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0xE3a4C2FE9f025405cA6F60f6E960B4558604A74C

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Contract Source Code Verified (Exact Match)

Contract Name:
Pairing

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
// Copyright 2017 Christian Reitwiessner
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// The following Pairing library is a modified version adapted to Semaphore.
//
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

library Pairing {
    error Semaphore__InvalidProof();

    // The prime q in the base field F_q for G1
    uint256 constant BASE_MODULUS = 21888242871839275222246405745257275088696311157297823662689037894645226208583;

    // The prime moludus of the scalar field of G1.
    uint256 constant SCALAR_MODULUS = 21888242871839275222246405745257275088548364400416034343698204186575808495617;

    struct G1Point {
        uint256 X;
        uint256 Y;
    }

    // Encoding of field elements is: X[0] * z + X[1]
    struct G2Point {
        uint256[2] X;
        uint256[2] Y;
    }

    /// @return the generator of G1
    function P1() public pure returns (G1Point memory) {
        return G1Point(1, 2);
    }

    /// @return the generator of G2
    function P2() public pure returns (G2Point memory) {
        return
            G2Point(
                [
                    11559732032986387107991004021392285783925812861821192530917403151452391805634,
                    10857046999023057135944570762232829481370756359578518086990519993285655852781
                ],
                [
                    4082367875863433681332203403145435568316851327593401208105741076214120093531,
                    8495653923123431417604973247489272438418190587263600148770280649306958101930
                ]
            );
    }

    /// @return r the negation of p, i.e. p.addition(p.negate()) should be zero.
    function negate(G1Point memory p) public pure returns (G1Point memory r) {
        if (p.X == 0 && p.Y == 0) {
            return G1Point(0, 0);
        }

        // Validate input or revert
        if (p.X >= BASE_MODULUS || p.Y >= BASE_MODULUS) {
            revert Semaphore__InvalidProof();
        }

        // We know p.Y > 0 and p.Y < BASE_MODULUS.
        return G1Point(p.X, BASE_MODULUS - p.Y);
    }

    /// @return r the sum of two points of G1
    function addition(G1Point memory p1, G1Point memory p2) public view returns (G1Point memory r) {
        // By EIP-196 all input is validated to be less than the BASE_MODULUS and form points
        // on the curve.
        uint256[4] memory input;

        input[0] = p1.X;
        input[1] = p1.Y;
        input[2] = p2.X;
        input[3] = p2.Y;

        bool success;

        // solium-disable-next-line security/no-inline-assembly
        assembly {
            success := staticcall(sub(gas(), 2000), 6, input, 0xc0, r, 0x60)
        }

        if (!success) {
            revert Semaphore__InvalidProof();
        }
    }

    /// @return r the product of a point on G1 and a scalar, i.e.
    /// p == p.scalar_mul(1) and p.addition(p) == p.scalar_mul(2) for all points p.
    function scalar_mul(G1Point memory p, uint256 s) public view returns (G1Point memory r) {
        // By EIP-196 the values p.X and p.Y are verified to less than the BASE_MODULUS and
        // form a valid point on the curve. But the scalar is not verified, so we do that explicitelly.
        if (s >= SCALAR_MODULUS) {
            revert Semaphore__InvalidProof();
        }

        uint256[3] memory input;

        input[0] = p.X;
        input[1] = p.Y;
        input[2] = s;

        bool success;

        // solium-disable-next-line security/no-inline-assembly
        assembly {
            success := staticcall(sub(gas(), 2000), 7, input, 0x80, r, 0x60)
        }

        if (!success) {
            revert Semaphore__InvalidProof();
        }
    }

    /// Asserts the pairing check
    /// e(p1[0], p2[0]) *  .... * e(p1[n], p2[n]) == 1
    /// For example pairing([P1(), P1().negate()], [P2(), P2()]) should succeed
    function pairingCheck(G1Point[] memory p1, G2Point[] memory p2) public view {
        // By EIP-197 all input is verified to be less than the BASE_MODULUS and form elements in their
        // respective groups of the right order.
        if (p1.length != p2.length) {
            revert Semaphore__InvalidProof();
        }

        uint256 elements = p1.length;
        uint256 inputSize = elements * 6;
        uint256[] memory input = new uint256[](inputSize);

        for (uint256 i = 0; i < elements; i++) {
            input[i * 6 + 0] = p1[i].X;
            input[i * 6 + 1] = p1[i].Y;
            input[i * 6 + 2] = p2[i].X[0];
            input[i * 6 + 3] = p2[i].X[1];
            input[i * 6 + 4] = p2[i].Y[0];
            input[i * 6 + 5] = p2[i].Y[1];
        }

        uint256[1] memory out;
        bool success;

        // solium-disable-next-line security/no-inline-assembly
        assembly {
            success := staticcall(sub(gas(), 2000), 8, add(input, 0x20), mul(inputSize, 0x20), out, 0x20)
        }

        if (!success || out[0] != 1) {
            revert Semaphore__InvalidProof();
        }
    }
}

Settings
{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

API
[{"inputs":[],"name":"Semaphore__InvalidProof","type":"error"},{"inputs":[],"name":"P1","outputs":[{"components":[{"internalType":"uint256","name":"X","type":"uint256"},{"internalType":"uint256","name":"Y","type":"uint256"}],"internalType":"struct Pairing.G1Point","name":"","type":"tuple"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"P2","outputs":[{"components":[{"internalType":"uint256[2]","name":"X","type":"uint256[2]"},{"internalType":"uint256[2]","name":"Y","type":"uint256[2]"}],"internalType":"struct Pairing.G2Point","name":"","type":"tuple"}],"stateMutability":"pure","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"X","type":"uint256"},{"internalType":"uint256","name":"Y","type":"uint256"}],"internalType":"struct Pairing.G1Point","name":"p1","type":"tuple"},{"components":[{"internalType":"uint256","name":"X","type":"uint256"},{"internalType":"uint256","name":"Y","type":"uint256"}],"internalType":"struct Pairing.G1Point","name":"p2","type":"tuple"}],"name":"addition","outputs":[{"components":[{"internalType":"uint256","name":"X","type":"uint256"},{"internalType":"uint256","name":"Y","type":"uint256"}],"internalType":"struct Pairing.G1Point","name":"r","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"X","type":"uint256"},{"internalType":"uint256","name":"Y","type":"uint256"}],"internalType":"struct Pairing.G1Point","name":"p","type":"tuple"}],"name":"negate","outputs":[{"components":[{"internalType":"uint256","name":"X","type":"uint256"},{"internalType":"uint256","name":"Y","type":"uint256"}],"internalType":"struct Pairing.G1Point","name":"r","type":"tuple"}],"stateMutability":"pure","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"X","type":"uint256"},{"internalType":"uint256","name":"Y","type":"uint256"}],"internalType":"struct Pairing.G1Point[]","name":"p1","type":"tuple[]"},{"components":[{"internalType":"uint256[2]","name":"X","type":"uint256[2]"},{"internalType":"uint256[2]","name":"Y","type":"uint256[2]"}],"internalType":"struct Pairing.G2Point[]","name":"p2","type":"tuple[]"}],"name":"pairingCheck","outputs":[],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"X","type":"uint256"},{"internalType":"uint256","name":"Y","type":"uint256"}],"internalType":"struct Pairing.G1Point","name":"p","type":"tuple"},{"internalType":"uint256","name":"s","type":"uint256"}],"name":"scalar_mul","outputs":[{"components":[{"internalType":"uint256","name":"X","type":"uint256"},{"internalType":"uint256","name":"Y","type":"uint256"}],"internalType":"struct Pairing.G1Point","name":"r","type":"tuple"}],"stateMutability":"view","type":"function"}]

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.