php openssl rsa 加密解密應用

php openssl rsa 加密解密應用
 
1、安裝opensslyum -y install openssl-devel
2、安裝php openssl到php源碼包的目錄 ext/openssl 下執行：
/data/apps/php/bin/phpize
./configure with-openssl with-php-config=/data/apps/php/bin/php-config make make install
(可能需要mv config0.m4 config.m4)
把生成的 openssl.so 文件添加到php.ini中
extension = /xxx/openssl.so;
可以用以下命令查看安裝的模塊：
php -m |grep openssl
3、生成公鑰和私鑰生成私鑰： openssl genrsa 1024 > private.key
(注意，1024是密鑰的長度，如果密鑰較長，相應加密後的密文也會較長)
生成公鑰： openssl rsa -in private.key -pubout > public.key
 
4、利用php加密和解密文本，代碼如下：

<?php
class mycrypt {
 public $pubkey;
 public $privkey;
 function __construct() {
 $this->pubkey = file_get_contents('/home/openssl/public.key');
 $this->privkey = file_get_contents('/home/openssl/private.key');
 }
 public function encrypt($data) {
 if (openssl_public_encrypt($data, $encrypted, $this->pubkey))
 $data = base64_encode($encrypted);
 else




 throw new Exception('Unable to encrypt data. Perhaps it is bigger than the key size?');
 return $data;
 }
 public function decrypt($data) {
 if (openssl_private_decrypt(base64_decode($data), $decrypted, $this->privkey))
 $data = $decrypted;
 else
 $data = '';
 return $data;
 }
}
$rsa = new mycrypt();
echo $rsa -> encrypt('abc');
//echo $rsa -> decrypt('W+ducpssNJlyp2XYE08wwokHfT0bm87yBz9vviZbfjAGsy/U9Ns9FIed684lWjYyyofi/1YWrU0Mp8vLOYi8l6CfklBY=');