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Add XChaCha20Poly1305 box #235

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This adds support for an XChaCha20Poly1305 sealed box.

It can either be used stand-alone, or it can be passed to the the SimpleBox initializer which accepts an existing box and used with SimpleBox. It does not change the default SimpleBox algorithm of Salsa20.


module RbNaCl
module SecretBoxes
# The XChaCha20Poly1305 class boxes and unboxes messages using the XChaCha20Poly1305 algorithm
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@tarcieri tarcieri Jul 22, 2024

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It would probably be good to note there are two different flavors of algorithm calling themselves XChaCha20Poly1305

  • crypto_secretbox / djb-style: this is effectively the crypto_secretbox function but with XChaCha20 swapped for XSalsa20, and what is being implemented here
  • draft-irtf-cfrg-xchacha: uses the IETF flavor of ChaCha20

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