I'd like to be able to work out the size of the signature that would be
returned by a call to EVP_SignFinal() so that I can dynamically allocate
the memory for the signature before actually calling the function.

Any info on how to do this?   If I pass in a NULL pointer and 0 length,
I get a SEGV.  I'm using this with both RSA & DSA keys.

Thanks

-- 
Dave
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