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sha224 does not provide enough security against collision attacks relative to the default keys used for signing (RSA 4k & P-384). Also sha224 never became popular, as sha256 got widely adopter ahead of sha224 being introduced. Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>