Module sodiumoxide::crypto::aead::chacha20poly1305_ietf[−][src]

Expand description

The IETF variant of the ChaCha20-Poly1305 construction can safely encrypt a practically unlimited number of messages, but individual messages cannot exceed 64*(2^32)-64 bytes (approximatively 256 GB).

Structs

Key	`Key` for symmetric authenticated encryption with additional data.
Nonce	`Nonce` for symmetric authenticated encryption with additional data.
Tag	Authentication `Tag` for symmetric authenticated encryption with additional data in detached mode.

Constants

KEYBYTES	Number of bytes in a `Key`.
NONCEBYTES	Number of bytes in a `Nonce`.
TAGBYTES	Number of bytes in an authentication `Tag`.

Functions

gen_key	`gen_key()` randomly generates a secret key
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(())`.
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.
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`.
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.