Trait ring::aead::NonceSequence
source · [−]pub trait NonceSequence {
fn advance(&mut self) -> Result<Nonce, Unspecified>;
}Expand description
A sequences of unique nonces.
A given NonceSequence must never return the same Nonce twice from
advance().
A simple counter is a reasonable (but probably not ideal) NonceSequence.
Intentionally not Clone or Copy since cloning would allow duplication
of the sequence.
Required methods
fn advance(&mut self) -> Result<Nonce, Unspecified>
fn advance(&mut self) -> Result<Nonce, Unspecified>
Returns the next nonce in the sequence.
This may fail if “too many” nonces have been requested, where how many
is too many is up to the implementation of NonceSequence. An
implementation may that enforce a maximum number of records are
sent/received under a key this way. Once advance() fails, it must
fail for all subsequent calls.