components/proximity_auth/cryptauth/base64url.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_PROXIMITY_AUTH_CRYPTAUTH_BASE64URL_H
   6 #define COMPONENTS_PROXIMITY_AUTH_CRYPTAUTH_BASE64URL_H
   7
   8 #include <string>
   9
  10 namespace proximity_auth {
  11
  12 // An implmentation of the base64url encoding. Escapes the unsafe '+' and '/'
  13 // characters with the url-safe alternatives '-' and '_', respectively. For more
  14 // info, see the section on "Base 64 Encoding with URL and Filename Safe
  15 // Alphabet" in http://www.ietf.org/rfc/rfc4648.txt
  16 // NOTE: Unlike many common web-safe encodings, this function does not escape
  17 // the '=' character. This is to match the expectations set by Android.
  18 // TODO(isherman): There are several (semantically slightly different)
  19 // implementations of this within the Chromium codebase. Try to unify them.
  20 void Base64UrlEncode(const std::string& decoded_input,
  21                      std::string* encoded_output);
  22
  23 // The inverse operation for the base64url encoding above.
  24 bool Base64UrlDecode(const std::string& encoded_input,
  25                      std::string* decoded_output);
  26
  27 }  // namespace proximity_auth
  28
  29 #endif  // COMPONENTS_PROXIMITY_BASE64URL_H