encrypt.encrypt.inc in Encrypt 6

This file holds the hook implementation for the encrypt modules

File

includes/encrypt.encrypt.inc

<?php

/**
 * @file
 * This file holds the hook implementation for the encrypt modules
 *
 * @ingroup encrypt
 */

/**
 * Implementation of encrypt_method_info().
 */
function encrypt_encrypt_method_info() {
  $methods = array();
  $default_method = (string) ENCRYPT_DEFAULT_METHOD;

  // Basic methods that dont need any extensions
  $methods[$default_method] = array(
    'title' => t('Basic'),
    'description' => t('This is the basic default encryption type that does not require any special extensions.'),
    'callback' => 'encrypt_encrypt_basic',
  );
  $methods['none'] = array(
    'title' => t('None'),
    'description' => t('This uses no encryption.  It is not suggested to use this.'),
    'callback' => 'encrypt_encrypt_none',
  );

  // Mcrypt method
  if (function_exists('mcrypt_get_iv_size') && function_exists('mcrypt_create_iv') && function_exists('mcrypt_encrypt')) {
    $methods['mcrypt_rij_256'] = array(
      'title' => t('Mcrypt AES 256'),
      'description' => t('This uses PHPs mcrypt extension and <a href="!url">AES-256</a>.', array(
        '!url' => 'http://en.wikipedia.org/wiki/Advanced_Encryption_Standard',
      )),
      'callback' => 'encrypt_encrypt_mcrypt_rij_256',
    );
  }
  return $methods;
}

/**
 * Call back for Encrypt implementation: none
 */
function encrypt_encrypt_none($op = 'encrypt', $text = '', $key = ENCRYPT_DEFAULT_KEY_NONE, $options = array()) {

  // Check op
  if ($op == 'decrypt') {

    // No encryption
    return $text;
  }
  else {

    // No encryption
    return $text;
  }
}

/**
 * Call back for Encrypt implementation: default
 *
 * This method uses a simple encryption method of character
 * replacement.  Note that we are not using the drupal_
 * equivalent for strlen and substr because of issues.
 */
function encrypt_encrypt_basic($op = 'encrypt', $text = '', $key = ENCRYPT_DEFAULT_KEY_NONE, $options = array()) {
  $processed_text = '';

  // Check op
  if ($op == 'decrypt') {

    // Decrypt
    for ($i = 0; $i < strlen($text); $i++) {
      $char = substr($text, $i, 1);
      $keychar = substr($key, $i % strlen($key) - 1, 1);
      $char = chr(ord($char) - ord($keychar));
      $processed_text .= $char;
    }
  }
  else {

    // Encrypt
    for ($i = 0; $i < strlen($text); $i++) {
      $char = substr($text, $i, 1);
      $keychar = substr($key, $i % strlen($key) - 1, 1);
      $char = chr(ord($char) + ord($keychar));
      $processed_text .= $char;
    }
  }
  return $processed_text;
}

/**
 * Call back for Encrypt implementation: Mcrypt
 *
 * This method uses a PHPs mcrypt extension and AES-256
 */
function encrypt_encrypt_mcrypt_rij_256($op = 'encrypt', $text = '', $key = ENCRYPT_DEFAULT_KEY_NONE, $options = array()) {
  $processed_text = '';
  $options = is_array($options) ? $options : array();

  // Key cannot be too long for this encryption
  $key = drupal_substr($key, 0, 32);

  // Check base64 flag
  $options['base64'] = isset($options['base64']) ? $options['base64'] : TRUE;

  // Define iv cipher
  $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
  $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);

  // Check op
  if ($op == 'decrypt') {

    // Decrypt
    // Check if we are using base64 encoding
    if ($options['base64'] !== FALSE) {
      $text = base64_decode($text);
    }

    // Decrypt text
    $processed_text = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);
  }
  else {

    // Encrypt
    $processed_text = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);

    // Check if we are using base64 encoding
    if ($options['base64'] !== FALSE) {
      $processed_text = base64_encode($processed_text);
    }
  }
  return trim($processed_text);
}

Related topics

Encrypt: Provides an API for two-way encryption

Provides an API for two-way encryption. Drupal has no native way to do two-way encryption. PHP's ability to do two-way encryption is a little more involved than most people care to get into. This module provides an easy way to encrypt() and…

Functions

Name	Description
encrypt_encrypt_basic	Call back for Encrypt implementation: default
encrypt_encrypt_mcrypt_rij_256	Call back for Encrypt implementation: Mcrypt
encrypt_encrypt_method_info	Implementation of encrypt_method_info().
encrypt_encrypt_none	Call back for Encrypt implementation: none