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* Factor redundant code in std/crypto/chacha20 * Add support for XChaCha20, and the XChaCha20-Poly1305 construction. XChaCha20 is a 24-byte version of ChaCha20, is widely implemented and is on the standards track: https://tools.ietf.org/html/draft-irtf-cfrg-xchacha-03 * Add support for encryption/decryption with the authentication tag detached from the ciphertext * Add wrappers with an API similar to the Gimli AEAD type, so that we can use and benchmark AEADs with a common API.