六种php加密解密方法实例讲解

代码演示如下：

方法一

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<?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); ?>

方法二

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<?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

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<?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

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<?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>" ;   ?>

方法五

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<?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

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<?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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原文链接：https://blog.csdn.net/liuxingjiaoyuC/article/details/109381956