• Herbert Xu's avatar
    [CRYPTO] Add alignmask for low-level cipher implementations · 95477377
    Herbert Xu authored
    The VIA Padlock device requires the input and output buffers to
    be aligned on 16-byte boundaries.  This patch adds the alignmask
    attribute for low-level cipher implementations to indicate their
    alignment requirements.
    
    The mid-level crypt() function will copy the input/output buffers
    if they are not aligned correctly before they are passed to the
    low-level implementation.
    
    Strictly speaking, some of the software implementations require
    the buffers to be aligned on 4-byte boundaries as they do 32-bit
    loads.  However, it is not clear whether it is better to copy
    the buffers or pay the penalty for unaligned loads/stores.
    Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    95477377
api.c 4.49 KB