Hello, To generate EC key pair you should: - choose EC curve (eg secp256r1, secp384r1, ...) - generate private key: d = random(0,...,n) (0 < d < n) - generate public key dG = d*G
where n = generator order, G = generator. If you have private key d then you should calculate public key dG = d*G using chosen EC curve. Best regards, -- Marek Marcola <marek.marc...@malkom.pl> owner-openssl-us...@openssl.org wrote on 04/14/2012 12:32:22 PM: > opensshelpmeplz <okayh...@mailinator.com> > Sent by: owner-openssl-us...@openssl.org > > 04/15/2012 02:24 PM > > Please respond to > openssl-users@openssl.org > > To > > openssl-users@openssl.org > > cc > > Subject > > ECC generate public key with given private key > > > I need to generate a public EC key given a private EC key that I provide > myself. Is it possible to do this with OpenSSL? I have no problems to > generate a key pair , and I know how to set private and public key to > specific values, but is there some way to give it a private key and get a > corresponding public key that is tied to the provided private key? I am > using the Ruby wrapper for what it is worth.... > > thanks for any help, I have spent many hours trying to figure this out now. > -- > View this message in context: http://old.nabble.com/ECC-generate-public-key-with-given- > private-key-tp33686367p33686367.html > Sent from the OpenSSL - User mailing list archive at Nabble.com. > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List openssl-users@openssl.org > Automated List Manager majord...@openssl.org ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
