Hi! Does calling `update` on `MessageDigest` like ...

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[iex]

Hi! Does calling update on MessageDigest like this append or overwrite the data?

val digest = MessageDigest.getInstance("SHA-256")
digest.update("foo".toByteArray())
digest.update("bar".toByteArray())

I see in the source that update calls engineUpdate(input, 0, input.length);, which:

/**
     * Updates the digest using the specified array of bytes,
     * starting at the specified offset.
     *

This makes me thing that it overwrites the data, but the first snippet seems to work, so I'm confused