Dear Stephen and Victor, On Thu, Dec 24, 2015 at 1:37 AM, Viktor Dukhovni <openssl-us...@dukhovni.org > wrote:
> 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? > I mean the gost-mac digest (implemented in the ccgost engine, engines/ccgost/gost_crypt.c). It allows the output to vary from 1 to 8 bytes, though 4 bytes is the most common value. We've added the control values implementing the variable length in our repository (https://github.com/gost-engine/engine) > > 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. > Well, the gost-mac is treated specially itself and may be it can be simplified introducing the new construction. Thank you! -- SY, Dmitry Belyavsky
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