crypto.constants = undefined

When using crypto-browserify or just browserify to require crypto i want to use the following:

```js
const encryptedData = crypto.publicEncrypt({
key: `some public key`,
padding: crypto.constants.RSA_PKCS1_OAEP_PADDING,
oaepHash: "sha256",
},
Buffer.from(password) // We convert the data string to a buffer using `Buffer.from` so we can manipulate the data using publicEncrypt
)
```
But `crypto.constants = undefined` so I'm not sure what to do?

This issue has also been mentioned on browserify [here](https://github.com/browserify/browserify/issues/1964) and was requested to be moved to this repo as well.