class OpenSSL::PKey::EC

def self.read_keyblob(curve_name_in_type, buffer)
  curve_name_in_key = buffer.read_string
  unless curve_name_in_type == curve_name_in_key
    raise Net::SSH::Exception, "curve name mismatched (`#{curve_name_in_key}' with `#{curve_name_in_type}')"
  end
  public_key_oct = buffer.read_string
  begin
    curvename = OpenSSL::PKey::EC::CurveNameAlias[curve_name_in_key]
    group = OpenSSL::PKey::EC::Group.new(curvename)
    point = OpenSSL::PKey::EC::Point.new(group, OpenSSL::BN.new(public_key_oct, 2))
    asn1 = OpenSSL::ASN1::Sequence(
      [
        OpenSSL::ASN1::Sequence(
          [
            OpenSSL::ASN1::ObjectId("id-ecPublicKey"),
            OpenSSL::ASN1::ObjectId(curvename)
          ]
        ),
        OpenSSL::ASN1::BitString(point.to_octet_string(:uncompressed))
      ]
    )
    key = OpenSSL::PKey::EC.new(asn1.to_der)
    return key
  rescue OpenSSL::PKey::ECError
    raise NotImplementedError, "unsupported key type `#{type}'"
  end
end