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Authored by Vgutierrez on Nov 9 2022, 10:18 AM.

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	F35729797: raw-paste-data.txt
	Nov 9 2022, 10:18 AM

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	#!/usr/bin/python3.9
	import datetime
	# requires python3-nacl
	import nacl.encoding
	from nacl.hash import blake2b, siphash24, SIPHASH_KEYBYTES

	master_key = bytes.fromhex('e7e1ce2f97d3b8c6a83096ff5a68566549fa5de00731e001b1e623865060a725ed99c68790a3a8e09e3f631bc5fc704bedb4b6604aa8d06d5609147b34d6dc4e')
	subkey_id = str(datetime.date.today()).encode()
	context = b'diffpriv'

	# from https://libsodium.gitbook.io/doc/key_derivation
	# BLAKE2B-subkeylen(key=key, message={}, salt=subkey_id \|\| {0}, personal=ctx \|\| {0})
	derived = blake2b(b'', key=master_key, salt=subkey_id, person=context, encoder=nacl.encoding.RawEncoder)

	key = derived[:SIPHASH_KEYBYTES]
	print(f"[*] key to be used with SipHash24: {key.hex()}")

	msg = b'message to be hashed'
	h = siphash24(msg, key)
	print(f"[*] siphash24({msg}, {key.hex()}) = {h.hex()}")

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