标签 PHP 下的文章 - 学习笔记

PHP对字符串的六种加密解密方法 方法一、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 $encrypted; } } //加密:"z0JAx4qMwcF+db5TNbp/xwdUM84snRsXvvpXuaCa4Bk=" echo encryptDecrypt('password', 'Helloweba欢迎您', 0); //解密:"Helloweba欢迎您" echo encryptDecrypt('password', 'z0JAx4qMwcF+db5TNbp/xwdUM84snRsXvvpXuaCa4Bk=', 1);方法二、//加密函数 function lock_url($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($tmp); }方法三、改进后的算法//加密函数 function lock_url($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), $key); }方法四、function passport_encrypt($txt, $key = 'liiu') { srand((float)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 $decrypt . "<br>";方法五、非常给力的authcode加密函数，Discuz!经典代码（带详解）//函数authcode($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、/** * $string：需要加解密的字符串； * $operation：E表示加密，D表示解密； * $key：自定义密匙 */ function string($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)); } }