Tutorials for OpenSSL libcrypto

i find all the openssl documentation a bit overwhelming, i've found a great introductory tutorial for using EVP functions and blowfish symmtetrical encryption algorithm, i'll prolly use that if i can't figure out how to use RSA

but my real wish would be to find some nice introduction to RSA encryption, simply because i only need to encrypt small ammounts of data, binary structs, to be stored in dbm files

and i read that rsa is great for small ammounts but for larger ammounts like whole files blowfish was faster, i also like the fact that i only have to keep one key for blowfish but i'd still like to give RSA a shot

tldr: howtos or tutorials on using RSA encryption with openssl crypto libs

heh ok...

so i guess libcrypto should only be used by people who understand cryptography, then what is the point of having a easy to use api for ssl?

i'm writing a very simple program to keep track of my economy, it will just store a structure converted to binary form using libtpl in a dbm, and for reasons i don't want to go into i wanted the information encrypted

i've written a notes program before that used gnupg to encrypt and decrypt the dbm but that left the file content unencrypted while the program was running, wheather in memory or on disk

so i figured i'd use openssl for the first time ever to learn a bit about libcrypto for future reference, so i decided i want to encrypt the binary data libtpl produces of my structure before i store it in the dbm

one thing i need to read up on is the cipher, because i want a password to be input when the program starts in order to decrypt the files data, i assume this password can generate or unlock the cipher in some way but i'll have to read more about that