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Call this before doing encryption, give current, yet unused, integer IV as <nonce>
and the amount of subsequent (counter-like) IVs needed as <nonce_space_needed>.
Return value is the IV (counter) integer you shall use for encryption.
Note: this method may return the <nonce> you gave, if a reservation for it exists or
can be established, so make sure you give a unused nonce.
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