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[70.77.221.9]) by smtp.gmail.com with ESMTPSA id j10sm7443564pjs.11.2021.03.20.02.05.57 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 20 Mar 2021 02:05:58 -0700 (PDT) From: Andreas Dilger Message-Id: <0399B7C7-D6A1-4A92-ABDD-1EA13C80007E@dilger.ca> Content-Type: multipart/signed; boundary="Apple-Mail=_18E6BF6C-9AA5-4C4D-A623-B79DF40D07C7"; protocol="application/pgp-signature"; micalg=pgp-sha256 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Subject: Re: [PATCH v2 1/2] ext4: Handle casefolding with encryption Date: Sat, 20 Mar 2021 03:05:54 -0600 In-Reply-To: <20210319073414.1381041-2-drosen@google.com> Cc: "Theodore Y . Ts'o" , Eric Biggers , Ext4 Developers List , Linux Kernel Mailing List , linux-fsdevel , Gabriel Krisman Bertazi , kernel-team@android.com To: Daniel Rosenberg References: <20210319073414.1381041-1-drosen@google.com> <20210319073414.1381041-2-drosen@google.com> X-Mailer: Apple Mail (2.3273) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --Apple-Mail=_18E6BF6C-9AA5-4C4D-A623-B79DF40D07C7 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii On Mar 19, 2021, at 1:34 AM, Daniel Rosenberg wrote: > > This adds support for encryption with casefolding. > > Since the name on disk is case preserving, and also encrypted, we can no > longer just recompute the hash on the fly. Additionally, to avoid > leaking extra information from the hash of the unencrypted name, we use > siphash via an fscrypt v2 policy. > > The hash is stored at the end of the directory entry for all entries > inside of an encrypted and casefolded directory apart from those that > deal with '.' and '..'. This way, the change is backwards compatible > with existing ext4 filesystems. > > Signed-off-by: Daniel Rosenberg Reviewed-by: Andreas Dilger Cheers, Andreas --Apple-Mail=_18E6BF6C-9AA5-4C4D-A623-B79DF40D07C7 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iQIzBAEBCAAdFiEEDb73u6ZejP5ZMprvcqXauRfMH+AFAmBVuvIACgkQcqXauRfM H+CgSQ//TQ7/Yghzj7rHH0WAVnnYsTzF+puQeZV1rw/Uxa5I7oo/ldzng2TGjtrh dcNuJ42WRwCulz2qqmZB9UQSiU5KjlCMXsm2ELtCabY8XwRLvaLb+YsZRfnTB4nS IC/MBwAZy2u1j5nYuS0jZGE9o1WG/cgMTsb4ob5HH4nHhgRveRqnK7ts7bGJ0lZZ RMAWc+eUa1bE2vP0sDZqCoKL/1fBfuEEY3dCXigz/CpyTU46FeYT/Wjkm7qWkB2d txYZWKgUfVdXAIIWJI0jXExgsUDM5qyNvX+HKXMoxld5RQp1sN2tB2Wt9w62Jle7 BnVOsIXDqSTmQVOJrmwEut2H+jaF9K+HZtx+43J/KPdkczpY+GPg/S4DIVkTWTVH 10xnItp08XL46+8bHLjq9YDVWf+PP08UFu41UQx6wZtXmWlpOfUxH/wCvw3+lJEy /OM/bFoaJPx2UMGUCeaXibFnTTsq1w2bia2pWOcn55AITEV2EFRs5HPM7s6pjtCf yHCwbWiB+qIqS2Brc4kTm7l+HTbN43yUhC4zwnjror4w07OvVbK/OHvyJ2ET4HEJ lyvz0M+2yS9iu90VbwnpBcTU3gHCmZyjNRM76AEUiu3NSKZk02Sc7wd2U+vvmU4z IsumbcZeDZAhE4j+/aBBtebBgiLu6xeK+cy6rtE+/NSNkfoWH+8= =n6Sd -----END PGP SIGNATURE----- --Apple-Mail=_18E6BF6C-9AA5-4C4D-A623-B79DF40D07C7--