<?php
error_reporting(1);
ini_set('display_errors', 1);
class Encryption {
private $key;
protected $iv_size;
protected $iv;
public function __construct() {
# --- ENCRYPTION ---
# the key should be random binary, use scrypt, bcrypt or PBKDF2 to
# convert a string into a key
# key is specified using hexadecimal
$this->key = pack("H*", "myKeyIsGreaterth2nanndbestofall04nkdsdffsd546754sdfvsdg6efflsdfs");
# create a random IV to use with CBC encoding
$this->iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
$this->iv = mcrypt_create_iv($this->iv_size, MCRYPT_RAND);
}
public function encryptData($input) {
$output = $this->encrypt($input);
return $output;
}
public function decryptData($input) {
$input = base64_decode($input);
$output = $this->decrypt($input);
return $output;
}
protected function decrypt($string) {
# retrieves the IV, iv_size should be created using mcrypt_get_iv_size()
$iv_dec = substr($string, 0, $this->iv_size);
# retrieves the cipher text (everything except the $iv_size in the front)
$string = substr($string, $this->iv_size);
# may remove 00h valued characters from end of plain text
$output = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $this->key, $string, MCRYPT_MODE_CBC, $iv_dec);
return $output;
}
protected function encrypt($string) {
# creates a cipher text compatible with AES (Rijndael block size = 128)
# to keep the text confidential
# only suitable for encoded input that never ends with value 00h
# (because of default zero padding)
$output = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $this->key, $string, MCRYPT_MODE_CBC, $this->iv);
# prepend the IV for it to be available for decryption
$output = $this->iv . $output;
# encode the resulting cipher text so it can be represented by a string
$output = base64_encode($output);
# === WARNING ===
# Resulting cipher text has no integrity or authenticity added
# and is not protected against padding oracle attacks.
return $output;
}
}
$test = new Encryption();
$encrypted = $test->encryptData("Narendra");
echo "This is encrypted text of a string Narendra $encrypted \n";
echo "This is decrypted text ".$test->decryptData($encrypted);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function mcrypt_get_iv_size() in /in/MnJGQ:19
Stack trace:
#0 /in/MnJGQ(70): Encryption->__construct()
#1 {main}
thrown in /in/MnJGQ on line 19
Process exited with code 255.
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