本文實例講述了php實現的三個常用加密解密功能函數。分享給大家供大家參考，具體如下：
算法一：
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//加密函數function lock_url($txt,$key='www.jfrwli.cn'){ $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);}//解密函數function unlock_url($txt,$key='www.jfrwli.cn'){ $txt = urldecode($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($tmp);} |
用法：
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$str="服務器之家";$pwd = lock_url($str);echo "加密之后：".$pwd."<br/>";echo "解密還原：".unlock_url($pwd); |
運行結果：
算法二：
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<?phpfunction passport_encrypt($txt, $key = 'www.jfrwli.cn') { 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.jfrwli.cn') { $txt = passport_key(base64_decode(urldecode($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 $tmp; } ?> |
用法：
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<?php$txt = "1";$key = "testkey";$encrypt = passport_encrypt($txt,$key);$decrypt = passport_decrypt($encrypt,$key);echo $encrypt."<br>";echo $decrypt."<br>";?> |
運行結果：
算法三（改進第一個加密之后的算法）
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//加密函數function lock_url($txt,$key='www.jfrwli.cn'){ $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));}//解密函數function unlock_url($txt,$key='www.jfrwli.cn'){ $txt = base64_decode(urldecode($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);} |
用法：
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$str="服務器之家";$pwd = lock_url($str);echo "加密之后：".$pwd."<br/>";echo "解密還原：".unlock_url($pwd); |
運行結果：
ps：關于加密解密感興趣的朋友還可以參考本站在線工具：
文字在線加密解密工具（包含aes、des、rc4等）：https://tool.zzvips.com/t/txtencode/
md5在線加密工具:https://tool.zzvips.com/t/md5/
在線sha1/sha224/sha256/sha384/sha512加密工具：https://tool.zzvips.com/t/sha/
希望本文所述對大家php程序設計有所幫助。
原文鏈接：http://www.cnblogs.com/zqifa/p/php-8.html
