Encrypting & Decrypting With PHP Using OpenSSL

This simple example demonstrates how to encrypt and decrypt a string in php.
Note: This requires the Open SSL extension in your php.ini file.  Set, or uncomment the following in your php.ini file: extension=openssl to enable it.

Drop the following into a .php page to test it.

<?php

$string_to_encrypt = "This is a string I want to encrypt";

$encryption = new Encryption;

echo '<br/>Encrypted Value: ' . $encryption->encrypt($string_to_encrypt);
echo '<br/>Decrypted Value: ' . $encryption->decrypt($encryption->encrypt($string_to_encrypt));


class Encryption {

  private $encrypt_cipher_method = 'aes-256-xts';
  private $encrypt_init_vector = '1234567812345678'; // Must be 16 characters long for this usage
  private $encrypt_key = 'YOURSECRETPASSWORD'; //any length

  public function encrypt($string_to_encrypt) {
     $encrypted_value = openssl_encrypt($string_to_encrypt, $this->encrypt_cipher_method, 
        $this->encrypt_key, 0, $this->encrypt_init_vector );
     return $encrypted_value;
  }
  public function decrypt($encrypted_value) {
     $decrypted_value = openssl_decrypt($encrypted_value, $this->encrypt_cipher_method, 
        $this->encrypt_key, 0, $this->encrypt_init_vector);
     return $decrypted_value;
  }
}

?>