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- // Copyright 2013 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef MEDIA_CDM_JSON_WEB_KEY_H_
- #define MEDIA_CDM_JSON_WEB_KEY_H_
- #include <stdint.h>
- #include <string>
- #include <utility>
- #include <vector>
- #include "media/base/media_export.h"
- namespace media {
- // The ClearKey license request format is a JSON object containing the following
- // members (http://w3c.github.io/encrypted-media/#clear-key-request-format):
- // "kids" : An array of key IDs. Each element of the array is the base64url
- // encoding of the octet sequence containing the key ID value.
- // "type" : The requested MediaKeySessionType.
- // An example:
- // { "kids":["67ef0gd8pvfd0","77ef0gd8pvfd0"], "type":"temporary" }
- // The ClearKey license format is a JSON Web Key (JWK) Set containing
- // representation of the symmetric key to be used for decryption.
- // (http://w3c.github.io/encrypted-media/#clear-key-license-format)
- // For each JWK in the set, the parameter values are as follows:
- // "kty" (key type) : "oct" (octet sequence)
- // "alg" (algorithm) : "A128KW" (AES key wrap using a 128-bit key)
- // "k" (key value) : The base64url encoding of the octet sequence
- // containing the symmetric key value.
- // "kid" (key ID) : The base64url encoding of the octet sequence
- // containing the key ID value.
- // The JSON object may have an optional "type" member value, which may be
- // any of the SessionType values. If not specified, the default value of
- // "temporary" is used.
- // A JSON Web Key Set looks like the following in JSON:
- // { "keys": [ JWK1, JWK2, ... ], "type":"temporary" }
- // A symmetric keys JWK looks like the following in JSON:
- // { "kty":"oct",
- // "alg":"A128KW",
- // "kid":"AQIDBAUGBwgJCgsMDQ4PEA",
- // "k":"FBUWFxgZGhscHR4fICEiIw" }
- // There may be other properties specified, but they are ignored.
- // Ref: http://tools.ietf.org/html/draft-ietf-jose-json-web-key and:
- // http://tools.ietf.org/html/draft-jones-jose-json-private-and-symmetric-key
- enum class CdmSessionType;
- // Vector of key IDs.
- typedef std::vector<std::vector<uint8_t>> KeyIdList;
- // Vector of [key_id, key_value] pairs. Values are raw binary data, stored in
- // strings for convenience.
- typedef std::pair<std::string, std::string> KeyIdAndKeyPair;
- typedef std::vector<KeyIdAndKeyPair> KeyIdAndKeyPairs;
- // Converts a single |key|, |key_id| pair to a JSON Web Key Set.
- MEDIA_EXPORT std::string GenerateJWKSet(const uint8_t* key,
- int key_length,
- const uint8_t* key_id,
- int key_id_length);
- // Converts a set of |key|, |key_id| pairs to a JSON Web Key Set.
- MEDIA_EXPORT std::string GenerateJWKSet(const KeyIdAndKeyPairs& keys,
- CdmSessionType session_type);
- // Extracts the JSON Web Keys from a JSON Web Key Set. If |input| looks like
- // a valid JWK Set, then true is returned and |keys| and |session_type| are
- // updated to contain the values found. Otherwise return false.
- MEDIA_EXPORT bool ExtractKeysFromJWKSet(const std::string& jwk_set,
- KeyIdAndKeyPairs* keys,
- CdmSessionType* session_type);
- // Extracts the Key Ids from a Key IDs Initialization Data
- // (https://w3c.github.io/encrypted-media/keyids-format.html). If |input| looks
- // valid, then true is returned and |key_ids| is updated to contain the values
- // found. Otherwise return false and |error_message| contains the reason.
- MEDIA_EXPORT bool ExtractKeyIdsFromKeyIdsInitData(const std::string& input,
- KeyIdList* key_ids,
- std::string* error_message);
- // Creates a license request message for the |key_ids| and |session_type|
- // specified. |license| is updated to contain the resulting JSON string.
- MEDIA_EXPORT void CreateLicenseRequest(const KeyIdList& key_ids,
- CdmSessionType session_type,
- std::vector<uint8_t>* license);
- // Creates a keyIDs init_data message for the |key_ids| specified.
- // |key_ids_init_data| is updated to contain the resulting JSON string.
- MEDIA_EXPORT void CreateKeyIdsInitData(const KeyIdList& key_ids,
- std::vector<uint8_t>* key_ids_init_data);
- MEDIA_EXPORT std::vector<uint8_t> CreateLicenseReleaseMessage(
- const KeyIdList& key_ids);
- // Extract the first key from the license request message. Returns true if
- // |license| is a valid license request and contains at least one key,
- // otherwise false and |first_key| is not touched.
- MEDIA_EXPORT bool ExtractFirstKeyIdFromLicenseRequest(
- const std::vector<uint8_t>& license,
- std::vector<uint8_t>* first_key);
- } // namespace media
- #endif // MEDIA_CDM_JSON_WEB_KEY_H_
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