Encryption and Decryption Function in PHP and DES Encryption and Decryption Example

This article describes the example of PHP encryption and decryption functions and DES encryption and decryption applications, to share for your reference. The details are as follows:

Example, php encryption and decryption example

Encryption function:

/*

* Function: Encrypt the string 

* Parameter 1 Content that needs to be encrypted 

* Parameter 2 : Key 

*/

function passport_encrypt($str,$key){ // Encryption function 

 srand((double)microtime() * 1000000);

 $encrypt_key=md5(rand(0, 32000));

 $ctr=0;

 $tmp='';

 for($i=0;$i<strlen($str);$i++){

  $ctr=$ctr==strlen($encrypt_key)?0:$ctr;

  $tmp.=$encrypt_key[$ctr].($str[$i] ^ $encrypt_key[$ctr++]);

 }

 return base64_encode(passport_key($tmp,$key));

}

The decryption code is as follows:

/*

* Function: Decrypt the string 

* Parameter 1 Ciphertext to be decrypted 

* Parameter 2 : Key 

*/

function passport_decrypt($str,$key){ // Decryption function 

 $str=passport_key(base64_decode($str),$key);

 $tmp='';

 for($i=0;$i<strlen($str);$i++){

  $md5=$str[$i];

  $tmp.=$str[++$i] ^ $md5;

 }

 return $tmp;

}

Helper function:

/*

* Auxiliary function 

*/

function passport_key($str,$encrypt_key){

 $encrypt_key=md5($encrypt_key);

 $ctr=0;

 $tmp='';

 for($i=0;$i<strlen($str);$i++){

  $ctr=$ctr==strlen($encrypt_key)?0:$ctr;

  $tmp.=$str[$i] ^ $encrypt_key[$ctr++];

 }

 return $tmp;

}

Use the following

$str=' By: www.ofstack.com';

$key='123456';

$encrypt=passport_encrypt($str,$key);

$decrypt=passport_decrypt($encrypt,$key);

echo ' Original: ',$str."<br><hr>";

echo ' Ciphertext: ',$encrypt."<br><hr>";

echo ' Translation: ',$decrypt."<br><hr>";

The specific code of DES encryption and decryption function is as follows:

<?php

class DES

{

 var $key;

 var $iv; // Offset 

 

 function DES( $key, $iv=0 ) {

 //key Length 8 For example :1234abcd

  $this->key = $key;

  if( $iv == 0 ) {

   $this->iv = $key;

  } else {

   $this->iv = $iv; //mcrypt_create_iv ( mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM );

  }

 }

 

 function encrypt($str) {

 // Encrypt, return uppercase 106 Binary string 

  $size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );

  $str = $this->pkcs5Pad ( $str, $size );

  return strtoupper( bin2hex( mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv ) ) );

 }

 

 function decrypt($str) {

 // Decryption 

  $strBin = $this->hex2bin( strtolower( $str ) );

  $str = mcrypt_cbc( MCRYPT_DES, $this->key, $strBin, 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 );

 }

}

?>

Here are the test results:

$str = '12345678';

$key = '1234abcd';

$crypt = new DES($key);

$mstr = $crypt->encrypt($str);

$str = $crypt->decrypt($mstr);

echo  $str.' <=> '.$mstr;

Example 2

The code is as follows:

/**

* Encryption needs to pass get The way is in url Parameters passed in 

*/

function args_encode($data) {

if(is_array($data)) {

$string = http_build_query($data);

return base64_encode($string);

} else {

return false;

}

}
/**

* Get url Medium get Parameters passed in the mode 

*/

function getargs() {

$string = base64_decode($_GET['args']);

parse_str($string,$g);

return $g;

}

PS: About encryption technology, this site also provides the following encryption tools for your reference:

MD5 Online Encryption Tool: http://tools.ofstack.com/password/CreateMD5Password

Escape Encryption/Decryption Tool: http://tools.ofstack.com/password/escapepwd

Online SHA1 encryption tool: http://tools.ofstack.com/password/sha1encode

Short chain (short website) online generation tool: http://tools.ofstack.com/password/dwzcreate

Short chain (short website) online restoration tool: http://tools.ofstack.com/password/unshorturl

High strength cryptographic generator: http://tools.ofstack.com/password/CreateStrongPassword

I hope this article is helpful to everyone's PHP programming.