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rococo: use insecure parent hash randomness (#2701)

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This commit is contained in:
André Silva
2021-03-25 09:49:40 +00:00
committed by GitHub
parent bfbb078525
commit 7149f764e4
1 changed files with 10 additions and 14 deletions
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polkadot/runtime/rococo/src/lib.rs
+10 -14
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@@ -612,21 +612,17 @@ impl paras_registrar::Config for Runtime {
type WeightInfo = paras_registrar::TestWeightInfo;
}
// A wrapper around `babe::CurrentBlockRandomness` that does not return `Option<Random>`.
pub struct CurrentBlockRandomness;
/// An insecure randomness beacon that uses the parent block hash as random material.
///
/// THIS SHOULD ONLY BE USED FOR TESTING PURPOSES.
pub struct ParentHashRandomness;
impl Randomness<Hash, BlockNumber> for CurrentBlockRandomness {
impl Randomness<Hash, BlockNumber> for ParentHashRandomness {
fn random(subject: &[u8]) -> (Hash, BlockNumber) {
let (randomness, block_number) =
pallet_babe::CurrentBlockRandomness::<Runtime>::random(subject);
let randomness = randomness.expect(
"only returns None when secondary VRF slots are not enabled; \
secondary VRF slots are enbaled for rococo runtime; \
qed.",
);
(randomness, block_number)
(
(System::parent_hash(), subject).using_encoded(sp_io::hashing::blake2_256).into(),
System::block_number(),
)
}
}
@@ -640,7 +636,7 @@ impl auctions::Config for Runtime {
type Leaser = Slots;
type EndingPeriod = EndingPeriod;
type SampleLength = SampleLength;
type Randomness = CurrentBlockRandomness;
type Randomness = ParentHashRandomness;
type InitiateOrigin = EnsureRoot<AccountId>;
type WeightInfo = auctions::TestWeightInfo;
}