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Move Galois polynomial shifts to block-internal.h, simplifying common
code. GCM is left unconverted for now, this will be fixed later.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* xts.c (xts_shift): Arrange with a single write to u64[1].
* cmac.c (block_mulx): Rewrite to work in the same way as
xts_shift, with 64-bit operations. XTS and CMAC use opposite
endianness, but otherwise, these two functions are identical.
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This creates two implementations of xts_shift, one for little endian and
one for big endian. This way we avoid copies to additional variables and
inefficient byteswapping on platforms that do not have dedicated
instructions.
Signed-off-by: Simo Sorce <simo@redhat.com>
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This avoids copying and may be somewhat more readable without the need
for so much explanation.
Signed-off-by: Simo Sorce <simo@redhat.com>
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XEX encryption mode with tweak and ciphertext stealing (XTS) is
standardized in IEEE 1619 and generally used for storage devices.
Signed-off-by: Simo Sorce <simo@redhat.com>
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