PHP encryption and decryption functions_PHP tutorial

/**
*Function: Encrypt string
*Parameter 1: Content to be encrypted
*Parameter 2: Key
*/
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 $ctr=$ctr==strlen($encrypt_key)?0:$ctr;
$tmp.=$encrypt_key[$ctr].($str[$i] ^ $encrypt_key[$ctr++]);
}
return base64_encode(passport_key($tmp,$key));
}

/**
*Function: Decrypt the string
*Parameter 1: The ciphertext to be decrypted
*Parameter 2: Key
*/
function passport_decrypt($str,$key){ //解密函数
$str=passport_key(base64_decode($str),$key);
$tmp='';
for($i=0;$i $md5=$str[$i];
$tmp.=$str[++$i] ^ $md5;
}
return $tmp;
}

/**
*Auxiliary function
*/
function passport_key($str,$encrypt_key){
$encrypt_key=md5($encrypt_key);
$ctr=0;
$tmp='';
for($i=0;$i $ctr=$ctr==strlen($encrypt_key)?0:$ctr;
$tmp.=$str[$i] ^ $encrypt_key[$ctr++];
}
return $tmp;
}

$str='作者：www.phpernote.com';
$key='658jr';
$encrypt=passport_encrypt($str,$key);
$decrypt=passport_decrypt($encrypt,$key);

echo '原文：',$str."

---

";
echo '密文：',$encrypt."

---

";
echo '译文：',$decrypt."

---

";

http://www.bkjia.com/PHPjc/780021.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/780021.htmlTechArticle?php /***Function: Encrypt string *Parameter 1: Content to be encrypted *Parameter 2: Key*/ function passport_encrypt($str,$key){ //加密函数 srand((double)micro...