universal7870: enable FBE

Signed-off-by: steadfasterX <steadfasterX@gmail.com>

device-common.mk

@@ -292,6 +292,12 @@ BUILD_FINGERPRINT := "samsung/j5y17ltexx/j5y17lte:9/PPR1.180610.011/J530FXXS7CTF
 # Properties
 -include $(LOCAL_PATH)/vendor_prop.mk
 
+# set correct adoptable storage crypto modes
+# see: https://source.android.com/security/encryption/file-based#enabling-fbe-on-adoptable-storage
+PRODUCT_PROPERTY_OVERRIDES += \
+    ro.crypto.volume.contents_mode="aes-256-xts" \
+    ro.crypto.volume.filenames_mode="aes-256-cts"
+
 # custom OTA server
 PRODUCT_PROPERTY_OVERRIDES += \
     lineage.updater.uri=http://sfxota.binbash.rocks:8009/e-os/a10/api/v1/{device}/{type}/{incr}

rootdir/etc/fstab.samsungexynos7870

@@ -8,7 +8,7 @@
 #/dev/block/platform/13540000.dwmmc0/by-name/SYSTEM	        /system			ext4		ro,errors=panic		wait
 /dev/block/platform/13540000.dwmmc0/by-name/CACHE		/cache			ext4		noatime,nosuid,nodev,noauto_da_alloc,discard,journal_checksum,data=ordered,errors=panic		wait,check
 /dev/block/platform/13540000.dwmmc0/by-name/CACHE		/cache			f2fs      	noatime,nosuid,nodev,noatime,inline_xattr                 					wait,check
-/dev/block/platform/13540000.dwmmc0/by-name/USERDATA	        /data			ext4		noatime,nosuid,nodev,noauto_da_alloc,discard,journal_checksum,data=ordered,errors=panic		wait,check,encryptable=/dev/block/platform/13540000.dwmmc0/by-name/TOMBSTONES,quota,reservedsize=128M,length=-20480
+/dev/block/platform/13540000.dwmmc0/by-name/USERDATA	        /data			ext4		noatime,nosuid,nodev,noauto_da_alloc,discard,journal_checksum,data=ordered,errors=panic		wait,check,quota,reservedsize=128M,length=-20480,fileencryption=aes-256-xts:aes-256-cts,latemount,encryptable=footer
 /dev/block/platform/13540000.dwmmc0/by-name/USERDATA	        /data			f2fs      	noatime,nosuid,nodev,discard,noatime,inline_xattr						wait,check,encryptable=/dev/block/platform/13540000.dwmmc0/by-name/TOMBSTONES,quota,reservedsize=128M,length=-20480
 /dev/block/platform/13540000.dwmmc0/by-name/EFS			/mnt/vendor/efs	        ext4		noatime,nosuid,nodev,noauto_da_alloc,discard,journal_checksum,data=ordered,errors=panic		wait,check