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As has been done for various other algorithms, rework the design of the
SHA-256 library to support arch-optimized implementations, and make
crypto/sha256.c expose both generic and arch-optimized shash algorithms
that wrap the library functions.
This allows users of the SHA-256 library functions to take advantage of
the arch-optimized code, and this makes it much simpler to integrate
SHA-256 for each architecture.
Note that sha256_base.h is not used in the new design. It will be
removed once all the architecture-specific code has been updated.
Move the generic block function into its own module to avoid a circular
dependency from libsha256.ko => sha256-$ARCH.ko => libsha256.ko.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Add export and import functions to maintain existing export format.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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