I would to know how to generate a key with the ECDSA algorithm from
openssl or do I have to use the ECDH algorithm for that? If I have
to use ECDH, how do I generate a key? ECDH is only to share a
secret key.
Neither ECDSA or ECDH will generate an EC key. Assuming you have a
key, ECDSA is used to sign a document, and ECDH is used in various
ways, but ultimately to have both parties agree on a symmetric key.
You will want to read up on signatures and key agreement/key
exchange. May I suggest starting with...
http://en.wikipedia.org/wiki/Elliptic_Curve_DSA
http://en.wikipedia.org/wiki/Elliptic_Curve_Diffie-Hellman
Here are a few clues on how to do an EC keygen. It is abbreviated
from a Python wrapper I'm writing but you should be able to figure out
the correct C data types.
curveName = 'prime256v1'
curveNID = OBJ_sn2nid(curveName)
key = EC_KEY_new_by_curve_name(curveNID)
EC_KEY_generate_key(key)
An other question: I am doing cryptograhy with EDCSA an/or ECDH I
would like
to use less code lines from openssl as possible. What should I keep
or leave
from the code.
What you keep or can safely discard depends on what it is you are
trying to accomplish. Perhaps you can be more specific?
Larry
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