Generating HMAC keys

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Generating HMAC keys

Julien ALLANOS
Hello,

I'm new to OpenSSL, and I want to generate a key to use with HMAC(). What
function can I use to generate such a key, and how many bytes must it be?
Can I also store the key to a file and are there functions to store and retrieve
the fey from a file? Thanks for your help.
--
Julien ALLANOS
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