diff --git a/biometrics/face/1.0/Android.bp b/biometrics/face/1.0/Android.bp
new file mode 100644
index 0000000..61bf247
--- /dev/null
+++ b/biometrics/face/1.0/Android.bp
@@ -0,0 +1,26 @@
+// This file is autogenerated by hidl-gen -Landroidbp.
+
+hidl_interface {
+    name: "android.hardware.biometrics.face@1.0",
+    root: "android.hardware",
+    vndk: {
+        enabled: true,
+    },
+    srcs: [
+        "types.hal",
+        "IBiometricsFace.hal",
+        "IBiometricsFaceClientCallback.hal",
+    ],
+    interfaces: [
+        "android.hidl.base@1.0",
+    ],
+    types: [
+        "FaceAcquiredInfo",
+        "FaceError",
+        "OptionalUint64",
+        "Status",
+        "UserHandle",
+    ],
+    gen_java: true,
+}
+
diff --git a/biometrics/face/1.0/IBiometricsFace.hal b/biometrics/face/1.0/IBiometricsFace.hal
new file mode 100644
index 0000000..fbdb210
--- /dev/null
+++ b/biometrics/face/1.0/IBiometricsFace.hal
@@ -0,0 +1,191 @@
+/*
+ * Copyright (C) 2018 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.biometrics.face@1.0;
+
+import IBiometricsFaceClientCallback;
+
+// TODO(b/78538290): Update comments with state machine transitions when ready.
+// TODO(b/78537981): Update comments with callback interaction contract.
+// TODO(b/79496983): Update comments with status returns fully enumerated.
+/**
+ * The HAL interface for biometric face authentication.
+ */
+interface IBiometricsFace {
+
+    /**
+     * Sets the current client callback.
+     *
+     * Registers a user function that must receive notifications from the HAL.
+     * There is usually only one client (FaceService). This call must block
+     * if the HAL state machine is in busy state until the HAL leaves the
+     * busy state.
+     *
+     * All callback methods pass a deviceId to differentiate callback
+     * invocations in the case where multiple sensors exist.
+     *
+     * @param clientCallback The client defined callback to register.
+     * @return result, with its "value" parameter representing a "deviceId",
+     *     which must be unique for a given sensor.
+     */
+    @callflow(next={"setActiveUser"})
+    @entry
+    setCallback(IBiometricsFaceClientCallback clientCallback)
+        generates (OptionalUint64 result);
+
+    /**
+     * Sets the active user, which all subsequent HAL operations are applied to.
+     *
+     * HAL service implementors must ensure that operations are restricted to
+     * the given user. Clients must not call any part of this interface, except
+     * for setCallback(), without first having set an active user. The
+     * implementation is responsible for cancelling the current operation and
+     * returning to the idle state. Calling this method with the same userId
+     * should have no effect on the state machine.
+     *
+     * @param userId A non-negative user identifier that must be unique and
+     *     persistent for a given user.
+     * @param storePath filesystem path to the template storage directory.
+     */
+    @callflow(next={"authenticate", "preEnroll", "enumerate", "remove"})
+    setActiveUser(int32_t userId, string storePath) generates (Status status);
+
+    /**
+     * Begins a pre-enrollment request.
+     *
+     * Generates a unique and cryptographically secure random token used to
+     * indicate the start of an enrollment transaction. preEnroll() and
+     * postEnroll() specify a pin/pattern/password cleared time window where
+     * enrollment is allowed.
+     *
+     * preEnroll() generates a challenge which must then be wrapped by the
+     * gatekeeper after verifying a successful strong authentication attempt,
+     * which generates a Hardware Authentication Token. The challenge prevents
+     * spoofing and replay attacks and ensures that we only update a user’s face
+     * template if the operation was preceded by some kind of strong credential
+     * confirmation (e.g. device password).
+     *
+     * @return result, with its "value" parameter representing a "challenge": a
+     *     unique and cryptographically secure random token.
+     */
+    @callflow(next={"enroll", "postEnroll"})
+    preEnroll() generates (OptionalUint64 result);
+
+    /**
+     * Enrolls a user's face.
+     *
+     * Note that this interface permits implementations where multiple faces can
+     * be enrolled for a single user. However, allowing multiple faces to be
+     * enrolled can be a severe security vulnerability and hence, most
+     * implementations must ensure that only a single face be enrolled at a
+     * given time. Multi-enrollment must only be used where there is a clear
+     * necessity for a shared use case, e.g. TVs or cars.
+     *
+     * Note that the Hardware Authentication Token must still be valid after
+     * this call, and must be explicitly invalidated by a call to postEnroll().
+     * This allows clients to immediately reattempt enrollment (for example, if
+     * a user wasn’t satisfied with their enrollment) without having to go
+     * through another strong authentication flow.
+     *
+     * This method triggers the IBiometricsFaceClientCallback#onEnrollResult()
+     * method.
+     *
+     * @param hat A valid Hardware Authentication Token, generated as a result
+     *     of a preEnroll() challenge being wrapped by the gatekeeper after a
+     *     sucessful strong authentication request.
+     * @param timeoutSec A timeout in seconds, after which this enrollment
+     *     attempt is cancelled. Note that the client still needs to
+     *     call postEnroll() to terminate the enrollment session.
+     * @return status The status of this method call.
+     */
+    @callflow(next={"cancel", "enroll", "postEnroll", "remove"})
+    enroll(vec<uint8_t> hat, uint32_t timeoutSec) generates (Status status);
+
+    /**
+     * Finishes the enrollment session and invalidates the challenge generated
+     * by preEnroll().
+     *
+     * Clients must call this method once enrollment is complete, and the user's
+     * face template no longer needs to be updated.
+     *
+     * @return status The status of this method call.
+     */
+    @callflow(next={"authenticate", "setActiveUser", "enumerate", "remove"})
+    postEnroll() generates (Status status);
+
+    /**
+     * Returns an identifier associated with the current face set.
+     *
+     * The authenticator ID must change whenever a new face is enrolled. The
+     * authenticator ID must not be changed when a face is deleted. The
+     * authenticator ID must be an entropy-encoded random number which all
+     * current templates are tied to. The authenticator ID must be immutable
+     * outside of an active enrollment window to prevent replay attacks.
+     *
+     * @return result, with its value parameter representing an
+     *     "authenticatorId": an identifier associated to the user's current
+     *     face enrollment.
+     */
+    @callflow(next={"authenticate"})
+    getAuthenticatorId() generates (OptionalUint64 result);
+
+    /**
+     * Cancels a pending enrollment or authentication request.
+     *
+     * @return status The status of this method call.
+     */
+    @callflow(next={"authenticate", "enroll", "enumerate", "remove",
+        "setActiveUser"})
+    cancel() generates (Status status);
+
+    /**
+     * Enumerates all face templates associated with the active user.
+     *
+     * The onEnumerate() callback method is invoked once for each face template
+     * found.
+     *
+     * @return status The status of this method call.
+     */
+    @callflow(next={"remove", "enroll", "authenticate", "setActiveUser"})
+    enumerate() generates (Status status);
+
+    /**
+     * Removes a face template or all face templates associated with the active
+     * user.
+     *
+     * This method triggers the IBiometricsFaceClientCallback#onRemoved() method.
+     *
+     * @param faceId The id correpsonding to the face to be removed; or 0 if all
+     *    faces are to be removed.
+     * @return status The status of this method call.
+     */
+    @callflow(next={"enumerate", "authenticate", "cancel", "getAuthenticatorId",
+        "setActiveUser"})
+    remove(uint32_t faceId) generates (Status status);
+
+    /**
+     * Authenticates the active user.
+     *
+     * An optional operationId can be specified as a token from the transaction
+     * being authorized.
+     *
+     * @param operationId A non-zero operation id associated with a crypto
+     * object instance; or 0 if not being used.
+     * @return status The status of this method call.
+     */
+    @callflow(next={"cancel", "preEnroll", "remove"})
+    authenticate(uint64_t operationId) generates (Status status);
+};
diff --git a/biometrics/face/1.0/IBiometricsFaceClientCallback.hal b/biometrics/face/1.0/IBiometricsFaceClientCallback.hal
new file mode 100644
index 0000000..93848c5
--- /dev/null
+++ b/biometrics/face/1.0/IBiometricsFaceClientCallback.hal
@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2018 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.biometrics.face@1.0;
+
+/**
+ * This callback interface is used by clients to recieve updates from the face
+ * HAL.
+ */
+interface IBiometricsFaceClientCallback {
+
+    /**
+     * A callback invoked when one enrollment step has been completed.
+     *
+     * @param deviceId A unique id associated with the HAL implementation
+     *     service that processed this enrollment step.
+     * @param faceId The id of the face template being enrolled.
+     * @param userId The active user id for the template being enrolled.
+     * @param remaining The number of remaining steps before enrolllment is
+     *     complete or 0 if enrollment has completed successfully.
+     */
+    oneway onEnrollResult(uint64_t deviceId, uint32_t faceId, int32_t userId,
+        uint32_t remaining);
+
+    /**
+     * A callback invoked when a face has been successfully authenticated.
+     *
+     * @param deviceId A unique id associated with the HAL implementation
+     *     service that processed this autentication attempt.
+     * @param faceId The id of the face template that passed the authentication
+     *     challenge.
+     * @param userId The active user id for the authenticated face.
+     * @param token The hardware authentication token associated with this
+     *     authenticate operation.
+     */
+    oneway onAuthenticated(uint64_t deviceId, uint32_t faceId, int32_t userId,
+        vec<uint8_t> token);
+
+    /**
+     * A callback invoked when a face is acquired.
+     *
+     * If a non-critical, recoverable error occurs during an enrollment or
+     * authentication attempt, the HAL implementation must invoke this callback
+     * to allow clients to inform the user that some actionable change must be
+     * made.
+     *
+     * @param deviceId A unique id associated with the HAL implementation
+     *     service that acquired a face.
+     * @param userId The id of the active user associated with the attempted
+     *     face acquisition.
+     * @param acquiredInfo A message about the quality of the acquired image.
+     * @param vendorCode An optional vendor-specific message. This is only valid
+     *     when acquiredInfo == FaceAcquiredInfo.VENDOR. This message is opaque
+     *     to the framework, and vendors must provide code to handle it. For
+     *     example this can be used to guide enrollment in Settings or provide
+     *     a message during authentication that is vendor-specific. The vendor
+     *     is expected to provide help strings to cover all known values.
+     */
+     oneway onAcquired(uint64_t deviceId, int32_t userId,
+         FaceAcquiredInfo acquiredInfo, int32_t vendorCode);
+
+    /**
+     * A callback invoked when an error has occured.
+     *
+     * @param deviceId A unique id associated with the HAL implementation
+     *     service where this error occured.
+     * @param userId The id of the active user when the error occured, or
+     *     UserHandle::NONE if an active user had not been set yet.
+     * @param error A message about the error that occurred.
+     * @param vendorCode An optional, vendor-speicifc error message. Only valid
+     *     when error == FaceError.VENDOR. This message is opaque to the
+     *     framework, and vendors must provide code to handle it. For example,
+     *     this scan be used to show the user an error message specific to the
+     *     device. The vendor is expected to provide error strings to cover
+     *     all known values.
+     */
+    oneway onError(uint64_t deviceId, int32_t userId, FaceError error,
+        int32_t vendorCode);
+
+    /**
+     * A callback invoked when a face template has been removed.
+     *
+     * @param deviceId A unique id associated with the HAL implementation
+     *     service that processed this removal.
+     * @param faceId The id of the face template that was removed.
+     * @param userId The active user id for the removed face template.
+     * @param remaining The number of face templates remaining after this
+     *     removal, or 0 if there are no more.
+     */
+    oneway onRemoved(uint64_t deviceId, uint32_t faceId, int32_t userId,
+        uint32_t remaining);
+
+    /**
+     * A callback invoked to enumerate all current face templates.
+     *
+     * @param deviceId A unique id associated with the HAL implementation
+     *     service that processed this enumeration.
+     * @param faceIds A list of ids of all currently enrolled face templates.
+     * @param userId The active user id for the enumerated face template.
+     */
+    oneway onEnumerate(uint64_t deviceId, vec<uint32_t> faceIds,
+        int32_t userId);
+};
diff --git a/biometrics/face/1.0/types.hal b/biometrics/face/1.0/types.hal
new file mode 100644
index 0000000..08af919
--- /dev/null
+++ b/biometrics/face/1.0/types.hal
@@ -0,0 +1,255 @@
+/*
+ * Copyright (C) 2018 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.biometrics.face@1.0;
+
+/*
+ * In the event setActiveUser is not called, all error messages will return
+ * this userId.
+ */
+enum UserHandle : int32_t {
+    NONE = -1
+};
+
+/**
+ * Status codes returned directly by the HIDL method calls upon critical errors
+ * where the callback cannot be invoked. Most errors should sent through the
+ * onError callback using one of the FaceErrors below.
+ */
+enum Status : uint32_t {
+    /**
+     * The method was invoked successfully.
+     */
+    OK = 0,
+
+    /**
+     * One of the arguments to the method call is invalid.
+     */
+    ILLEGAL_ARGUMENT = 1,
+
+    /**
+     * This face HAL does not support this operation.
+     */
+    OPERATION_NOT_SUPPORTED = 2,
+
+    /**
+     * The HAL has encountered an internal error and cannot complete the request.
+     */
+    INTERNAL_ERROR = 3
+};
+
+/**
+ * Face errors represent events that can't be immediately recovered by user
+ * intervention. These are returned in the onError callback.
+ *
+ * Upon receiving a face error, clients must terminate the current operation and
+ * notify the user where possible.
+ */
+enum FaceError : int32_t {
+
+    /**
+     * A hardware error has occured that cannot be resolved. Try again later.
+     */
+    HW_UNAVAILABLE = 1,
+
+    /**
+     * The current enroll or authenticate operation could not be completed;
+     * the sensor was unable to process the current image.
+     */
+    UNABLE_TO_PROCESS = 2,
+
+    /**
+     * The current operation took too long to complete. This is intended to
+     * prevent programs from blocking the face HAL indefinitely. The timeout is
+     * framework and sensor-specific, but is generally on the order of 30
+     * seconds.
+     */
+    TIMEOUT = 3,
+
+    /**
+     * The current operation could not be completed because there is not enough
+     * storage space remaining to do so.
+     */
+    NO_SPACE = 4,
+
+    /**
+     * The current operation has been cancelled. This may happen if a new
+     * request (authenticate, remove) is initiated while an on-going operation
+     * is in progress, or if cancel() was called.
+     */
+    CANCELED = 5,
+
+    /**
+     * The current remove operation could not be completed; the face template
+     * provided could not be removed.
+     */
+    UNABLE_TO_REMOVE = 6,
+
+    /**
+     * Face authentication is locked out due to too many unsuccessful attempts.
+     */
+    LOCKOUT = 7,
+
+    /**
+     * Used to enable a vendor-specific error message.
+     */
+    VENDOR = 8,
+};
+
+/**
+ * Face acquisition information provides feedback for the current enrollment
+ * or authentication operation.
+ *
+ * This information indicates that the user can take immediate action to resolve
+ * an issue, and clients must ensure that this information is surfaced to the
+ * user.
+ */
+enum FaceAcquiredInfo : int32_t {
+
+    /**
+     * The face acquired was good; no further user interaction is necessary.
+     */
+    GOOD = 0,
+
+    /**
+     * The face data acquired was too noisy or did not have sufficient detail.
+     * This is a catch-all for all acquisition errors not captured by the other
+     * constants.
+     */
+    INSUFFICIENT = 1,
+
+    /**
+     * Because there was too much ambient light, the captured face data was too
+     * bright. It's reasonable to return this after multiple
+     * FaceAcquiredInfo.INSUFFICIENT.
+     *
+     * The user is expected to take action to retry the operation in better
+     * lighting conditions when this is returned.
+     */
+    TOO_BRIGHT = 2,
+
+    /**
+     * Because there was not enough illumination, the captured face data was too
+     * dark. It's reasonable to return this after multiple
+     * FaceAcquiredInfo.INSUFFICIENT.
+     *
+     * The user is expected to take action to retry the operation in better
+     * lighting conditions when this is returned.
+     */
+    TOO_DARK = 3,
+
+    /**
+     * The detected face is too close to the sensor, and the image cannot be
+     * processed.
+     *
+     * The user is expected to be informed to move further from the sensor when
+     * this is returned.
+     */
+    TOO_CLOSE = 4,
+
+    /**
+     * The detected face is too small, as the user might be too far away from
+     * the sensor.
+     *
+     * The user is expected to be informed to move closer to the sensor when
+     * this is returned.
+     */
+    TOO_FAR = 5,
+
+    /**
+     * Only the upper part of the face was detected. The sensor's field of view
+     * is too high.
+     *
+     * The user should be informed to move up with respect to the sensor when
+     * this is returned.
+     */
+    FACE_TOO_HIGH = 6,
+
+    /**
+     * Only the lower part of the face was detected. The sensor's field of view
+     * is too low.
+     *
+     * The user should be informed to move down with respect to the sensor when
+     * this is returned.
+     */
+    FACE_TOO_LOW = 7,
+
+    /**
+     * Only the right part of the face was detected. The sensor's field of view
+     * is too far right.
+     *
+     * The user should be informed to move to the right with respect to the
+     * sensor when this is returned.
+     */
+    FACE_TOO_RIGHT = 8,
+
+    /**
+     * Only the left part of the face was detected. The sensor's field of view
+     * is too far left.
+     *
+     * The user should be informed to move to the left with respect to the
+     * sensor when this is returned.
+     */
+    FACE_TOO_LEFT = 9,
+
+    /**
+     * The user's face was directed away from the sensor. The user should be
+     * informed to face the sensor when this is returned.
+     */
+    POOR_GAZE = 10,
+
+    /**
+     * No face was detected within the sensor's field of view.
+     *
+     * The user should be informed to point the sensor to a face when this is
+     * returned.
+     */
+    NOT_DETECTED = 11,
+
+    /**
+     * Too much motion was detected.
+     *
+     * The user should be informed to keep their face steady relative to the
+     * sensor.
+     */
+    TOO_MUCH_MOTION = 12,
+
+    /**
+     * The sensor needs to be recalibrated.
+     */
+    RECALIBRATE = 13,
+
+    /**
+     * Used to enable a vendor-specific acquisition message.
+     */
+    VENDOR = 14
+};
+
+/**
+ * Result structure with an additional uint64_t field. See documentation in
+ * setCallback(), preEnroll(), and getAuthenticatorId() for usage of the value.
+ */
+struct OptionalUint64 {
+    /**
+     * The return status.
+     */
+    Status status;
+
+    /**
+     * This value is only meaningful if status is OK.
+     */
+    uint64_t value;
+};