Pieter Wuille 0fee267792 crypto: add FSChaCha20, a rekeying wrapper around ChaCha20
This adds the FSChaCha20 stream cipher as specified in BIP324, a
wrapper around the ChaCha20 stream cipher (specified in RFC8439
section 2.4) which automatically rekeys every N messages, and
manages the nonces used for encryption.

Co-authored-by: dhruv <856960+dhruv@users.noreply.github.com>
2023-07-26 16:55:05 -04:00
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