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diff --git a/cas/native/1.0/IDescrambler.hal b/cas/native/1.0/IDescrambler.hal
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+++ b/cas/native/1.0/IDescrambler.hal
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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.
+ */
+package android.hardware.cas.native@1.0;
+
+import android.hardware.cas@1.0::IDescramblerBase;
+import android.hardware.cas@1.0::Status;
+
+/**
+ * IDescrambler is the native plugin API for descrambling operations.
+ */
+
+interface IDescrambler extends IDescramblerBase {
+    /**
+     * Descramble the data in a source SharedBuffer, described by an array of
+     * SubSample structures.
+     *
+     * @param scramblingControl an enumeration indicating the key that the subsamples
+     * were scrambled with.
+     * @param subSamples an array of SubSample structures describing the number of
+     * clear and scrambled bytes within each subsample.
+     * @param srcBuffer the SharedBuffer containing the source scrambled data.
+     * @param srcOffset the position where the source scrambled data starts at.
+     * @param dstBuffer the DestinationBuffer to hold the descrambled data.
+     * @param dstOffset the position where the descrambled data should start at.
+     *
+     * @return status the status of the call.
+     * @return bytesWritten number of bytes that have been successfully descrambled.
+     * @return detailedError a detailed message describing the error (if any).
+     */
+    descramble(ScramblingControl scramblingControl, vec<SubSample> subSamples,
+        SharedBuffer srcBuffer, uint64_t srcOffset, DestinationBuffer dstBuffer, uint64_t dstOffset)
+        generates(Status status, uint32_t bytesWritten, string detailedError);
+};