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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>
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