The most secure forward and reverse encryption and decryption functions in PHP history

The most secure forward and reverse encryption and decryption functions in PHP history_PHP Tutorial

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Release： 2016-07-21 14:58:35

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I have written an article about encryption and decryption before, and it can be used casually. Now for safety, I wrote a forward and reverse encryption and decryption function of triple des (3DES) in PHP. 3DES is recognized as the most secure encryption. Decryption function, but unfortunately PHP does not provide such a ready-made function, so I wrote a 3DES version of the method. There are many versions of 3DES. This version uses ECB mode, using PKCS7 complement and base64 as ciphertext. The security level is high. Generally, when using this function, you only need to modify the key.

Test:
echo (des3crypt( "龙哥blog",'ENCODE'));
echo "
";
echo (des3crypt( "bxC46TETFEZFpTS1DClzpg==",'DECODE' ));
echo “
“;

/**
* Encryption and decryption function
* @param $str
* @param $type
* @param $key
*/
function des3crypt($str,$type = 'ENCODE',$key = 'AXNU7SLKJ7HKJm+x4bfBJSJQKde'){
if(empty($str) && $str != 0){
return false;
}
$td = mcrypt_module_open( MCRYPT_3DES, ”, MCRYPT_MODE_ECB, ”);
$key = base64_decode($key);
mcrypt_generic_init($ td, $key,'12345678′);
if(strtoupper($type) == 'ENCODE'){
$str = padding( $str );
$data = mcrypt_generic($td, $str);
}elseif(strtoupper($type) == 'DECODE'){
$str = base64_decode($str);
$data = mdecrypt_generic($td, $str);
}
//Encryption
mcrypt_generic_deinit($td);
//End
mcrypt_module_close($td);
if(strtoupper($type) == 'ENCODE'){
$data = removeBR(base64_encode($data));
}elseif(strtoupper($type) == 'DECODE'){
$data = removePadding($data);
}
return $data;
}

//Remove padding
function removePadding( $str ){
$len = strlen( $str );
$newstr = “”;
$str = str_split($str) ;
for ($i = 0; $i < $len; $i++ ){
if (!in_array($str[$i],array(chr(0),chr(1),chr (2),chr(3),chr(4),chr(5),chr(6),chr(7),chr(8)))){
$newstr .= $str[$i] ;
}
}
return $newstr;
}

//Padding password to a multiple of 8, pkcs7 | pkcs5
function padding( $str ,$pkcs = 5){
if($pkcs == 5){
$pad = 8 – (strlen($str) % 8);
$str .= str_repeat(chr($pad), $pad);
}elseif($pkcs == 7){
$len = 8 – strlen( $str ) % 8;
for ( $i = 0; $i < $len; $i++ ){
$str .= chr( 0 );
}
}
return $str ;
}

//Remove carriage returns and line feeds
function removeBR( $str ){
$len = strlen( $str );
$newstr = “”;
$str = str_split($ str);
for ($i = 0; $i < $len; $i++ ){
if ($str[$i] != 'n' and $str[$i] != ' r'){
$newstr .= $str[$i];
}
}
return $newstr;
}

Article source: Long Ge’s blog Original text: http://www.52blogger.com/archives/821