An Nacl Crypto playgroud for nacl AEAD Encrytion and Decryption
crypto_secretbox is crypto_secretbox_xsalsa20poly1305, a particular combination of Salsa20 and Poly1305 specified. This function is conjectured to meet the standard notions of privacy and authenticity
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The crypto_secretbox function encrypts and authenticates a message m using a secret key k and a nonce n. The crypto_secretbox function returns the resulting ciphertext c. The function raises an exception if k.size() is not crypto_secretbox_KEYBYTES. The function also raises an exception if n.size() is not crypto_secretbox_NONCEBYTES
NaCl does not make any promises regarding the resistance of crypto_stream to "related-key attacks." It is the caller's responsibility to use proper key-derivation functions.
The crypto_secretbox function is designed to meet the standard notions of privacy and authenticity for a secret-key authenticated-encryption scheme using nonces