Support for ecdsa keys disabled

[rushglen]

• OpenPGP.js version: 5.5.0
• Node.js node-v16.13.1-x64
  (Also tried openpgp5.0.1 using Windows 11 (same results))

I am getting an error using these ECC types:
Summary: Support for ecdsa keys using curve brainpoolP256r1,'brainpoolP384r1','brainpoolP512r1','secp256k1' is disabled

ie if I tried to use brainpoolP256r1 I would get the error : Support for ecdsa keys using curve brainpoolP256r1 is disabled.

`options = {
type: 'ecc',
curve: curveName,
userIDs: userIDs,
passphrase: passphrase,
}

const keys = await openpgp.generateKey(options);
`

These curves work:
['curve25519','ed25519','p256','p384','p521']
Is this a bug?

Error: Error generating keypair: Support for ecdsa keys using curve brainpoolP256r1 is disabled.
at ec (D:\node\node_modules\openpgp\dist\node\openpgp.min.js:2:314252)
at D:\node\node_modules\openpgp\dist\node\openpgp.min.js:16:137932
at Array.forEach ()
at exports.generateKey (D:\node\node_modules\openpgp\dist\node\openpgp.min.js:16:137906)
at async keygen (D:\node\server\generateKeys.js:37:15)
at async D:\node\server\index.js:439:23

[twiss]

Hey 👋 It's not really a bug in the sense that it was intentional, because these curves weren't in the specification; however, the Brainpool curves have now been added to the crypto refresh draft, so we'll enable them by default in the next release (#1563). The secp256k1 curve will remain disabled by default, as it's not specified for use with OpenPGP anywhere.

You can enable curves by doing something like

openpgp.config.rejectCurves.delete(openpgp.enums.curve.brainpoolP256r1);

Or, you can pass a rejectCurves set to the config of one specific function call; for example, if you want to enable all of them, you can pass:

options = {
  config: {
    rejectCurves: new Set()
  },
  ...
}