howto do a hash

[Moritz Schulte]

> What I don't know now is how to correctly create this 'context'? Everywhere 
> this is a 'pointer to void', and I cannot read the how.

Why are you trying to fiddle around with Libgcrypt internals instead of
using the exported programing interface as it is documented in the manual?

Have a look at the manual and the included test programs.

To answer your specific question about the origin of the hash context:
the gcry_md_spec_t structure contains the info about the required size
for the context buffer.  This is allocated in md.c and then initialized
with the algorithm-specific initialization function (also contained in
that struct).

Hope that helps,
moritz

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