function drupal_hmac_base64 in Drupal 7

Same name and namespace in other branches

1. 6 includes/bootstrap.inc \drupal_hmac_base64()

Calculates a base-64 encoded, URL-safe sha-256 hmac.

Parameters

string $data: String to be validated with the hmac.

string $key: A secret string key.

Return value

string A base-64 encoded sha-256 hmac, with + replaced with -, / with _ and any = padding characters removed.

9 calls to drupal_hmac_base64()

DrupalWebTestCase::drupalGetToken in modules/simpletest/drupal_web_test_case.php

Generate a token for the currently logged in user.

drupal_generate_test_ua in includes/bootstrap.inc

Generates a user agent string with a HMAC and timestamp for simpletest.

drupal_get_token in includes/common.inc

Generates a token based on $value, the user session, and the private key.

drupal_valid_test_ua in includes/bootstrap.inc

Returns the test prefix if this is an internal request from SimpleTest.

file_managed_file_process in modules/file/file.module

Process function to expand the managed_file element type.

... See full list

File

includes/bootstrap.inc, line 2337

Functions that need to be loaded on every Drupal request.

Code

function drupal_hmac_base64($data, $key) {

  // Casting $data and $key to strings here is necessary to avoid empty string
  // results of the hash function if they are not scalar values. As this
  // function is used in security-critical contexts like token validation it is
  // important that it never returns an empty string.
  $hmac = base64_encode(hash_hmac('sha256', (string) $data, (string) $key, TRUE));

  // Modify the hmac so it's safe to use in URLs.
  return strtr($hmac, array(
    '+' => '-',
    '/' => '_',
    '=' => '',
  ));
}