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VRF refactory (#13889)

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* First iteration to encapsulate schnorrkel and merlin usage

* Remove schnorkel direct dependency from BABE pallet

* Remove schnorrkel direct dependency from BABE client

* Trivial renaming for VrfTranscript data and value

* Better errors

* Expose a function to get a schnorrkel friendly transcript

* Keep the vrf signature stuff together (preventing some clones around)

* Fix tests

* Remove vrf agnostic transcript and define it as an associated type for VrfSigner and VrfVerifier

* Fix babe pallet mock

* Inner types are required to be public for polkadot

* Update client/consensus/babe/src/verification.rs

Co-authored-by: Koute <koute@users.noreply.github.com>

* Nit

* Remove Deref implementations

* make_bytes as a method

* Trigger CI

---------

Co-authored-by: Koute <koute@users.noreply.github.com>
This commit is contained in:
Davide Galassi
2023-04-19 11:11:47 +02:00
committed by GitHub
parent d9ad6feac0
commit bb394e08ac
28 changed files with 473 additions and 717 deletions
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substrate/primitives/consensus/babe/src/lib.rs
+18 -30
View File
@@ -23,22 +23,17 @@
pub mod digests;
pub mod inherents;
pub use merlin::Transcript;
pub use sp_consensus_vrf::schnorrkel::{
Randomness, RANDOMNESS_LENGTH, VRF_OUTPUT_LENGTH, VRF_PROOF_LENGTH,
};
use codec::{Decode, Encode, MaxEncodedLen};
use scale_info::TypeInfo;
#[cfg(feature = "std")]
use serde::{Deserialize, Serialize};
#[cfg(feature = "std")]
use sp_keystore::vrf::{VRFTranscriptData, VRFTranscriptValue};
use sp_runtime::{traits::Header, ConsensusEngineId, RuntimeDebug};
use sp_std::vec::Vec;
use crate::digests::{NextConfigDescriptor, NextEpochDescriptor};
pub use sp_core::sr25519::vrf::{VrfOutput, VrfProof, VrfSignature, VrfTranscript};
/// Key type for BABE module.
pub const KEY_TYPE: sp_core::crypto::KeyTypeId = sp_application_crypto::key_types::BABE;
@@ -47,11 +42,14 @@ mod app {
app_crypto!(sr25519, BABE);
}
/// The prefix used by BABE for its VRF keys.
pub const BABE_VRF_PREFIX: &[u8] = b"substrate-babe-vrf";
/// VRF context used for per-slot randomness generation.
pub const RANDOMNESS_VRF_CONTEXT: &[u8] = b"BabeVRFInOutContext";
/// BABE VRFInOut context.
pub static BABE_VRF_INOUT_CONTEXT: &[u8] = b"BabeVRFInOutContext";
/// VRF output length for per-slot randomness.
pub const RANDOMNESS_LENGTH: usize = 32;
/// Randomness type required by BABE operations.
pub type Randomness = [u8; RANDOMNESS_LENGTH];
/// A Babe authority keypair. Necessarily equivalent to the schnorrkel public key used in
/// the main Babe module. If that ever changes, then this must, too.
@@ -96,26 +94,16 @@ pub type BabeAuthorityWeight = u64;
/// of 0 (regardless of whether they are plain or vrf secondary blocks).
pub type BabeBlockWeight = u32;
/// Make a VRF transcript from given randomness, slot number and epoch.
pub fn make_transcript(randomness: &Randomness, slot: Slot, epoch: u64) -> Transcript {
let mut transcript = Transcript::new(&BABE_ENGINE_ID);
transcript.append_u64(b"slot number", *slot);
transcript.append_u64(b"current epoch", epoch);
transcript.append_message(b"chain randomness", &randomness[..]);
transcript
}
/// Make a VRF transcript data container
#[cfg(feature = "std")]
pub fn make_transcript_data(randomness: &Randomness, slot: Slot, epoch: u64) -> VRFTranscriptData {
VRFTranscriptData {
label: &BABE_ENGINE_ID,
items: vec![
("slot number", VRFTranscriptValue::U64(*slot)),
("current epoch", VRFTranscriptValue::U64(epoch)),
("chain randomness", VRFTranscriptValue::Bytes(randomness.to_vec())),
pub fn make_transcript(randomness: &Randomness, slot: Slot, epoch: u64) -> VrfTranscript {
VrfTranscript::new(
&BABE_ENGINE_ID,
&[
(b"slot number", &slot.to_le_bytes()),
(b"current epoch", &epoch.to_le_bytes()),
(b"chain randomness", randomness),
],
}
)
}
/// An consensus log item for BABE.
@@ -355,7 +343,7 @@ pub struct Epoch {
/// The authorities and their weights.
pub authorities: Vec<(AuthorityId, BabeAuthorityWeight)>,
/// Randomness for this epoch.
pub randomness: [u8; VRF_OUTPUT_LENGTH],
pub randomness: Randomness,
/// Configuration of the epoch.
pub config: BabeEpochConfiguration,
}