I used the openssl command line program to generate some keys and to sign some data. I'm now trying to use a c++ program that will verify the signing of these files with the public key. I know about the EVP_VerifyInit function and a few others, but I'm not sure how the EVP_PKEY object works and also, can I just read in the data files created by the openssl command line and pass them to the functions, or do the functions require the data to be formated a certain way?