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crypto: delete built-in XTS cipher mode support

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The built-in AES+XTS implementation is used for the LUKS encryption
When building system emulators it is reasonable to expect that an
external crypto library is being used instead. The performance of the
builtin XTS implementation is terrible as it has no CPU acceleration
support. It is thus not worth keeping a home grown XTS implementation
for the built-in cipher backend.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2021-07-02 17:00:32 +01:00
parent 21407ddf96
commit 6801404429
3 changed files with 6 additions and 67 deletions
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7
meson.build
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@ -826,7 +826,7 @@ endif
# Nettle has priority over gcrypt
gcrypt = not_found
nettle = not_found
xts = 'private'
xts = 'none'
if get_option('nettle').enabled() and get_option('gcrypt').enabled()
error('Only one of gcrypt & nettle can be enabled')
elif (not get_option('nettle').auto() or have_system) and not get_option('gcrypt').enabled()
@ -834,8 +834,8 @@ elif (not get_option('nettle').auto() or have_system) and not get_option('gcrypt
method: 'pkg-config',
required: get_option('nettle'),
kwargs: static_kwargs)
if nettle.found() and cc.has_header('nettle/xts.h', dependencies: nettle)
xts = 'nettle'
if nettle.found() and not cc.has_header('nettle/xts.h', dependencies: nettle)
xts = 'private'
endif
endif
if (not get_option('gcrypt').auto() or have_system) and not nettle.found()
@ -843,7 +843,6 @@ if (not get_option('gcrypt').auto() or have_system) and not nettle.found()
method: 'config-tool',
required: get_option('gcrypt'),
kwargs: static_kwargs)
xts = 'gcrypt'
# Debian has removed -lgpg-error from libgcrypt-config
# as it "spreads unnecessary dependencies" which in
# turn breaks static builds...