diff --git a/identity/aidl/android/hardware/identity/IIdentityCredential.aidl b/identity/aidl/android/hardware/identity/IIdentityCredential.aidl
index 7d14f03..7cd25e6 100644
--- a/identity/aidl/android/hardware/identity/IIdentityCredential.aidl
+++ b/identity/aidl/android/hardware/identity/IIdentityCredential.aidl
@@ -17,6 +17,7 @@
 package android.hardware.identity;
 
 import android.hardware.identity.Certificate;
+import android.hardware.identity.RequestNamespace;
 import android.hardware.identity.SecureAccessControlProfile;
 import android.hardware.keymaster.HardwareAuthToken;
 
@@ -82,6 +83,8 @@
     /**
      * Start an entry retrieval process.
      *
+     * The setRequestedNamespaces() method will be called before this method.
+     *
      * This method be called after createEphemeralKeyPair(), setReaderEphemeralPublicKey(),
      * createAuthChallenge() and before startRetrieveEntry(). This method call is followed by
      * multiple calls of startRetrieveEntryValue(), retrieveEntryValue(), and finally
@@ -274,7 +277,7 @@
      *            "DeviceAuthentication",
      *            SessionTranscript,
      *            DocType,
-     *            DeviceNameSpaceBytes,
+     *            DeviceNameSpacesBytes,
      *        ]
      *
      *        DocType = tstr
@@ -343,4 +346,16 @@
      * @return an X.509 certificate for the new signing key, signed by the credential key.
      */
     Certificate generateSigningKeyPair(out byte[] signingKeyBlob);
+
+    /**
+     * Sets the namespaces and data items (including their size and access control profiles)
+     * which will be requested. This method must be called before startRetrieval() is called.
+     *
+     * This information is provided to make it possible for a HAL implementation to
+     * incrementally build up cryptographically authenticated data which includes the
+     * DeviceNameSpaces CBOR.
+     *
+     * @param requestNamespaces Namespaces and data items which will be requested.
+     */
+    void setRequestedNamespaces(in RequestNamespace[] requestNamespaces);
 }
diff --git a/identity/aidl/android/hardware/identity/IWritableIdentityCredential.aidl b/identity/aidl/android/hardware/identity/IWritableIdentityCredential.aidl
index 07486e6..b7ad283 100644
--- a/identity/aidl/android/hardware/identity/IWritableIdentityCredential.aidl
+++ b/identity/aidl/android/hardware/identity/IWritableIdentityCredential.aidl
@@ -120,6 +120,8 @@
      *
      * startPersonalization must not be called more than once.
      *
+     * The setExpectedProofOfProvisioningSize() method will be called before this method.
+     *
      * @param accessControlProfileCount specifies the number of access control profiles that will
      *     be provisioned with addAccessControlProfile().
      *
@@ -288,4 +290,16 @@
      */
     void finishAddingEntries(out byte[] credentialData,
         out byte[] proofOfProvisioningSignature);
+
+    /**
+     * Sets the expected size of the ProofOfProvisioning returned by finishAddingEntries(). This
+     * method must be called before startPersonalization() is called.
+     *
+     * This information is provided to make it possible for a HAL implementation to
+     * incrementally build up cryptographically authenticated data which includes the
+     * ProofOfProvisioning CBOR.
+     *
+     * @param expectedProofOfProvisioningSize the expected size of ProofOfProvisioning.
+     */
+    void setExpectedProofOfProvisioningSize(in int expectedProofOfProvisioningSize);
 }
diff --git a/identity/aidl/android/hardware/identity/RequestDataItem.aidl b/identity/aidl/android/hardware/identity/RequestDataItem.aidl
new file mode 100644
index 0000000..05bc762
--- /dev/null
+++ b/identity/aidl/android/hardware/identity/RequestDataItem.aidl
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2020 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.identity;
+
+@VintfStability
+parcelable RequestDataItem {
+    /**
+     * The data item name being requested, for example "driving_privileges".
+     */
+    @utf8InCpp String name;
+
+    /**
+     * The size of the data item value.
+     *
+     * Data item values are always encoded as CBOR so this is the length of
+     * the CBOR encoding of the value.
+     */
+    long size;
+
+    /**
+     * The access control profile ids this data item is configured with.
+     */
+    int[] accessControlProfileIds;
+}
diff --git a/identity/aidl/android/hardware/identity/RequestNamespace.aidl b/identity/aidl/android/hardware/identity/RequestNamespace.aidl
new file mode 100644
index 0000000..4d61506
--- /dev/null
+++ b/identity/aidl/android/hardware/identity/RequestNamespace.aidl
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2020 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.identity;
+
+import android.hardware.identity.RequestDataItem;
+
+@VintfStability
+parcelable RequestNamespace {
+    /**
+     * The name of the namespace that items are being requested from, for
+     * example "org.iso.18013.5.1".
+     */
+    @utf8InCpp String namespaceName;
+
+    /**
+     * The data items requested.
+     */
+    RequestDataItem[] items;
+}