Being able to load/save the digest state is a good idea. Management of
the buffer should be left to the caller, however. Much simpler and
cleaner that way. For example, work like the DER/i2d routines: if given a
NULL pointer, return how much space is needed. Or provide something like
the RSA_size function which tells you how much space is needed to store
the state.

Then you only need get_state and set_state which read/write a buffer of
the appropriate size. Very simple.

/r$

--
STSM, Senior Security Architect
DataPower SOA Appliances
http://www.ibm.com/software/integration/datapower/

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