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use crate::errors::Error;
use crate::version::private::Version;
use alloc::vec::Vec;
use core::fmt::Debug;
use core::marker::PhantomData;
/// A type `T` that can be generated for a given version `V`.
pub trait Generate<T, V: Version> {
/// Generate `T`.
fn generate() -> Result<T, Error>;
}
#[derive(Clone)]
/// A symmetric key used for `.local` tokens, given a version `V`.
pub struct SymmetricKey<V> {
pub(crate) bytes: Vec<u8>,
pub(crate) phantom: PhantomData<V>,
}
impl<V: Version> SymmetricKey<V> {
/// Create a `SymmetricKey` from `bytes`.
pub fn from(bytes: &[u8]) -> Result<Self, Error> {
V::validate_local_key(bytes)?;
Ok(Self {
bytes: bytes.to_vec(),
phantom: PhantomData,
})
}
/// Return this as a byte-slice.
pub fn as_bytes(&self) -> &[u8] {
self.bytes.as_slice()
}
}
impl<V> Drop for SymmetricKey<V> {
fn drop(&mut self) {
use zeroize::Zeroize;
self.bytes.iter_mut().zeroize();
}
}
impl<V> Debug for SymmetricKey<V> {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
write!(f, "SymmetricKey {{***OMITTED***}}")
}
}
impl<V: Version> PartialEq<SymmetricKey<V>> for SymmetricKey<V> {
fn eq(&self, other: &SymmetricKey<V>) -> bool {
use subtle::ConstantTimeEq;
self.as_bytes().ct_eq(other.as_bytes()).into()
}
}
#[derive(Clone)]
/// An asymmetric secret key used for `.public` tokens, given a version `V`.
///
/// In case of Ed25519, which is used in V2 and V4, this is the seed concatenated with the public key.
pub struct AsymmetricSecretKey<V> {
pub(crate) bytes: Vec<u8>,
pub(crate) phantom: PhantomData<V>,
}
impl<V: Version> AsymmetricSecretKey<V> {
/// Create a `AsymmetricSecretKey` from `bytes`.
///
/// __PANIC__: If the version is V2 or V4, a panic will occur if an all-zero
/// secret seed is used.
pub fn from(bytes: &[u8]) -> Result<Self, Error> {
V::validate_secret_key(bytes)?;
Ok(Self {
bytes: bytes.to_vec(),
phantom: PhantomData,
})
}
/// Return this as a byte-slice.
pub fn as_bytes(&self) -> &[u8] {
self.bytes.as_slice()
}
}
impl<V> Drop for AsymmetricSecretKey<V> {
fn drop(&mut self) {
use zeroize::Zeroize;
self.bytes.iter_mut().zeroize();
}
}
impl<V> Debug for AsymmetricSecretKey<V> {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
write!(f, "AsymmetricSecretKey {{***OMITTED***}}")
}
}
impl<V: Version> PartialEq<AsymmetricSecretKey<V>> for AsymmetricSecretKey<V> {
fn eq(&self, other: &AsymmetricSecretKey<V>) -> bool {
use subtle::ConstantTimeEq;
self.as_bytes().ct_eq(other.as_bytes()).into()
}
}
#[derive(Debug, Clone)]
/// An asymmetric public key used for `.public` tokens, given a version `V`.
pub struct AsymmetricPublicKey<V> {
pub(crate) bytes: Vec<u8>,
pub(crate) phantom: PhantomData<V>,
}
impl<V: Version> AsymmetricPublicKey<V> {
/// Create a `AsymmetricPublicKey` from `bytes`.
pub fn from(bytes: &[u8]) -> Result<Self, Error> {
V::validate_public_key(bytes)?;
Ok(Self {
bytes: bytes.to_vec(),
phantom: PhantomData,
})
}
/// Return this as a byte-slice.
pub fn as_bytes(&self) -> &[u8] {
self.bytes.as_slice()
}
}
impl<V: Version> PartialEq<AsymmetricPublicKey<V>> for AsymmetricPublicKey<V> {
fn eq(&self, other: &AsymmetricPublicKey<V>) -> bool {
use subtle::ConstantTimeEq;
self.as_bytes().ct_eq(other.as_bytes()).into()
}
}
#[derive(Debug, Clone)]
/// A keypair of an [`AsymmetricSecretKey`] and its corresponding [`AsymmetricPublicKey`].
pub struct AsymmetricKeyPair<V> {
/// The [`AsymmetricSecretKey`].
pub public: AsymmetricPublicKey<V>,
/// The [`AsymmetricPublicKey`].
pub secret: AsymmetricSecretKey<V>,
}
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