Hi all, This week i was in doubt to implemment some methods to sign using OpenSSL. I know that RSA needs the hash algorithm to do the padding scheme and ECDSA doesn't need. Another thing that i know is that RSA can only sign things that are smaller than the size of the key used. I can imagine that the encrypt process follows the same idea. I know that to sign, i have to take a hash of some document or message but, theoretically, i could encrypt any document? The padding scheme would shrink the message and them could reveal the same message after deciphering? My doubt is: and ECDSA? Does it has the same features? I know it doesn't needs the hash algorithm, but the message needs to be smaller than the size of the key? ECDSA signs a message with any size? Example: an ecdsa key with 192 bits signing a hash sha 512. It could be signed or it is wrong?
Thanks, -- Rick Lopes de Souza
