Creates and returns a Verify object that uses the given algorithm. Use getHashes to obtain an array of names of the available signing algorithms. Optional options argument controls thestream.Writable behavior.

In some cases, a Verify instance can be created using the name of a signature algorithm, such as 'RSA-SHA256', instead of a digest algorithm. This will use the corresponding digest algorithm. This does not work for all signature algorithms, such as 'ecdsa-with-SHA256', so it is best to always use digest algorithm names.