The original ChaCha20-Poly1305 construction can safely encrypt a pratically
unlimited number of messages with the same key, without any practical limit
to the size of a message (up to ~ 2^64 bytes).
Key | Key for symmetric authenticated encryption with additional data.
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Nonce | Nonce for symmetric authenticated encryption with additional data.
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Tag | Authentication Tag for symmetric authenticated encryption with additional data in
detached mode.
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gen_key | gen_key() randomly generates a secret key
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gen_nonce | gen_nonce() randomly generates a nonce
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open | open() verifies and decrypts a ciphertext c together with optional plaintext data ad
using a secret key k and a nonce n .
It returns a plaintext Ok(m) .
If the ciphertext fails verification, open() returns Err(()) .
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open_detached | open_detached() verifies and decrypts a ciphertext c toghether with optional plaintext data
ad and and authentication tag tag , using a secret key k and a nonce n .
c is decrypted in place, so if this function is successful it will contain the plaintext.
If the ciphertext fails verification, open_detached() returns Err(()) ,
and the ciphertext is not modified.
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seal | seal() encrypts and authenticates a message m together with optional plaintext data ad
using a secret key k and a nonce n . It returns a ciphertext c .
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seal_detached | seal_detached() encrypts and authenticates a message m together with optional plaintext data
ad using a secret key k and a nonce n .
m is encrypted in place, so after this function returns it will contain the ciphertext.
The detached authentication tag is returned by value.
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