createECDH

In io.js or node >= 0.11 this module is just a shortcut to crypto.createECDH. In node <= 0.11 or the browser this is a pure JavaScript implimentation, more specifically a wrapper around elliptic, to give it the same API as node. secp256k1, secp224r1 (aka p-224), prime256v1 (aka p-256, secp256r1), prime192v1 (aka p-192, secp192r1) curves all work in both this library and node (though only the highlighted name will work in node).