diff --git a/gatekeeper/1.0/IGatekeeper.hal b/gatekeeper/1.0/IGatekeeper.hal
new file mode 100644
index 0000000..999a311
--- /dev/null
+++ b/gatekeeper/1.0/IGatekeeper.hal
@@ -0,0 +1,108 @@
+package android.hardware.gatekeeper@1.0;
+
+interface IGatekeeper {
+
+/**
+ * Enrolls desiredPassword, which may be derived from a user selected pin
+ * or password, with the private key used only for enrolling authentication
+ * factor data.
+ *
+ * If there was already a password enrolled, current password handle must be
+ * passed in currentPasswordHandle, and current password must be passed in
+ * currentPassword. Valid currentPassword must verify() against
+ * currentPasswordHandle.
+ *
+ * @param uid The Android user identifier
+ *
+ * @param currentPasswordHandle The currently enrolled password handle the user
+ *    wants to replace. May be empty only if there's no currently enrolled
+ *    password. Otherwise must be non-empty.
+ *
+ * @param currentPassword The user's current password in plain text.
+ *    it MUST verify against current_password_handle if the latter is not-empty
+ *
+ * @param desiredPassword The new password the user wishes to enroll in
+ *    plaintext.
+ *
+ * @return response
+ *    On success, data buffer must contain the new password handle referencing
+ *    the password provided in desiredPassword.
+ *    This buffer can be used on subsequent calls to enroll or
+ *    verify. On error, this buffer must be empty.
+ *    response.code must always contain operation completion status.
+ *    This method may return ERROR_GENERAL_FAILURE or ERROR_RETRY_TIMEOUT on
+ *    failure. It must return STATUS_OK on success.
+ *    If ERROR_RETRY_TIMEOUT is returned, response.timeout must be non-zero.
+ */
+enroll(uint32_t uid,
+       vec<uint8_t> currentPasswordHandle,
+       vec<uint8_t> currentPassword,
+       vec<uint8_t> desiredPassword)
+    generates (GatekeeperResponse response);
+
+/**
+ * Verifies that providedPassword matches enrolledPasswordHandle.
+ *
+ * Implementations of this module may retain the result of this call
+ * to attest to the recency of authentication.
+ *
+ * On success, returns verification token in response.data, which shall be
+ * usable to attest password verification to other trusted services.
+ *
+ * @param uid The Android user identifier
+ *
+ * @param challenge An optional challenge to authenticate against, or 0.
+ *    Used when a separate authenticator requests password verification,
+ *    or for transactional password authentication.
+ *
+ * @param enrolledPasswordHandle The currently enrolled password handle that
+ *    user wishes to verify against. Must be non-empty.
+ *
+ * @param providedPassword The plaintext password to be verified against the
+ *    enrolledPasswordHandle
+ *
+ * @return response
+ *    On success, a non-empty data buffer containing the
+ *    authentication token resulting from this verification is returned.
+ *    On error, data buffer must be empty.
+ *    response.code must always contain operation completion status.
+ *    This method may return ERROR_GENERAL_FAILURE or ERROR_RETRY_TIMEOUT on
+ *    failure. It must return STATUS_OK on success.
+ *    If password re-enrollment is necessary, it must return STATUS_REENROLL.
+ *    If ERROR_RETRY_TIMEOUT is returned, response.timeout must be non-zero.
+ */
+verify(uint32_t uid, uint64_t challenge,
+       vec<uint8_t> enrolledPasswordHandle,
+       vec<uint8_t> providedPassword)
+    generates (GatekeeperResponse response);
+
+/*
+ * Deletes the enrolledPasswordHandle associated with the uid. Once deleted
+ * the user cannot be verified anymore.
+ * This is an optional method.
+ *
+ * @param uid The Android user identifier
+ *
+ * @return response
+ *    response.code must always contain operation completion status.
+ *    This method may return ERROR_GENERAL_FAILURE or ERROR_RETRY_TIMEOUT on
+ *    failure. It must return STATUS_OK on success.
+ *    If not implemented, it must return ERROR_NOT_IMPLEMENTED.
+ *    If ERROR_RETRY_TIMEOUT is returned, response.timeout must be non-zero.
+ */
+deleteUser(uint32_t uid) generates (GatekeeperResponse response);
+
+/*
+ * Deletes all the enrolled_password_handles for all uid's. Once called,
+ * no users must be enrolled on the device.
+ * This is an optional method.
+ *
+ * @return response
+ *    response.code must always contain operation completion status.
+ *    This method may return ERROR_GENERAL_FAILURE or ERROR_RETRY_TIMEOUT on
+ *    failure. It must return STATUS_OK on success.
+ *    If not implemented, it must return ERROR_NOT_IMPLEMENTED.
+ *    If ERROR_RETRY_TIMEOUT is returned, response.timeout must be non-zero.
+ */
+deleteAllUsers() generates (GatekeeperResponse response);
+};