86 lines
2.6 KiB
Rust
86 lines
2.6 KiB
Rust
// -*- mode: rust; -*-
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//
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// This file is part of redjubjub.
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// Copyright (c) 2019-2021 Zcash Foundation
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// See LICENSE for licensing information.
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//
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// Authors:
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// - Deirdre Connolly <deirdre@zfnd.org>
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// - Henry de Valence <hdevalence@hdevalence.ca>
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use std::convert::{TryFrom, TryInto};
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use crate::{Error, Randomizer, SigType, Signature, SpendAuth, VerificationKey};
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use rand_core::{CryptoRng, RngCore};
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/// A RedJubJub signing key.
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#[derive(Copy, Clone, Debug)]
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#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
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#[cfg_attr(feature = "serde", serde(try_from = "SerdeHelper"))]
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#[cfg_attr(feature = "serde", serde(into = "SerdeHelper"))]
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#[cfg_attr(feature = "serde", serde(bound = "T: SigType"))]
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pub struct SigningKey<T: SigType>(reddsa::SigningKey<T::RedDSASigType>);
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impl<'a, T: SigType> From<&'a SigningKey<T>> for VerificationKey<T> {
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fn from(sk: &'a SigningKey<T>) -> VerificationKey<T> {
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let reddsa_vk = reddsa::VerificationKey::<_>::from(&sk.0);
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VerificationKey(reddsa_vk)
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}
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}
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impl<T: SigType> From<SigningKey<T>> for [u8; 32] {
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fn from(sk: SigningKey<T>) -> [u8; 32] {
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sk.0.into()
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}
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}
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impl<T: SigType> TryFrom<[u8; 32]> for SigningKey<T> {
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type Error = Error;
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fn try_from(bytes: [u8; 32]) -> Result<Self, Self::Error> {
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let reddsa_sk = reddsa::SigningKey::<_>::try_from(bytes)?;
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Ok(SigningKey(reddsa_sk))
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}
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}
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#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
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struct SerdeHelper([u8; 32]);
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impl<T: SigType> TryFrom<SerdeHelper> for SigningKey<T> {
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type Error = Error;
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fn try_from(helper: SerdeHelper) -> Result<Self, Self::Error> {
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helper.0.try_into()
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}
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}
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impl<T: SigType> From<SigningKey<T>> for SerdeHelper {
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fn from(sk: SigningKey<T>) -> Self {
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Self(sk.into())
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}
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}
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impl SigningKey<SpendAuth> {
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/// Randomize this public key with the given `randomizer`.
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pub fn randomize(&self, randomizer: &Randomizer) -> SigningKey<SpendAuth> {
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let reddsa_sk = self.0.randomize(randomizer);
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SigningKey(reddsa_sk)
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}
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}
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impl<T: SigType> SigningKey<T> {
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/// Generate a new signing key.
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pub fn new<R: RngCore + CryptoRng>(rng: R) -> SigningKey<T> {
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let reddsa_sk = reddsa::SigningKey::new(rng);
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SigningKey(reddsa_sk)
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}
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/// Create a signature of type `T` on `msg` using this `SigningKey`.
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// Similar to signature::Signer but without boxed errors.
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pub fn sign<R: RngCore + CryptoRng>(&self, rng: R, msg: &[u8]) -> Signature<T> {
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let reddsa_sig = self.0.sign(rng, msg);
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Signature(reddsa_sig)
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}
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}
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