1. Discuz authcode
<?php /** * $string 明文或密文 * $operation 加密ENCODE或解密DECODE * $key 密钥 * $expiry 密钥有效期 */ 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 // 加入随机密钥,可以令密文无任何规律,即便是原文和密钥完全相同,加密结果也会每次不同,增大破解难度。 // 取值越大,密文变动规律越大,密文变化 = 16 的 $ckey_length 次方 // 当此值为 0 时,则不产生随机密钥 $ckey_length = 4 ; // 密匙 // $GLOBALS['discuz_auth_key'] 这里可以根据自己的需要修改 $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( $operation == 'DECODE' ) { // substr($result, 0, 10) == 0 验证数据有效性 // substr($result, 0, 10) - time() > 0 验证数据有效性 // substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16) 验证数据完整性 // 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 )); } } $a = "www.test.com" ; $b = authcode ( $a , "ENCODE" , "abc123" ); echo $b . "<br/>" ; echo authcode ( $b , "DECODE" , "abc123" );
2. 简单对称加密算法
<?php /** * 简单对称加密算法之加密 * @param String $string 需要加密的字串 * @param String $skey 加密EKY * @author Anyon Zou <[email protected]> * @date 2013-08-13 19:30 * @update 2014-10-10 10:10 * @return String */ function encode ( $string = '' , $skey = 'cxphp' ) { $strArr = str_split ( base64_encode ( $string )); $strCount = count ( $strArr ); foreach ( str_split ( $skey ) as $key => $value ) $key < $strCount && $strArr [ $key ].= $value ; return str_replace (array( '=' , '+' , '/' ), array( 'O0O0O' , 'o000o' , 'oo00o' ), join ( '' , $strArr )); } /** * 简单对称加密算法之解密 * @param String $string 需要解密的字串 * @param String $skey 解密KEY * @author Anyon Zou <[email protected]> * @date 2013-08-13 19:30 * @update 2014-10-10 10:10 * @return String */ function decode ( $string = '' , $skey = 'cxphp' ) { $strArr = str_split ( str_replace (array( 'O0O0O' , 'o000o' , 'oo00o' ), array( '=' , '+' , '/' ), $string ), 2 ); $strCount = count ( $strArr ); foreach ( str_split ( $skey ) as $key => $value ) $key <= $strCount && isset( $strArr [ $key ]) && $strArr [ $key ][ 1 ] === $value && $strArr [ $key ] = $strArr [ $key ][ 0 ]; return base64_decode ( join ( '' , $strArr )); } echo '<pre>' ; $str = '56,15123365247,54,四大古典风格' ; echo "string : " . $str . " <br />" ; echo "encode : " . ( $enstring = encode ( $str )) . '<br />' ; echo "decode : " . decode ( $enstring );
3. DES加密解密
<?php class DES { public $key ; public $iv ; //偏移量 function __construct ( $key , $iv = 0 ){ $this -> key = $key ; if( $iv == 0 ){ $this -> iv = $key ; }else{ $this -> iv = $iv ; } } //加密 function encrypt ( $str ){ $size = mcrypt_get_block_size ( MCRYPT_DES , MCRYPT_MODE_CBC ); $str = $this -> pkcs5Pad ( $str , $size ); $data = mcrypt_cbc ( MCRYPT_DES , $this -> key , $str , MCRYPT_ENCRYPT , $this -> iv ); //$data=strtoupper(bin2hex($data)); //返回大写十六进制字符串 return base64_encode ( $data ); } //解密 function decrypt ( $str ){ $str = base64_decode ( $str ); //$strBin = $this->hex2bin( strtolower($str)); $str = mcrypt_cbc ( MCRYPT_DES , $this -> key , $str , MCRYPT_DECRYPT , $this -> iv ); $str = $this -> pkcs5Unpad ( $str ); return $str ; } function hex2bin ( $hexData ){ $binData = "" ; for( $i = 0 ; $i < strlen ( $hexData ); $i += 2 ){ $binData .= chr ( hexdec ( substr ( $hexData , $i , 2 ))); } return $binData ; } function pkcs5Pad ( $text , $blocksize ){ $pad = $blocksize - ( strlen ( $text ) % $blocksize ); return $text . str_repeat ( chr ( $pad ), $pad ); } function pkcs5Unpad ( $text ){ $pad = ord ( $text { strlen ( $text ) - 1 } ); if ( $pad > strlen ( $text )) return false ; if ( strspn ( $text , chr ( $pad ), strlen ( $text ) - $pad ) != $pad ) return false ; return substr ( $text , 0 , - 1 * $pad ); } } $str = 'abc' ; $key = '12345678' ; //8位内 $crypt = new DES ( $key ); $mstr = $crypt -> encrypt ( $str ); $str = $crypt -> decrypt ( $mstr ); echo $str . ' <=> ' . $mstr ;
4. PHP hex2bin
<?php function hexXbin ( $data , $types = false ){ if(! is_string ( $data )) return 0 ; if( $types === false ){ $len = strlen ( $data ); if ( $len % 2 ) { return 0 ; }else if ( strspn ( $data , '0123456789abcdefABCDEF' ) != $len ) { return 0 ; } return pack ( 'H*' , $data ); }else{ return bin2hex ( $data ); } } echo $t = hexXbin ( 'XN中国人( ADdwere)zQ4MzUwOTcy==' , true ); echo '<br />' ; echo hexXbin ( $t );