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php實(shí)現(xiàn)的三個(gè)常用加密解密功能函數(shù)示例

 更新時(shí)間:2017年11月06日 14:23:10   作者:zqifa  
這篇文章主要介紹了php實(shí)現(xiàn)的三個(gè)常用加密解密功能函數(shù),涉及php針對字符串的遍歷、截取、編碼轉(zhuǎn)換等相關(guān)操作技巧,需要的朋友可以參考下

本文實(shí)例講述了php實(shí)現(xiàn)的三個(gè)常用加密解密功能函數(shù)。分享給大家供大家參考,具體如下:

算法一:

//加密函數(shù)
function lock_url($txt,$key='www.dbjr.com.cn')
{
  $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
  $nh = rand(0,64);
  $ch = $chars[$nh];
  $mdKey = md5($key.$ch);
  $mdKey = substr($mdKey,$nh%8, $nh%8+7);
  $txt = base64_encode($txt);
  $tmp = '';
  $i=0;$j=0;$k = 0;
  for ($i=0; $i<strlen($txt); $i++) {
    $k = $k == strlen($mdKey) ? 0 : $k;
    $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;
    $tmp .= $chars[$j];
  }
  return urlencode($ch.$tmp);
}
//解密函數(shù)
function unlock_url($txt,$key='www.dbjr.com.cn')
{
  $txt = urldecode($txt);
  $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
  $ch = $txt[0];
  $nh = strpos($chars,$ch);
  $mdKey = md5($key.$ch);
  $mdKey = substr($mdKey,$nh%8, $nh%8+7);
  $txt = substr($txt,1);
  $tmp = '';
  $i=0;$j=0; $k = 0;
  for ($i=0; $i<strlen($txt); $i++) {
    $k = $k == strlen($mdKey) ? 0 : $k;
    $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);
    while ($j<0) $j+=64;
    $tmp .= $chars[$j];
  }
  return base64_decode($tmp);
}

用法:

$str="腳本之家";
$pwd = lock_url($str);
echo "加密之后:".$pwd."<br/>";
echo "解密還原:".unlock_url($pwd);

運(yùn)行結(jié)果:

算法二:

<?php
function passport_encrypt($txt, $key = 'www.dbjr.com.cn') 
{ 
  srand((double)microtime() * 1000000); 
  $encrypt_key = md5(rand(0, 32000)); 
  $ctr = 0; 
  $tmp = ''; 
  for($i = 0;$i < strlen($txt); $i++) { 
  $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr; 
  $tmp .= $encrypt_key[$ctr].($txt[$i] ^ $encrypt_key[$ctr++]); 
  } 
  return urlencode(base64_encode(passport_key($tmp, $key))); 
} 
function passport_decrypt($txt, $key = 'www.dbjr.com.cn') 
{ 
  $txt = passport_key(base64_decode(urldecode($txt)), $key); 
  $tmp = ''; 
  for($i = 0;$i < strlen($txt); $i++) { 
  $md5 = $txt[$i]; 
  $tmp .= $txt[++$i] ^ $md5; 
  } 
  return $tmp; 
} 
function passport_key($txt, $encrypt_key) 
{ 
  $encrypt_key = md5($encrypt_key); 
  $ctr = 0; 
  $tmp = ''; 
  for($i = 0; $i < strlen($txt); $i++) { 
  $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr; 
  $tmp .= $txt[$i] ^ $encrypt_key[$ctr++]; 
  } 
  return $tmp; 
} 
?>

用法:

<?php
$txt = "1";
$key = "testkey";
$encrypt = passport_encrypt($txt,$key);
$decrypt = passport_decrypt($encrypt,$key);
echo $encrypt."<br>";
echo $decrypt."<br>";
?>

運(yùn)行結(jié)果:

算法三(改進(jìn)第一個(gè)加密之后的算法)

//加密函數(shù)
function lock_url($txt,$key='www.dbjr.com.cn')
{
  $txt = $txt.$key;
  $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
  $nh = rand(0,64);
  $ch = $chars[$nh];
  $mdKey = md5($key.$ch);
  $mdKey = substr($mdKey,$nh%8, $nh%8+7);
  $txt = base64_encode($txt);
  $tmp = '';
  $i=0;$j=0;$k = 0;
  for ($i=0; $i<strlen($txt); $i++) {
    $k = $k == strlen($mdKey) ? 0 : $k;
    $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;
    $tmp .= $chars[$j];
  }
  return urlencode(base64_encode($ch.$tmp));
}
//解密函數(shù)
function unlock_url($txt,$key='www.dbjr.com.cn')
{
  $txt = base64_decode(urldecode($txt));
  $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
  $ch = $txt[0];
  $nh = strpos($chars,$ch);
  $mdKey = md5($key.$ch);
  $mdKey = substr($mdKey,$nh%8, $nh%8+7);
  $txt = substr($txt,1);
  $tmp = '';
  $i=0;$j=0; $k = 0;
  for ($i=0; $i<strlen($txt); $i++) {
    $k = $k == strlen($mdKey) ? 0 : $k;
    $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);
    while ($j<0) $j+=64;
    $tmp .= $chars[$j];
  }
  return trim(base64_decode($tmp),$key);
}

用法:

$str="腳本之家";
$pwd = lock_url($str);
echo "加密之后:".$pwd."<br/>";
echo "解密還原:".unlock_url($pwd);

運(yùn)行結(jié)果:

PS:關(guān)于加密解密感興趣的朋友還可以參考本站在線工具:

文字在線加密解密工具(包含AES、DES、RC4等):
http://tools.jb51.net/password/txt_encode

MD5在線加密工具:
http://tools.jb51.net/password/CreateMD5Password

在線散列/哈希算法加密工具:
http://tools.jb51.net/password/hash_encrypt

在線MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具:
http://tools.jb51.net/password/hash_md5_sha

在線sha1/sha224/sha256/sha384/sha512加密工具:
http://tools.jb51.net/password/sha_encode

更多關(guān)于PHP相關(guān)內(nèi)容感興趣的讀者可查看本站專題:《php加密方法總結(jié)》、《PHP編碼與轉(zhuǎn)碼操作技巧匯總》、《PHP數(shù)學(xué)運(yùn)算技巧總結(jié)》、《PHP數(shù)組(Array)操作技巧大全》、《php字符串(string)用法總結(jié)》、《PHP數(shù)據(jù)結(jié)構(gòu)與算法教程》、《php程序設(shè)計(jì)算法總結(jié)》及《php正則表達(dá)式用法總結(jié)

希望本文所述對大家PHP程序設(shè)計(jì)有所幫助。

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