@polygon-hermez/vm/dist/evm/precompiles/08-ecpairing.js

An Ethereum VM implementation

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const ethereumjs_util_1 = require("ethereumjs-util");
const evm_1 = require("../evm");
const assert = require('assert');
const bn128 = require('rustbn.js');
function default_1(opts) {
    assert(opts.data);
    const inputData = opts.data;
    // no need to care about non-divisible-by-192, because bn128.pairing will properly fail in that case
    const inputDataSize = Math.floor(inputData.length / 192);
    const gasUsed = new ethereumjs_util_1.BN(opts._common.param('gasPrices', 'ecPairing') +
        inputDataSize * opts._common.param('gasPrices', 'ecPairingWord'));
    if (opts.gasLimit.lt(gasUsed)) {
        return (0, evm_1.OOGResult)(opts.gasLimit);
    }
    const returnData = bn128.pairing(inputData);
    // Reduce counters
    opts._VM.vcm.computeFunctionCounters('preECPairing', { inputsCount: inputDataSize });
    // check ecpairing success or failure by comparing the output length
    if (returnData.length !== 32) {
        return (0, evm_1.OOGResult)(opts.gasLimit);
    }
    return {
        gasUsed,
        returnValue: returnData,
    };
}
exports.default = default_1;
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