spkac{string | Buffer | TypedArray | DataView}- Returns: {Buffer} The public key component of the
spkacdata structure, which includes a public key and a challenge.
const cert = require('crypto').Certificate();const spkac = getSpkacSomehow();const publicKey = cert.exportPublicKey(spkac);console.log(publicKey);// Prints: the public key as <Buffer ...>
