zfs/lib
Rob Norris d9d69c1b97 Chacha20-Poly1305 encryption
This commit implements the Chacha20-Poly1305 AEAD from RFC 8439 as a new
algorithm option for encrypted datasets.

AES (and particularly the default AES-GCM mode used in OpenZFS) is known
to be very slow on systems without hardware assistance. There are many
such machines out there could make good use of OpenZFS, especially
low-cost machines and small boards that would otherwise make very nice
storage machines. The Raspberry Pi series of machines are a good
example.

The best option for these systems is an encryption option that performs
well in software. Chacha20-Poly1305 is the current "standard" option for
this in many contexts, and is a good choice for OpenZFS.

The core Chacha20 and Poly1305 implementations are taken from Loup
Valliant's Monocypher. These were chosen because they are compact, easy
to read, easy to use and the author has written extensively about its
development, all of which give me confidence that there are unlikely to
be any surprises.

I've added a KCF-style module to the ICP to implement the AEAD. This
implements just enough for OpenZFS, and is not suitable as a
general-purpose KCF for Illumos (though it could be the starting point
for one).

For FreeBSD, which does not use the ICP, I've instead hooked it up to
FreeBSD's builtin crypto stack.

The rest is adding an enabling property value and a feature flag and and
hooking it up to all the right touch points, and documentation updates.

The existing tests that cycle through the possible encryption options
have been extended to add one more.

I've added a test to ensure that raw receives of chacha20-poly1305
datasets do the right thing based on the state of the feature flag on
the receiving side.

There's also a test unit that runs the test vectors in RFC 8439 against
Chacha20, Poly1305 and the AEAD in the ICP that combines them. This is
most useful as a sanity check during future work to add alternate
(accelerated) implementations.

Finally, manual interop testing has been done to confirm that pools and
streams can be moved between Linux and FreeBSD correctly.

Light and uncontrolled performance testing on a Raspberry Pi 4B
(Broadcom BCM2711, no hardware AES) writing to a chacha20-poly1305
dataset was ~2.4x faster than aes-256-gcm on the same hardware. On a
Fitlet2 (Celeron J3455, AES-NI but no AVX (#10846)) it was ~1.3x faster.

Sponsored-by: https://despairlabs.com/sponsor/
Signed-off-by: Rob Norris <robn@despairlabs.com>
2024-09-05 08:37:24 +10:00
..
libavl cppcheck: explicitly exclude kernel code from userspace checks 2022-05-10 10:20:55 -07:00
libefi Replace P2ALIGN with P2ALIGN_TYPED and delete P2ALIGN. 2024-05-10 08:47:21 -07:00
libicp Chacha20-Poly1305 encryption 2024-09-05 08:37:24 +10:00
libnvpair libspl: lift backtrace into a separate file 2024-05-14 09:48:45 -07:00
libshare Add support for multiple lines to the sharenfs property for FreeBSD (#16338) 2024-07-23 16:38:19 -07:00
libspl JSON output support for zpool status 2024-08-06 12:47:10 -07:00
libtpool tpool_dispatch: fail if it cannot start at least 1 worker. 2024-05-14 09:35:48 -07:00
libunicode cppcheck: explicitly exclude kernel code from userspace checks 2022-05-10 10:20:55 -07:00
libuutil JSON output support for zpool status 2024-08-06 12:47:10 -07:00
libzdb Provide macros for setting and getting blkptr birth times 2024-03-25 15:01:54 -07:00
libzfs Chacha20-Poly1305 encryption 2024-09-05 08:37:24 +10:00
libzfs_core Add DDT prune command 2024-09-04 14:17:02 -07:00
libzfsbootenv nvpair: Constify string functions 2023-03-14 15:25:50 -07:00
libzpool build: rename FORCEDEBUG_CPPFLAGS to LIBZPOOL_CPPFLAGS 2024-08-27 12:53:27 -07:00
libzstd cppcheck: explicitly exclude kernel code from userspace checks 2022-05-10 10:20:55 -07:00
libzutil libzfs: use zfs_strerror() in place of strerror() 2024-01-29 09:54:57 -08:00
Makefile.am libzdb: Initial breakout of libzdb 2024-02-05 10:00:41 -08:00