mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-06-30 23:37:24 +00:00
André Silva
1f023deab8
This will make more sense after https://github.com/paritytech/polkadot-sdk/pull/2524 since the schnorrkel type for VRF outputs is also renamed in the latest version. Can be reviewed independently though. Can be merged after https://github.com/paritytech/polkadot-sdk/pull/1577 so that there is less pain for @davxy. --------- Co-authored-by: Bastian Köcher <git@kchr.de>
111 lines
3.9 KiB
Rust
111 lines
3.9 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Utilities related to VRF input, pre-output and signatures.
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use crate::{Randomness, TicketBody, TicketId};
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use scale_codec::Encode;
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use sp_consensus_slots::Slot;
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use sp_std::vec::Vec;
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pub use sp_core::bandersnatch::{
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ring_vrf::{RingProver, RingVerifier, RingVerifierData, RingVrfSignature},
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vrf::{VrfInput, VrfPreOutput, VrfSignData, VrfSignature},
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};
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/// Ring VRF domain size for Sassafras consensus.
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pub const RING_VRF_DOMAIN_SIZE: u32 = 2048;
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/// Bandersnatch VRF [`RingContext`] specialization for Sassafras using [`RING_VRF_DOMAIN_SIZE`].
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pub type RingContext = sp_core::bandersnatch::ring_vrf::RingContext<RING_VRF_DOMAIN_SIZE>;
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fn vrf_input_from_data(
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domain: &[u8],
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data: impl IntoIterator<Item = impl AsRef<[u8]>>,
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) -> VrfInput {
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let buf = data.into_iter().fold(Vec::new(), |mut buf, item| {
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let bytes = item.as_ref();
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buf.extend_from_slice(bytes);
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let len = u8::try_from(bytes.len()).expect("private function with well known inputs; qed");
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buf.push(len);
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buf
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});
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VrfInput::new(domain, buf)
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}
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/// VRF input to claim slot ownership during block production.
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pub fn slot_claim_input(randomness: &Randomness, slot: Slot, epoch: u64) -> VrfInput {
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vrf_input_from_data(
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b"sassafras-claim-v1.0",
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[randomness.as_slice(), &slot.to_le_bytes(), &epoch.to_le_bytes()],
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)
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}
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/// Signing-data to claim slot ownership during block production.
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pub fn slot_claim_sign_data(randomness: &Randomness, slot: Slot, epoch: u64) -> VrfSignData {
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let input = slot_claim_input(randomness, slot, epoch);
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VrfSignData::new_unchecked(
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b"sassafras-slot-claim-transcript-v1.0",
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Option::<&[u8]>::None,
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Some(input),
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)
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}
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/// VRF input to generate the ticket id.
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pub fn ticket_id_input(randomness: &Randomness, attempt: u32, epoch: u64) -> VrfInput {
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vrf_input_from_data(
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b"sassafras-ticket-v1.0",
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[randomness.as_slice(), &attempt.to_le_bytes(), &epoch.to_le_bytes()],
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)
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}
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/// VRF input to generate the revealed key.
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pub fn revealed_key_input(randomness: &Randomness, attempt: u32, epoch: u64) -> VrfInput {
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vrf_input_from_data(
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b"sassafras-revealed-v1.0",
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[randomness.as_slice(), &attempt.to_le_bytes(), &epoch.to_le_bytes()],
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)
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}
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/// Data to be signed via ring-vrf.
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pub fn ticket_body_sign_data(ticket_body: &TicketBody, ticket_id_input: VrfInput) -> VrfSignData {
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VrfSignData::new_unchecked(
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b"sassafras-ticket-body-transcript-v1.0",
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Some(ticket_body.encode().as_slice()),
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Some(ticket_id_input),
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)
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}
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/// Make ticket-id from the given VRF input and pre-output.
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///
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/// Input should have been obtained via [`ticket_id_input`].
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/// Pre-output should have been obtained from the input directly using the vrf
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/// secret key or from the vrf signature pre-outputs.
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pub fn make_ticket_id(input: &VrfInput, pre_output: &VrfPreOutput) -> TicketId {
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let bytes = pre_output.make_bytes::<16>(b"ticket-id", input);
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u128::from_le_bytes(bytes)
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}
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/// Make revealed key seed from a given VRF input and pre-ouput.
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///
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/// Input should have been obtained via [`revealed_key_input`].
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/// Pre-output should have been obtained from the input directly using the vrf
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/// secret key or from the vrf signature pre-outputs.
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pub fn make_revealed_key_seed(input: &VrfInput, pre_output: &VrfPreOutput) -> [u8; 32] {
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pre_output.make_bytes::<32>(b"revealed-seed", input)
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}
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