Struct opaque_ke::key_exchange::group::x25519::X25519

pub struct X25519;

Implementation for X25519.

Trait Implementations

impl KeGroup for X25519

The implementation of such a subgroup for Ristretto

type Pk = MontgomeryPoint

Public key

type PkLen = UInt<UInt<UInt<UInt<UInt<UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>

Length of the public key

type Sk = Scalar

Secret key

type SkLen = UInt<UInt<UInt<UInt<UInt<UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>

Length of the secret key

fn serialize_pk(pk: Self::Pk) -> GenericArray<u8, Self::PkLen>

Serializes self

fn deserialize_pk(bytes: &[u8]) -> Result<Self::Pk, InternalError>

Return a public key from its fixed-length bytes representation

fn random_sk<R: RngCore + CryptoRng>(rng: &mut R) -> Self::Sk

Generate a random secret key

fn hash_to_scalar<'a, H>(
    input: &[&[u8]],
    dst: &[u8]
) -> Result<Self::Sk, InternalError>where
    H: Digest + BlockSizeUser,
    H::OutputSize: IsLess<U256> + IsLessOrEqual<H::BlockSize>,

Hashes a slice of pseudo-random bytes to a scalar

fn is_zero_scalar(scalar: Self::Sk) -> Choice

Returns true if the scalar is zero.

fn public_key(sk: Self::Sk) -> Self::Pk

Return a public key from its secret key

fn diffie_hellman(pk: Self::Pk, sk: Self::Sk) -> GenericArray<u8, Self::PkLen>

Diffie-Hellman key exchange

fn serialize_sk(sk: Self::Sk) -> GenericArray<u8, Self::SkLen>

Serializes self

fn deserialize_sk(bytes: &[u8]) -> Result<Self::Sk, InternalError>

Return a public key from its fixed-length bytes representation

fn derive_auth_keypair<CS: CipherSuite>(
    seed: &[u8],
    info: &[u8]
) -> Result<Self::Sk, InternalError>where
    <CS::Hash as OutputSizeUser>::OutputSize: IsLess<U256> + IsLessOrEqual<<CS::Hash as BlockSizeUser>::BlockSize>,

Corresponds to the DeriveAuthKeyPair() function defined in https://www.ietf.org/archive/id/draft-irtf-cfrg-opaque-08.html#section-6.4.2