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crypto: flip priority of backends to prefer gcrypt

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Originally we preferred to use nettle over gcrypt because
gnutls already links to nettle and thus it minimizes the
dependencies. In retrospect this was the wrong criteria to
optimize for.

Currently shipping versions of gcrypt have cipher impls that
are massively faster than those in nettle and this is way
more important.  The nettle library is also not capable of
enforcing FIPS compliance, since it considers that out of
scope. It merely aims to provide general purpose impls of
algorithms, and usage policy is left upto the layer above,
such as GNUTLS.

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 14:18:12 +01:00
parent 83bee4b51f
commit 260a13d472
1 changed files with 11 additions and 11 deletions
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22
meson.build
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@ -823,22 +823,13 @@ if not get_option('gnutls').auto() or have_system
kwargs: static_kwargs)
endif
# Nettle has priority over gcrypt
# Gcrypt has priority over nettle
gcrypt = not_found
nettle = not_found
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()
nettle = dependency('nettle', version: '>=3.4',
method: 'pkg-config',
required: get_option('nettle'),
kwargs: static_kwargs)
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()
elif (not get_option('gcrypt').auto() or have_system) and not get_option('nettle').enabled()
gcrypt = dependency('libgcrypt', version: '>=1.8',
method: 'config-tool',
required: get_option('gcrypt'),
@ -852,6 +843,15 @@ if (not get_option('gcrypt').auto() or have_system) and not nettle.found()
cc.find_library('gpg-error', required: true, kwargs: static_kwargs)])
endif
endif
if (not get_option('nettle').auto() or have_system) and not gcrypt.found()
nettle = dependency('nettle', version: '>=3.4',
method: 'pkg-config',
required: get_option('nettle'),
kwargs: static_kwargs)
if nettle.found() and not cc.has_header('nettle/xts.h', dependencies: nettle)
xts = 'private'
endif
endif
gtk = not_found
gtkx11 = not_found