crypto Cipher/Decipher validation issues

This also affects Decipher methods.

Here's an example:

const { createCipheriv, randomBytes } = require('crypto');

const cipher = createCipheriv('aes-256-cbc', randomBytes(32), randomBytes(16));

cipher.update('test', 'utf-8', 'bad');

Gives an internal assertion:

Error [ERR_INTERNAL_ASSERTION]: Cannot change encoding
This is caused by either a bug in Node.js or incorrect usage of Node.js internals.
Please open an issue with this stack trace at https://github.com/nodejs/node/issues

final has the same issue:

const { createCipheriv, randomBytes } = require('crypto');

const cipher = createCipheriv('aes-256-cbc', randomBytes(32), randomBytes(16));

cipher.update('test', 'utf-8', 'utf-8');
cipher.final('bad');

Other issue:

const { createCipheriv, randomBytes } = require('crypto');

const cipher = createCipheriv('aes-256-cbc', randomBytes(32), randomBytes(16));

let result = cipher.update('test', 'bad', 'hex');
result += cipher.final('hex');
console.log(result);

Gives no error at all for the wrong input encoding.

@nodejs/crypto

Start by running the Cipher and Decipher examples in the issue and inspect the crypto Cipher/Decipher method paths they exercise. Compare the handling of invalid input and output encodings in update and final. Done means invalid encodings receive appropriate validation errors instead of an internal assertion or silent acceptance.