Merge "MediaCas: add two sets of test plugins" (52d0204d) · Commits · e / os / android_frameworks_av

drm/mediacas/plugins/clearkey/Android.mk

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		#
		# Copyright (C) 2017 The Android Open Source Project
		#
		# Licensed under the Apache License, Version 2.0 (the "License");
		# you may not use this file except in compliance with the License.
		# You may obtain a copy of the License at
		#
		# http://www.apache.org/licenses/LICENSE-2.0
		#
		# Unless required by applicable law or agreed to in writing, software
		# distributed under the License is distributed on an "AS IS" BASIS,
		# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		# See the License for the specific language governing permissions and
		# limitations under the License.
		#
		LOCAL_PATH:= $(call my-dir)
		include $(CLEAR_VARS)

		LOCAL_SRC_FILES:= \
		ClearKeyCasPlugin.cpp \
		ClearKeyFetcher.cpp \
		ClearKeyLicenseFetcher.cpp \
		ClearKeySessionLibrary.cpp \
		ecm.cpp \
		ecm_generator.cpp \
		JsonAssetLoader.cpp \
		protos/license_protos.proto \

		LOCAL_MODULE := libclearkeycasplugin

		LOCAL_PROPRIETARY_MODULE := true
		LOCAL_MODULE_RELATIVE_PATH := mediacas

		LOCAL_SHARED_LIBRARIES := \
		libutils \
		liblog \
		libcrypto \
		libstagefright_foundation \
		libprotobuf-cpp-lite \

		LOCAL_STATIC_LIBRARIES := \
		libjsmn \

		LOCAL_MODULE_CLASS := SHARED_LIBRARIES

		LOCAL_PROTOC_OPTIMIZE_TYPE := full

		define proto_includes
		$(call local-generated-sources-dir)/proto/$(LOCAL_PATH)
		endef

		LOCAL_C_INCLUDES += \
		external/jsmn \
		frameworks/av/include \
		frameworks/native/include/media \
		$(call proto_includes)

		LOCAL_EXPORT_C_INCLUDE_DIRS := \
		$(call proto_includes)

		LOCAL_MODULE_TAGS := optional

		include $(BUILD_SHARED_LIBRARY)

		#########################################################################
		# Build unit tests

		include $(LOCAL_PATH)/tests/Android.mk

drm/mediacas/plugins/clearkey/ClearKeyCasPlugin.cpp

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		/*
		* Copyright (C) 2017 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		//#define LOG_NDEBUG 0
		#define LOG_TAG "ClearKeyCasPlugin"

		#include "ClearKeyFetcher.h"
		#include "ecm.h"
		#include "ClearKeyLicenseFetcher.h"
		#include "ClearKeyCasPlugin.h"
		#include "ClearKeySessionLibrary.h"
		#include <media/stagefright/foundation/ABuffer.h>
		#include <media/stagefright/foundation/ADebug.h>
		#include <media/stagefright/foundation/hexdump.h>
		#include <media/stagefright/MediaErrors.h>
		#include <utils/Log.h>

		android::CasFactory* createCasFactory() {
		return new android::clearkeycas::ClearKeyCasFactory();
		}

		android::DescramblerFactory *createDescramblerFactory()
		{
		return new android::clearkeycas::ClearKeyDescramblerFactory();
		}

		namespace android {
		namespace clearkeycas {

		static const int32_t sClearKeySystemId = 0xF6D8;

		bool ClearKeyCasFactory::isSystemIdSupported(int32_t CA_system_id) const {
		return CA_system_id == sClearKeySystemId;
		}

		status_t ClearKeyCasFactory::queryPlugins(
		std::vector<CasPluginDescriptor> *descriptors) const {
		descriptors->clear();
		descriptors->push_back({sClearKeySystemId, String8("Clear Key CAS")});
		return OK;
		}

		status_t ClearKeyCasFactory::createPlugin(
		int32_t CA_system_id,
		uint64_t appData,
		CasPluginCallback callback,
		CasPlugin **plugin) {
		if (!isSystemIdSupported(CA_system_id)) {
		return BAD_VALUE;
		}

		*plugin = new ClearKeyCasPlugin(appData, callback);
		return OK;
		}
		///////////////////////////////////////////////////////////////////////////////
		bool ClearKeyDescramblerFactory::isSystemIdSupported(
		int32_t CA_system_id) const {
		return CA_system_id == sClearKeySystemId;
		}

		status_t ClearKeyDescramblerFactory::createPlugin(
		int32_t CA_system_id, DescramblerPlugin** plugin) {
		if (!isSystemIdSupported(CA_system_id)) {
		return BAD_VALUE;
		}

		*plugin = new ClearKeyDescramblerPlugin();
		return OK;
		}

		///////////////////////////////////////////////////////////////////////////////
		ClearKeyCasPlugin::ClearKeyCasPlugin(
		uint64_t appData, CasPluginCallback callback)
		: mAppData(appData), mCallback(callback) {
		ALOGV("CTOR");
		}

		ClearKeyCasPlugin::~ClearKeyCasPlugin() {
		ALOGV("DTOR");
		ClearKeySessionLibrary::get()->destroyPlugin(this);
		}

		status_t ClearKeyCasPlugin::setPrivateData(const CasData &data) {
		ALOGV("setPrivateData");

		return OK;
		}

		static String8 sessionIdToString(const std::vector<uint8_t> &array) {
		String8 result;
		for (size_t i = 0; i < array.size(); i++) {
		result.appendFormat("%02x ", array[i]);
		}
		if (result.isEmpty()) {
		result.append("(null)");
		}
		return result;
		}

		status_t ClearKeyCasPlugin::openSession(
		uint16_t program_number, CasSessionId* sessionId) {
		ALOGV("openSession: program_number=%u", program_number);

		return ClearKeySessionLibrary::get()->addSession(
		this, program_number, 0, sessionId);
		}

		status_t ClearKeyCasPlugin::openSession(
		uint16_t program_number,
		uint16_t elementary_PID,
		CasSessionId *sessionId) {
		ALOGV("openSession: program_number=%u, elementary_PID=%u",
		program_number, elementary_PID);

		return ClearKeySessionLibrary::get()->addSession(
		this, program_number, elementary_PID, sessionId);
		}

		status_t ClearKeyCasPlugin::closeSession(const CasSessionId &sessionId) {
		ALOGV("closeSession: sessionId=%s", sessionIdToString(sessionId).string());
		sp<ClearKeyCasSession> session =
		ClearKeySessionLibrary::get()->findSession(sessionId);
		if (session == NULL) {
		return ERROR_DRM_SESSION_NOT_OPENED;
		}

		ClearKeySessionLibrary::get()->destroySession(sessionId);
		return OK;
		}

		status_t ClearKeyCasPlugin::setSessionPrivateData(
		const CasSessionId &sessionId, const CasData &data) {
		ALOGV("setSessionPrivateData: sessionId=%s",
		sessionIdToString(sessionId).string());
		sp<ClearKeyCasSession> session =
		ClearKeySessionLibrary::get()->findSession(sessionId);
		if (session == NULL) {
		return ERROR_DRM_SESSION_NOT_OPENED;
		}
		return OK;
		}

		status_t ClearKeyCasPlugin::processEcm(
		const CasSessionId &sessionId, const CasEcm& ecm) {
		ALOGV("processEcm: sessionId=%s", sessionIdToString(sessionId).string());
		sp<ClearKeyCasSession> session =
		ClearKeySessionLibrary::get()->findSession(sessionId);
		if (session == NULL) {
		return ERROR_DRM_SESSION_NOT_OPENED;
		}

		Mutex::Autolock lock(mKeyFetcherLock);

		return session->updateECM(mKeyFetcher.get(), (void*)ecm.data(), ecm.size());
		}

		status_t ClearKeyCasPlugin::processEmm(const CasEmm& emm) {
		ALOGV("processEmm");
		Mutex::Autolock lock(mKeyFetcherLock);

		return OK;
		}

		status_t ClearKeyCasPlugin::sendEvent(
		int32_t event, int32_t arg, const CasData &eventData) {
		ALOGV("sendEvent: event=%d, arg=%d", event, arg);
		// Echo the received event to the callback.
		// Clear key plugin doesn't use any event, echo'ing for testing only.
		if (mCallback != NULL) {
		mCallback((void)mAppData, event, arg, (uint8_t)eventData.data(), eventData.size());
		}
		return OK;
		}

		status_t ClearKeyCasPlugin::provision(const String8 &str) {
		ALOGV("provision: provisionString=%s", str.string());
		Mutex::Autolock lock(mKeyFetcherLock);

		std::unique_ptr<ClearKeyLicenseFetcher> license_fetcher;
		license_fetcher.reset(new ClearKeyLicenseFetcher());
		status_t err = license_fetcher->Init(str.string());
		if (err != OK) {
		ALOGE("provision: failed to init ClearKeyLicenseFetcher (err=%d)", err);
		return err;
		}

		std::unique_ptr<ClearKeyFetcher> key_fetcher;
		key_fetcher.reset(new ClearKeyFetcher(std::move(license_fetcher)));
		err = key_fetcher->Init();
		if (err != OK) {
		ALOGE("provision: failed to init ClearKeyFetcher (err=%d)", err);
		return err;
		}

		ALOGV("provision: using ClearKeyFetcher");
		mKeyFetcher = std::move(key_fetcher);

		return OK;
		}

		status_t ClearKeyCasPlugin::refreshEntitlements(
		int32_t refreshType, const CasData &refreshData) {
		ALOGV("refreshEntitlements");
		Mutex::Autolock lock(mKeyFetcherLock);

		return OK;
		}

		///////////////////////////////////////////////////////////////////////

		// AES-128 CBC-CTS decrypt optimized for Transport Packets. \|key\| is the AES
		// key (odd key or even key), \|length\| is the data size, and \|buffer\| is the
		// ciphertext to be decrypted in place.
		status_t TpBlockCtsDecrypt(const AES_KEY& key, size_t length, char* buffer) {
		CHECK(buffer);

		// Invariant: Packet must be at least 16 bytes.
		CHECK(length >= AES_BLOCK_SIZE);

		// OpenSSL uses unsigned char.
		unsigned char* data = reinterpret_cast<unsigned char*>(buffer);

		// Start with zero-filled initialization vector.
		unsigned char iv[AES_BLOCK_SIZE];
		memset(iv, 0, AES_BLOCK_SIZE);

		// Size of partial last block handled via CTS.
		int cts_byte_count = length % AES_BLOCK_SIZE;

		// If there no is no partial last block, then process using normal CBC.
		if (cts_byte_count == 0) {
		AES_cbc_encrypt(data, data, length, &key, iv, 0);
		return OK;
		}

		// Cipher text stealing (CTS) - Schneier Figure 9.5 p 196.
		// In CTS mode, the last two blocks have been swapped. Block[n-1] is really
		// the original block[n] combined with the low-order bytes of the original
		// block[n-1], while block[n] is the high-order bytes of the original
		// block[n-1] padded with zeros.

		// Block[0] - block[n-2] are handled with normal CBC.
		int cbc_byte_count = length - cts_byte_count - AES_BLOCK_SIZE;
		if (cbc_byte_count > 0) {
		AES_cbc_encrypt(data, data, cbc_byte_count, &key, iv, 0);
		// \|data\| points to block[n-1].
		data += cbc_byte_count;
		}

		// Save block[n] to use as IV when decrypting block[n-1].
		unsigned char block_n[AES_BLOCK_SIZE];
		memset(block_n, 0, AES_BLOCK_SIZE);
		memcpy(block_n, data + AES_BLOCK_SIZE, cts_byte_count);

		// Decrypt block[n-1] using block[n] as IV, consistent with the original
		// block order.
		AES_cbc_encrypt(data, data, AES_BLOCK_SIZE, &key, block_n, 0);

		// Return the stolen ciphertext: swap the high-order bytes of block[n]
		// and block[n-1].
		for (int i = 0; i < cts_byte_count; i++) {
		unsigned char temp = *(data + i);
		(data + i) = (data + AES_BLOCK_SIZE + i);
		*(data + AES_BLOCK_SIZE + i) = temp;
		}

		// Decrypt block[n-1] using previous IV.
		AES_cbc_encrypt(data, data, AES_BLOCK_SIZE, &key, iv, 0);
		return OK;
		}

		// PES header and ECM stream header layout
		//
		// processECM() receives the data_byte portion from the transport packet.
		// Below is the layout of the first 16 bytes of the ECM PES packet. Here
		// we don't parse them, we skip them and go to the ECM container directly.
		// The layout is included here only for reference.
		//
		// 0-2: 0x00 00 01 = start code prefix.
		// 3: 0xf0 = stream type (90 = ECM).
		// 4-5: 0x00 00 = PES length (filled in later, this is the length of the
		// PES header (16) plus the length of the ECM container).
		// 6-7: 0x00 00 = ECM major version.
		// 8-9: 0x00 01 = ECM minor version.
		// 10-11: 0x00 00 = Crypto period ID (filled in later).
		// 12-13: 0x00 00 = ECM container length (filled in later, either 84 or
		// 166).
		// 14-15: 0x00 00 = offset = 0.

		const static size_t kEcmHeaderLength = 16;
		const static size_t kUserKeyLength = 16;

		status_t ClearKeyCasSession::updateECM(
		KeyFetcher keyFetcher, void ecm, size_t size) {
		if (keyFetcher == nullptr) {
		return ERROR_DRM_NOT_PROVISIONED;
		}

		if (size < kEcmHeaderLength) {
		ALOGE("updateECM: invalid ecm size %zu", size);
		return BAD_VALUE;
		}

		Mutex::Autolock _lock(mKeyLock);

		if (mEcmBuffer != NULL && mEcmBuffer->capacity() == size
		&& !memcmp(mEcmBuffer->base(), ecm, size)) {
		return OK;
		}

		mEcmBuffer = ABuffer::CreateAsCopy(ecm, size);
		mEcmBuffer->setRange(kEcmHeaderLength, size - kEcmHeaderLength);

		uint64_t asset_id;
		std::vector<KeyFetcher::KeyInfo> keys;
		status_t err = keyFetcher->ObtainKey(mEcmBuffer, &asset_id, &keys);
		if (err != OK) {
		ALOGE("updateECM: failed to obtain key (err=%d)", err);
		return err;
		}

		ALOGV("updateECM: %zu key(s) found", keys.size());
		for (size_t keyIndex = 0; keyIndex < keys.size(); keyIndex++) {
		String8 str;

		const sp<ABuffer>& keyBytes = keys[keyIndex].key_bytes;
		CHECK(keyBytes->size() == kUserKeyLength);

		int result = AES_set_decrypt_key(
		reinterpret_cast<const uint8_t*>(keyBytes->data()),
		AES_BLOCK_SIZE * 8, &mKeyInfo[keyIndex].contentKey);
		mKeyInfo[keyIndex].valid = (result == 0);
		if (!mKeyInfo[keyIndex].valid) {
		ALOGE("updateECM: failed to set key %d, key_id=%d",
		keyIndex, keys[keyIndex].key_id);
		}
		}
		return OK;
		}

		// Decryption of a set of sub-samples
		ssize_t ClearKeyCasSession::decrypt(
		bool secure, DescramblerPlugin::ScramblingControl scramblingControl,
		size_t numSubSamples, const DescramblerPlugin::SubSample *subSamples,
		const void srcPtr, void dstPtr, AString * /* errorDetailMsg */) {
		AES_KEY contentKey;

		if (scramblingControl != DescramblerPlugin::kScrambling_Unscrambled) {
		// Hold lock to get the key only to avoid contention for decryption
		Mutex::Autolock _lock(mKeyLock);

		int32_t keyIndex = (scramblingControl & 1);
		if (!mKeyInfo[keyIndex].valid) {
		ALOGE("decrypt: key %d is invalid", keyIndex);
		return ERROR_DRM_DECRYPT;
		}
		contentKey = mKeyInfo[keyIndex].contentKey;
		}

		uint8_t src = (uint8_t)srcPtr;
		uint8_t dst = (uint8_t)dstPtr;

		for (size_t i = 0; i < numSubSamples; i++) {
		size_t numBytesinSubSample = subSamples[i].mNumBytesOfClearData
		+ subSamples[i].mNumBytesOfEncryptedData;
		if (src != dst) {
		memcpy(dst, src, numBytesinSubSample);
		}
		status_t err = OK;
		// Don't decrypt if len < AES_BLOCK_SIZE.
		// The last chunk shorter than AES_BLOCK_SIZE is not encrypted.
		if (scramblingControl != DescramblerPlugin::kScrambling_Unscrambled
		&& subSamples[i].mNumBytesOfEncryptedData >= AES_BLOCK_SIZE) {
		err = decryptPayload(
		contentKey,
		numBytesinSubSample,
		subSamples[i].mNumBytesOfClearData,
		(char *)dst);
		}

		dst += numBytesinSubSample;
		src += numBytesinSubSample;
		}
		return dst - (uint8_t *)dstPtr;
		}

		// Decryption of a TS payload
		status_t ClearKeyCasSession::decryptPayload(
		const AES_KEY& key, size_t length, size_t offset, char* buffer) const {
		CHECK(buffer);

		// Invariant: only call decryptPayload with TS packets with at least 16
		// bytes of payload (AES_BLOCK_SIZE).

		CHECK(length >= offset + AES_BLOCK_SIZE);

		return TpBlockCtsDecrypt(key, length - offset, buffer + offset);
		}

		///////////////////////////////////////////////////////////////////////////
		#undef LOG_TAG
		#define LOG_TAG "ClearKeyDescramblerPlugin"

		bool ClearKeyDescramblerPlugin::requiresSecureDecoderComponent(
		const char *mime) const {
		ALOGV("requiresSecureDecoderComponent: mime=%s", mime);
		return false;
		}

		status_t ClearKeyDescramblerPlugin::setMediaCasSession(
		const CasSessionId &sessionId) {
		ALOGV("setMediaCasSession: sessionId=%s", sessionIdToString(sessionId).string());

		sp<ClearKeyCasSession> session =
		ClearKeySessionLibrary::get()->findSession(sessionId);

		if (session == NULL) {
		ALOGE("ClearKeyDescramblerPlugin: session not found");
		return ERROR_DRM_SESSION_NOT_OPENED;
		}

		mCASSession = session;
		return OK;
		}

		ssize_t ClearKeyDescramblerPlugin::descramble(
		bool secure,
		ScramblingControl scramblingControl,
		size_t numSubSamples,
		const SubSample *subSamples,
		const void *srcPtr,
		int32_t srcOffset,
		void *dstPtr,
		int32_t dstOffset,
		AString *errorDetailMsg) {

		ALOGV("descramble: secure=%d, sctrl=%d, subSamples=%s, "
		"srcPtr=%p, dstPtr=%p, srcOffset=%d, dstOffset=%d",
		(int)secure, (int)scramblingControl,
		subSamplesToString(subSamples, numSubSamples).string(),
		srcPtr, dstPtr, srcOffset, dstOffset);

		if (mCASSession == NULL) {
		ALOGE("Uninitialized CAS session!");
		return ERROR_DRM_DECRYPT_UNIT_NOT_INITIALIZED;
		}

		return mCASSession->decrypt(
		secure, scramblingControl,
		numSubSamples, subSamples,
		(uint8_t*)srcPtr + srcOffset,
		dstPtr == NULL ? NULL : ((uint8_t*)dstPtr + dstOffset),
		errorDetailMsg);
		}

		// Conversion utilities
		String8 ClearKeyDescramblerPlugin::arrayToString(
		uint8_t const *array, size_t len) const
		{
		String8 result("{ ");
		for (size_t i = 0; i < len; i++) {
		result.appendFormat("0x%02x ", array[i]);
		}
		result += "}";
		return result;
		}

		String8 ClearKeyDescramblerPlugin::subSamplesToString(
		SubSample const *subSamples, size_t numSubSamples) const
		{
		String8 result;
		for (size_t i = 0; i < numSubSamples; i++) {
		result.appendFormat("[%zu] {clear:%u, encrypted:%u} ", i,
		subSamples[i].mNumBytesOfClearData,
		subSamples[i].mNumBytesOfEncryptedData);
		}
		return result;
		}

		} // namespace clearkeycas
		} // namespace android

drm/mediacas/plugins/clearkey/ClearKeyCasPlugin.h

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		/*
		* Copyright (C) 2017 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#ifndef CLEARKEY_CAS_PLUGIN_H_
		#define CLEARKEY_CAS_PLUGIN_H_

		#include <media/cas/CasAPI.h>
		#include <media/cas/DescramblerAPI.h>
		#include <utils/Mutex.h>
		#include <utils/StrongPointer.h>

		extern "C" {
		android::CasFactory *createCasFactory();
		android::DescramblerFactory *createDescramblerFactory();
		}

		namespace android {
		namespace clearkeycas {

		class KeyFetcher;
		class ClearKeyCasSession;

		class ClearKeyCasFactory : public CasFactory {
		public:
		ClearKeyCasFactory() {}
		virtual ~ClearKeyCasFactory() {}

		virtual bool isSystemIdSupported(
		int32_t CA_system_id) const override;
		virtual status_t queryPlugins(
		std::vector<CasPluginDescriptor> *descriptors) const override;
		virtual status_t createPlugin(
		int32_t CA_system_id,
		uint64_t appData,
		CasPluginCallback callback,
		CasPlugin **plugin) override;
		};

		class ClearKeyDescramblerFactory : public DescramblerFactory {
		public:
		ClearKeyDescramblerFactory() {}
		virtual ~ClearKeyDescramblerFactory() {}

		virtual bool isSystemIdSupported(
		int32_t CA_system_id) const override;
		virtual status_t createPlugin(
		int32_t CA_system_id, DescramblerPlugin **plugin) override;
		};

		class ClearKeyCasPlugin : public CasPlugin {
		public:
		ClearKeyCasPlugin(uint64_t appData, CasPluginCallback callback);
		virtual ~ClearKeyCasPlugin();

		virtual status_t setPrivateData(
		const CasData &data) override;

		virtual status_t openSession(
		uint16_t program_number, CasSessionId *sessionId) override;

		virtual status_t openSession(
		uint16_t program_number,
		uint16_t elementary_PID,
		CasSessionId *sessionId) override;

		virtual status_t closeSession(
		const CasSessionId &sessionId) override;

		virtual status_t setSessionPrivateData(
		const CasSessionId &sessionId,
		const CasData &data) override;

		virtual status_t processEcm(
		const CasSessionId &sessionId, const CasEcm &ecm) override;

		virtual status_t processEmm(const CasEmm &emm) override;

		virtual status_t sendEvent(
		int32_t event, int32_t arg, const CasData &eventData) override;

		virtual status_t provision(const String8 &str) override;

		virtual status_t refreshEntitlements(
		int32_t refreshType, const CasData &refreshData) override;

		private:
		Mutex mKeyFetcherLock;
		std::unique_ptr<KeyFetcher> mKeyFetcher;
		CasPluginCallback mCallback;
		uint64_t mAppData;
		};

		class ClearKeyDescramblerPlugin : public DescramblerPlugin {
		public:
		ClearKeyDescramblerPlugin() {}
		virtual ~ClearKeyDescramblerPlugin() {};

		virtual bool requiresSecureDecoderComponent(
		const char *mime) const override;

		virtual status_t setMediaCasSession(
		const CasSessionId &sessionId) override;

		virtual ssize_t descramble(
		bool secure,
		ScramblingControl scramblingControl,
		size_t numSubSamples,
		const SubSample *subSamples,
		const void *srcPtr,
		int32_t srcOffset,
		void *dstPtr,
		int32_t dstOffset,
		AString *errorDetailMsg) override;

		private:
		sp<ClearKeyCasSession> mCASSession;

		String8 subSamplesToString(
		SubSample const *subSamples,
		size_t numSubSamples) const;
		String8 arrayToString(uint8_t const *array, size_t len) const;
		};

		} // namespace clearkeycas
		} // namespace android

		#endif // CLEARKEY_CAS_PLUGIN_H_

drm/mediacas/plugins/clearkey/ClearKeyFetcher.cpp

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drm/mediacas/plugins/clearkey/ClearKeyFetcher.h

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		/*
		* Copyright (C) 2017 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#ifndef CLEAR_KEY_FETCHER_H_
		#define CLEAR_KEY_FETCHER_H_

		#include <vector>

		#include "protos/license_protos.pb.h"

		#include <media/stagefright/foundation/ABase.h>
		#include "KeyFetcher.h"

		namespace android {
		namespace clearkeycas {

		class LicenseFetcher;

		class ClearKeyFetcher : public KeyFetcher {
		public:
		// ClearKeyFetcher takes ownership of \|license_fetcher\|.
		explicit ClearKeyFetcher(
		std::unique_ptr<LicenseFetcher> license_fetcher);

		virtual ~ClearKeyFetcher();

		// Initializes the fetcher. Must be called before ObtainKey.
		status_t Init() override;

		// Obtains the \|asset_id\| and \|keys\| from the Ecm contained in \|ecm\|.
		// Returns
		// - errors returned by EcmContainer::Parse.
		// - errors returned by ClassicLicenseFetcher::FetchLicense.
		// - errors returned by Ecm::Decrypt.
		// \|asset_id\| and \|keys\| are owned by the caller and cannot be null.
		// Init() must have been called.
		status_t ObtainKey(const sp<ABuffer>& ecm, uint64_t* asset_id,
		std::vector<KeyInfo>* keys) override;

		private:
		clearkeycas::Asset asset_;
		bool initialized_;
		std::unique_ptr<LicenseFetcher> license_fetcher_;

		DISALLOW_EVIL_CONSTRUCTORS(ClearKeyFetcher);
		};

		} // namespace clearkeycas
		} // namespace android

		#endif // CLEAR_KEY_FETCHER_H_