--- /dev/null
+/*
+ * Copyright (C) 2014 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 "ClearKeyCryptoPlugin"
+#include <utils/Log.h>
+
+#include <openssl/aes.h>
+
+#include "AesCtrDecryptor.h"
+
+namespace clearkeydrm {
+
+static const size_t kBlockBitCount = kBlockSize * 8;
+
+android::status_t AesCtrDecryptor::decrypt(const android::Vector<uint8_t>& key,
+ const Iv iv, const uint8_t* source,
+ uint8_t* destination,
+ const SubSample* subSamples,
+ size_t numSubSamples,
+ size_t* bytesDecryptedOut) {
+ uint32_t blockOffset = 0;
+ uint8_t previousEncryptedCounter[kBlockSize];
+ memset(previousEncryptedCounter, 0, kBlockSize);
+
+ size_t offset = 0;
+ AES_KEY opensslKey;
+ AES_set_encrypt_key(key.array(), kBlockBitCount, &opensslKey);
+ Iv opensslIv;
+ memcpy(opensslIv, iv, sizeof(opensslIv));
+
+ for (size_t i = 0; i < numSubSamples; ++i) {
+ const SubSample& subSample = subSamples[i];
+
+ if (subSample.mNumBytesOfClearData > 0) {
+ memcpy(destination + offset, source + offset,
+ subSample.mNumBytesOfClearData);
+ offset += subSample.mNumBytesOfClearData;
+ }
+
+ if (subSample.mNumBytesOfEncryptedData > 0) {
+ AES_ctr128_encrypt(source + offset, destination + offset,
+ subSample.mNumBytesOfEncryptedData, &opensslKey,
+ opensslIv, previousEncryptedCounter,
+ &blockOffset);
+ offset += subSample.mNumBytesOfEncryptedData;
+ }
+ }
+
+ *bytesDecryptedOut = offset;
+ return android::OK;
+}
+
+} // namespace clearkeydrm
--- /dev/null
+/*
+ * Copyright (C) 2014 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_AES_CTR_DECRYPTOR_H_
+#define CLEARKEY_AES_CTR_DECRYPTOR_H_
+
+#include <media/stagefright/foundation/ABase.h>
+#include <Utils.h>
+#include <utils/Errors.h>
+#include <utils/Vector.h>
+
+#include "ClearKeyTypes.h"
+
+namespace clearkeydrm {
+
+class AesCtrDecryptor {
+public:
+ AesCtrDecryptor() {}
+
+ android::status_t decrypt(const android::Vector<uint8_t>& key, const Iv iv,
+ const uint8_t* source, uint8_t* destination,
+ const SubSample* subSamples, size_t numSubSamples,
+ size_t* bytesDecryptedOut);
+
+private:
+ DISALLOW_EVIL_CONSTRUCTORS(AesCtrDecryptor);
+};
+
+} // namespace clearkeydrm
+
+#endif // CLEARKEY_AES_CTR_DECRYPTOR_H_
include $(CLEAR_VARS)
LOCAL_SRC_FILES := \
+ AesCtrDecryptor.cpp \
+ JsonWebKey.cpp \
Utils.cpp \
LOCAL_C_INCLUDES := \
bionic \
+ external/jsmn \
+ external/openssl/include \
frameworks/av/drm/mediadrm/plugins/clearkey \
frameworks/av/include \
frameworks/native/include \
LOCAL_MODULE_PATH := $(TARGET_OUT_VENDOR_SHARED_LIBRARIES)/mediadrm
LOCAL_SHARED_LIBRARIES := \
+ libcrypto \
liblog \
libstagefright_foundation \
libutils \
+LOCAL_STATIC_LIBRARIES := \
+ libjsmn \
+
LOCAL_MODULE_TAGS := optional
include $(BUILD_SHARED_LIBRARY)
+
+#########################################################################
+# Build unit tests
+
+include $(LOCAL_PATH)/tests/Android.mk