解密，E表示加密，D表示解密；$key：密匙。function encrypt($string,$operation,$key=\'\'){$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 = \'abc\';$key = \'www.helloweba.com\';$token = encrypt($str, \'E\', $key);echo \'加密:\'.encrypt($str, \'E\', $key);echo \'解密：\'.encrypt($str, \'D\', $key);?>

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