Sharing of 2 more classic PHP encryption and decryption functions

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Sharing of 2 more classic PHP encryption and decryption functions_PHP Tutorial

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Jul 13, 2016 am 10:26 AM

phpfunctionencrypt and decodeclassic

Sometimes in the project we need to use PHP to encrypt specific information, that is, to generate an encrypted string through the encryption algorithm. This encrypted string can be decrypted through the decryption algorithm to facilitate the program to process the decrypted information. .
The most common applications are in user login and some API data exchange scenarios.

The author has collected some classic PHP encryption and decryption function codes to share with you. The principle of encryption and decryption is generally to use a certain encryption and decryption algorithm, add the key to the algorithm, and finally obtain the encryption and decryption results.
1. Very powerful authcode encryption function, Discuz! Classic code (with detailed explanation):

Copy code The code is as follows:

$string in function authcode($string, $operation, $key, $expiry): string, plaintext or ciphertext; $operation: DECODE means decryption, others means encryption; $key: secret key; $expiry : The validity period of the ciphertext.

Usage:

Copy code The code is as follows:

$str = 'abcdef';
$key = 'www.helloweba.com';
echo authcode($str,'ENCODE',$key,0); //Encryption
$str = '56f4yER1DI2WTzWMqsfPpS9hwyoJnFP2MpC8SOhRrxO7BOk';
echo authcode($str,'DECODE',$key,0); //Decrypt

2. Encryption and decryption function encrypt():

Copy code The code is as follows:

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                $rndkey[$i]=ord($key[$i%$key_length]);
         $box[$i]=$i;
}
for($j=$i=0;$i           $j=($j+$box[$i]+$rndkey[$i])%256;
          $tmp=$box[$i];
         $box[$i]=$box[$j];
          $box[$j]=$tmp;
}
for($a=$j=$i=0;$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));
}
}

In function encrypt($string,$operation,$key), $string: the string that needs to be encrypted and decrypted; $operation: determine whether to encrypt or decrypt, E means encryption, D means decryption; $key: key.

Usage:

Copy code The code is as follows:

$str = 'abc';
$key = 'www.helloweba.com';
$token = encrypt($str, 'E', $key);
echo 'Encryption:'.encrypt($str, 'E', $key);
echo 'Decrypt:'.encrypt($str, 'D', $key);

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