PKCS7_verify() with zero length input

[Brad Hards]

I'm trying to do detached CMS signatures and verification using the 
PKCS7_sign() and PKCS7_verify() functions. It appears to work OK, except that 
my test case for a zero length array fails to verify() - looks like the 
signature is OK though.

The documentation suggests that PKCS7_verify() isn't expected to work ("indata 
cannot be NULL"). Are there any alternative functions that I should be 
looking at? Or is there some workaround?

Brad

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