use alloc::vec::Vec;
use crate::{Ciphersuite, FieldError};
use crate::{Element, Error, Field, Group};
#[derive(Clone, Copy, PartialEq, Eq)]
#[cfg_attr(feature = "internals", visibility::make(pub))]
#[cfg_attr(docsrs, doc(cfg(feature = "internals")))]
pub(crate) struct SerializableScalar<C: Ciphersuite>(
pub <<<C as Ciphersuite>::Group as Group>::Field as Field>::Scalar,
);
impl<C> SerializableScalar<C>
where
C: Ciphersuite,
{
pub fn serialize(&self) -> Vec<u8> {
<<C::Group as Group>::Field>::serialize(&self.0)
.as_ref()
.to_vec()
}
pub fn deserialize(bytes: &[u8]) -> Result<Self, Error<C>> {
let serialized: <<C::Group as Group>::Field as Field>::Serialization = bytes
.to_vec()
.try_into()
.map_err(|_| FieldError::MalformedScalar)?;
let scalar = <<C::Group as Group>::Field>::deserialize(&serialized)?;
Ok(Self(scalar))
}
}
#[cfg(feature = "serde")]
impl<C> serde::Serialize for SerializableScalar<C>
where
C: Ciphersuite,
{
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
let serialized = <<C as Ciphersuite>::Group as Group>::Field::serialize(&self.0);
serdect::array::serialize_hex_lower_or_bin(&serialized.as_ref(), serializer)
}
}
#[cfg(feature = "serde")]
impl<'de, C> serde::Deserialize<'de> for SerializableScalar<C>
where
C: Ciphersuite,
{
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
let zero = <<C::Group as Group>::Field as Field>::zero();
let len = <<C::Group as Group>::Field as Field>::serialize(&zero)
.as_ref()
.len();
let mut bytes = vec![0u8; len];
serdect::array::deserialize_hex_or_bin(&mut bytes[..], deserializer)?;
let array = bytes
.try_into()
.map_err(|_| serde::de::Error::custom("invalid byte length"))?;
<<C as Ciphersuite>::Group as Group>::Field::deserialize(&array)
.map(|scalar| Self(scalar))
.map_err(serde::de::Error::custom)
}
}
#[derive(Clone, Copy, PartialEq, Eq)]
pub(crate) struct SerializableElement<C: Ciphersuite>(pub(crate) Element<C>);
impl<C> SerializableElement<C>
where
C: Ciphersuite,
{
pub fn serialize(&self) -> Result<Vec<u8>, Error<C>> {
Ok(<C::Group as Group>::serialize(&self.0)?.as_ref().to_vec())
}
pub fn deserialize(bytes: &[u8]) -> Result<Self, Error<C>> {
let serialized: <C::Group as Group>::Serialization = bytes
.to_vec()
.try_into()
.map_err(|_| FieldError::MalformedScalar)?;
let scalar = <C::Group as Group>::deserialize(&serialized)?;
Ok(Self(scalar))
}
}
#[cfg(feature = "serde")]
impl<C> serde::Serialize for SerializableElement<C>
where
C: Ciphersuite,
{
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
let serialized =
<C::Group as Group>::serialize(&self.0).map_err(serde::ser::Error::custom)?;
serdect::array::serialize_hex_lower_or_bin(&serialized.as_ref(), serializer)
}
}
#[cfg(feature = "serde")]
impl<'de, C> serde::Deserialize<'de> for SerializableElement<C>
where
C: Ciphersuite,
{
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
let generator = <C::Group>::generator();
let len = <C::Group>::serialize(&generator)
.expect("serializing the generator always works")
.as_ref()
.len();
let mut bytes = vec![0u8; len];
serdect::array::deserialize_hex_or_bin(&mut bytes[..], deserializer)?;
let array = bytes
.try_into()
.map_err(|_| serde::de::Error::custom("invalid byte length"))?;
<C::Group as Group>::deserialize(&array)
.map(|element| Self(element))
.map_err(serde::de::Error::custom)
}
}
#[cfg(feature = "serde")]
const fn short_id<C>() -> [u8; 4]
where
C: Ciphersuite,
{
const_crc32::crc32(C::ID.as_bytes()).to_be_bytes()
}
#[cfg(feature = "serde")]
pub(crate) fn ciphersuite_serialize<S, C>(_: &(), s: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
C: Ciphersuite,
{
use serde::Serialize;
if s.is_human_readable() {
C::ID.serialize(s)
} else {
serde::Serialize::serialize(&short_id::<C>(), s)
}
}
#[cfg(feature = "serde")]
pub(crate) fn ciphersuite_deserialize<'de, D, C>(deserializer: D) -> Result<(), D::Error>
where
D: serde::Deserializer<'de>,
C: Ciphersuite,
{
if deserializer.is_human_readable() {
let s: alloc::string::String = serde::de::Deserialize::deserialize(deserializer)?;
if s != C::ID {
Err(serde::de::Error::custom("wrong ciphersuite"))
} else {
Ok(())
}
} else {
let buffer: [u8; 4] = serde::de::Deserialize::deserialize(deserializer)?;
if buffer != short_id::<C>() {
Err(serde::de::Error::custom("wrong ciphersuite"))
} else {
Ok(())
}
}
}
#[cfg(feature = "serde")]
pub(crate) fn version_deserialize<'de, D>(deserializer: D) -> Result<u8, D::Error>
where
D: serde::Deserializer<'de>,
{
let version: u8 = serde::de::Deserialize::deserialize(deserializer)?;
if version != 0 {
Err(serde::de::Error::custom(
"wrong format version, only 0 supported",
))
} else {
Ok(version)
}
}
#[cfg(feature = "serialization")]
pub(crate) trait Serialize<C: Ciphersuite> {
fn serialize(&self) -> Result<Vec<u8>, Error<C>>;
}
#[cfg(feature = "serialization")]
pub(crate) trait Deserialize<C: Ciphersuite> {
fn deserialize(bytes: &[u8]) -> Result<Self, Error<C>>
where
Self: core::marker::Sized;
}
#[cfg(feature = "serialization")]
impl<T: serde::Serialize, C: Ciphersuite> Serialize<C> for T {
fn serialize(&self) -> Result<Vec<u8>, Error<C>> {
postcard::to_allocvec(self).map_err(|_| Error::SerializationError)
}
}
#[cfg(feature = "serialization")]
impl<T: for<'de> serde::Deserialize<'de>, C: Ciphersuite> Deserialize<C> for T {
fn deserialize(bytes: &[u8]) -> Result<Self, Error<C>> {
postcard::from_bytes(bytes).map_err(|_| Error::DeserializationError)
}
}