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emboss/gist:3253173

Created August 4, 2012 00:58
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  1. emboss created this gist Aug 4, 2012.
    25 changes: 25 additions & 0 deletions gistfile1.rb
    View file
    Original file line number Diff line number Diff line change
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    require 'openssl'

    group = OpenSSL::PKey::EC::Group.new('prime256v1')
    generator = group.generator #the generator point

    ec = OpenSSL::PKey::EC.new
    ec.group = group
    ec.generate_key #generate a key pair

    priv = ec.private_key #this is a random number, a OpenSSL::BN

    # the public point P is given by P = priv * G,
    # where s is the private key and G is the generator point
    pub_point = generator.mul(priv)

    puts ec.public_key == pub_point # true, now convert the point to an EC

    pub_ec = OpenSSL::PKey::EC.new
    pub_ec.group = group
    pub_ec.public_key = pub_point

    puts ec.to_text
    puts pub_ec.to_text #pub parts are equal!

    puts pub_ec.to_pem #to serialize it in PEM format