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Currently the simplest use of the shash API is to use
crypto_shash_digest() to digest a whole buffer. However, this still
requires allocating a hash descriptor (struct shash_desc). Many users
don't really want to preallocate one and instead just use a one-off
descriptor on the stack like the following:
{
SHASH_DESC_ON_STACK(desc, tfm);
int err;
desc->tfm = tfm;
err = crypto_shash_digest(desc, data, len, out);
shash_desc_zero(desc);
}
Wrap this in a new helper function crypto_shash_tfm_digest() that can be
used instead of the above.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
822a98b862