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

>>9
well to be honest i don't know enough about cryptology or math to understand why i would need asymmetric encryption more, blowfish seems enough for my needs, the only thing that made me want to find information about rsa in libcrypto was a tutorial that said blowfish was better for whole files and much data while rsa was better for short pieces of encrypted data

but i plan on having a lot of short pieces of encrypted data in my dbm files and the program will be encrypting and decrypting a lot so if blowfish is faster like >>7 said then i guess i'll just run with it