前言:
随着信息技术的突飞猛进,信息安全成为了数字时代的关键议题。在这一背景下,信息加密与解密技术显得尤为关键。PHP,作为一种在 Web 开发领域广受欢迎的编程语言,其在信息加密与解密方面的应用同样不容忽视。
本文旨在探讨 PHP 环境下实现信息加密与解密的多种策略,以期为开发者提供实用的指导和参考。
(1)
function encryptDecrypt($key, $string, $decrypt)
{
if ($decrypt) {
$decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($string), MCRYPT_MODE_CBC, md5(md5($key))), "12");
return $decrypted;
} else {
$encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key))));
return $encrypted;
}
}
//加密:"z0JAx4qMwcF+db5TNbp/xwdUM84snRsXvvpXuaCa4Bk="
echo encryptDecrypt('password', 'Helloweba 欢迎您', 0);
//解密:"Helloweba 欢迎您"
echo encryptDecrypt('password', 'z0JAx4qMwcF+db5TNbp/xwdUM84snRsXvvpXuaCa4Bk=', 1);
(2)
//加密函数
function lock_url($txt, $key = 'liiu')
{
$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 . $tmp);
}
//解密函数
function unlock_url($txt, $key = 'liiu')
{
$txt = urldecode($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($tmp);
}
(3)
//加密函数
function lock_url($txt, $key = 'str')
{
$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 . $tmp));
}
//解密函数
function unlock_url($txt, $key = 'str')
{
$txt = base64_decode(urldecode($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), $key);
}
(4)
function passport_encrypt($txt, $key = 'liiu')
{
srand((float)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 = 'liiu')
{
$txt = passport_key(base64_decode(urldecode($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;
}
$txt = "1";
$key = "testkey";
$encrypt = passport_encrypt($txt, $key);
$decrypt = passport_decrypt($encrypt, $key);
echo $encrypt . "<br>";
echo $decrypt . "<br>";
(5)
//函数 authcode($string, $operation, $key, $expiry)中的$string:字符串,明文或密文;$operation:DECODE 表示解密,其它表示加密;$key:密匙;$expiry:密文有效期。
function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0)
{
// 动态密匙长度,相同的明文会生成不同密文就是依靠动态密匙
$ckey_length = 4;
// 密匙
$key = md5($key ? $key : $GLOBALS['discuz_auth_key']);
// 密匙 a 会参与加解密
$keya = md5(substr($key, 0, 16));
// 密匙 b 会用来做数据完整性验证
$keyb = md5(substr($key, 16, 16));
// 密匙 c 用于变化生成的密文
$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length) : substr(md5(microtime()), -$ckey_length)) : '';
// 参与运算的密匙
$cryptkey = $keya . md5($keya . $keyc);
$key_length = strlen($cryptkey);
// 明文,前 10 位用来保存时间戳,解密时验证数据有效性,10 到 26 位用来保存$keyb(密匙 b),
//解密时会通过这个密匙验证数据完整性
// 如果是解码的话,会从第$ckey_length 位开始,因为密文前$ckey_length 位保存 动态密匙,以保证解密正确
$string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0) . substr(md5($string . $keyb), 0, 16) . $string;
$string_length = strlen($string);
$result = '';
$box = range(0, 255);
$rndkey = array();
// 产生密匙簿
for ($i = 0; $i <= 255; $i++) {
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
}
// 用固定的算法,打乱密匙簿,增加随机性,好像很复杂,实际上对并不会增加密文的强度
for ($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
// 核心加解密部分
for ($a = $j = $i = 0; $i < $string_length; $i++) {
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
// 从密匙簿得出密匙进行异或,再转成字符
$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
}
if ($operation == 'DECODE') {
// 验证数据有效性,请看未加密明文的格式
if ((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26) . $keyb), 0, 16)) {
return substr($result, 26);
} else {
return '';
}
} else {
// 把动态密匙保存在密文里,这也是为什么同样的明文,生产不同密文后能解密的原因
// 因为加密后的密文可能是一些特殊字符,复制过程可能会丢失,所以用 base64 编码
return $keyc . str_replace('=', '', base64_encode($result));
}
}
$str = 'abcdef';
$key = 'www.helloweba.com';
echo authcode($str, 'ENCODE', $key, 0); //加密
$str = '56f4yER1DI2WTzWMqsfPpS9hwyoJnFP2MpC8SOhRrxO7BOk';
echo authcode($str, 'DECODE', $key, 0); //解密
(6)
/**
* $string:需要加解密的字符串;
* $operation:E 表示加密,D 表示解密;
* $key:自定义密匙
*/
function string($string, $operation, $key = '')
{
$key = md5($key);
$key_length = strlen($key);
$string = $operation == 'D' ? base64_decode($string) : substr(md5($string . $key), 0, 8) . $string;
$string_length = strlen($string);
$rndkey = $box = array();
$result = '';
for ($i = 0; $i <= 255; $i++) {
$rndkey[$i] = ord($key[$i % $key_length]);
$box[$i] = $i;
}
for ($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for ($a = $j = $i = 0; $i < $string_length; $i++) {
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
}
if ($operation == 'D') {
if (substr($result, 0, 8) == substr(md5(substr($result, 8) . $key), 0, 8)) {
return substr($result, 8);
} else {
return '';
}
} else {
return str_replace('=', '', base64_encode($result));
}
}
转载请注明:汇站网 » PHP 加密解密用于字符串几种方法