Provisional support for secure decryption of media streams.
Change-Id: Ib3982a9c960bfdb0cb7e1b174440b141b194cfbe
diff --git a/media/libmedia/ICrypto.cpp b/media/libmedia/ICrypto.cpp
new file mode 100644
index 0000000..827d7af
--- /dev/null
+++ b/media/libmedia/ICrypto.cpp
@@ -0,0 +1,293 @@
+/*
+ * Copyright (C) 2012 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 "ICrypto"
+#include <utils/Log.h>
+
+#include <binder/Parcel.h>
+#include <media/ICrypto.h>
+#include <media/stagefright/foundation/ADebug.h>
+
+namespace android {
+
+enum {
+ INITIALIZE = IBinder::FIRST_CALL_TRANSACTION,
+ TERMINATE,
+ SET_ENTITLEMENT_KEY,
+ SET_ECM,
+ DECRYPT_VIDEO,
+ DECRYPT_AUDIO,
+};
+
+struct BpCrypto : public BpInterface<ICrypto> {
+ BpCrypto(const sp<IBinder> &impl)
+ : BpInterface<ICrypto>(impl) {
+ }
+
+ virtual status_t initialize() {
+ Parcel data, reply;
+ data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
+ remote()->transact(INITIALIZE, data, &reply);
+
+ return reply.readInt32();
+ }
+
+ virtual status_t terminate() {
+ Parcel data, reply;
+ data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
+ remote()->transact(TERMINATE, data, &reply);
+
+ return reply.readInt32();
+ }
+
+ virtual status_t setEntitlementKey(
+ const void *key, size_t keyLength) {
+ Parcel data, reply;
+ data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
+ data.writeInt32(keyLength);
+ data.write(key, keyLength);
+ remote()->transact(SET_ENTITLEMENT_KEY, data, &reply);
+
+ return reply.readInt32();
+ }
+
+ virtual status_t setEntitlementControlMessage(
+ const void *msg, size_t msgLength) {
+ Parcel data, reply;
+ data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
+ data.writeInt32(msgLength);
+ data.write(msg, msgLength);
+ remote()->transact(SET_ECM, data, &reply);
+
+ return reply.readInt32();
+ }
+
+ virtual ssize_t decryptVideo(
+ const void *iv, size_t ivLength,
+ const void *srcData, size_t srcDataSize,
+ void *dstData, size_t dstDataOffset) {
+ Parcel data, reply;
+ data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
+ if (iv == NULL) {
+ if (ivLength > 0) {
+ return -EINVAL;
+ }
+
+ data.writeInt32(-1);
+ } else {
+ data.writeInt32(ivLength);
+ data.write(iv, ivLength);
+ }
+
+ data.writeInt32(srcDataSize);
+ data.write(srcData, srcDataSize);
+
+ data.writeIntPtr((intptr_t)dstData);
+ data.writeInt32(dstDataOffset);
+
+ remote()->transact(DECRYPT_VIDEO, data, &reply);
+
+ return reply.readInt32();
+ }
+
+ virtual ssize_t decryptAudio(
+ const void *iv, size_t ivLength,
+ const void *srcData, size_t srcDataSize,
+ void *dstData, size_t dstDataSize) {
+ Parcel data, reply;
+ data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
+ if (iv == NULL) {
+ if (ivLength > 0) {
+ return -EINVAL;
+ }
+
+ data.writeInt32(-1);
+ } else {
+ data.writeInt32(ivLength);
+ data.write(iv, ivLength);
+ }
+
+ data.writeInt32(srcDataSize);
+ data.write(srcData, srcDataSize);
+ data.writeInt32(dstDataSize);
+
+ remote()->transact(DECRYPT_AUDIO, data, &reply);
+
+ ssize_t res = reply.readInt32();
+
+ if (res <= 0) {
+ return res;
+ }
+
+ reply.read(dstData, res);
+
+ return res;
+ }
+
+private:
+ DISALLOW_EVIL_CONSTRUCTORS(BpCrypto);
+};
+
+IMPLEMENT_META_INTERFACE(Crypto, "android.hardware.ICrypto");
+
+////////////////////////////////////////////////////////////////////////////////
+
+status_t BnCrypto::onTransact(
+ uint32_t code, const Parcel &data, Parcel *reply, uint32_t flags) {
+ switch (code) {
+ case INITIALIZE:
+ {
+ CHECK_INTERFACE(ICrypto, data, reply);
+ reply->writeInt32(initialize());
+
+ return OK;
+ }
+
+ case TERMINATE:
+ {
+ CHECK_INTERFACE(ICrypto, data, reply);
+ reply->writeInt32(terminate());
+
+ return OK;
+ }
+
+ case SET_ENTITLEMENT_KEY:
+ {
+ CHECK_INTERFACE(ICrypto, data, reply);
+
+ size_t keyLength = data.readInt32();
+ void *key = malloc(keyLength);
+ data.read(key, keyLength);
+
+ reply->writeInt32(setEntitlementKey(key, keyLength));
+
+ free(key);
+ key = NULL;
+
+ return OK;
+ }
+
+ case SET_ECM:
+ {
+ CHECK_INTERFACE(ICrypto, data, reply);
+
+ size_t msgLength = data.readInt32();
+ void *msg = malloc(msgLength);
+ data.read(msg, msgLength);
+
+ reply->writeInt32(setEntitlementControlMessage(msg, msgLength));
+
+ free(msg);
+ msg = NULL;
+
+ return OK;
+ }
+
+ case DECRYPT_VIDEO:
+ {
+ CHECK_INTERFACE(ICrypto, data, reply);
+
+ void *iv = NULL;
+
+ int32_t ivLength = data.readInt32();
+ if (ivLength >= 0) {
+ iv = malloc(ivLength);
+ data.read(iv, ivLength);
+ }
+
+ size_t srcDataSize = data.readInt32();
+ void *srcData = malloc(srcDataSize);
+ data.read(srcData, srcDataSize);
+
+ void *dstData = (void *)data.readIntPtr();
+ size_t dstDataOffset = data.readInt32();
+
+ reply->writeInt32(
+ decryptVideo(
+ iv,
+ ivLength < 0 ? 0 : ivLength,
+ srcData,
+ srcDataSize,
+ dstData,
+ dstDataOffset));
+
+ free(srcData);
+ srcData = NULL;
+
+ if (iv != NULL) {
+ free(iv);
+ iv = NULL;
+ }
+
+ return OK;
+ }
+
+ case DECRYPT_AUDIO:
+ {
+ CHECK_INTERFACE(ICrypto, data, reply);
+
+ void *iv = NULL;
+
+ int32_t ivLength = data.readInt32();
+ if (ivLength >= 0) {
+ iv = malloc(ivLength);
+ data.read(iv, ivLength);
+ }
+
+ size_t srcDataSize = data.readInt32();
+ void *srcData = malloc(srcDataSize);
+ data.read(srcData, srcDataSize);
+
+ size_t dstDataSize = data.readInt32();
+ void *dstData = malloc(dstDataSize);
+
+ ssize_t res =
+ decryptAudio(
+ iv,
+ ivLength < 0 ? 0 : ivLength,
+ srcData,
+ srcDataSize,
+ dstData,
+ dstDataSize);
+
+ reply->writeInt32(res);
+
+ if (res > 0) {
+ reply->write(dstData, res);
+ }
+
+ free(dstData);
+ dstData = NULL;
+
+ free(srcData);
+ srcData = NULL;
+
+ if (iv != NULL) {
+ free(iv);
+ iv = NULL;
+ }
+
+ return OK;
+ }
+
+ default:
+ return BBinder::onTransact(code, data, reply, flags);
+ }
+}
+
+} // namespace android
+