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PHP加密解密函数详解,加密解密函数详解

分享一个PHP加密解密的函数,此函数实现了对部分变量值的加密的功能。
加密代码如下:

/* 
*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($encrypt_key)&#63;0:$ctr; 
    $tmp.=$encrypt_key[$ctr].($str[$i] ^ $encrypt_key[$ctr++]); 
  } 
  return base64_encode(passport_key($tmp,$key)); 
} 

解密代码如下:

/* 
*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; 
} 

辅助函数:

/* 
*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($encrypt_key)&#63;0:$ctr; 
    $tmp.=$str[$i] ^ $encrypt_key[$ctr++]; 
  } 
  return $tmp; 
} 

使用如下所示:

$str='作者:余浩苗;电话:13611972365;电子邮件:123cvbz@163.com'; 
 
$key='hacker'; 
$encrypt=passport_encrypt($str,$key); 
$decrypt=passport_decrypt($encrypt,$key); 
 
echo '原文:',$str."<br><hr>"; 
echo '密文:',$encrypt."<br><hr>"; 
echo '译文:',$decrypt."<br><hr>"; 

以上就是为大家分享的php加密解密函数,希望大家喜欢,可以应用到自己的学习中。

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