On Wed, Dec 23, 2015 at 10:18:55PM +0000, Dr. Stephen Henson wrote:
> That's an interesting question. What digest requires this? Is the output
> length arbitrary or do the standards specify a maximum size?
With SHA3, NIST differentiates between fixed-length hash functions
and variable-length XOFs.
Introduction of variable length digests into OpenSSL would break
applications that expect the EVP_MD family of functions to produce
fixed length (input data indepdendent) results.
If there's a new construct whose output size depends on the input
data, that probably requires a new family of functions.
--
Viktor.
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