class JWT::JWK::EC

def keypair_components(ec_keypair)
  encoded_point = ec_keypair.public_key.to_bn.to_s(BINARY)
  case ec_keypair.group.curve_name
  when 'prime256v1'
    crv = 'P-256'
    x_octets, y_octets = encoded_point.unpack('xa32a32')
  when 'secp256k1'
    crv = 'P-256K'
    x_octets, y_octets = encoded_point.unpack('xa32a32')
  when 'secp384r1'
    crv = 'P-384'
    x_octets, y_octets = encoded_point.unpack('xa48a48')
  when 'secp521r1'
    crv = 'P-521'
    x_octets, y_octets = encoded_point.unpack('xa66a66')
  else
    raise JWT::JWKError, "Unsupported curve '#{ec_keypair.group.curve_name}'"
  end
  [crv, x_octets, y_octets]
end