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      1 // Copyright 2013 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 MEDIA_CDM_JSON_WEB_KEY_H_
      6 #define MEDIA_CDM_JSON_WEB_KEY_H_
      7 
      8 #include <string>
      9 #include <utility>
     10 #include <vector>
     11 
     12 #include "base/basictypes.h"
     13 #include "media/base/media_export.h"
     14 
     15 namespace media {
     16 
     17 // A JSON Web Key Set looks like the following in JSON:
     18 //   { "keys": [ JWK1, JWK2, ... ] }
     19 // A symmetric keys JWK looks like the following in JSON:
     20 //   { "kty":"oct",
     21 //     "kid":"AQIDBAUGBwgJCgsMDQ4PEA",
     22 //     "k":"FBUWFxgZGhscHR4fICEiIw" }
     23 // There may be other properties specified, but they are ignored.
     24 // Ref: http://tools.ietf.org/html/draft-ietf-jose-json-web-key and:
     25 // http://tools.ietf.org/html/draft-jones-jose-json-private-and-symmetric-key
     26 //
     27 // For EME WD, both 'kid' and 'k' are base64 encoded strings, without trailing
     28 // padding.
     29 
     30 // Vector of [key_id, key_value] pairs. Values are raw binary data, stored in
     31 // strings for convenience.
     32 typedef std::pair<std::string, std::string> KeyIdAndKeyPair;
     33 typedef std::vector<KeyIdAndKeyPair> KeyIdAndKeyPairs;
     34 
     35 // Converts a single |key|, |key_id| pair to a JSON Web Key Set.
     36 MEDIA_EXPORT std::string GenerateJWKSet(const uint8* key, int key_length,
     37                                         const uint8* key_id, int key_id_length);
     38 
     39 // Extracts the JSON Web Keys from a JSON Web Key Set. If |input| looks like
     40 // a valid JWK Set, then true is returned and |keys| is updated to contain
     41 // the list of keys found. Otherwise return false.
     42 MEDIA_EXPORT bool ExtractKeysFromJWKSet(const std::string& jwk_set,
     43                                         KeyIdAndKeyPairs* keys);
     44 
     45 }  // namespace media
     46 
     47 #endif  // MEDIA_CDM_JSON_WEB_KEY_H_
     48