Enum Error 

pub enum Error {
    InsufficientEntropy,
    RequestTooLarge,
    AdditionalInputTooLong,
    PersonalizationTooLong,
    ReseedRequired,
    InvalidLength,
}

Errors returned by the DRBG mechanisms (SP 800-90A §9).

Each mechanism re-exports this single enum; the variants map onto the ERROR_FLAG / length-check conditions of §10 and the reseed-count exhaustion of §9.3.3.

Variants

InsufficientEntropy

The instantiate/reseed entropy input is shorter than the mechanism’s minimum (security_strength bits, SP 800-90A §8.6.3 and the tables of §10). Also raised, for CTR_DRBG without a derivation function, when the entropy input length is not exactly seedlen (§10.2.1.3.1).

RequestTooLarge

A single generate request asked for more than max_number_of_bits_per_request (SP 800-90A §10, tables 2/3: 2^19 bits = 65 536 octets).

AdditionalInputTooLong

The additional_input supplied to generate/reseed exceeds max_additional_input_length (2^35 bits; enforced here as a byte bound to keep the length fields in range).

PersonalizationTooLong

The personalization string exceeds max_personalization_string_length (SP 800-90A §10, 2^35 bits).

ReseedRequired

The reseed counter reached reseed_interval: a reseed is required before the next generate (SP 800-90A §9.3.3, step 1 → status “Reseed required”). The caller must call reseed.

InvalidLength

A CTR_DRBG no-df key length that is not one of the AES key sizes, or a personalization/additional-input length that does not match seedlen in no-df mode (SP 800-90A §10.2.1.3.1 / §10.2.1.5.1).

Trait Implementations

impl Clone for Error

fn clone(&self) -> Error

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Error

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Error

fn eq(&self, other: &Error) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Error

impl Eq for Error

impl StructuralPartialEq for Error