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Add notes about safe uses of twox (#6082)

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* Add notes about safe uses of twox

* Update frame/grandpa/src/lib.rs

Co-authored-by: Nikolay Volf <nikvolf@gmail.com>

* Update frame/elections/src/lib.rs

* Apply suggestions from code review

Co-authored-by: Gavin Wood <gavin@parity.io>
Co-authored-by: Nikolay Volf <nikvolf@gmail.com>
This commit is contained in:
Demi Obenour
2020-05-21 11:57:29 +00:00
committed by GitHub
parent a90c4232e3
commit ee6633e038
9 changed files with 41 additions and 0 deletions
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substrate/frame/elections/src/lib.rs
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@@ -237,16 +237,25 @@ decl_storage! {
// bit-wise manner. In order to get a human-readable representation (`Vec<bool>`), use
// [`all_approvals_of`]. Furthermore, each vector of scalars is chunked with the cap of
// `APPROVAL_SET_SIZE`.
///
/// TWOX-NOTE: SAFE as `AccountId` is a crypto hash and `SetIndex` is not
/// attacker-controlled.
pub ApprovalsOf get(fn approvals_of):
map hasher(twox_64_concat) (T::AccountId, SetIndex) => Vec<ApprovalFlag>;
/// The vote index and list slot that the candidate `who` was registered or `None` if they
/// are not currently registered.
///
/// TWOX-NOTE: SAFE as `AccountId` is a crypto hash.
pub RegisterInfoOf get(fn candidate_reg_info):
map hasher(twox_64_concat) T::AccountId => Option<(VoteIndex, u32)>;
/// Basic information about a voter.
///
/// TWOX-NOTE: SAFE as `AccountId` is a crypto hash.
pub VoterInfoOf get(fn voter_info):
map hasher(twox_64_concat) T::AccountId => Option<VoterInfo<BalanceOf<T>>>;
/// The present voter list (chunked and capped at [`VOTER_SET_SIZE`]).
///
/// TWOX-NOTE: OKAY ― `SetIndex` is not user-controlled data.
pub Voters get(fn voters): map hasher(twox_64_concat) SetIndex => Vec<Option<T::AccountId>>;
/// the next free set to store a voter in. This will keep growing.
pub NextVoterSet get(fn next_nonfull_voter_set): SetIndex = 0;