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Add FIPS 202 SHA-3 hash signature support in x509 certificates, pkcs7
signatures, and authenticode signatures. Supports hashes of size 256
and up, as 224 is too weak for any practical purposes.
Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>