mcrypt

Having recently started using cryptography in my application, I find myself puzzled by the relationship between the input text length and the ciphertext it results in. Before applying crypto, it was easy to determine the database column size. Now, however, the column size varies slightly. Two questions: Am I correct in assuming this is due to the padding of my input, so that it fits the cipher's requirments? Is there a way to accurately predict the maximum length of the ciphertext based on the maximum length of the input? And for bonus points: should I be storing the ciphertext base64-encoded

centos 版本6.6 **1. 关闭防火墙** service iptables stop **2. 安装nginx** 方法1：rpm -ivh http://nginx.org/packages/centos/6/x86_64/RPMS/nginx-1.8.0-1.el6.ngx.x86_64.rpm 方法2：yum install nginx #默认不行 推荐： #cd /etc/yum.repos.d/ #vim nginx.repo # nginx.repo [nginx] name=nginx repo baseurl=http://nginx.org/packages/centos/$releasever/$basearch/ gpgcheck=0 enabled=1 这样就可以使用 #yum install nginx 安装更新了 chkconfig nginx on #开机启动 访问测试 你可以用下列方法检查配置文件是否有语法错误 /etc/init.d/nginx configtest **3. 安装php** yum install php php-fpm php -m #查看已经安装的扩展 yum install php-mysql php-mbstring php-gd php-xml php-mcrypt #根据需要按照扩展库 chkconfig

I am trying to create an IV with the function: mcrypt_create_iv(32, MCRYPT_DEV_RANDOM) this causes the script to time out after more than 60 seconds. (maybe more?) but when I use URANDOM , it works fine almost instantly. From what I read it should take about 4 seconds with MCRYPT_DEV_RANDOM , but it is definitely taking too long. There is nothing in the error log. I have it installed with apache2 and php5 on an ubuntu 12.04 server. I have run the exact same code on my centos server without issues. Both RANDOM and Unblocking-RANDOM (URANDOM) will supply you random data, but while RANDOM will

I have a login and sign up form and use the encrypt library to encrypt the password.. I am using Xampp for my server and my system works correctly.. code to encrypt the password: $this->encrypt->encode('my password'); add encrypt library $autoload['libraries'] = array('encrypt'); and setting the secret key in config: $config['encryption_key'] = 'nmsc encrypt secret key'; My code works well using xampp server in windows but when Im trying to upload my website to ubuntu server I've got an error says The Encrypt library requires the Mcrypt extension how to fix that problem? refering this guide

Working with OAuth and encrypting the keys with the following function with a string which we'll call 'foo' (actually an OAuth token) public function encrypt( $text ) { // add end of text delimiter $data = mcrypt_encrypt( MCRYPT_RIJNDAEL_128, $this->key, $text, MCRYPT_MODE_ECB, $this->iv ); return base64_encode( $data ); } When I decrypt it using the inverse function, I end up with: Function: public function decrypt( $text ) { $text = base64_decode( $text ); return mcrypt_decrypt( MCRYPT_RIJNDAEL_128, $this->key, $text, MCRYPT_MODE_ECB, $this->iv ); } Result: foo%00%00%00%00%00%00%00%00%00%00