Encryption and decryption functions and DES encryption and decryption examples in PHP

The example in this article describes the application of encryption and decryption functions and DES encryption and decryption in PHP, and is shared with everyone for your reference. The details are as follows:

Example, PHP encryption and decryption example

Encryption function:

/*
*功能：对字符串进行加密处理
*参数一：需要加密的内容
*参数二：密钥
*/
function passport_encrypt($str,$key){ //加密函数
 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:

/*
*功能：对字符串进行解密处理
*参数一：需要解密的密文
*参数二：密钥
*/
function passport_decrypt($str,$key){ //解密函数
 $str=passport_key(base64_decode($str),$key);
 $tmp='';
 for($i=0;$i<strlen($str);$i++){
  $md5=$str[$i];
  $tmp.=$str[++$i] ^ $md5;
 }
 return $tmp;
}

Auxiliary function:

/*
*辅助函数
*/
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 as shown below

$key='123456';
$encrypt=passport_encrypt($str,$key);
$decrypt=passport_decrypt($encrypt,$key);
echo &#39;原文：&#39;,$str."<br><hr>";
echo &#39;密文：&#39;,$encrypt."<br><hr>";
echo &#39;译文：&#39;,$decrypt."<br><hr>";

DES encryption and decryption function specific code is as follows:

<?php
class DES
{
 var $key;
 var $iv; //偏移量
 
 function DES( $key, $iv=0 ) {
 //key长度8例如: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) {
 //加密，返回大写十六进制字符串
  $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) {
 //解密
  $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 );
 }
}
?>

The following are the test results:

$str = '12345678';
$key = '1234abcd';
$crypt = new DES($key);
$mstr = $crypt->encrypt($str);
$str = $crypt->decrypt($mstr);
echo  $str.&#39; <=> &#39;.$mstr;

Example 2

The code is as follows:

/**
*加密需通过get方式在url中传递的参数
*/
function args_encode($data) {
if(is_array($data)) {
$string = http_build_query($data);
return base64_encode($string);
} else {
return false;
}
}
/**
*获取url中get方式传递的参数
*/
function getargs() {
$string = base64_decode($_GET['args']);
parse_str($string,$g);
return $g;
}

I hope this article will be helpful to everyone’s PHP program design.

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