Struct ring::hkdf::Okm

pub struct Okm<'a, L: KeyType> {
    prk: &'a Prk,
    info: &'a [&'a [u8]],
    len: L,
    len_cached: usize,
}

An HKDF OKM (Output Keying Material)

Intentionally not Clone or Copy as an OKM is generally only safe to use once.

Fields

prk: &'a Prk

info: &'a [&'a [u8]]

len: L

len_cached: usize

Implementations

impl<L: KeyType> Okm<'_, L>

pub fn len(&self) -> &L

The OkmLength given to Prk::expand().

pub fn fill(self, out: &mut [u8]) -> Result<(), Unspecified>

Fills out with the output of the HKDF-Expand operation for the given inputs.

Fails if (and only if) the requested output length is larger than 255 times the size of the digest algorithm’s output. (This is the limit imposed by the HKDF specification due to the way HKDF’s counter is constructed.)

Trait Implementations

impl<'a, L: Debug + KeyType> Debug for Okm<'a, L>

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

Formats the value using the given formatter.

impl From<Okm<'_, &'static Algorithm>> for HeaderProtectionKey

fn from(okm: Okm<'_, &'static Algorithm>) -> Self

Converts to this type from the input type.

impl From<Okm<'_, &'static Algorithm>> for UnboundKey

fn from(okm: Okm<'_, &'static Algorithm>) -> Self

Converts to this type from the input type.

impl From<Okm<'_, Algorithm>> for Key

fn from(okm: Okm<'_, Algorithm>) -> Self

Converts to this type from the input type.

impl From<Okm<'_, Algorithm>> for Prk

fn from(okm: Okm<'_, Algorithm>) -> Self

Converts to this type from the input type.

impl From<Okm<'_, Algorithm>> for Salt

fn from(okm: Okm<'_, Algorithm>) -> Self

Converts to this type from the input type.