crypto: add support for the twofish cipher algorithm
New cipher algorithms 'twofish-128', 'twofish-192' and 'twofish-256' are defined for the Twofish algorithm. The gcrypt backend does not support 'twofish-192'. The nettle and gcrypt cipher backends are updated to support the new cipher and a test vector added to the cipher test suite. The new algorithm is enabled in the LUKS block encryption driver. Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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