Support encrypted backup files

Also includes features merged from:

Update twrpTar by kokotas

Revised function entryExists().
Added function to get archive's uncompressed size.
Added option to exclude item(s) from the archive.
Revised forks()

http://review.teamw.in/#/c/590/

Change-Id: I01fa2c81643161984eff2625247af75990684bd9
diff --git a/openaes/Android.mk b/openaes/Android.mk
new file mode 100644
index 0000000..1beefda
--- /dev/null
+++ b/openaes/Android.mk
@@ -0,0 +1,26 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+ifneq ($(TW_EXCLUDE_ENCRYPTED_BACKUPS), true)
+	LOCAL_SRC_FILES:= src/oaes.c \
+	LOCAL_C_INCLUDES := \
+		bootable/recovery/openaes/src/isaac \
+		bootable/recovery/openaes/inc
+	LOCAL_CFLAGS:= -g -c -W
+	LOCAL_MODULE:=openaes
+	LOCAL_MODULE_TAGS:= eng
+	LOCAL_MODULE_CLASS := RECOVERY_EXECUTABLES
+	LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/sbin
+	LOCAL_SHARED_LIBRARIES = libopenaes libc
+	include $(BUILD_EXECUTABLE)
+
+	include $(CLEAR_VARS)
+	LOCAL_MODULE := libopenaes
+	LOCAL_MODULE_TAGS := eng
+	LOCAL_C_INCLUDES := \
+		bootable/recovery/openaes/src/isaac \
+		bootable/recovery/openaes/inc
+	LOCAL_SRC_FILES = src/oaes_lib.c src/isaac/rand.c
+	LOCAL_SHARED_LIBRARIES = libc
+	include $(BUILD_SHARED_LIBRARY)
+endif