implemented proof of concept for encrypting and decrypting uid2 v4 format #1936
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Test generating v4 format:
generating IV
encrypting first level hash
constructing v4 UID with metadata + key id + IV + encrypted first level hash + checksum
assert UID is length 33
assert UID can be extracted into the components metadata + key id + IV + encrypted first level hash + checksum
assert encrypted hash can be decrypted into first level hash
assert UID can be reconstructed