effient ways to sign and verify signatures using openssl

[Frank]

I'm trying to determine the most efficient way to sign data and verify 
the signature using openssl. I want to use SHA1 and DSS. I have this 
working now, something Dr Henson gave me before.  Just tring to fid and 
ways to make it more effient at this operation as I'm signing and verify 
all messages.  I using the following functions:

EVP_SignInit()
EVP_SignUpdate()
EVP_SignFinal()
To sign And
EVP_VerifyInit()
EVP_VerifyUpdate()
EVP_VerifyFinal()
to verify the signatures.
Now I have a couple of questions.
1. Since I will have some  person signing different data each time is it 
suggested to still call EVP_MD_CTX_cleanup() between signing  the 
different msgs or don't bother to clean it up as it will be reused? I'm 
think  I do since it's a product of the data you are signing.
2. Any  need to call EVP_cleanup() after each signing?
3.  Same goes when verify the data, do I need to call these functions to 
cleanup after wards? I think I do but want to make sure.

Thanks,
Frank


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