|author||Amin Hassani <firstname.lastname@example.org>||Thu Aug 13 10:49:19 2020 -0700|
|committer||Mike Frysinger <email@example.com>||Tue Aug 18 06:06:28 2020 +0000|
Replace all tabs with proper whitespace This change removes all tabs and replaces them with proper whitespaces for everywhere that the previous clang-format could not fix. This is done manually without any automatic tools. Also replaces the LICENSE file to  which has a better formatting.  - https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt BUG=chromium:886953 TEST=repo upload passes TEST=CQ passes Change-Id: I329d332e8bf40ba757df5bd86e1cc1192d71bbb3 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dm-verity/+/2353061 Tested-by: Amin Hassani <firstname.lastname@example.org> Reviewed-by: Mike Frysinger <email@example.com> Reviewed-by: Jorge Lucangeli Obes <firstname.lastname@example.org>
Verity is the userspace tool for creating integrity hashes for a device image.
This tool is a frontend for dm-bht, a device-mapper friendly block hash table structure. `verity' produces dm-bht-based images for use with dm-verity. The dm-verity module provides a transparent, integrity-checking layer over a given block device. This expects a backing device and a secondary device which provides cryptographic digests of the blocks on the primary device
Note, the secondary device image can be appended to the primary device or used as a standalone device.
This tool creates an image of the format:
Upon completion, the hash of the root hash will be printed to standard out. The root hash, tree depth, number of hashed blocks, and cryptographic hash algorithm used must be supplied to the dm-verity when configuring a device.
To build outside of Chromium OS:
./verity mode depth alg image hash_image [root_hexdigest]
dd if=/dev/zero of=/tmp/image bs=4k count=512 ./verity create 2 sha256 /tmp/image /tmp/hash | tee table # ... cat table ls -la /tmp/hash
All the source code is licensed GPLv2 to be completely kernel compatible. The Makefiles are from the parent project and are licensed under a BSD-style license.