记6种php 加密解密方法

<?php ?function 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); ??> ?

<?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); ?} ??> ?

<?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); ?} ??> 

<?php ?function 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>"; ???> ??

<?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 ???> 

<?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); ??> ?