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revert: remove unused contract for external nullifiers

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cedoor
2022-02-07 17:09:02 +01:00
parent 29e5970799
commit 413191ee39
1 changed files with 0 additions and 41 deletions
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contracts/base/SemaphoreNullifiers.sol
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//SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.4;
import {SNARK_SCALAR_FIELD} from "./SemaphoreConstants.sol";
import "../interfaces/ISemaphoreNullifiers.sol";
/// @title Semaphore nullifiers contract.
/// @dev The following code allows you to add or remove external nullifier to be used in proofs.
/// External nullifiers help to prevent double-signaling by the same user.
abstract contract SemaphoreNullifiers is ISemaphoreNullifiers {
/// @dev The external nullifier helps to prevent double-signaling by the same user.
mapping(uint256 => bool) internal externalNullifiers;
/// @dev Adds a new external nullifier.
/// @param externalNullifier: External Semaphore nullifier.
function _addExternalNullifier(uint256 externalNullifier) internal virtual {
require(externalNullifiers[externalNullifier], "SemaphoreNullifiers: the external nullifier already exists");
require(
externalNullifier < SNARK_SCALAR_FIELD,
"SemaphoreNullifiers: external nullifier must be < SNARK_SCALAR_FIELD"
);
externalNullifiers[externalNullifier] = true;
emit ExternalNullifierAdded(externalNullifier);
}
/// @dev Removes an existing external nullifier.
/// @param externalNullifier: External Semaphore nullifier.
function _removeExternalNullifier(uint256 externalNullifier) internal virtual {
require(!externalNullifiers[externalNullifier], "SemaphoreNullifiers: the external nullifier does not exists");
require(
externalNullifier < SNARK_SCALAR_FIELD,
"SemaphoreNullifiers: external nullifier must be < SNARK_SCALAR_FIELD"
);
externalNullifiers[externalNullifier] = false;
emit ExternalNullifierRemoved(externalNullifier);
}
}